Tracing Star Formation in Cool Core Clusters with GALEX (2009)
Hicks, Amalia, Mushotzky, Richard F., Donahue, Megan
We present recent results from a GALEX investigation of star formation in 16 cooling core clusters of galaxies, selected to span a broad range in both redshift and central cooling time. Initial...
Intracluster Medium Entropy Profiles for a Chandra Archival Sample of Galaxy Clusters (2009)
Cavagnolo, Kenneth W., Donahue, Megan, Voit, G. Mark, Sun, Ming
We present radial entropy profiles of the intracluster medium (ICM) for a collection of 239 clusters taken from the Chandra X-ray Observatory's Data Archive. Entropy is of great interest because it...
Substructure and Scatter in the Mass-Temperature Relations of Simulated Clusters (2008)
Ventimiglia, David A., Voit, G. Mark, Donahue, Megan, Ameglio, S.
Galaxy clusters exhibit regular scaling relations among their bulk properties. These relations establish vital links between halo mass and cluster observables. Precision cosmology studies that depend...
An Entropy Threshold for Strong H-alpha and Radio Emission in the Cores of Galaxy Clusters (2008)
Cavagnolo, Kenneth W., Donahue, Megan, Voit, G. Mark, Sun, Ming
Our Chandra X-ray Observatory archival study of intracluster entropy in a sample of 222 galaxy clusters shows that H-alpha and radio emission from the brightest cluster galaxy are much more...
Bandpass Dependence of X-ray Temperatures in Galaxy Clusters (2008)
Cavagnolo, Kenneth W., Donahue, Megan, Voit, G. Mark, Sun, Ming
We explore the band dependence of the inferred X-ray temperature of the intracluster medium (ICM) for 192 well-observed galaxy clusters selected from the Chandra Data Archive. If the hot ICM is...
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....
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...
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...
Infrared Emission from the Nearby Cool Core Cluster Abell 2597 (2007)
Donahue, Megan, Jordan, Andres, Baum, Stefi A., Cote, Patrick, Ferrarese, Laura, Goudfrooij, Paul, ...
We observed the brightest central galaxy (BCG) in the nearby (z=0.0821) cool core galaxy cluster Abell 2597 with the IRAC and MIPS instruments on board the Spitzer Space Telescope. The BCG was...
Donahue, Megan, Sun, Ming, O'Dea, Christopher P., Voit, G. Mark, Cavagnolo, Kenneth W.
We present deep emission-line imaging taken with the SOAR Optical Imaging Camera of the brightest cluster galaxy (BCG) in the nearby (z=0.035) X-ray cluster 2A0335+096. We analyze long-slit optical...
Donahue, Megan, Ming, Sun, O'Dea, Christopher, Voit, G. Mark, Cavagnolo, Kenneth
Also archived in: arXiv:0705.1659 v1 May 11 2007
Cold Gas in Cluster Cores (2006)
I review the literature's census of the cold gas in clusters of galaxies. Cold gas here is defined as the gas that is cooler than X-ray emitting temperatures (~10^7 K) and is not in stars. I present...
Entropy Profiles in the Cores of Cooling Flow Clusters of Galaxies (2005)
Donahue, Megan, Horner, Donald J., Cavagnolo, Kenneth W., Voit, G. Mark
The X-ray properties of a relaxed cluster of galaxies are determined primarily by its gravitational potential well and the entropy distribution of its intracluster gas. That entropy distribution...
An Observationally Motivated Framework for AGN Heating of Cluster Cores (2005)
The cooling-flow problem is a long-standing puzzle that has received considerable recent attention, in part because the mechanism that quenches cooling flows in galaxy clusters is likely to be the...
Two clusters of galaxies with radio-quiet cooling cores (2005)
Donahue, Megan, Voit, G. Mark, O’Dea, Christopher, Baum, Stefi, Sparks, William
Also archived in: arXiv: astro-ph/0508587 v1 26 Aug 2005
Two clusters of galaxies with radio-quiet cooling cores (2005)
Donahue, Megan, Voit, G. Mark, O’Dea, Christopher, Baum, Stefi, Sparks, William
Also archived in: arXiv: astro-ph/0508587 v1 26 Aug 2005
Two Clusters with Radio-quiet Cooling Cores (2005)
Donahue, Megan, Voit, G. Mark, O'Dea, Christopher P., Baum, Stefi A., Sparks, William B.
Radio lobes inflated by active galactic nuclei at the centers of clusters are a promising candidate for halting condensation in clusters with short central cooling times because they are common in...
X-ray and Optical Filaments in M87 (2004)
Sparks, William B., Donahue, Megan, Jordan, Andres, Ferrarese, Laura, Cote, Patrick
We compare a very deep X-ray image of M87, at the center of the Virgo Cluster, to high-quality optical images of the low excitation emission-line gas in the same region. There are striking...
Donahue, Megan, Gaskin, Jessica A., Patel, Sandeep K., Joy, Marshall, Clowe, Doug, Hughes, John P.
We present new Chandra X-ray observations of the luminous X-ray cluster, MS0451.6-0305, at z=0.5386. Spectral imaging data for the cluster are consistent with an isothermal cluster of 10.0 - 10.6...
Cool Gas in Clusters of Galaxies (2003)
Early X-ray observations suggested that the intracluster medium cools and condenses at the centers of clusters, leading to a cooling flow of plasma in the cluster core. The increased incidence of...
Chandra Observations of the Interacting NGC 4410 Galaxy Group (2003)
Smith, Beverly J., Nowak, Michael, Donahue, Megan, Stocke, John
We present high resolution X-ray imaging data from the ACIS-S instrument on the Chandra telescope of the nearby interacting galaxy group NGC 4410. Four galaxies in the inner portion of this group are...
Donahue, Megan, Daly, Ruth A., Horner, Donald J.
We present new Chandra Observatory observations with archival HST and radio observations of 3C254, a radio quasara at z=0.734, and 3C280, a radio galaxy at z=0.996. We report the detection of X-ray...
Postman, Marc, Lauer, Tod R., Oegerle, William, Donahue, Megan
We have conducted an automated search for galaxy clusters within a contiguous 16 square degree I-band survey in the north Galactic hemisphere. A matched filter detection algorithm identifies 444...
Star Formation in the Radio Galaxy NGC 4410A (2002)
Donahue, Megan, Smith, Beverly J., Stocke, John T.
The NGC4410 group of galaxies provides us a rare opportunity to study a nearby (97 h75^-1 Mpc) example of a radio galaxy (NGC4410A) embedded in an extended X-ray source, with evidence for star...
Sloan Digital Sky Survey: Early data release (2002)
Stoughton, Chirs, Lupton, Rpbert H., Bernardi, Mariangela, Blanton, Michael R., Burles, Scott, Castander, Francsico J., ...
The Sloan Digital Sky Survey (SDSS) is an imaging and spectroscopic survey that will eventually cover approximately one-quarter of the celestial sphere and collect spectra of 10 6 galaxies, 100,000...
Sloan Digital Sky Survey: Early Data Release (2002)
Stoughton, Chris, Lupton, Robert H., Bernardi, Mariangela, Blanton, Michael R., Burles, Scott, Castander, Francisco J., ...
Newberg, Heidi Jo, Yanny, Brian, Rockosi, Connie, Grebel, Eva K., Rix, Hans-Walter, Brinkmann, Jon, ...
Donahue, Megan, Scharf, Caleb, Mack, Jennifer, Lee, Paul, Postman, Marc, Rosati, Piero, ...
We present and analyze the optical and X-ray catalogs of moderate-redshift cluster candidates from the ROSAT Optical X-ray Survey, or ROXS. The survey covers 4.8 square degrees (23 ROSAT PSPC...
Donahue, Megan, Mack, Jennifer, Scharf, Caleb, Lee, Paul, Postman, Marc, Rosati, Piero, ...
We present a comparison of X-ray and optical luminosities and luminosity functions of cluster candidates from a joint optical/X-ray survey, the ROSAT Optical X-Ray Survey. Completely independent...
Discovery of ghost cavities in Abell 2597's X-ray atmosphere (2001)
McNamara, Brian, Wise, Michael, Nulsen, Paul, David, Laurence, Carilli, Chris, Sarazin, Craig, ...
Also archived in: arXiv: astro-ph/0110554 v1 25 Oct 2001
Discovery of ghost cavities in Abell 2597's X-ray atmosphere (2001)
McNamara, Brian, Wise, Michael, Nulsen, Paul, David, Laurence, Carilli, Chris, Sarazin, Craig, ...
Also archived in: arXiv: astro-ph/0110554 v1 25 Oct 2001
Chandra X-Ray Observatory Observation of the High-Redshift Cluster MS 1054-0321 (2001)
Jeltema, Tesla E., Canizares, Claude R., Bautz, Mark W., Malm, Michael R., Donahue, Megan, Garmire, Gordon P.
We observed MS 1054-0321, the highest redshift cluster of galaxies in the Einstein Medium Sensitivity Survey (EMSS), with the Chandra ACIS-S detector. We find the X-ray temperature of the cluster to...
Interstellar Gas and Star Formation Near the Peculiar Radio Galaxy NGC 4410A (2000)
Smith, Beverly J., Donahue, Megan, Stocke, John
We present new multi-wavelength data for the NGC 4410 galaxy group. This group contains the peculiar radio galaxy NGC 4410A, which has a distorted double-lobed radio structure. NGC 4410A is strongly...
HST Observations of Vibrationally-Excited Molecular Hydrogen in Cluster Cooling Flow Nebulae (2000)
Donahue, Megan, Mack, Jennifer, Voit, G. Mark, Sparks, William, Elston, Richard, Maloney, Philip R.
We report new HST NICMOS and WFPC2 imaging of emission-line nebulae in the central galaxies of 3 clusters of galaxies purported to host massive cooling flows, NGC1275, A2597, and PKS0745. The...
Evidence for X-ray emission from a large-scale filament of galaxies ? (1999)
Scharf, Caleb, Donahue, Megan, Voit, G. Mark, Rosati, Piero, Postman, Marc
Cosmological simulations predict that a large fraction of the baryonic mass of the Universe exists as 10^5-10^7 K diffuse, X-ray emitting gas, tracing low density filament and sheet-like structures...
The Extended blue continuum and line emission around the Central Radio Galaxy in Abell 2597 (1999)
Koekemoer, Anton, O'Dea, Christopher, Sarazin, Craig, McNamara, Brian, Donahue, Megan, Voit, G. Mark, ...
Also archived in: arXiv: astro-ph/9906335 v1 21 Jun 1999
The extended blue continuum and line emission around the Central Radio Galaxy in Abell 2597 (1999)
Koekemoer, Anton, O'Dea, Christopher, Sarazin, Craig, McNamara, Brian, Donahue, Megan, Voit, G. Mark, ...
Also archived in: arXiv: astro-ph/9906335 v1 21 Jun 1999
Omega-Matter from the Temperature-Redshift Distribution of EMSS Clusters of Galaxies (1999)
We constrain Omega_m through a maximum likelihood analysis of temperatures and redshifts of the high-redshift clusters from the EMSS. We simultaneously fit the low-redshift Markevitch (1998) sample...
The Second Most Distant Cluster of Galaxies in the EMSS (1999)
Donahue, Megan, Voit, G. Mark, Scharf, Caleb A., Gioia, Isabella M., Mullis, Christopher R., Hughes, John P., ...
We report on our ASCA, Keck, and ROSAT observations of MS1137.5+6625, the second most distant cluster of galaxies in the Einstein Extended Medium Sensitivity Survey (EMSS), at redshift 0.78. We now...
On the Evolution of the Temperature-Viral Mass Relation for Clusters of Galaxies (1998)
X-ray temperature measurements of clusters of galaxies are now reaching to redshifts high enough to constrain Omega_0. A redshift-dependent relation that maps these X-ray temperatures to the virial...
A Very Hot, High Redshift Cluster of Galaxies: More Trouble for Omega_0 = 1 (1997)
Donahue, Megan, Voit, G. Mark, Gioia, Isabella M., Luppino, Gerry, Hughes, John P., Stocke, John T.
We have observed the most distant (z=0.829) cluster of galaxies in the Einstein Extended Medium Sensitivity Survey, with the ASCA and ROSAT satellites. We find an X-ray temperature of 12.3 +3.1/-2.2...
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...