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Molecular CO(1-0) gas in the z~2 radio galaxy MRC 0152-209


Emonts, BHC and Feain, I and Mao, MY and Norris, RP and Miley, G and Ekers, RD and Villar-Martin, M and Rottgering, HJA and Sadler, EM and Rees, G and Morganti, R and Saikia, DJ and Oosterloo, TA and Stevens, JB and Tadhunter, CN, Molecular CO(1-0) gas in the z~2 radio galaxy MRC 0152-209, The Astrophysical Journal Letters, 734, (1) EJ ISSN 2041-8205 (2011) [Refereed Article]

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Copyright Statement

Copyright 2010 2011. The American Astronomical Society.

DOI: doi:10.1088/2041-8205/734/1/L25


We report the detection of molecular CO(1-0) gas in the high-z radio galaxy MRC 0152-209 (z = 1.92) with the Australia Telescope Compact Array Broadband Backend (ATCA/CABB). This is the third known detection of CO(1-0) in a high-z radio galaxy to date. CO(1-0) is the most robust tracer of the overall molecular gas content (including the widespread, low-density, and sub-thermally excited component), hence observations of CO(1-0) are crucial for studying galaxy evolution in the early universe. We derive L'CO = 6.6 ㊣ 2.0 ℅ 1010 K km s每1 pc2 for MRC 0152-209, which is comparable to that derived from CO(1-0) observations of several high-z submillimeter and star-forming BzK galaxies. The CO(1-0) traces a total molecular hydrogen mass of $M_{\rm H_2}$ = 5 ℅ 1010 (汐x/0.8) M. MRC 0152-209 is an infrared bright radio galaxy, in which a large reservoir of cold molecular gas has not (yet) been depleted by star formation or radio source feedback. Its compact radio source is reliably detected at 40 GHz and has a steep spectral index of 汐 = 每1.3 between 1.4 and 40 GHz (4-115 GHz in the galaxy's rest frame). MRC 0152-209 is part of an ongoing systematic ATCA/CABB survey of CO(1-0) in high-z radio galaxies between 1.7 < z < 3.

Item Details

Item Type:Refereed Article
Keywords:galaxies: active; galaxies: evolution; galaxies: high-redshift; galaxies: individual (MRC 0152-209); galaxies: ISM; radio lines: ISM
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Cosmology and extragalactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Mao, MY (Miss Minnie Mao)
ID Code:75119
Year Published:2011
Web of Science® Times Cited:25
Deposited By:Mathematics and Physics
Deposited On:2012-01-11
Last Modified:2012-07-17

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