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Title:
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.
Affiliation:
AA(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AB(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AC(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AD(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AE(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AF(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AG(University of California, Berkeley, CA, US), AH(University of California, Berkeley, CA, US)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 433, no. 2, p. 435-439 (ApJ Homepage)
Publication Date:
10/1994
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
Astronomical Models, Radio Astronomy, Radio Sources (Astronomy), Sky Surveys (Astronomy), Temperature, Cosmic Background Explorer Satellite, Cross Correlation, Microwave Radiometers, Statistical Analysis
DOI:
10.1086/174655
Bibliographic Code:
1994ApJ...433..435K

Abstract

We have searched the temperature maps from the Cosmic Background Explorer (COBE) Differential Microwave Radiometers (DMR) first two years of data for evidence of unresolved sources. The high-latitude sky (absolute value of b greater than 30 deg) contains no sources brighter than 192 microKelvin thermodynamic temperature (322 Jy at 53 GHz). The cumulative count of sources brighter than threshold T, N(greater than T), is consistent with a superposition of instrument noise plus scale-invariant spectrum of cosmic temperature fluctuations normalized to Qrms-PS = 17 microKelvin. We examine the temperature maps toward nearby clusters and find no evidence for any Sunyaev-Zel'dovich effect, delta y less than 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(greater than S) less than 2 x 104/(S/1 Jy)2/sr.

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