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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 2002 · astro-phShow all

2 papers · 2 filters

astro-ph2002★ 80 cited

The Properties of Microjansky Radio Sources in the HDF-N, SSA13, and SSA22 Fields

S. C. Chapman, A. J. Barger, L. L. Cowie +9

(abridged) We present multiwavelength observations for a large sample of microjansky radio sources detected in ultradeep 1.4GHz maps centered on the Hubble Deep Field-North (HDF-N)…

astro-ph2002★ 226 cited

X-ray, Optical, and Infrared Imaging and Spectral Properties of the 1 Ms Chandra Deep Field North Sources

A. J. Barger, L. L. Cowie, W. N. Brandt +5

We present the optical, near-infrared, submillimeter, and radio follow-up catalog of the X-ray selected sources from the 1 Ms Chandra observation of the Hubble Deep Field North reg…

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