Journal
ASTRONOMY & ASTROPHYSICS
Volume 448, Issue 3, Pages 823-829Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20053712
Keywords
galaxies : active; galaxies : high-redshift; galaxies : starburst; quasars : general; submillimeter
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Our MAMBO 1.2 mm blank field imaging survey of similar to 0.75 sqd has uncovered four unusually bright sources, with flux densities between 10 and 90 mJy, all located in the Abell 2125 field. The three brightest are flat spectrum radio sources with bright optical and X-ray counterparts. Their mm and radio flux densities are variable on timescales of months. Their X-ray luminosities classify them as quasars. The faintest of the four mm bright sources appears to be a bright, radio-quiet starburst at z similar to 3, similar to the sources seen at lower flux densities in the MAMBO and SCUBA surveys. It may also host a mildly obscured AGN of quasar-like X-ray luminosity. The three non-thermal mm sources imply an areal density of flat spectrum radio sources higher by at least 7 compared with that expected from an extrapolation of the lower frequency radio number counts.
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