Archive Scientist at the Fermi Science Support Center at NASA/GSFC
Ph.D. Astronomy - University of Maryland, 1994
M.S. Physics - University of Florida, 1983
B.S. Physics - University of Alabama, 1981
Dave Davis is a graduate from the University of Maryland Department of Astronomy. His thesis work was at Goddard Space Flight Center and was directed by Dr. Richard Mushotzky. His thesis work involved searching an X-ray flux limited sample of galaxy clusters for X-ray substructure. Other research areas while at GSFC were the X-ray properties of poor groups of galaxies and he was part of the team that discovered hot X-ray gas in the NGC 2300 group. His was also active in the determining the X-ray properties of moderate redshift clusters. He was at the University of Alabama in the Department of Physics and Astronomy as an EPSCoR Postdoctoral Research Associate.
My primary research interests are in the study of Galaxy Clusters, which are large collections of galaxies that are gravitationally bound. These clusters represent the largest structures in the universe that have had time to coalesce. This makes them one method to study structure formation in the universe. Since galaxy clusters are some of the latest structures for form in the universe we can determine the amount of matter and dark matter by measureing the spatial distribution along with the dynamic state (how "relaxed" a cluster is) of these massive systems.
To this end I have experience with data collected by the following satellites: ROSAT, ASCA, the Chandra X-ray Observaory, XMM-Newton, and Suzaku.
Fermi Large Area Telescope Second Source Catalog, Nolan, P. L.; Abdo, A. A.; Ackermann, M.; Ajello, M.; Allafort, A.; Antolini, E.; Atwood, W. B.; Axelsson, M.; Baldini, L.; Ballet, J.; and 227 coauthors including Bonnell, J. T.; Celik, Ö.; Moiseev, A. A.; Corbet, R. H. D.; Davis, D. S., and 67 other authors, 2012, ApJS 199, 931.
An In-depth Study of the Abundance Pattern in the Hot Interstellar Medium in NGC 4649,
Loewenstein, Michael; Davis, David S. , 2012, ApJ 757, 121
The Outer Limits of Galaxy Clusters: Observations to the Virial Radius with Suzaku, XMM, and Chandra Miller, Eric D.; Bautz, Marshall; George, Jithin; Mushotzky, Richard; Davis, David; Henry, J. Patrick , 2012, AIPC, 1427, 13
Fermi/LAT Observations of Swift/BAT Seyfert Galaxies: On the Contribution of Radio-quiet Active Galactic Nuclei to the Extragalactic
Gamma-Ray Background, Teng, Stacy H.; Mushotzky, Richard F.; Sambruna, Rita M.; Davis, David S.; Reynolds, Christopher S.,
2011, ApJ 742, 62
Multi-wavelength Observations of the Flaring Gamma-ray Blazar 3C 66A in 2008 October,
Abdo, A. A.; Ackermann, M.; Ajello, M.; Baldini, L.; Ballet, J.; Barbiellini, G.; Bastieri, D.; Bechtol, K.; Bellazzini, R.; Berenji, B.; and 318 coauthors including Celik, Ö.; Moiseev, A. A.; Vasileiou, V. V.; Perkins, J. S.; Davis, D. S , and 318 other authors, 2011, ApJ 726, 43
Fermi Gamma-Ray Imaging of a Radio Galaxy, Abdo, A. A.; Ackermann, M.; Ajello, M.; Atwood, W. B.; Baldini, L.; Ballet, J.; Barbiellini, G.; Bastieri, D.; Baughman, B. M.; Bechtol, K.; and 171 coauthors including Celik, O.; Vasileiou, V. V.; Moiseev, A. A.; Davis, D. S., and 172 other authors,
2010, Sci, 328, 725
Testing the Reliability of Cluster Mass Indicators with a Systematics Limited Dataset,
Juett, Adrienne M., Davis, David S. Mushotzky, Richard, 2010, ApJL, 709, 103
The Abundance Pattern in the Hot ISM of NGC 4472: Insights and Anomalies, Loewenstein, M., Davis, D. S.;,
2010, ApJ, 716, 384
A catalog of galaxy clusters observed by XMM-Newton,
Snowden, S. L., Mushotzky, R. F., Kuntz, K. D., Davis, D. S., 2008, A&A, 478, 615
My recent work has concentrated on the outer atmosphere of galaxy clusters neear the virial radius and searching for signs of non-equalibrium structures at large radii.