High Dense Gas Fraction in Intensely Star-forming Dusty Galaxies
Oteo, I.1,2; Zhang, Z-Y.1,2; Yang, C.3,4,5,6,7; Ivison, R. J.1,2; Omont, A.6,7; Bremer, M.8; Bussmann, S.1,2; Cooray, A.9; Cox, P.10; Dannerbauer, H.11,12; Dunne, L.1,13; Eales, S.13; Furlanetto, C.14; Gavazzi, R.15; Gao, Y.16; Greve, T. R.17; Nayyeri, H.9; Negrello, M.13; Neri, R.18; Riechers, D.19; Tunnard, R.17; Wagg, J.20; Van der Werf, P.21
Corresponding AuthorOteo, I.(
AbstractWe present ALMA J = 3-2 and VLA J = 1-0 observations of the dense molecular gas tracers HCN, HCO+, and HNC in two lensed, high-redshift starbursts selected from the Herschel-ATLAS survey: H-ATLAS J090740.0 -004200 (SDP.9, z(spec) = 1.575) and H-ATLAS J091043.1-000321 (SDP.11, z(spec) = 1.786). In SDP.9 we have detected all J = 3-2 transitions and also HCN(1-0) and HCO+(1-0). In SDP.11 we have detected HCN(3-2) and HCO+(3-2). The amplification factors for both galaxies have been determined from subarcsecond-resolution CO and dust emission observations carried out with NOEMA and the SMA. The HNC(1-0)/HCN(1-0) line ratio in SDP.9 suggests the presence of photon-dominated regions, as happens in most local (U)LIRGs. The CO, HCN, and HCO+ spectral line energy distribution (SLEDs) of SDP. 9 are compatible to those found for many local, IR-bright galaxies, indicating that the molecular gas in local and high-redshift dusty starbursts can have similar excitation conditions. We obtain that the correlation between total IR (L-IR) and dense line (L-dense) luminosity in SDP.9 and SDP.11 and local star-forming galaxies can be represented by a single relation. We argue that the scatter of the L-IR-L-dense correlation, together with the lack of sensitive dense molecular gas tracer observations for a homogeneous sample of high-redshift galaxies, prevents us from distinguishing differential trends with redshift. Our results suggest that the intense star formation found in some high-redshift, dusty, luminous starbursts is associated with more massive dense molecular gas reservoirs and higher dense molecular gas fractions.
Keywordgalaxies: high-redshift galaxies: ISM galaxies: starburst galaxies: star formation
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000425472400004
Citation statistics
Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorOteo, I.
Affiliation1.Univ Edinburgh, Inst Astron, Royal Observ, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland
2.European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany
3.Chinese Acad Sci, Key Lab Radio Astron, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
4.Univ Paris Saclay, Univ Paris Sud, CNRS, Inst Astrophys Spatiale, Bat 121, F-91405 Orsay, France
5.Chinese Acad Sci, Grad Univ, 19A Yuquan Rd, Beijing 10049, Peoples R China
6.Inst Astrophys Paris, UMR 7095, CNRS, F-75014 Paris, France
7.UPMC Univ Paris 06, UMR 7095, Inst Astrophys Paris, F-75014 Paris, France
8.Univ Bristol, HH Wills Phys Lab, Tyndall Ave, Bristol BS8 1TL, Avon, England
9.Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
10.Joint ALMA Observ ESO, Av Alonso Cordova, Santiago 3104, Chile
11.Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain
12.Inst Astrofis Canarias, E-38205 Tenerife, Spain
13.Cardiff Univ, Sch Phys & Astron, Cardiff CF24 3AA, S Glam, Wales
14.Univ Nottingham, Sch Phys & Astron, Univ Pk, Nottingham NG7 2RD, England
15.Univ Paris 06, CNRS, UMR7095, Inst Astrophys Paris, 98bis Bd Arago, F-75014 Paris, France
16.Key Lab Radio Astron, Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
17.UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England
18.IRAM, 300 Rue Piscine, F-38406 St Martin Dheres, France
19.Cornell Univ, Dept Astron, Space Sci Bldg, Ithaca, NY 14853 USA
20.SKA Org, Lower Withington Maccles SK11 9DL, Cheshire, England
21.Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands
Recommended Citation
GB/T 7714
Oteo, I.,Zhang, Z-Y.,Yang, C.,et al. High Dense Gas Fraction in Intensely Star-forming Dusty Galaxies[J]. ASTROPHYSICAL JOURNAL,2017,850(2):10.
APA Oteo, I..,Zhang, Z-Y..,Yang, C..,Ivison, R. J..,Omont, A..,...&Van der Werf, P..(2017).High Dense Gas Fraction in Intensely Star-forming Dusty Galaxies.ASTROPHYSICAL JOURNAL,850(2),10.
MLA Oteo, I.,et al."High Dense Gas Fraction in Intensely Star-forming Dusty Galaxies".ASTROPHYSICAL JOURNAL 850.2(2017):10.
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