Concepedia

A. T. Steffen

AT

Statistics

Publications

14

Citations

2.3K

H-Index

13

Active since

2001

Affiliations

Pennsylvania State University(Current)

University of Hawaii System

Goddard Space Flight Center

University of Wisconsin–Madison

Columbia University

A. T. Steffen is an author at Pennsylvania State University specializing in natural sciences, x-ray astronomy, and physics.

Publications per year

2001–2009

14

Publications

14

The X-Ray-to-Optical Properties of Optically Selected Active Galaxies over Wide Luminosity and Redshift Ranges

A. T. Steffen, Iskra Strateva, W. N. Brandt et al. · The Astronomical Journal · 2006 · 536 citations · Full text

, , +14

The Cosmic Evolution of Hard X-Ray-selected Active Galactic Nuclei

A. J. Barger, L. L. Cowie, R. F. Mushotzky et al. · The Astronomical Journal · 2005 · 438 citations · Full text

, , +15

The X‐Ray Properties of the Most Luminous Quasars from the Sloan Digital Sky Survey

Dennis W. Just, W. N. Brandt, Ohad Shemmer et al. · The Astrophysical Journal · 2007 · 414 citations · Full text

, , +16

X-Ray, Optical, and Infrared Imaging and Spectral Properties of the 1 M[CLC]s[/CLC] Chandra Deep Field North Sources

A. J. Barger, L. L. Cowie, W. N. Brandt et al. · The Astronomical Journal · 2002 · 229 citations · Full text

, , +15

CHASING HIGHLY OBSCURED QSOs IN THE COSMOS FIELD

F. Fiore, Simonetta Puccetti, M. Brusa et al. · The Astrophysical Journal · 2009 · 228 citations · Full text

, , +13

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