The growth and evolution of super massive black holes (2009)
Murray, S., Gilli, R., Tozzi, P., Paolillo, M., Brandt, N., Tagliaferri, G., ...
We discuss the central role played by X-ray studies to reconstruct the past history of formation and evolution of supermassive Black Holes (BHs), and the role they played in shaping the properties of...
X-ray Cluster Cosmology (2009)
Vikhlinin, A., Murray, S., Gilli, R., Tozzi, P., Paolillo, M., Brandt, N., ...
Sensitive, wide-area X-ray surveys which would be possible with the WFXT will detect huge samples of virialized objects spanning the mass range from sub-groups to the most massive clusters, and...
Cosmic Feedback from Supermassive Black Holes (2009)
Fabian, A., Churazov, E., Donahue, M., Forman, W. R., Garcia, M. R., Heinz, S., ...
An extraordinary recent development in astrophysics was the discovery of the fossil relationship between central black hole mass and the stellar mass of galactic bulges. The physical process...
Cosmological Studies With A Large-Area X-ray Telescope (2009)
Vikhlinin, A., Allen, S. W., Arnaud, M., Bautz, M., Boehringer, H., Bonamente, M., ...
A moderate investment of observing time with the International X-ray Observatory to study high-redshift galaxy clusters detected in future large-scale surveys, will provide cosmological measurements...
Towards the 2020 vision of the baryon content of galaxy groups and clusters (2009)
Kravtsov, A., Gonzalez, A., Vikhlinin, A., Marrone, D., Zabludoff, A., Nagai, D., ...
Groups and clusters of galaxies occupy a special position in the hierarchy of large-scale cosmic structures because they are the largest and the most massive (from ~10^13 Msun to over 10^15 Msun)...
Galaxy clusters and the cosmic cycle of baryons across cosmic times (2009)
Giacconi, R., Borgani, S., Rosati, P., Tozzi, P., Gilli, R., Murray, S., ...
We discuss the central role played by the X-ray study of hot baryons within galaxy clusters to reconstruct the assembly of cosmic structures and to trace the past history of star formation and...
The Very Local Universe in X-rays (2009)
Ptak, A., Feigelson, E., Kuntz, K., Zezas, A., Snowden, S., ...
While the exceptional sensitivity of Chandra and XMM-Newton has resulted in revolutionary studies of the Galactic neighborhood in the soft ( 100 sq. deg.) X-ray surveys.
Diffuse baryonic matter beyond 2020 (2009)
Markevitch, M., Nicastro, F., Nulsen, P., Rasia, E., Vikhlinin, A., Kravtsov, A., ...
The hot, diffuse gas that fills the largest overdense structures in the Universe -- clusters of galaxies and a web of giant filaments connecting them -- provides us with tools to address a wide array...
Fossil Systems in the 400d Cluster Catalog (2009)
Voevodkin, A., Borozdin, K., Heitmann, K., Habib, S., Vikhlinin, A., Mescheryakov, A., ...
We report the discovery of seven new fossil systems in the 400d cluster survey. Our search targets nearby, $z\le0.2$, and X-ray bright, $L_X\ge 10^{43}$ erg sec$^{-1}$, clusters of galaxies. Where...
Chandra Cluster Cosmology Project III: Cosmological Parameter Constraints (2008)
Vikhlinin, A., Kravtsov, A. V., Burenin, R. A., Ebeling, H., Forman, W. R., Hornstrup, A., ...
Chandra observations of large samples of galaxy clusters detected in X-rays by ROSAT provide a new, robust determination of the cluster mass functions at low and high redshifts. Statistical and...
A Full Year's Chandra Exposure on SDSS Quasars from the Chandra Multiwavelength Project (2008)
Green, Paul J., Aldcroft, T. L., Richards, G. T., Barkhouse, W. A., Constantin, A., Haggard, D., ...
We study the spectral energy distributions and evolution of a large sample of optically selected quasars from the Sloan Digital Sky Survey (SDSS) that were observed in 323 Chandra images analyzed by...
In-depth Chandra study of the AGN feedback in Virgo elliptical galaxy M84 (2008)
Finoguenov, A., Ruszkowski, M., Jones, C., Brueggen, M., Vikhlinin, A., Mandel, E.
Using deep Chandra observations of M84 we study the energetics of the interaction between the black hole and the interstellar medium of this early-type galaxy. We perform a detailed two dimensional...
Chandra Cluster Cosmology Project II: Samples and X-ray Data Reduction (2008)
Vikhlinin, A., Burenin, R. A., Ebeling, H., Forman, W. R., Hornstrup, A., Jones, C., ...
We discuss the measurements of the galaxy cluster mass functions at z=~0.05 and z=~0.5 using high-quality Chandra observations of samples derived from the ROSAT PSPC All-Sky and 400deg^2 surveys. We...
Chandra studies of the X-ray gas properties of galaxy groups (2008)
Sun, M., Voit, G. M., Donahue, M., Jones, C., Forman, W., Vikhlinin, A.
We present a systematic analysis of 43 galaxy groups (kT_500=0.7-2.7 keV or M_500=10^13-10^14 h^-1 M_solar, 0.0120.15 r_500 and are consistent with a "universal temperature profile". We present the...
Lutovinov, A. A., Vikhlinin, A., Churazov, E. M., Revnivtsev, M. G., Sunyaev, R. A.
We present results of X-ray observations of the Coma cluster with multiple instruments over a broad energy band. Using the data from INTEGRAL, RXTE and ROSAT observatories, we find that the Coma...
Dynamics of the hot intracluster medium (2008)
Jones, C., Forman, W., Vikhlinin, A., Markevitch, M., Machacek, M., Churazov, E.
Spectrum-Roentgen-Gamma astrophysical mission (2008)
Pavlinsky, M., Sunyaev, R., Churazov, E., Gilfanov, M., Vikhlinin, A., Hasinger, G., ...
In-depth Chandra study of the AGN feedback in Virgo elliptical galaxy M84 (2008)
Finoguenov, A., Ruszkowski, M., Jones, C., Brüggen, M., Vikhlinin, A., Mandel, E.
Churazov, E., Forman, W., Vikhlinin, A., Tremaine, S., Gerhard, O., Jones, C.
We compare the gravitational potential profiles of the elliptical galaxies NGC 4486 (M87) and NGC 1399 (the central galaxy in the Fornax cluster) derived from X-ray and optical data. This comparison...
S. Kuznetsov, M. Gilfanov, E. Churazov, R. Sunyaev, A. Vikhlinin, A. Dyachkov, ...
Abstract. The entire dataset of the GRANAT/SIGMA
B. J. Wilkes, P. Green, R. Brissenden, R. Cameron, A. Dobrzycki, N. Evans, ...
opened a new era in X-ray astronomy. Its unprecedented, ! 0:5 " spatial resolution and low background are providing views of the X-ray sky 10-100 times fainter than previously possible. We...
On the width of cold fronts in clusters of galaxies due to conduction (2007)
Xiang, F., Churazov, E., Dolag, K., Springel, V., Vikhlinin, A.
We consider the impact of thermal conduction in clusters of galaxies on the (unmagnetized) interface between a cold gaseous cloud and a hotter gas flowing over the cloud (the so-called cold front)....
Boehringer, H., Schuecker, P., Pratt, G. W., Arnaud, M., Ponman, T. J., Croston, J. H., ...
The largest uncertainty for cosmological studies using clusters of galaxies is introduced by our limited knowledge of the statistics of galaxy cluster structure, and of the scaling relations between...
On the width of cold fronts in clusters of galaxies due to conduction (2007)
Xiang, F., Churazov, E., Dolag, K., Springel, V., Vikhlinin, A.
Filaments, bubbles and weak shocks in the gaseous atmosphere of M87 (2007)
Forman, W., Jones, C., Churazov, E., Markevitch, M., Nulsen, P., Vikhlinin, A., ...
Outbursts from supermassive black holes: shocks, bubbles and filaments around M87 (2007)
Forman, W., Churazov, E., Jones, C., Nulsen, P., Kraft, R., Böhringer, H., ...
Hard X-ray telescope concentrator for astrophysical mission Spectrum-X-Gamma (2007)
Pavlinisky, M., Arefiev, V., Churazov, E., Gilfanov, M., Grigorovich, S., Litvin, D., ...
Resolving the Galactic X-ray background (2006)
Revnivtsev, M., Vikhlinin, A., Sazonov, S.
We use Chandra deep observations of the Galactic Center (GC) region to improve the constraints on the unresolved fraction of the Galactic X-ray background (also known as the Galactic ridge X-ray...
Lack of cooling flow clusters at z>0.5 (2006)
Vikhlinin, A., Burenin, R., Forman, W. R., Jones, C., Hornstrup, A., Murray, S. S., ...
The goal of this work is to study the incidence rate of "cooling flows" in the high redshift clusters using Chandra observations of z>0.5 objects from a new large, X-ray selected catalog. We find...
The 400 square degrees ROSAT PSPC galaxy cluster survey: Catalog and statistical calibration (2006)
Burenin, R. A., Vikhlinin, A., Hornstrup, A., Ebeling, H., Quintana, H., Mescheryakov, A.
We present a catalog of galaxy clusters detected in a new ROSAT PSPC survey. The survey is optimized to sample, at high redshifts, the mass range corresponding to T> keV clusters at z=0. Technically,...
X-ray thermal coronae of galaxies in hot clusters -- ubiquity of embedded mini cooling cores (2006)
Sun, M., Jones, C., Forman, W., Vikhlinin, A., Donahue, M., Voit, M.
We present a systematic investigation of X-ray thermal coronae in 157 early-type galaxies and 22 late-type galaxies from a survey of 25 hot (kT>3 keV), nearby (z60% in NIR selected galaxies that are...
Filaments, Bubbles, and Weak Shocks in the Gaseous Atmosphere of M87 (2006)
Forman, W., Churazov, E., Jones, C., Markevitch, M., Nulsen, P., Vikhlinin, A., ...
We present the first results from a 500 ksec Chandra ACIS-I observation of M87. At soft energies (0.5-1.0 keV), we detect filamentary structures associated with the eastern and southwestern X-ray and...
ChaMP Serendipitous Galaxy Cluster Survey (2006)
Barkhouse, W. A., Green, P. J., Vikhlinin, A., Perley, D., Cameron, R., ...
We present a survey of serendipitous extended X-ray sources and optical cluster candidates from the Chandra Multi-wavelength Project (ChaMP). Our main goal is to make an unbiased comparison of X-ray...
Supersoft X-ray Sources. Parameters of Stellar Atmospheres (2006)
Ibragimov, A., Suleimanov, V., Vikhlinin, A., Sakhibullin, N.
ROSAT spectra of 11 supersoft X-ray sources (RX J0439.8-6809, RX J0513.9-6951, RX J0527.8-6954, CAL 87, CAL 83, 1E 0035.4-7230, RX J0048.4-7332, 1E 0056.8-7154, RX J0019.8 +2156, RX J0925.7-4758, AG...
ChaMP serendipitous galaxy cluster survey (2006)
Barkhouse, W. A., Green, P. J., Vikhlinin, A., Kim, D. W., Perley, D., Cameron, R., ...
Hard X-ray concentrator experiment for Spectrum-X-Gamma mission (2006)
Arefiev, V., Pavlinsky, M., Revnivtsev, M., Churazov, E., Gilfanov, M., Kumakhov, M., ...
Spectrum-RG/eROSITA/Lobster astrophysical mission (2006)
Pavlinsky, M., Hasinger, G., Parmar, A., Fraser, G., Churazov, E., Gilfanov, M., ...
Spectrum-RG/eROSITA/Lobster astrophysical mission (2006)
Pavlinsky, M., Hasinger, G., Parmar, A., Fraser, G., Churazov, E., Gilfanov, M., ...
Reflections of Active Galactic Nucleus Outbursts in the Gaseous Atmosphere of M87 (2005)
Forman, W., Nulsen, P., Heinz, S., Owen, F., Eilek, J., Vikhlinin, A., ...
We combined deep Chandra, ROSAT HRI, and XMM-Newton observations of M87 to study the impact of active galactic nucleus (AGN) outbursts on its gaseous atmosphere. Many X-ray features appear to be a...
Reflections of Active Galactic Nucleus Outbursts in the Gaseous Atmosphere of M87 (2005)
Forman, W., Nulsen, P., Heinz, S., Owen, F., Eilek, J., Vikhlinin, A., ...
We combined deep Chandra, ROSAT HRI, and XMM-Newton observations of M87 to study the impact of active galactic nucleus (AGN) outbursts on its gaseous atmosphere. Many X-ray features appear to be a...
Chandra Sample of Galaxy Clusters at z=0.4-0.55: Evolution in the Mass-Temperature Relation (2005)
We present spatially-resolved analysis of the temperature and gas density profiles in 6 relaxed galaxy clusters at z = 0.4-0.54 using long-exposure Chandra observations. We derived the total cluster...
Identification of 8 INTEGRAL hard X-ray sources with Chandra (2005)
Sazonov, S., Churazov, E., Revnivtsev, M., Vikhlinin, A., Sunyaev, R.
We report the results of identification of 8 hard X-ray sources discovered by the INTEGRAL observatory during the ongoing all-sky survey. These sources have been observed by Chandra. In 6 cases a...
Vikhlinin, A., Kravtsov, A., Forman, W., Jones, C., Markevitch, M., Murray, S. S., ...
We present gas and total mass profiles for 13 low-redshift, relaxed clusters spanning a temperature range 0.7-9 keV, derived from all available Chandra data of sufficient quality. In all clusters,...
The rich cluster of galaxies ABCG 85. III. Analyzing the ABCG 85/87/89 complex (2005)
Durret, F., Forman, W., Gerbal, D., Jones, C., Vikhlinin, A.
We present a combined X-ray and optical analysis of the ABCG 85/87/89 complex of clusters of galaxies, based on the ROSAT PSPC image, optical photometric catalogues (Slezak et al. 1998), and an...
XMM-Newton Observations of Evolution of Cluster X-Ray Scaling Relations at z=0.4-0.7 (2005)
We present a spatially-resolved analysis of the temperature and gas density profiles of galaxy clusters at z=0.4-0.7 observed with XMM-Newton. These data are used to derive the total cluster mass...
Reflections of active galactic nucleus outbursts in the gaseous atmosphere of M87 (2005)
Forman, W., Nulsen, P., Heinz, S., Owen, S., Eilek, J., Vikhlinin, A., ...
Outbursts from the supermassive black hole in M87 and the impact on the hot gas (2005)
Jones, C., Forman, W., Kraft, R., Markevitch, M., Nulsen, P., Vikhlinin, A., ...
Reflections of Active Galactic Nucleus Outbursts in the Gaseous Atmosphere of M87 (2005)
Forman, W., Nulsen, P., Heinz, S., Owen, F., Eilek, J., Vikhlinin, A., ...
We combined deep Chandra, ROSAT HRI, and XMM-Newton observations of M87 to study the impact of active galactic nucleus (AGN) outbursts on its gaseous atmosphere. Many X-ray features appear to be a...
Reflections of Active Galactic Nucleus Outbursts in the Gaseous Atmosphere of M87 (2005)
Forman, W., Nulsen, P., Heinz, S., Owen, F., Eilek, J., Vikhlinin, A., ...
We combined deep Chandra, ROSAT HRI, and XMM-Newton observations of M87 to study the impact of active galactic nucleus (AGN) outbursts on its gaseous atmosphere. Many X-ray features appear to be a...
Chandra temperature profiles for a sample of nearby relaxed galaxy clusters (2004)
Vikhlinin, A., Markevitch, M., Murray, S. S., Jones, C., Forman, W., Van Speybroeck, L.
We present Chandra gas temperature profiles at large radii for a sample of 13 nearby, relaxed galaxy clusters and groups, which includes A133, A262, A383, A478, A907, A1413, A1795, A1991, A2029,...
We present the result from a CHANDRA observation of an X-ray luminous starburst galaxy UGC 6697, which is embedded in the northwest hot region of A1367 (5 - 6 keV). A very sharp X-ray edge (~ 13...
Krivonos, R., Vikhlinin, A., Churazov, E., Lutovinov, A., Molkov, S., Sunyaev, R.
We present the analysis of serendipitous sources in a deep, 500 ksec, hard X-ray observation of the Coma cluster region with the IBIS instrument onboard INTEGRAL. In addition to the Coma cluster, the...
Sun, M., Vikhlinin, A., Forman, W., Jones, C., Murray, S. S.
A new Chandra observation of the northwest region of the galaxy cluster A1367 reveals four cool galaxy coronae (0.4 - 1.0 keV) embedded in the hot intracluster medium (ICM) (5 - 6 keV). While the...
Infall of the Elliptical Galaxy NGC 1404 into the Fornax Cluster (2004)
Machacek, M., Dosaj, A., Forman, W., Jones, C., Markevitch, M., Vikhlinin, A., ...
We use three Chandra observations, totalling 134.3 ks, to constrain the dynamical motion of NGC1404 falling towards the dominant elliptical NGC1399 through the Fornax ICM. NGC1404's surface...
ESO 3060170 -- a massive fossil galaxy group with a heated gas core? (2004)
Sun, M., Forman, W., Vikhlinin, A., Hornstrup, A., Jones, C., Murray, S. S.
We present a detailed study of the ESO 3060170 galaxy group combining Chandra, XMM and optical observations. The system is found to be a fossil galaxy group. The group X-ray emission is composed of a...
Evolution of the Cluster X-ray Luminosity Function (2004)
Mullis, C. R., Vikhlinin, A., Henry, J. P., Forman, W., Gioia, I. M., Hornstrup, A., ...
We report measurements of the cluster X-ray luminosity function out to z=0.8 based on the final sample of 201 galaxy systems from the 160 Square Degree ROSAT Cluster Survey. There is little evidence...
Chandra Temperature Maps for Galaxy Clusters with Radio Halos (2004)
Govoni, F., Markevitch, M., Vikhlinin, A., VanSpeybroeck, L., Feretti, L., Giovannini, G.
We analyze Chandra temperature maps for a sample of clusters with high quality radio halo data, to study the origin of the radio halos. The sample includes A520, A665, A754, A773, A1914, A2163,...
Reflections of AGN Outbursts in the Gaseous Atmosphere of M87 (2003)
Forman, W., Nulsen, P., Heinz, S., Owen, F., Eilek, J., Vikhlinin, A., ...
We combined deep Chandra, ROSAT HRI, and XMM-Newton observations of M87 to study the impact of AGN outbursts on its gaseous atmosphere. Many X-ray features appear to be a direct result of repetitive...
Markevitch, M., Gonzalez, A. H., Clowe, D., Vikhlinin, A., David, L., Forman, W., ...
We compare new maps of the hot gas, dark matter, and galaxies for 1E0657-56, a cluster with a rare, high-velocity merger occurring nearly in the plane of the sky. The X-ray observations reveal a...
Sun, M., Forman, W., Vikhlinin, A., Hornstrup, A., Jones, C., Murray, S. S.
We present a detailed \chandra study of the galaxy group NGC 1550. For its temperature (1.37$\pm$0.01 keV) and velocity dispersion ($\sim$ 300 km s$^{-1}$), the NGC 1550 group is one of the most...
A Possible Shock Wave in the Intergalactic Medium of the Cluster of Galaxies A754 (2003)
Krivonos, R., Vikhlinin, A., Markevitch, M., Pavlinsky, M.
The cluster of galaxies A754 undergoes a merger of several large structural units. X-ray observations show a nonequilibrium state of the central part of the cluster, in which a cloud of cold plasma...
Soft X-Ray Sources at the Centers of the Elliptical Galaxies NGC 4472 and NGC 4649 (2003)
Soldatenkov, D., Vikhlinin, A., Pavlinsky, M.
Analysis of recent Chandra observations of the elliptical galaxies NGC 4472 and NGC 4649 has revealed faint soft X-ray sources at their centers. The sources are located to within 1'' of the optical...
We derive the baryon mass function for a complete sample of low-redshift clusters and argue that it is an excellent proxy for the total mass function if the ratio f_b=M_b/M_tot in all clusters is...
Mullis, C. R., McNamara, B. R., Quintana, H., Vikhlinin, A., Henry, J. P., Gioia, I. M., ...
We present the revised catalog of galaxy clusters detected as extended X-ray sources in the 160 Square Degree ROSAT Survey, including spectroscopic redshifts and X-ray luminosities for 200 of the 201...
Kraft, R. P., Forman, W. R., Churazov, E., Laslo, N., Jones, C., ...
We present results from a 45 ks Chandra/ACIS-I observation of the nearby ($z=0.01646$) NGC 507 group. The X-ray surface brightness profile of the outer region of the group is well described by an...
A High Angular Resolution View of Hot Gas in Clusters, Groups, and Galaxies (2003)
Forman, W., Churazov, E., David, L., Durret, F., Jones, C., Markevitch, M., ...
We discuss two themes from Chandra and XMM-Newton observations of galaxies, groups, and clusters. First, we review observational aspects of cluster formation and evolution as matter accretes along...
Chandra Temperature Map of Abell 754 and Constraints on Thermal Conduction (2003)
Markevitch, M., Mazzotta, P., Vikhlinin, A., Burke, D., Butt, Y., David, L., ...
We use Chandra data to derive a detailed gas temperature map of the nearby, hot, merging galaxy cluster A754. Combined with the X-ray and optical images, the map reveals a more complex merger...
Cosmological constraints from evolution of cluster baryon mass function at z~0.5 (2002)
Vikhlinin, A., Voevodkin, A., Mullis, C. R., VanSpeybroeck, L., Quintana, H., McNamara, B. R., ...
We present a new method for deriving cosmological constraints based on the evolution of the baryon mass function of galaxy clusters, and implement it using 17 distant clusters from our 160deg2 ROSAT...
A Cold Front in A3667: Hydrodynamics and Magnetic Field in the Intracluster Medium (2002)
This conference presentation discusses a Chandra observation of the cold front in Abell 3667. We first review our earlier results which include a measurement of the front velocity, M~1, using the...
Chandra Spectra of the Soft X-ray Diffuse Background (2002)
Markevitch, M., Bautz, M. W., Biller, B., Butt, Y., Edgar, R., Gaetz, T., ...
We present an exploratory Chandra ACIS-S3 study of the diffuse component of the Cosmic X-ray Background in the 0.3-7 keV band for four directions at high Galactic latitudes, with emphasis on details...
A High Resolution Picture of the Intracluster Gas (2002)
Markevitch, M., Vikhlinin, A., Forman, W. R.
Chandra has significantly advanced our knowledge of the processes in the intracluster gas. The discovery of remarkably regular ``cold fronts'', or contact discontinuities, in merging clusters showed...
Evolution of the cluster X-ray scaling relations since z>0.4 (2002)
Vikhlinin, A., VanSpeybroeck, L., Markevitch, M., Forman, W. R., Grego, L.
We derive correlations between X-ray temperature, luminosity, and gas mass for a sample of 22 distant, z>0.4, galaxy clusters observed with Chandra. We detect evolution in all three correlations...
Galaxy Clusters with Chandra (2002)
Forman, W., Jones, C., Markevitch, M., Vikhlinin, A., Churazov, E.
We discuss Chandra results related to 1) cluster mergers and cold fronts and 2) interactions between relativistic plasma and hot cluster atmospheres. We describe the properties of cold fronts using...
Chandra Observations of NGC 4636--an Elliptical Galaxy in Turmoil (2002)
Jones, C., Forman, W., Vikhlinin, A., Markevitch, M., David, L., Warmflash, A., ...
Chandra images show symmetric, 8 kpc long, armlike features in the X-ray halo surrounding NGC 4636. The leading edges of these features are sharp and are accompanied by temperature increases of...
Chandra Observations of NGC 4636--an Elliptical Galaxy in Turmoil (2002)
Jones, C., Forman, W., Vikhlinin, A., Markevitch, M., David, L., Warmflash, A., ...
Chandra images show symmetric, 8 kpc long, armlike features in the X-ray halo surrounding NGC 4636. The leading edges of these features are sharp and are accompanied by temperature increases of...
Chandra observations of clusters of galaxies (2002)
Forman, W., Donnelly, H., Markevitch, M., Kraft, R., Murray, S., Vikhlinin, A., ...
We discuss two themes from Chandra cluster observations. First, we describe the interaction of buoyant, radio emitting plasma bubbles with the hot intracluster gas. Second we summarize the Chandra...
Chandra Observations of NGC 4636--an Elliptical Galaxy in Turmoil (2002)
Jones, C., Forman, W., Vikhlinin, A., Markevitch, M., David, L., Warmflash, A., ...
Chandra images show symmetric, 8 kpc long, armlike features in the X-ray halo surrounding NGC 4636. The leading edges of these features are sharp and are accompanied by temperature increases of...
Chandra Observations of NGC 4636—an Elliptical Galaxy in Turmoil (2002)
Jones, C., Forman, W., Vikhlinin, A., Markevitch, M., David, L., Warmflash, A., ...
Chandra images show symmetric, 8 kpc long, armlike features in the X-ray halo surrounding NGC 4636. The leading edges of these features are sharp and are accompanied by temperature increases of...
Forman, W., Jones, C., Markevitch, M., Vikhlinin, A., Churazov, E.
We discuss two themes from Chandra observations of galaxies, groups, and clusters. First, we review the merging process as seen through the high angular resolution of Chandra. We present examples of...
A Textbook Example of a Bow Shock in the Merging Galaxy Cluster 1E0657-56 (2001)
Markevitch, M., Gonzalez, A. H., David, L., Vikhlinin, A., Murray, S., Forman, W., ...
The Chandra image of the merging, hot galaxy cluster 1E0657-56 reveals a bow shock propagating in front of a bullet-like gas cloud just exiting the disrupted cluster core. This is the first clear...
New Results from Chandra (2001)
Forman, W., Markevitch, M., Jones, C., Vikhlinin, A., Churazov, E.
We discuss two themes from Chandra observations of galaxies and clusters. First, we describe the effects of radio-emitting plasmas or ``bubbles'', inflated by active galactic nuclei, on the hot X-ray...
Chandra Observations of Cold Fronts in Cluster of Galaxies (2001)
Mazzotta, P., Markevitch, M., Vikhlinin, A., Forman, W. R.
High-resolution Chandra images of several clusters of galaxies reveal sharp, edge-like discontinuities in their gas density. The gas temperature is higher in front of the edge where the density is...
Non-hydrostatic gas in the core of the relaxed galaxy cluster A1795 (2001)
Markevitch, M., Vikhlinin, A., Mazzotta, P.
Chandra data on A1795 reveal a mild edge-shaped discontinuity in the gas density and temperature in the southern sector of the cluster at r=60/h kpc. The gas inside the edge is 1.3-1.5 times denser...
Chandra Observation of MS 1455.0+2232: cold fronts in a massive cooling flow cluster? (2001)
Mazzotta, P., Markevitch, M., Forman, W. R., Jones, C., Vikhlinin, A., VanSpeybroeck, L.
We present the Chandra observation of the cluster of galaxies MS 1455.0+2232. From previous ASCA and ROSAT observations, this cluster was identified as a ``relaxed'' cluster that hosts one of the...
Chandra Observations of NGC 4636 - An Elliptical Galaxy in Turmoil (2001)
Jones, C., Forman, W., Vikhlinin, A., Markevitch, M., David, L., Warmflash, A., ...
Chandra images show symmetric, 8 kpc long, arm-like features in the X-ray halo surrounding NGC 4636. The leading edges of these features are sharp and are accompanied by temperature increases of...
A Richness Study of 14 Distant X-ray Clusters From the 160 Square Degree Survey (2001)
McNamara, B. R., Vikhlinin, A., Hornstrup, A., Quintana, H., Whitman, K., Forman, W., ...
We have measured the surface density of galaxies toward 14 X-ray-selected cluster candidates at redshifts greater than z=0.46, and we show that they are associated with rich galaxy concentrations. We...
Merger shocks in galaxy clusters A665 and A2163 and their relation to radio halos (2001)
We present Chandra gas temperature maps for two hot, intermediate-redshift clusters A665 and A2163. Both show strong temperature variations in their central r=1 Mpc regions, naturally interpreted as...
Chandra observtaion of A2256 - a cluster at the early stage of merging (2001)
Sun, M., Murray, S. S., Markevitch, M., Vikhlinin, A.
We present here \chandra observations of the rich cluster of galaxies A2256. In addition to the known cool subcluster, a new structure was resolved 2$'$ east of the peak of the main cluster. Its...
Vikhlinin, A., Markevitch, M., Forman, W., Jones, C.
The Chandra image of the central region of the Coma cluster reveals that both its dominant galaxies, NGC4874 and NGC4889, retain the central parts of their X-ray gas coronae. The interstellar gas...
Chandra Observation of RXJ1720.1+2638: a Nearly Relaxed Cluster with a Fast Moving Core? (2001)
Mazzotta, P., Markevitch, M., Vikhlinin, A., Forman, W. R., David, L. P., VanSpeybroeck, L.
We have analyzed the Chandra observation of the distant (z=0.164) galaxy cluster RXJ1720.1+2638 in which we find sharp features in the X-ray surface brightness on opposite sides of the X-ray peak: an...
Temperature Structure of Four Merging Clusters Obtained with Chandra (2000)
Markevitch, M., Vikhlinin, A., Mazzotta, P., VanSpeybroeck, L.
We present preliminary Chandra results on z=0.2 clusters A665, A2163 and A2218, and a z=0.05 cluster A754. For A754, A665 and A2163, we have derived first high-resolution projected gas temperature...
Wilkes, B. J., Green, P., Brissenden, R., Cameron, R., Dobrzycki, A., Drake, J., ...
The launch of the Chandra X-ray Observatory in July 1999 opened a new era in X-ray astronomy. Its unprecedented,
Chandra study of an overdensity of X-ray sources around two distant (z~0.5) clusters (2000)
Cappi, M., Mazzotta, P., Elvis, M., Burke, D. J., Comastri, A., Fiore, F., ...
We present results from a Chandra X-ray Observatory study of the field X-ray source populations in 4 different observations: two high-redshift (z~0.5) clusters of galaxies 3C295 and...
A moving cold front in the intergalactic medium of A3667 (2000)
Vikhlinin, A., Markevitch, M., Murray, S. S.
We present results from a Chandra observation of the central region of the galaxy cluster A3667, with emphasis on the prominent sharp X-ray brightness edge spanning 0.5 Mpc near the cluster core. Our...
Chandra estimate of the magnetic field strength near the cold front in A3667 (2000)
Vikhlinin, A., Markevitch, M., Murray, S. S.
We use the Chandra observation of the cold front in the intracluster gas of A3667 to estimate the magnetic field strength near the front. The front is seen in the Chandra data as a sharp...
McNamara, B. R., Wise, M., Nulsen, P., David, L. P., Sarazin, C. L., Bautz, M., ...
We present Chandra X-ray observations of the Hydra A cluster of galaxies, and we report the discovery of structure in the central 80 kpc of the cluster's X-ray-emitting gas. The most remarkable...
McNamara, B. R., Wise, M., Nulsen, P., David, L. P., Sarazin, C. L., Bautz, M., ...
We present Chandra X-ray observations of the Hydra A cluster of galaxies, and we report the discovery of structure in the central 80 kpc of the cluster's X-ray-emitting gas. The most remarkable...
McNamara, B. R., Wise, M., Nulsen, P. E. J., David, L. P., Sarazin, C. L., Bautz, M., ...
We present Chandra X-ray Observations of the Hydra A cluster of galaxies, and we report the discovery of structure in the central 80 kpc of the cluster's X-ray-emitting gas. The most remarkable...
Chandra Observation of Abell 2142: Survival of Dense Subcluster Cores in a Merger (2000)
Markevitch, M., Ponman, T. J., Nulsen, P. E. J., Bautz, M. W., Burke, D. J., David, L. P., ...
We use Chandra data to map the gas temperature in the central region of the merging cluster A2142. The cluster is markedly nonisothermal; it appears that the central cooling flow has been disturbed...
McNamara, B. R., Wise, M., Nulsen, P., David, L. P., Sarazin, C. L., Bautz, M., ...
We present Chandra X-ray observations of the Hydra A cluster of galaxies, and we report the discovery of structure in the central 80 kpc of the cluster's X-ray-emitting gas. The most remarkable...
McNamara, B. R., Wise, M., Nulsen, P., David, L. P., Sarazin, C. L., Bautz, M., ...
We present Chandra X-ray observations of the Hydra A cluster of galaxies, and we report the discovery of structure in the central 80 kpc of the cluster's X-ray-emitting gas. The most remarkable...
In X-ray binaries, several percent of the compact object luminosity is intercepted by the surface of the normal companion and re-radiated through Compton reflection and the K-fluorescence. This...
Outer Regions of the Cluster Gaseous Atmospheres (1999)
Vikhlinin, A., Forman, W., Jones, C.
We present a systematic study of the hot gas distribution in the outer regions of regular clusters using ROSAT PSPC data. Outside the cooling flow region, the beta-model describes the observed...
X-ray Over-Luminous Elliptical Galaxies: A New Class of Mass Concentrations in the Universe? (1999)
Vikhlinin, A., McNamara, B. R., Hornstrup, A., Quintana, H., Forman, W., Jones, C., ...
We detect four isolated, X-ray over-luminous (Lx>2e43 [h/0.5]**-2 erg/s) elliptical galaxies (OLEGs) in our 160 square degree ROSAT PSPC survey. The extent of their X-ray emission, total X-ray...
Physics of the Merging Clusters Cygnus A, A3667, and A2065 (1998)
Markevitch, M., Sarazin, C. L., Vikhlinin, A.
We present ASCA gas temperature maps of the nearby merging galaxy clusters Cygnus A, A3667, and A2065. Cygnus A appears to have a particularly simple merger geometry that allows an estimate of the...
Vikhlinin, A., McNamara, B. R., Forman, W., Jones, C., Quintana, H., Hornstrup, A.
We searched for cluster X-ray luminosity and radius evolution using our sample of 200 galaxy clusters detected in the 160 deg^2 survey with the ROSAT PSPC (Vikhlinin et al. 1998, astro-ph/9803099)....
The rich cluster of galaxies ABCG 85. III. Analyzing the ABCG 85/87/89 complex (1998)
Durret, F., Forman, W., Gerbal, D., Jones, C., Vikhlinin, A.
We present a combined X-ray and optical analysis of the ABCG 85/87/89 complex of clusters of galaxies, based on the ROSAT PSPC image, optical photometric catalogues (Slezak et al. 1998), and an...
The rich cluster of galaxies ABCG 85. III. Analyzing the ABCG 85/87/89 complex (1998)
Durret, F., Forman, W., Gerbal, D., Jones, C., Vikhlinin, A.
We present a combined X-ray and optical analysis of the ABCG 85/87/89 complex of clusters of galaxies, based on the ROSAT PSPC image, optical photometric catalogues (Slezak et al. 1998), and an...
The rich cluster of galaxies ABCG 85. III. Analyzing the ABCG 85/87/89 complex (1998)
Durret, F., Forman, W., Gerbal, D., Jones, C., Vikhlinin, A.
We present a combined X-ray and optical analysis of the ABCG 85/87/89 complex of clusters of galaxies, based on the ROSAT PSPC image, optical photometric catalogues (Slezak et al. 1998), and an...
Markevitch, M., Forman, W. R., Sarazin, C. L., Vikhlinin, A.
We present ASCA temperature profiles and, when possible, crude temperature maps for a sample of bright clusters with 0.04
Dark Matter and Baryon Fraction at the Virial Radius in Abell 2256 (1997)
We combine ASCA and ROSAT X-ray data to constrain the radial dark matter distribution in the primary cluster of A2256, free from the isothermality assumption. Both instruments indicate that the...
Another Collision for the Coma Cluster (1996)
Vikhlinin, A., Forman, W., Jones, C.
We describe a wavelet transform analysis of the ROSAT PSPC images of the Coma cluster. On small scales, ~< 1', the wavelet analysis shows substructure dominated by two extended sources surrounding...
Two Distinct Modes In The Low (Hard) State Of Cyg X-1 And 1E1740-294 (1996)
Kuznetsov, S., Gilfanov, M., Churazov, E., Sunyaev, R., Vikhlinin, A., Khavenson, N., ...
The entire dataset of the GRANAT/SIGMA observations of Cyg X-1 and 1E1740.7-294 in 1990-1994 was analyzed in order to search for correlations between primary observational characteristics of the hard...
Detection of the Angular Correlation of Faint X-ray Sources (1995)
We have analyzed a set of deep ROSAT observations with a total sky coverage of 40 square degrees to search for clustering of faint X-ray sources. Using the resulting catalog of discrete X-ray...