A search for H i and OH absorption inz≳ 3 CO emitters

2016/01/08 by S. J. Curran, J. R. Allison, M. T. Whiting +6
Physics and Astronomy · #Absorption (acoustics) #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #Astrophysics and Star Formation Studies #Galaxies: Formation, Evolution, Phenomena #Galaxy #Luminosity #Optics #Physics #Quasar #Radiation #Redshift #astro-ph.CO #astro-ph.GA

paper · pdf · doi:10.1093/mnras/stw089

12 pages, accepted by MNRAS

arxiv created 2016/01/08 · openalex publication_date 2016/02/26 · arxiv updated 2016/03/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We present the results of a survey for H i 21 cm and OH 18 cm absorption in seven strong CO emitters at z ≳ 3. Despite reaching limits comparable to those required to detect 21 cm absorption at lower redshifts, we do not detect either transition in any of the objects searched. We believe that this is due to the high-redshift selection causing all of our targets to have ultraviolet (UV) luminosities above the critical value, where all of the atomic gas in the host galaxy disc is suspected to be ionized. However, not only are all of our targets bright in CO emission, but detection of CO above the critical UV luminosity is generally not uncommon. This suggests that the molecular gas is shielded from the radiation or is physically remote from the source of the continuum emission, as it appears to be from CO observations of high-redshift radio galaxies.

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