Israel, Holger, Erben, Thomas, Reiprich, Thomas H., Vikhlinin, Alexey, Hildebrandt, Hendrik, Hudson, Daniel S., ...
The mass function of galaxy clusters at high redshifts is a particularly useful probe to learn about the history of structure formation and constrain cosmological parameters. We aim at deriving...
Hudson, Daniel S., Mittal, Rupal, Reiprich, Thomas H., Nulsen, Paul E. J., Andernach, Heinz, Sarazin, Craig L.
We use the largest complete sample of 64 galaxy clusters (HIghest X-ray FLUx Galaxy Cluster Sample) with available high-quality X-ray data from Chandra, and apply 16 cool-core diagnostics to them,...
Wong, Ka-Wah, Sarazin, Craig L.
(abridged) We have studied the effects of electron-ion non-equipartition in the outer regions of relaxed clusters for a wide range of masses in the \LambdaCDM cosmology using one-dimensional...
X-ray Substructure Studies of Four Galaxy Clusters using XMM-Newton Data (2009)
Zhang, Yu-Ying, Reiprich, Thomas H, Finoguenov, Alexis, Hudson, Daniel S., Sarazin, Craig L
Mahdavi et al. find that the degree of agreement between weak lensing and X-ray mass measurements is a function of cluster radius. Numerical simulations also point out that X-ray mass proxies do not...
A Suzaku Search for Non-thermal Emission at Hard X-ray Energies in the Coma Cluster (2009)
Wik, Daniel R., Sarazin, Craig L., Finoguenov, Alexis, Matsushita, Kyoko, Nakazawa, Kazuhiro, Clarke, Tracy E.
The brightest cluster radio halo known resides in the Coma cluster of galaxies. The relativistic electrons producing this diffuse synchrotron emission should also produce inverse Compton emission...
A Suzaku search for nonthermal emission at hard X-ray energies in the coma cluster (2009)
Wik, Daniel R., Sarazin, Craig L., Finoguenov, Alexis, Matsushita, Kyoko, Nakazawa, Kazuhiro, Clarke, Tracy E.
Hard X-ray properties of the merging cluster Abell 3667 as observed with Suzaku (2009)
Nakazawa, Kazuhiro, Sarazin, Craig L., Kawaharada, Madoka, Kitaguchi, Takao, Okuyama, Sho, Makishima, Kazuo, ...
X-Ray substructure studies of four galaxy clusters using XMM-Newton data (2009)
Zhang, Yu-Ying, Reiprich, Thomas H., Finoguenov, Alexis, Hudson, Daniel S., Sarazin, Craig L.
Luminosity functions of LMXBs in Centaurus A: globular clusters versus the field (2009)
Voss, Rasmus, Gilfanov, Marat, Sivakoff, Gregory R., Kraft, Ralph P., Jordan, Andres, Raychaudhury, Somak, ...
Hard X-ray Properties of the Merging Cluster Abell 3667 as Observed with Suzaku (2008)
Nakazawa, Kazuhiro, Sarazin, Craig L., Kawaharada, Madoka, Kitaguchi, Takao, Okuyama, Sho, Makishima, Kazuo, ...
Wide-band Suzaku data on the merging cluster Abell 3667 were examined for hard X-ray emission in excess to the known thermal component. Suzaku detected X-ray signals in the wide energy band from 0.5...
Suzaku Observation of the Ophiuchus Galaxy Cluster: One of the Hottest Cool Core Clusters (2008)
Fujita, Yutaka, Hayashida, Kiyoshi, Nagai, Masaaki, Inoue, Susumu, Matsumoto, Hironori, Okabe, Nobuhiro, ...
We present the analysis of a Suzaku observation of the Ophiuchus galaxy cluster. We confirmed that the cluster has a cool core. While the temperature of the intracluster medium (ICM) decreases toward...
Sivakoff, Gregory R., Jordán, Andrés, Juett, Adrienne M., Sarazin, Craig L., Irwin, Jimmy A.
Chandra X-ray observations routinely resolve tens to hundreds of low-mass X-ray binaries (LMXBs) per galaxy in nearby massive early-type galaxies. These studies have raised important issues regarding...
Sivakoff, Gregory R., Jord'an, Andrés, Juett, Adrienne M., Sarazin, Craig L., Irwin, Jimmy A.
Multi-epoch Chandra X-ray observations of nearby massive early-type galaxies open up the study of an important regime of low-mass X-ray binary (LMXB) behavior -- long term variability. In a companion...
Wong, Ka-Wah, Sarazin, Craig L., Blanton, Elizabeth L., Reiprich, Thomas H.
We present a detailed analysis of the XMM-Newton and Chandra observations of Abell 2626 focused on the X-ray and radio interactions. Within the region of the radio mini-halo (~70 kpc), there are...
O'Dea, Christopher P., Baum, Stefi A., Privon, George, Noel-Storr, Jacob, Quillen, Alice C., Zufelt, Nicholas, ...
Quillen et al.(2007) presented an imaging survey with the {\it Spitzer Space Telescope} of 62 brightest cluster galaxies with optical line emission located in the cores of X-ray luminous clusters....
A Transient Black-Hole Low-Mass X-Ray Binary Candidate in Centaurus A (2008)
Sivakoff, Gregory R., Kraft, Ralph P., Jordán, Andrés, Juett, Adrienne M., Evans, Daniel A., Forman, William R., ...
We report the discovery of a bright transient X-ray source, CXOU J132518.2-430304, towards Centaurus A (Cen A) using six new Chandra X-Ray Observatory observations in 2007 March--May. Between 2003...
Wik, Daniel R., Sarazin, Craig L., Ricker, Paul M., Randall, Scott W.
Sensitive surveys of the Cosmic Microwave Background will detect thousands of galaxy clusters via the Sunyaev-Zel'dovich (SZ) effect. Two SZ observables, the central or maximum and integrated...
Ka-wah Wong, Craig L. Sarazin, Elizabeth L. Blanton, Thomas H. Reiprich
We present a detailed analysis of the XMM-Newton and Chandra observations of Abell 2626 focused on the X-ray and radio interactions. Within the region of the radio mini-halo ( ∼ 70 kpc), there are...
2 European Southern Observatory, Karl-Schwarzschild-Str. 2 (2008)
G. Fabbiano, Gregory R. Sivakoff, Andrés Jordán, Adrienne M. Juett, Craig L. Sarazin, ...
Abstract. Chandra observations of early-type galaxies have resolved large populations of lowmass X-ray binaries (LMXBs) in early-type galaxies. The majority of these observations have been snapshots...
Christopher P. O’dea, Stefi A. Baum, George Privon, Jacob Noel-storr, Alice C. Quillen, Nicholas Zufelt, ...
Quillen et al.(2007) reported on an imaging survey with the Spitzer Space Telescope of 62 brightest cluster galaxies with optical line emission located in the cores of X-ray luminous clusters...
The relative role of the formation of Low Mass X-ray Binaries (LMXBs) in globular clusters (GCs) and in situ formation in the field is uncertain. Simple models for the radial distribution of LMXBs in...
Low Mass X-ray Binaries and Globular Clusters in Early-Type Galaxies (2008)
Abstract. Chandra observations have allowed the detection of a large number of low mass Xray binaries (LMXBs) in early-type galaxies. Comparison to catalogs of globular clusters (GCs) from Hubble...
Gas Dynamics in Clusters (2008)
One of the more surprising results from X-ray astronomy is that the great volumes of space between galaxies in clusters of galaxies are not empty, as they appear in optical images. Instead, they are...
Studying the Nature of Dark Energy with Galaxy Clusters (2008)
Thomas H. Reiprich, Daniel S. Hudson, Thomas Erben, Craig L. Sarazin
Summary. We report on the status of our effort to constrain the nature of dark energy through the evolution of the cluster mass function. Chandra temperature profiles for 31 clusters from a local...
Chandra Observations of the Central Region of Abell 3112 (2008)
Motokazu Takizawa Craig, Craig L. Sarazin, Greg B. Taylor
We present the results of a Chandra observation of the central region of Abell 3112. This cluster has a powerful radio source in the center and was believed to have a strong cooling ow. The X-ray...
Astrophysical Journal, submitted Low Mass X-ray Binaries Versus Globular Cluster Age in the (2008)
Elliptical Galaxy Ngc, Craig L. Sarazin, Lorella Angelini, Gregory R. Sivako
Recently, Puzia et al. found that the Virgo elliptical galaxy NGC 4365 contains two systems of globular clusters (GCs): an old population (14 Gyr) and an intermediate-age population (3.5 Gyr). A...
Variable Low-Mass X-ray Binaries in Early-Type Galaxies (2007)
Sivakoff, Gregory R., Jordán, Andrés, Juett, Adrienne M., Sarazin, Craig L., Irwin, Jimmy A.
As the Chandra X-ray Observatory mission matures, increasing numbers of nearby galaxies are being observed multiple times, sampling the variability of extragalactic X-ray binaries on timescales...
Elizabeth L. Blanton, Craig L. Sarazin, Brian R. Mcnamara, Michael W. Wise
We present a Chandra observation of Abell 2052, a cooling flow cluster with a central cD that hosts the complex radio source 3C 317. The data reveal "holes " in the X-ray emission...
Submitted to the Astrophysical Journal (2007)
Jimmy A. Irwin, Craig L. Sarazin, Joel N. Bregman
We present a Chandra ACIS-S observation of the nearby bulge-dominated Sa galaxy NGC 1291. The X-ray emission from the bulge resembles the X-ray emission from a sub-class of elliptical and S0 galaxies...
Chapter 1 THE PHYSICS OF CLUSTER MERGERS (2007)
Abstract Clusters of galaxies generally form by the gravitational merger of smaller clusters and groups. Major cluster mergers are the most energetic events in the Universe since the Big Bang. Some...
Dynamics of the Multiple Merger Cluster of Galaxies (2007)
S. Vrtilek, E. M. Schlegel, L. Kuhi, Joshua C. Kempner, Craig L. Sarazin, Paul M. Ricker
Abstract. We present Cycle 1 Chandra observations of the Abell 85 cluster of galaxies. The cluster has a moderately strong cooling ow, but is in the early stages of a multiple merger with two smaller...
MERGER SHOCKS AND NONTHERMAL PROCESSES IN CLUSTERS OF GALAXIES (2007)
Clusters of galaxies generally form by the gravitational merger of smaller clusters and groups. Major cluster mergers are the most energetic events in the Universe since the Big Bang. Mergers drive...
MERGER SHOCKS AND NONTHERMAL PROCESSES IN CLUSTERS OF GALAXIES (2007)
Clusters of galaxies generally form by the gravitational merger of smaller clusters and groups. Major cluster mergers are the most energetic events in the Universe since the Big Bang. Mergers drive...
DIFFUSE GAS AND LMXBS IN THE CHANDRA OBSERVATION OF THE S0 GALAXY NGC 1553 (2007)
Elizabeth L. Blanton, Craig L. Sarazin, Jimmy A. Irwin
We have spatially and spectrally resolved the sources of X-ray emission from the X-ray faint S0 galaxy NGC 1553 using an observation from the Chandra X-ray Observatory. The majority (70%) of the...
Michael W. Wise, Craig L. Sarazin
We have calculated the emergent X--ray properties for models of cluster cooling flows including the effects of accumulated cooled material. The opacity of this cooled gas can reduce the overall...
High Mass X-ray Binary Modeling: The Magellanic Cloud Populations (2007)
William W. Dalton, Craig L. Sarazin
We construct models for the population of high mass X-ray binaries (HMXRBs) in the Large Magellanic Cloud (LMC) and Small Magellanic Cloud (SMC). In particular, we investigate the effect which the...
THE X-RAYFAINT EARLY-TYPE GALAXY NGC 4697 (2007)
Jimmy A. Irwin, Craig L. Sarazin, Joel N. Bregman
We analyze archival ROSAT HRI, ROSAT PSPC, and ASCA data of the X-rayfaint early-type galaxy NGC 4697. The joint ROSAT PSPC]ASCA spectrum is tted by a two-component thermal model, a MEKAL model with...
Craig L. Sarazin, Jimmy A. Irwin, Joel N. Bregman
Chandra observations of the X-ray--faint elliptical galaxy NGC 4697 resolve much of the X-ray emission (61 % within one effective radius) into #80 point sources, of which most are low-mass X-ray...
Craig L. Sarazin, Jimmy A. Irwin, Joel N. Bregman
A Chandra ACIS S3 observation of the X-ray faint elliptical galaxy NGC 4697 resolves much of the X-ray emission (61 % of the counts from within one effective radius) into 90 point sources, of which...
Thermal and Nonthermal Effects of Merger Shocks in Clusters of Galaxies (2007)
Abstract. Cluster mergers drive shocks into the intracluster medium which heat and compress the thermal gas. X-ray observations of shocks can be used to determine the geometry and kinematics of the...
SHOCKS AND NONTHERMAL PROCESSES IN CLUSTERS (2007)
Clusters of galaxies generally form by the gravitational merger of smaller clusters and groups. Major cluster mergers are the most energetic events in the Universe since the Big Bang. Mergers drive...
Cosmic Structure Traced by Precision (2007)
Measurements Of The, Thomas H. Reiprich, Craig L. Sarazin, Joshua C. Kempner, Michael F, Gregory R. Sivakoff, ...
The current status of our efforts to trace cosmic structure with 10 6 galaxies (2MASS), 10 3 galaxy clusters (NORAS II cluster survey), and precision measurements for 10 galaxy clusters (HIFLUGCS) is...
Noam Soker Elizabeth, Craig L. Sarazin
We study the possibility that a large fraction of the gas at temperatures of K in cooling flow clusters cools by heat conduction to lower temperatures, rather than by radiative cooling. We argue that...
Chandra Observation Of The Cooling Flow Cluster Abell 2052 (2007)
Elizabeth Blanton Craig, Craig L. Sarazin, Brian R. Mcnamara
We present an analysis of the Chandra X-ray observation of A2052, including large-scale properties of the cluster as well as the central region, which includes the bright radio source 3C 317. We...
Low-Mass X-ray Binaries and Globular Clusters in Centaurus A (2007)
Jordan, Andres, Sivakoff, Gregory R., McLaughlin, Dean E., Blakeslee, John P., Evans, Daniel A., Kraft, Ralph P., ...
We present results of Hubble Space Telescope and Chandra X-ray Observatory observations of globular clusters (GCs) and low-mass X-ray binaries (LMXBs) in the central regions of Centaurus A. Out of...
An infrared survey of brightest cluster galaxies: Paper I (2007)
Quillen, Alice C., Zufelt, Nicholas, Park, Jaehong, O'Dea, Christopher P., Baum, Stefi A., Privon, George, ...
We report on an imaging survey with the Spitzer Space Telescope of 62 brightest cluster galaxies with optical line emission. These galaxies are located in the cores of X-ray luminous clusters...
A Chandra Observation of Abell 13: Investigating the Origin of the Radio Relic (2007)
Juett, Adrienne M., Sarazin, Craig L., Clarke, Tracy E., Andernach, Heinz, Ehle, Matthias, Fujita, Yutaka, ...
We present results from the Chandra X-ray observation of Abell 13, a galaxy cluster that contains an unusual noncentral radio source, also known as a radio relic. This is the first pointed X-ray...
Chandra Observation of the Cluster Environment of a WAT Radio Source in Abell 1446 (2007)
Douglass, E. M., Blanton, Elizabeth L., Clarke, T. E., Sarazin, Craig L., Wise, Michael
Wide-angle tail (WAT) radio sources are often found in the centers of galaxy clusters where intracluster medium (ICM) ram pressure may bend the lobes into their characteristic C-shape. We examine the...
Sivakoff, Gregory R., Jordán, Andrés, Sarazin, Craig L., Blakeslee, John P., E}, Patrick C{\^ O}t{\', Ferrarese, Laura, ...
(Abridged) Chandra and Hubble ACS observations of 11 early-type galaxies probe the low-mass X-ray binary (LMXB) - globular cluster (GC) connection. We explore the optical properties of 270 GCs with...
Chandra Observation of the Interaction of the Radio Source and Cooling Core in Abell 2063 (2006)
Kanov, Kalin N., Sarazin, Craig L., Hicks, Amalia K.
We present the results of a Chandra observation of the cooling core cluster Abell 2063. Spectral analysis shows that there is cool gas (2 keV) associated with the cluster core, which is more than a...
X-ray Detection of the Proto Supermassive Binary Black Hole at the Centre of Abell 400 (2006)
Hudson, Daniel S., Reiprich, Thomas H., Clarke, Tracy E., Sarazin, Craig L.
We report the first X-ray detection of a proto-supermassive binary black hole at the centre of Abell 400. Using the Chandra ACIS, we are able to clearly resolve the two active galactic nuclei in 3C...
Studying the Nature of Dark Energy with Galaxy Clusters (2006)
Reiprich, Thomas H., Hudson, Daniel S., Erben, Thomas, Sarazin, Craig L.
We report on the status of our effort to constrain the nature of dark energy through the evolution of the cluster mass function. Chandra temperature profiles for 31 clusters from a local cluster...
Chandra Observation of Abell 2065: An Unequal Mass Merger? (2006)
Chatzikos, Marios, Sarazin, Craig L., Kempner, Joshua C.
We present an analysis of a 41 ks Chandra observation of the merging cluster Abell 2065 with the ACIS-I detector. Previous observations with ROSAT and ASCA provided evidence for an ongoing merger,...
Gregory R. Sivakoff, Andrés Jordán, Craig L. Sarazin, John P. Blakeslee, Patrick Côté, Laura Ferrarese, ...
LMXBs form efficiently in GCs. By combining Chandra and HST ACS observations of 11 massive early-type galaxies in the Virgo Cluster, we use the most accurate identification of LMXBs and GCs to date...
CHANDRA OBSERVATION OF THE INTERACTION OF THE RADIO SOURCE AND COOLING CORE IN ABELL 2063 (2006)
Kalin N. Kanov, Craig L. Sarazin, Amalia K. Hicks
We present the results of a Chandra observation of the cooling core cluster Abell 2063. Spectral analysis shows that there is cool gas (2 keV) associated with the cluster core, which is more than a...
Fujita, Yutaka, Sarazin, Craig L., Sivakoff, Gregory R.
We present an analysis of Chandra observations of the galaxy clusters A2670 and A2107. Their cD galaxies have large peculiar velocities (>200km/s) and thus the clusters appear to be undergoing...
XMM-Newton Observation of Diffuse Gas and LMXBs in the Elliptical Galaxy NGC 4649 (M60) (2005)
Randall, Scott W., Sarazin, Craig L., Irwin, Jimmy A.
(Abridged) We present an XMM-Newton X-ray observation of the X-ray bright E2 elliptical galaxy NGC 4649. In addition to bright diffuse emission, we resolve 158 discrete sources, ~50 of which are...
Jordan, Andres, Cote, Patrick, Blakeslee, John P., Ferrarese, Laura, McLaughlin, Dean E., Mei, Simona, ...
We have measured half-light radii, r_h, for globular clusters (GCs) belonging to the 100 early-type galaxies observed in the ACS Virgo Cluster Survey and the elliptical galaxy NGC 4697. An analysis...
Luminous X-ray Flares from Low Mass X-ray Binary Candidates in the Early-Type Galaxy NGC 4697 (2005)
Sivakoff, Gregory R., Sarazin, Craig L., Jordan, Andres
We report results of the first search specifically targeting short-timescale X-ray flares from low-mass X-ray binaries in an early-type galaxy. A new method for flare detection is presented. In NGC...
Pfrommer, Christoph, Ensslin, Torsten A., Sarazin, Craig L.
The Chandra X-ray Observatory is finding a large number of cavities in the X-ray emitting intra-cluster medium which often coincide with the lobes of the central radio galaxy. We propose...
Sivakoff, Gregory R., Sarazin, Craig L., Carlin, Jeffrey L.
(Abridged) We observed the X-ray bright E3 galaxy NGC 1600 and nearby group members with the Chandra X-ray Observatory ACIS S3. Unresolved emission dominates the observation; however, we resolved...
The Complex Cooling Core of Abell 2029: Radio and X-ray Interactions (2004)
Clarke, Tracy E., Blanton, Elizabeth L., Sarazin, Craig L.
We present an analysis of Chandra observations of the central regions of the cooling flow cluster Abell 2029. We find a number of X-ray filaments in the central 40 kpc, some of which appear to be...
XMM-Newton Observations of A133: A Weak Shock Passing through the Cool Core (2004)
Fujita, Yutaka, Sarazin, Craig L., Reiprich, Thomas H., Andernach, H., Ehle, M., Murgia, M., ...
We use XMM-Newton observations of the cluster of galaxies A133 to study the X-ray spectrum of the intracluster medium (ICM). We find a cold front to the southeast of the cluster core. From the...
Mergers and Non-Thermal Processes in Clusters of Galaxies (2004)
Clusters of galaxies generally form by the gravitational merger of smaller clusters and groups. Major cluster mergers are the most energetic events in the Universe since the Big Bang. The basic...
Outstanding Questions about Mergers in Clusters of Galaxies (2004)
At the request of the organizers of the Santa Fe meeting on X-Ray and Radio Connections, I list some important questions and lines of inquiry for the future study of the X-ray and radio connections...
Blanton, Elizabeth L., Sarazin, Craig L., McNamara, Brian R., Clarke, T. E.
We present a Chandra observation of the cooling flow cluster Abell 262. Spectral fits show that the intracluster medium (ICM) in A262 cools by a factor of three from 2.7 keV to 0.9 keV at the cluster...
Scott W. R, Craig L. Sarazin, Jimmy A. Irwin
We present an XMM-Newton X-ray observation of the X-ray–bright E2 elliptical galaxy NGC 4649. In addition to bright diffuse emission, we resolve 158 discrete sources, 50 of which are likely to be...
Mergers and Non-Thermal Processes in Clusters (2003)
Clusters of galaxies generally form by the gravitational merger of smaller clusters and groups. Mergers drive shocks in the intracluster gas which heat the intracluster gas. Mergers disrupt cluster...
Cooling of X-ray Emitting Gas by Heat Conduction in the Center of Cooling Flow Clusters (2003)
Soker, Noam, Blanton, Elizabeth L., Sarazin, Craig L.
We study the possibility that a large fraction of the gas at temperatures of \~10^7 K in cooling flow clusters cools by heat conduction to lower temperatures, rather than by radiative cooling. We...
Sivakoff, Gregory R., Sarazin, Craig L., Irwin, Jimmy A.
(Abridged) We used the Chandra X-ray Observatory ACIS S3 to image the X-ray faint elliptical galaxy NGC 4365 and lenticular galaxy NGC 4382. The observations resolve much of the X-ray emission into...
XMM-Newton Observation of the Merging Galaxy Cluster A1644 (2003)
Reiprich, Thomas H., Sarazin, Craig L., Kempner, Joshua C., Tittley, Eric
An XMM-Newton imaging spectroscopy analysis of the galaxy cluster A1644 is presented. A1644 is a complex merging system consisting of a main and a sub cluster. A trail of cool, metal-rich gas has...
Low Mass X-ray Binaries and Globular Clusters in Early-Type Galaxies (2003)
Sarazin, Craig L., Kundu, Arunav, Irwin, Jimmy A., Sivakoff, Gregory R., Blanton, Elizabeth L., Randall, Scott W.
(Abridged) A high fraction of the Low Mass X-ray Binaries (LMXBs) in early-type galaxies are associated with globular clusters (GCs). Here, we discuss the correlations between LMXBs and GCs in a...
Chandra Observations of the Central Region of Abell 3112 (2003)
Takizawa, Motokazu, Sarazin, Craig L., Blanton, Elizabeth L., Taylor, Greg B.
We present the results of a {\it Chandra} observation of the central region of Abell 3112. This cluster has a powerful radio source in the center and was believed to have a strong cooling flow. The...
Hot plasma in clusters of galaxies, the largest objects in the universe (2003)
Clusters of galaxies are the largest organized structures in the Universe. They are important cosmological probes, since they are large enough to contain a fair sample of the materials in the...
Reiprich, Thomas H., Sarazin, Craig L., Kempner, Joshua C., Skrutskie, Michael F., Sivakoff, Gregory R., Boehringer, Hans, ...
The current status of our efforts to trace cosmic structure with 10^6 galaxies (2MASS), 10^3 galaxy clusters (NORAS II cluster survey), and precision measurements for 10^2 galaxy clusters (HIFLUGCS)...
Chandra Observation of the Cooling Flow Cluster Abell 2052 (2002)
Blanton, Elizabeth L., Sarazin, Craig L., McNamara, Brian R.
We present an analysis of the Chandra X-ray observation of Abell 2052, including large scale properties of the cluster as well as the central region which includes the bright radio source, 3C 317. We...
Nonthermal Emissions from Particles Accelerated by Turbulence in Clusters of Galaxies (2002)
Fujita, Yutaka, Takizawa, Motokazu, Sarazin, Craig L.
We consider nonthermal emission from clusters of galaxies produced by particle acceleration by resonant scattering of Alfv\'{e}n waves driven by fluid turbulence through the Lighthill mechanism in...
Randall, Scott W., Sarazin, Craig L., Ricker, Paul M.
In the standard Cold Dark Matter model of structure formation, massive clusters form via the merger of smaller clusters. N-body/hydrodynamical simulations of merging galaxy clusters have shown that...
Fujita, Yutaka, Sarazin, Craig L., Nagashima, Masahiro, Yano, Taihei
We construct an analytical model of the mass distribution function of subhalos in a galaxy cluster in the context of the cold dark matter (CDM) theory. Our model takes account of two important...
X-ray Binaries and Globular Clusters in Elliptical Galaxies (2002)
White III, Raymond E., Sarazin, Craig L., Kulkarni, Shrinivas R.
The X-ray emission from normal elliptical galaxies has two major components: soft emission from diffuse gas and harder emission from populations of accreting (low-mass) stellar X-ray binaries (LMXB)....
Chandra Observations of the Disruption of the Cool Core in Abell 133 (2002)
Fujita, Yutaka, Sarazin, Craig L., Kempner, Joshua C., Rudnick, L., A, O. B. Slee, Roy, . L., ...
We present the analysis of a Chandra observation of the galaxy cluster Abell 133, which has a cooling flow core, a central radio source, and a diffuse, filamentary radio source which has been...
Hot Bubbles in Cooling Flow Clusters (2002)
Soker, Noam, Blanton, Elizabeth L., Sarazin, Craig L.
As more cooling flow clusters of galaxies with central radio sources are observed with the Chandra and XMM-Newton X-ray Observatories, more examples of "bubbles" (low-emission regions in the X-ray...
Nonthermal Emissions From Particles Accelerated By Turbulence (2002)
In Clusters Of, Yutaka Fujita, Craig L. Sarazin
We consider nonthermal emission from clusters of galaxies produced by particle acceleration by resonant scattering of Alfve n waves driven by fluid turbulence through the Lighthill mechanism in the...
Nonthermal Emission from Accreting and Merging Clusters of Galaxies (2001)
Fujita, Yutaka, Sarazin, Craig L.
We compare the nonthermal emission from clusters of galaxies undergoing minor mergers (``accreting'' clusters) and major mergers (``merging'' clusters). For accreting clusters, the radial...
Untangling the X-ray Emission From the Sa Galaxy NGC1291 With Chandra (2001)
Irwin, Jimmy A., Sarazin, Craig L., Bregman, Joel N.
We present a Chandra ACIS-S observation of the nearby bulge-dominated Sa galaxy NGC1291. The X-ray emission from the bulge resembles the X-ray emission from a sub-class of elliptical and S0 galaxies...
Blanton, Elizabeth L., Sarazin, Craig L., McNamara, Brian R., Wise, Michael W.
We present a Chandra observation of Abell 2052, a cooling flow cluster with a central cD that hosts the complex radio source 3C 317. The data reveal ``holes'' in the X-ray emission that are...
Off-Axis Cluster Mergers: Effects of a Strongly Peaked Dark Matter Profile (2001)
Ricker, Paul M., Sarazin, Craig L.
(Abridged) We present a parameter study of offset mergers between clusters of galaxies. Using the Eulerian hydrodynamics/N-body code COSMOS, we simulate mergers between nonisothermal, hydrostatic...
Merger Shocks and Nonthermal Processes in Clusters of Galaxies (2001)
Clusters of galaxies generally form by the gravitational merger of smaller clusters and groups. Major cluster mergers are the most energetic events in the Universe since the Big Bang. Mergers drive...
The Physics of Cluster Mergers (2001)
Clusters of galaxies generally form by the gravitational merger of smaller clusters and groups. Major cluster mergers are the most energetic events in the Universe since the Big Bang. Some of the...
Chandra X-ray Observations of the X-ray Faint Elliptical Galaxy NGC 4697 (2001)
Sarazin, Craig L., Irwin, Jimmy A., Bregman, Joel N.
(abridged) A Chandra ACIS S3 observation of the X-ray faint elliptical galaxy NGC 4697 resolves much of the X-ray emission (61% of the counts from within one effective radius) into 90 point sources,...
Radio Halo and Relic Candidates from the Westerbork Northern Sky Survey (2000)
Kempner, Joshua C., Sarazin, Craig L.
We have undertaken a systematic search for diffuse radio halos and relics in all of the Abell clusters that are visible in the Westerbork Northern Sky Survey (WENSS). In this survey we found 18...
The Contribution of EUV from Clusters of Galaxies to the Cosmic Ionizing Background (2000)
Randall, Scott W., Sarazin, Craig L.
Recent observations with the Extreme Ultraviolet Explorer (EUVE) suggest that at least some clusters of galaxies are luminous sources of extreme ultraviolet (EUV) radiation. It is not clear yet...
Sarazin, Craig L., Irwin, Jimmy A., Bregman, Joel N.
Chandra observations of the X-ray faint elliptical galaxy NGC 4697 resolve much of the X-ray emission (61% within one effective radius) into ~80 point sources, of which most are low mass X-ray...
Shocks and Nonthermal Processes in Clusters (2000)
Clusters of galaxies generally form by the gravitational merger of smaller clusters and groups. Major cluster mergers are the most energetic events in the Universe since the Big Bang. Mergers drive...
The X-ray Faint Early-Type Galaxy NGC4697 (2000)
Irwin, Jimmy A., Sarazin, Craig L., Bregman, Joel N.
We analyze archival ROSAT HRI, ROSAT PSPC, and ASCA data of the X-ray faint early-type galaxy NGC4697. The joint ROSAT PSPC + ASCA spectrum is fit by a two-component thermal model, a MEKAL model with...
Time-Dependence of the Mass Accretion Rate in Cluster Cooling Flows (2000)
Lufkin, Eric A., Sarazin, Craig L., White, Raymond E.
We analyze two time-dependent cluster cooling flow models in spherical symmetry. The first assumes that the intracluster gas resides in a static external potential, and includes the effects of...
Multiwavelength Observations of the Second Largest Known FR II Radio Galaxy, NVSS 2146+82 (2000)
Palma, Christopher, Bauer, Franz E., Cotton, William D., Bridle, Alan H., Majewski, Steven R., Sarazin, Craig L.
We present multi-frequency VLA, multicolor CCD imaging, optical spectroscopy, and ROSAT HRI observations of the giant FR II radio galaxy NVSS 2146+82. This galaxy, which was discovered by the NRAO...
Thermal and Nonthermal Effects of Merger Shocks in Clusters of Galaxies (1999)
Cluster mergers drive shocks into the intracluster medium which heat and compress the thermal gas. X-ray observations of shocks can be used to determine the geometry and kinematics of the merger....
Nonthermal Bremsstrahlung and Hard X-ray Emission from Clusters of Galaxies (1999)
Sarazin, Craig L., Kempner, Joshua C.
We have calculated nonthermal bremsstrahlung (NTB) models for the hard X-ray (HXR) tails recently observed by BeppoSAX in clusters of galaxies. In these models, the HXR emission is due to...
Limits on the Diffuse Radio and Hard X-ray Emission of Abell 2199 (1999)
Kempner, Joshua C., Sarazin, Craig L.
The Westerbork Northern Sky Survey (WENSS) and the NRAO/VLA Sky Survey (NVSS) were used to determine an upper limit to the diffuse radio flux from the nearby cluster Abell 2199. For the entire...
Models for the integrated relativistic electron population in clusters of galaxies are presented. The results depend on the history of electron acceleration in the cluster. If there is no present...
X-ray Absorption Due to Cold Gas in Cluster Cooling Cores (1999)
Wise, Michael W., Sarazin, Craig L.
We have calculated the emergent X-ray properties for models of cluster cooling flows including the effects of accumulated cooled material. The opacity of this cooled gas can reduce the overall X-ray...
ROSAT HRI X-ray Observations of the Open Globular Cluster NGC 288 (1999)
Sarazin, Craig L., Irwin, Jimmy A., Rood, Robert T., Ferraro, Francesco R., Paltrinieri, Barbara
A ROSAT HRI X-ray image was obtained of the open globular cluster NGC 288, which is located near the South Galactic Pole. This is the first deep X-ray image of this system. We detect a Low Luminosity...
Models for the evolution of the integrated energy spectrum of primary cosmic ray electrons in clusters of galaxies have been calculated, including the effects of losses due to inverse Compton (IC),...
McNamara, Brian R., Jannuzi, Buell T., Sarazin, Craig L., Elston, Richard, Wise, Michael
We have obtained U-band polarimetry of the spatially extended, blue optical continuum associated with the FR I radio source PKS 2322-122. PKS 2322-122 is located in the Abell 2597 cluster central...
ROSAT X-ray Colors and Emission Mechanisms in Early-Type Galaxies (1998)
Irwin, Jimmy A., Sarazin, Craig L.
The X-ray colors and X-ray-to-optical luminosity ratios (L_X/L_B) of 61 early- type galaxies observed with the ROSAT PSPC are determined. The colors indicate that the X-ray spectral properties of...
Excitation of the 3.071mm Hyperfine Line in Li-Like 57-Fe in Astrophysical Plasmas (1998)
D'Cruz, Noella L., Sarazin, Craig L., Dubau, Jacques
As noted first by Sunyaev & Churazov (1984), the 3.071 mm hyperfine line from $^{57}Fe^{+23}$ might be observable in astrophysical plasmas. We assess the atomic processes which might contribute to...
Irwin, Jimmy A., Sarazin, Craig L.
The X-ray emission from the faintest X-ray elliptical and S0 galaxies is characterized by a hard ~5 keV component, and a very soft ~0.2 keV component. The hard component has generally been regarded...
X-Ray Spectral Properties of the Cluster Abell 2029 (1997)
Sarazin, Craig L., Wise, Michael W., Markevitch, Maxim L.
We have analyzed ASCA and ROSAT PSPC spectra and images of the galaxy cluster Abell 2029. The ASCA spectra of the cluster indicate that the gas temperature declines with radius. The PSPC image shows...
Sarazin, Craig L., Lieu, Richard
We suggest that the luminous extreme ultraviolet (EUV) emission which has been detected recently from clusters of galaxies is Inverse Compton (IC) scattering of Cosmic Microwave Background (CMB)...
Cluster Cooling Flows: Recent Progress and Outstanding Questions (1996)
Recent results on cluster cooling flows are reviewed. Observations of excess soft X-ray provides the only direct evidence for a major repository for the cooled gas. Unfortunately, the frequency of...
X-ray Emission from Elliptical Galaxies (1996)
Elliptical galaxies are generally luminous sources of X-ray radiation, and contain large amounts of hot, interstellar gas. In the brighter X-ray galaxies, the inferred masses of hot gas are...
ROSAT X-ray Observations of the Cooling Flow Cluster A2597 (1996)
Sarazin, Craig L., McNamara, Brian R.
The cluster A2597 was observed in X-rays with the ROSAT PSPC and HRI detectors. The X-ray isophotes are oriented similarly to the optical isophotes of the central cD galaxy and to the isopleths of...
High Resolution X-ray Spectra of Cluster Cooling Flows (1996)
The cooling cores of clusters of galaxies are among the brightest thermal X-ray line sources in the universe. High resolution X-ray spectra would allow individual line fluxes to be measured. The...
Noella L. D'cruz, Craig L. Sarazin, Jacques Dubau
As noted first by Sunyaev & Churazov (1984), the 3.071 mm hyperfine line from
An infrared survey of brightest cluster galaxies: Paper I
Alice C. Quillen, Nicholas Zufelt, Jaehong Park, Christopher P. O’dea, Stefi A. Baum, George Privon, ...
We report on an imaging survey with the Spitzer Space Telescope of 62 brightest cluster galaxies with optical line emission. These galaxies are located in the cores of X-ray luminous clusters...