We present searches for molecular gas (CO, OH, CS, and NH3) in six GHz Peaked Spectrum (GPS) radio sources. We do not detect gas in any source and place upper limits on the mass of molecular gas which are generally in the range ~10^9 to a few times 10^10 M⊙. These limits are consistent with the following interpretations: (1) GPS sources do not require very dense gas in their hosts, & (2) The GPS sources are unlikely to be confined by dense gas and will evolve to become larger radio sources (Refer to PDF file for exact formulas).

Publication Date



© 2005 The American Astronomical Society. All rights reserved.

We thank the referee for helpful comments. We are grateful to Eli Brinks for help with the OBSERVE file for the VLA observations. The VLA is operated by the National Radio Astronomy Observatory, which is operated by Associated Universities, Inc., under cooperative agreement with the National Science Foundation. This work was supported by a grant from the STScI Collaborative Visitor Fund. IRAM is supported by INSU/CNRS (France),MPG(Germany), and IGN (Spain). This research made use of (1) the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration, and (2) NASA’s Astrophysics Data System Abstract Service.

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Department, Program, or Center

School of Physics and Astronomy (COS)


RIT – Main Campus