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A. Steffen

17 papers hereh-index 151.9k citations29 works total

Matching runs newest-first, so older work may not be attached to this profile yet.

author position
  • first author3
  • middle author6
  • last author2

Across the 11 of 17 papers where every author was matched, so the position is known.

fields
  • astro-ph16
  • astro-ph.CO1
same name
  • A. Steffen — 1 paper, h 7

Either other researchers who publish under this name, or the same person where the external sources have not merged their records.

identity via Semantic Scholar / OpenAlex

activity
20012010
most citedThe X-ray-to-Optical Properties of Optically-Selected Active Galaxies Over Wide Luminosity and Redshift Ranges

540 citations · 2.5k across the 17 of their papers we have counts for

collaborators
Showing 2004 · astro-phShow all

3 papers · 2 filters

astro-ph2004★ 432 cited

The Cosmic Evolution of Hard X-ray Selected Active Galactic Nuclei

A. J. Barger, L. L. Cowie, R. F. Mushotzky +4

We use highly spectroscopically complete deep and wide-area Chandra surveys to determine the cosmic evolution of hard X-ray-selected AGNs. We determine hard X-ray luminosity functi…

astro-ph2004★ 53 cited

An Optical Catalog of the Chandra Large Area Synoptic X-ray Survey Sources

A. T. Steffen, A. J. Barger, P. Capak +3

We present photometric and spectroscopic observations of the X-ray sources detected in the wide-area, moderately deep Chandra Large Area Synoptic X-ray Survey of the Lockman Hole-N…

astro-ph2004★ 55 cited

The Chandra Large Area Synoptic X-ray Survey (CLASXS) of the Lockman Hole-Northwest: The X-ray Catalog

Y. Yang, R. F. Mushotzky, A. T. Steffen +2

We present the X-ray catalog and basic results from our Chandra Large Area Synoptic X-ray Survey (CLASXS) of the Lockman Hole-Northwest field. Our 9 ACIS-I fields cover a contiguou…

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Not affiliated with arXiv. Researcher data from Semantic Scholar (ODC-BY) and OpenAlex.