Search for sub-mm, mm and radio continuum emission from extremely red objects

Niruj R. Mohan, A. Cimatti, H. J.A. Röttgering, P. Andreani, P. Severgnini, R. P.J. Tilanus, C. L. Carilli, S. A. Stanford

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


We present the results of sub-mm, mm (850 μm, 450 μm and 1250 μm) and radio (1.4 and 4.8 GHz) continuum observations of a sample of 27 K-selected Extremely Red Objects, or EROs, (14 of which form a complete sample with K < 20 and I - K > 5) aimed at detecting dusty starbursts, deriving the fraction of UltraLuminous Infrared Galaxies (ULIGs) in ERO samples, and constraining their redshifts using the radio-FIR correlation. One ERO was tentatively detected at 1250 μm and two were detected at 1.4 GHz, one of which has a less secure identification as an ERO counterpart. Limits on their redshifts and their star forming properties are derived and discussed. We stacked the observations of the undetected objects at 850 μm, 1250 μm and 4.8 GHz in order to search for possible statistical emission from the ERO population as a whole, but no significant detections were derived either for the whole sample or as a function of the average NIR colours. These results strongly suggest that the dominant population of EROs with K < 20 is not comprised of ULIGs like HR 10, but is probably made of radio-quiet ellipticals and weaker starburst galaxies with L < 1012 L and SFR < few hundred M yr-1.

Original languageEnglish (US)
Pages (from-to)440-449
Number of pages10
JournalAstronomy and astrophysics
Issue number2
StatePublished - 2002
Externally publishedYes


  • Galaxies: elliptical and lenticular, cD
  • Galaxies: general
  • Galaxies: high-redshift
  • Infrared: galaxies
  • Radio continuum: galaxies
  • Submillimeter

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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