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HCN Observations of Submillimeter Galaxies and QSOs at High Redshift

Published online by Cambridge University Press:  01 August 2006

Yu Gao ,
C.L. Carilli ,
P.M. Solomon  and
P.A. Vanden Bout
Yu Gao
Affiliation:
Purple Mountain Observatory, 2 West Beijing Road, Nanjing 210008; and National Astronomy Observatory, Chinese Academy of Sciences, Beijing, P.R. [email protected], [email protected] National Radio Astronomy Observatory, Socorro, NM 87801, USA
C.L. Carilli
Affiliation:
National Radio Astronomy Observatory, Socorro, NM 87801, USA
P.M. Solomon
Affiliation:
Department of Physics & Astronomy, SUNY at Stony Brook, Stony Brook, NY 11794, USA
P.A. Vanden Bout
Affiliation:
National Radio Astronomy Observatory, Charlottesville, VA 22903, USA
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We have conducted sensitive HCN(1-0) line observations of four high redshift submillimeter (sub-mm) galaxies and QSOs with the VLA. Although none is significantly detected in either line or continuum emission, thanks to the gravitational lens, sub-mm galaxy SMM J16359+6612 is marginally (at the 3-4σ level) detected once the three lensed components are stacked up. The HCN source appears to be double with a separation of ~1.5'', consistent with what has been implied from other observations. This first possible HCN detection of a submm galaxy, and three stringent HCN upper limits, combined with previous HCN detections and upper limits strongly constrain the HCN/CO ratios at high-z to be comparable to that of local ULIRGs.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S235: Galaxy Evolution Across the Hubble Time , August 2006 , pp. 403
Copyright
Copyright © International Astronomical Union 2007