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researcher

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 2008Show all

2 papers · 1 filter

astro-ph2008★ 224 cited

Chasing highly obscured QSOs in the COSMOS field

F. Fiore, S. Puccetti, M. Brusa +41

(abridged) We take advantage of the deep Chandra and Spitzer coverage of a large area (more than 10 times the area covered by the Chandra deep fields, CDFs in the COSMOS field, to…

astro-ph2008★ 83 cited

Tracing the Mass-Dependent Star Formation History of Late-Type Galaxies using X-ray Emission: Results from the Chandra Deep Fields

B. D. Lehmer, W. N. Brandt, D. M. Alexander +11

We report on the X-ray evolution over the last ~9 Gyr of cosmic history (i.e., since z = 1.4) of late-type galaxy populations in the Chandra Deep Field-North and Extended Chandra D…

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