CO(1-0) survey of high-z radio galaxies: alignment of molecular halo gas with distant radio sources
We present a CO(1-0) survey for cold molecular gas in a representative sample of 13 high-z radio galaxies (HzRGs) at 1.4
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| Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2014-03, Vol.438 (4), p.2898-2915 |
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| creator | Emonts, B. H. C. Norris, R. P. Feain, I. Mao, M. Y. Ekers, R. D. Miley, G. Seymour, N. Röttgering, H. J. A. Villar-Martín, M. Sadler, E. M. Carilli, C. L. Mahony, E. K. de Breuck, C. Stroe, A. Pentericci, L. van Moorsel, G. A. Drouart, G. Ivison, R. J. Greve, T. R. Humphrey, A. Wylezalek, D. Tadhunter, C. N. |
| description | We present a CO(1-0) survey for cold molecular gas in a representative sample of 13 high-z radio galaxies (HzRGs) at 1.4 |
| doi_str_mv | 10.1093/mnras/stt2398 |
| format | Article |
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K km s−1 pc2. For MRC 0152-209 and MRC 1138-262, part of the CO(1-0) emission coincides with the radio galaxy, while part is spread on scales of tens of kpc and likely associated with galaxy mergers. The molecular gas mass derived for these two systems is M
H2 ∼ 6 × 1010 M (M
H2/
= 0.8). For the remaining three CO-detected sources, the CO(1-0) emission is located in the halo (∼50-kpc) environment. These three HzRGs are among the fainter far-IR emitters in our sample, suggesting that similar reservoirs of cold molecular halo gas may have been missed in earlier studies due to pre-selection of IR-bright sources. In all three cases, the CO(1-0) is aligned along the radio axis and found beyond the brightest radio hotspot, in a region devoid of 4.5 μm emission in Spitzer imaging. The CO(1-0) profiles are broad, with velocity widths of ∼1000-3600 km s−1. We discuss several possible scenarios to explain these halo reservoirs of CO(1-0). Following these results, we complement our CO(1-0) study with detections of extended CO from the literature and find at marginal statistical significance (95 per cent level) that CO in HzRGs is preferentially aligned towards the radio jet axis. For the eight sources in which we do not detect CO(1-0), we set realistic upper limits of
K km s−1 pc2. Our survey reveals a CO(1-0) detection rate of 38 per cent, allowing us to compare the CO(1-0) content of HzRGs with that of other types of high-z galaxies.</description><identifier>ISSN: 0035-8711</identifier><identifier>EISSN: 1365-2966</identifier><identifier>DOI: 10.1093/mnras/stt2398</identifier><language>eng</language><publisher>London: Oxford University Press</publisher><subject>Astronomy ; Emissions ; Gases ; Luminosity ; Space telescopes ; Stars & galaxies</subject><ispartof>Monthly notices of the Royal Astronomical Society, 2014-03, Vol.438 (4), p.2898-2915</ispartof><rights>2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society 2014</rights><rights>Copyright Oxford University Press, UK Mar 11, 2014</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c337t-e2a59373a144b2aaa58ab6bf7c7ea8f1f3853cc19385252c45f11a31611e4d263</citedby><cites>FETCH-LOGICAL-c337t-e2a59373a144b2aaa58ab6bf7c7ea8f1f3853cc19385252c45f11a31611e4d263</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,1603,27922,27923</link.rule.ids><linktorsrc>$$Uhttps://dx.doi.org/10.1093/mnras/stt2398$$EView_record_in_Oxford_University_Press$$FView_record_in_$$GOxford_University_Press</linktorsrc></links><search><creatorcontrib>Emonts, B. H. C.</creatorcontrib><creatorcontrib>Norris, R. P.</creatorcontrib><creatorcontrib>Feain, I.</creatorcontrib><creatorcontrib>Mao, M. Y.</creatorcontrib><creatorcontrib>Ekers, R. D.</creatorcontrib><creatorcontrib>Miley, G.</creatorcontrib><creatorcontrib>Seymour, N.</creatorcontrib><creatorcontrib>Röttgering, H. J. A.</creatorcontrib><creatorcontrib>Villar-Martín, M.</creatorcontrib><creatorcontrib>Sadler, E. M.</creatorcontrib><creatorcontrib>Carilli, C. L.</creatorcontrib><creatorcontrib>Mahony, E. K.</creatorcontrib><creatorcontrib>de Breuck, C.</creatorcontrib><creatorcontrib>Stroe, A.</creatorcontrib><creatorcontrib>Pentericci, L.</creatorcontrib><creatorcontrib>van Moorsel, G. A.</creatorcontrib><creatorcontrib>Drouart, G.</creatorcontrib><creatorcontrib>Ivison, R. J.</creatorcontrib><creatorcontrib>Greve, T. R.</creatorcontrib><creatorcontrib>Humphrey, A.</creatorcontrib><creatorcontrib>Wylezalek, D.</creatorcontrib><creatorcontrib>Tadhunter, C. N.</creatorcontrib><title>CO(1-0) survey of high-z radio galaxies: alignment of molecular halo gas with distant radio sources</title><title>Monthly notices of the Royal Astronomical Society</title><addtitle>Mon. Not. R. Astron. Soc</addtitle><description>We present a CO(1-0) survey for cold molecular gas in a representative sample of 13 high-z radio galaxies (HzRGs) at 1.4 < z < 2.8, using the Australia Telescope Compact Array. We detect CO(1-0) emission associated with five sources: MRC 0114-211, MRC 0152-209, MRC 0156-252, MRC 1138-262 and MRC 2048-272. The CO(1-0) luminosities are in the range
K km s−1 pc2. For MRC 0152-209 and MRC 1138-262, part of the CO(1-0) emission coincides with the radio galaxy, while part is spread on scales of tens of kpc and likely associated with galaxy mergers. The molecular gas mass derived for these two systems is M
H2 ∼ 6 × 1010 M (M
H2/
= 0.8). For the remaining three CO-detected sources, the CO(1-0) emission is located in the halo (∼50-kpc) environment. These three HzRGs are among the fainter far-IR emitters in our sample, suggesting that similar reservoirs of cold molecular halo gas may have been missed in earlier studies due to pre-selection of IR-bright sources. In all three cases, the CO(1-0) is aligned along the radio axis and found beyond the brightest radio hotspot, in a region devoid of 4.5 μm emission in Spitzer imaging. The CO(1-0) profiles are broad, with velocity widths of ∼1000-3600 km s−1. We discuss several possible scenarios to explain these halo reservoirs of CO(1-0). Following these results, we complement our CO(1-0) study with detections of extended CO from the literature and find at marginal statistical significance (95 per cent level) that CO in HzRGs is preferentially aligned towards the radio jet axis. For the eight sources in which we do not detect CO(1-0), we set realistic upper limits of
K km s−1 pc2. Our survey reveals a CO(1-0) detection rate of 38 per cent, allowing us to compare the CO(1-0) content of HzRGs with that of other types of high-z galaxies.</description><subject>Astronomy</subject><subject>Emissions</subject><subject>Gases</subject><subject>Luminosity</subject><subject>Space telescopes</subject><subject>Stars & galaxies</subject><issn>0035-8711</issn><issn>1365-2966</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><recordid>eNqF0DtPwzAUBWALgUQpjOyWWMpg6mvHTsKGKl5SpS4wW7eu06TKo9gJUH49CenOdJbvPnQIuQZ-BzyV86r2GOahbYVMkxMyAakVE6nWp2TCuVQsiQHOyUUIO855JIWeELtYzYDxWxo6_-kOtMloXmxz9kM9boqGbrHE78KFe4plsa0rV7eDqZrS2a5ET3MsBxXoV9HmdFOEFnsyDoem89aFS3KWYRnc1TGn5P3p8W3xwpar59fFw5JZKeOWOYEqlbFEiKK1QESV4Fqvs9jGDpMMMpkoaS2kfQolbKQyAJSgAVy0EVpOyc24d--bj86F1uz6B-r-pAHFBY80h0GxUVnfhOBdZva-qNAfDHAz9Gj-ejTHHns_G33T7f-hv08kdRM</recordid><startdate>20140311</startdate><enddate>20140311</enddate><creator>Emonts, B. H. 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L.</creatorcontrib><creatorcontrib>Mahony, E. K.</creatorcontrib><creatorcontrib>de Breuck, C.</creatorcontrib><creatorcontrib>Stroe, A.</creatorcontrib><creatorcontrib>Pentericci, L.</creatorcontrib><creatorcontrib>van Moorsel, G. A.</creatorcontrib><creatorcontrib>Drouart, G.</creatorcontrib><creatorcontrib>Ivison, R. J.</creatorcontrib><creatorcontrib>Greve, T. R.</creatorcontrib><creatorcontrib>Humphrey, A.</creatorcontrib><creatorcontrib>Wylezalek, D.</creatorcontrib><creatorcontrib>Tadhunter, C. N.</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Monthly notices of the Royal Astronomical Society</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Emonts, B. H. C.</au><au>Norris, R. P.</au><au>Feain, I.</au><au>Mao, M. Y.</au><au>Ekers, R. D.</au><au>Miley, G.</au><au>Seymour, N.</au><au>Röttgering, H. J. A.</au><au>Villar-Martín, M.</au><au>Sadler, E. M.</au><au>Carilli, C. L.</au><au>Mahony, E. K.</au><au>de Breuck, C.</au><au>Stroe, A.</au><au>Pentericci, L.</au><au>van Moorsel, G. A.</au><au>Drouart, G.</au><au>Ivison, R. J.</au><au>Greve, T. R.</au><au>Humphrey, A.</au><au>Wylezalek, D.</au><au>Tadhunter, C. N.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>CO(1-0) survey of high-z radio galaxies: alignment of molecular halo gas with distant radio sources</atitle><jtitle>Monthly notices of the Royal Astronomical Society</jtitle><stitle>Mon. Not. R. Astron. Soc</stitle><date>2014-03-11</date><risdate>2014</risdate><volume>438</volume><issue>4</issue><spage>2898</spage><epage>2915</epage><pages>2898-2915</pages><issn>0035-8711</issn><eissn>1365-2966</eissn><abstract>We present a CO(1-0) survey for cold molecular gas in a representative sample of 13 high-z radio galaxies (HzRGs) at 1.4 < z < 2.8, using the Australia Telescope Compact Array. We detect CO(1-0) emission associated with five sources: MRC 0114-211, MRC 0152-209, MRC 0156-252, MRC 1138-262 and MRC 2048-272. The CO(1-0) luminosities are in the range
K km s−1 pc2. For MRC 0152-209 and MRC 1138-262, part of the CO(1-0) emission coincides with the radio galaxy, while part is spread on scales of tens of kpc and likely associated with galaxy mergers. The molecular gas mass derived for these two systems is M
H2 ∼ 6 × 1010 M (M
H2/
= 0.8). For the remaining three CO-detected sources, the CO(1-0) emission is located in the halo (∼50-kpc) environment. These three HzRGs are among the fainter far-IR emitters in our sample, suggesting that similar reservoirs of cold molecular halo gas may have been missed in earlier studies due to pre-selection of IR-bright sources. In all three cases, the CO(1-0) is aligned along the radio axis and found beyond the brightest radio hotspot, in a region devoid of 4.5 μm emission in Spitzer imaging. The CO(1-0) profiles are broad, with velocity widths of ∼1000-3600 km s−1. We discuss several possible scenarios to explain these halo reservoirs of CO(1-0). Following these results, we complement our CO(1-0) study with detections of extended CO from the literature and find at marginal statistical significance (95 per cent level) that CO in HzRGs is preferentially aligned towards the radio jet axis. For the eight sources in which we do not detect CO(1-0), we set realistic upper limits of
K km s−1 pc2. Our survey reveals a CO(1-0) detection rate of 38 per cent, allowing us to compare the CO(1-0) content of HzRGs with that of other types of high-z galaxies.</abstract><cop>London</cop><pub>Oxford University Press</pub><doi>10.1093/mnras/stt2398</doi><tpages>18</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Astronomy Emissions Gases Luminosity Space telescopes Stars & galaxies |
| title | CO(1-0) survey of high-z radio galaxies: alignment of molecular halo gas with distant radio sources |
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