The Redshift Distribution of Flat‐Spectrum Radio Sources | Zendy

J. A. Muñoz | Zendy; E. Falco | Zendy; C. S. Kochanek | Zendy; Joseph Lehár | Zendy; E. Mediavilla | Zendy

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The Redshift Distribution of Flat‐Spectrum Radio Sources

Author(s) -

J. A. Muñoz,

E. Falco,

C. S. Kochanek,

Joseph Lehár,

E. Mediavilla

Publication year - 2003

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/377077

Subject(s) - redshift , physics , astrophysics , quasar , flux (metallurgy) , astronomy , galaxy , materials science , metallurgy

The redshift distribution of flat-spectrum radio sources with 5 GHz fluxdensities S>5 mJy is a key component in using current radio lens surveys toprobe the cosmological model. We have constructed the first flat-spectrum radiosample in the flux density range 3-20 mJy. Our new sample has 33 sources; wehave determined the redshifts of 14 of these (42% complete). The low meanredshift, ~0.75, of our faintest sample needs to be confirmed by furtherobservations to improve the sample completeness. We also increased the redshiftcompleteness of several surveys of brighter flat-spectrum sources. While themean redshift, ~1.1 of flat-spectrum samples fainter than 1 Jy is nearlyconstant, the fraction of the sources identifiable as quasars steadily dropsfrom ~80% to ~10% as the flux density of the sources decreases.Comment: 26 pages with 4 figures, accepted for publication in Ap

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