Searching for new OH megamasers out to redshifts z>1

Details Searching for new OH megamasers out to redshifts z>1 Searching for new OH megamasers out to redshifts z>1

2012-04-03

arxiv.org/abs/1204.0788v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages, 1 figure. Submitted to Proceedings of IAU Symposium No. 287 "Cosmic Masers - from OH to H0" (Feb 2012)

Scientific paper

We have carried out a search for 18-cm OH megamaser (OHM) emission with the Green Bank Telescope. The targeted galaxies comprise a sample of 121 ULIRGs at 0.090.25. Nine new detections of OHMs are reported, all at redshifts z<0.25. For the remainder of the galaxies, observations constrain the upper limit on OH emission; this rules out OHMs of moderate brightness (L_OH > 10^3 L_sun) for 26% of the sample, and extremely bright OHM emission (L_OH > 10^4 L_sun) for 73% of the sample. Losses from RFI result in the OHM detection fraction being significantly lower than expected for galaxies with L_IR >10^12 L_sun. The new OHM detections are used to calculate an updated OH luminosity function, with \Phi[L]\simL_OH^{-0.66}; this slope is in agreement with previous results. Non-detections of OHMs in the COSMOS field constrain the predicted sky density of OHMs; the results are consistent with a galaxy merger rate evolving as (1+z)^m, where m<6.

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