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Search For Unresolved Sources In The COBE-DMR Two-Year Sky Maps

Authors
  • Kogut, A.
  • Banday, A. J.
  • Bennett, C. L.
  • Hinshaw, G.
  • Loewenstein, K.
  • Lubin, P.
  • Smoot, G. F.
  • Wright, E. L.
Type
Preprint
Publication Date
Feb 02, 1994
Submission Date
Feb 02, 1994
Identifiers
DOI: 10.1086/174655
arXiv ID: astro-ph/9402007
Source
arXiv
License
Unknown
External links

Abstract

We have searched the temperature maps from the COBE Differential Microwave Radiometers (DMR) first two years of data for evidence of unresolved sources. The high-latitude sky (|b| > 30\deg) contains no sources brighter than 192 uK thermodynamic temperature (322 Jy at 53 GHz). The cumulative count of sources brighter than threshold T, N(> T), is consistent with a superposition of instrument noise plus a scale-invariant spectrum of cosmic temperature fluctuations normalized to Qrms-PS = 17 uK. We examine the temperature maps toward nearby clusters and find no evidence for any Sunyaev-Zel'dovich effect, \Delta y < 7.3 x 10^{-6} (95% CL) averaged over the DMR beam. We examine the temperature maps near the brightest expected radio sources and detect no evidence of significant emission. The lack of bright unresolved sources in the DMR maps, taken with anisotropy measurements on smaller angular scales, places a weak constraint on the integral number density of any unresolved Planck-spectrum sources brighter than flux density S, n(> S) < 2 x 10^4 (S/1 Jy)^{-2} sr^{-1}.

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