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arXiv:astro-ph/0004054 (astro-ph)
[Submitted on 4 Apr 2000 (v1), last revised 14 Oct 2000 (this version, v2)]

Title:Confusion errors in astrometry and counterpart association

Authors:David W. Hogg (IAS)
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Abstract: In very crowded fields, the modulation of the background by the sea of unresolved faint sources induces centroid shifts. The errors increase with the number of sources per beam. Even the most optimistic simulations of imaging data show that position errors can become severe (on the order of the beam size) at flux levels at which images contain 1/50 to 1/15 sources per beam, depending on the slope of the number-flux relation $d\log N/d\log S$. These problems are expected to be significant for recent observations of faint submillimeter sources and may be the reason that some sources appear to lack optical counterparts.
Comments: submitted to AJ 2000 March 14
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0004054
  (or arXiv:astro-ph/0004054v2 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0004054
Related DOI: https://doi.org/10.1086/318736

Submission history

From: David Hogg [view email]
[v1] Tue, 4 Apr 2000 23:02:22 UTC (334 KB)
[v2] Sat, 14 Oct 2000 01:12:51 UTC (401 KB)
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