Herschel-ATLAS: correlations between dust and gas in local submm-selected galaxies

被引：28

作者：

Bourne, N. ^{[1
]}

Dunne, L. ^{[2
]}

Bendo, G. J. ^{[3
]}

Smith, M. W. L. ^{[4
]}

Clark, C. J. R. ^{[4
]}

Smith, D. J. B. ^{[5
]}

Rigby, E. E. ^{[6
]}

Baes, M. ^{[7
]}

Leeuw, L. L. ^{[8
]}

Maddox, S. J. ^{[2
]}

Thompson, M. A. ^{[5
]}

Bremer, M. N. ^{[9
]}

Cooray, A. ^{[10
]}

Dariush, A. ^{[11
]}

de Zotti, G. ^{[12
,13
]}

Dye, S. ^{[1
]}

Eales, S. ^{[4
]}

Hopwood, R. ^{[14
,15
]}

Ibar, E. ^{[16
]}

Ivison, R. J. ^{[17
]}

Jarvis, M. J. ^{[18
,19
]}

Michalowski, M. J. ^{[7
,20
]}

Rowlands, K. ^{[1
]}

Valiante, E. ^{[4
]}

机构：

[1] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England

[2] Univ Canterbury, Dept Phys & Astron, Christchurch 8140, New Zealand

[3] Univ Manchester, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England

[4] Cardiff Univ, Sch Phys & Astron, Cardiff CF24 3AA, S Glam, Wales

[5] Univ Hertfordshire, STRI, Ctr Astrophys Res, Hatfield AL10 9AB, Herts, England

[6] Leiden Observ, NL-2300 RA Leiden, Netherlands

[7] Univ Ghent, Steward Observ, B-9000 Ghent, Belgium

[8] Univ South Africa, Coll Grad Studies, ZA-003 Unisa, South Africa

[9] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England

[10] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA

[11] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England

[12] Osserv Astron Padova, INAF, I-35122 Padua, Italy

[13] SISSA, I-34136 Trieste, Italy

[14] Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2AZ, England

[15] Open Univ, Dept Phys Sci, Milton Keynes MK7 6AA, Bucks, England

[16] Pontificia Univ Catolica Chile, Fac Fis, Inst Astrofis, Santiago 22, Chile

[17] Royal Observ, UK Astron Technol Ctr, Edinburgh EH9 3HJ, Midlothian, Scotland

[18] Univ Oxford, Dept Phys, Oxford OX1 3RH, England

[19] Univ Western Cape, Dept Phys, ZA-7535 Bellville, South Africa

[20] Univ Edinburgh, Royal Observ, Inst Astron, SUPA, Edinburgh EH9 3HJ, Midlothian, Scotland

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2013年 / 436卷 / 01期

基金：

美国国家航空航天局;

关键词：

galaxies: ISM; infrared: galaxies; radio lines: galaxies; submillimetre: galaxies; STAR-FORMATION RATE; ALL-SKY-SURVEY; SPECTRAL ENERGY-DISTRIBUTIONS; MOLECULAR GAS; NEARBY GALAXIES; INFRARED-EMISSION; COLD DUST; CONVERSION FACTOR; LEGACY SURVEY; DATA RELEASE;

D O I：

10.1093/mnras/stt1584

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present an analysis of CO molecular gas tracers in a sample of 500 mu m-selected Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) galaxies at z < 0.05 (cz < 14990 km s(-1)). Using 22-500 mu m photometry from Wide-Field Infrared Survey Explorer, Infrared Astronomical Satellite and Herschel, with HI data from the literature, we investigate correlations between warm and cold dust, and tracers of the gas in different phases. The correlation between global CO(3-2) line fluxes and far-infrared (FIR)-submillimetre (submm) fluxes weakens with increasing infrared wavelength (lambda greater than or similar to 60 mu m), as a result of colder dust being less strongly associated with dense gas. Conversely, CO(2-1) and HI line fluxes both appear to be better correlated with longer wavelengths, suggesting that cold dust is more strongly associated with diffuse atomic and molecular gas phases, consistent with it being at least partially heated by radiation from old stellar populations. The increased scatter at long wavelengths implies that submm fluxes are a poorer tracer of star formation rate (SFR). Fluxes at 22 and 60 mu m are also better correlated with diffuse gas tracers than dense CO(3-2), probably due to very small grain emission in the diffuse interstellar medium, which is not correlated with SFR. The FIR/CO luminosity ratio and the dust mass/CO luminosity ratio both decrease with increasing luminosity, as a result of either correlations between mass and metallicity (changing CO/H-2) or between CO luminosity and excitation [changing CO(3-2)/CO(1-0)].

引用

页码：479 / 502

页数：24

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