Isothermal dust models of Herschel-ATLAS☆ galaxies

被引：48

作者：

Smith, D. J. B. ^{[1
]}

Hardcastle, M. J. ^{[1
]}

Jarvis, M. J. ^{[2
,3
]}

Maddox, S. J. ^{[4
]}

Dunne, L. ^{[4
]}

Bonfield, D. G. ^{[1
]}

Eales, S. ^{[5
]}

Serjeant, S. ^{[6
]}

Thompson, M. A. ^{[1
]}

Baes, M. ^{[7
]}

Clements, D. L. ^{[8
]}

Cooray, A. ^{[9
]}

De Zotti, G. ^{[10
,11
]}

Gonzalez-Nuevo, J. ^{[12
]}

van der Werf, P. ^{[13
]}

Virdee, J. ^{[2
,14
]}

Bourne, N. ^{[15
]}

Dariush, A. ^{[16
]}

Hopwood, R. ^{[6
,8
]}

Ibar, E. ^{[17
,18
]}

Valiante, E. ^{[5
]}

机构：

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

[2] Univ Oxford, Dept Astrophys, Oxford OX1 3RH, England

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

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

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

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

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

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

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

[10] INAF Osservatorio Astron Padova, I-35122 Padua, Italy

[11] SISSA, I-34136 Trieste, Italy

[12] Inst Fis Cantabria CSIC UC, E-39005 Santander, Spain

[13] Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands

[14] Rutherford Appleton Lab, Space Sci & Technol Dept, Didcot OX11 0QX, Oxon, England

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

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

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

[18] Pontificia Univ Catolica Chile, Dept Astron & Astrofis, Santiago, Chile

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2013年 / 436卷 / 03期

关键词：

galaxies: starburst; submillimetre: galaxies; SCIENCE DEMONSTRATION PHASE; FAR-INFRARED PROPERTIES; SPECTRAL ENERGY-DISTRIBUTIONS; DIGITAL SKY SURVEY; CONTINUUM OBSERVATIONS; REDSHIFT DISTRIBUTION; MILLIMETER CONTINUUM; EXTRAGALACTIC SURVEY; PHYSICAL-PROPERTIES; GALACTIC CIRRUS;

D O I：

10.1093/mnras/stt1737

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We use galaxies from the Herschel-ATLAS (H-ATLAS) survey, and a suite of ancillary simulations based on an isothermal dust model, to study our ability to determine the effective dust temperature, luminosity and emissivity index of 250 mu m selected galaxies in the local Universe (z < 0.5). As well as simple far-infrared spectral energy distribution (SED) fitting of individual galaxies based on chi(2) minimization, we attempt to derive the best global isothermal properties of 13 826 galaxies with reliable optical counterparts and spectroscopic redshifts. Using our simulations, we highlight the fact that applying traditional SED fitting techniques to noisy observational data in the Herschel Space Observatory bands introduces artificial anti-correlation between derived values of dust temperature and emissivity index. This is true even for galaxies with the most robust statistical detections in our sample, making the results of such fitting difficult to interpret. We apply a method to determine the best-fitting global values of isothermal effective temperature and emissivity index for z < 0.5 galaxies in H-ATLAS, deriving T-eff = 22.3 +/- 0.1 K and beta = 1.98 +/- 0.02 (or T-eff = 23.5 +/- 0.1 K and beta = 1.82 +/- 0.02 if we attempt to correct for bias by assuming that T-eff and beta(eff) are independent and normally distributed). We use our technique to test for an evolving emissivity index, finding only weak evidence. The median dust luminosity of our sample is log(10)(L-dust/L-circle dot) = 10.72 +/- 0.05, which (unlike T-eff) shows little dependence on the choice of beta used in our analysis, including whether it is variable or fixed. In addition, we use a further suite of simulations based on a fixed emissivity index isothermal model to emphasize the importance of the H-ATLAS PACS data for deriving dust temperatures at these redshifts, even though they are considerably less sensitive than the SPIRE data. Finally, we show that the majority of galaxies detected by H-ATLAS are normal star-forming galaxies, though with a substantial minority (similar to 31 per cent) falling in the Luminous Infrared Galaxy category.

引用

页码：2435 / 2453

页数：19

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