Large gas reservoirs and free-free emission in two lensed star-forming galaxies at z=2.7

被引：36

作者：

Aravena, M. ^{[1
]}

Murphy, E. J. ^{[2
]}

Aguirre, J. E. ^{[3
]}

Ashby, M. L. N. ^{[4
]}

Benson, B. A. ^{[5
,6
]}

Bothwell, M. ^{[7
,8
]}

Brodwin, M. ^{[9
]}

Carlstrom, J. E. ^{[5
,6
,10
,11
,12
]}

Chapman, S. C. ^{[13
,14
]}

Crawford, T. M. ^{[5
,11
]}

de Breuck, C. ^{[1
]}

Fassnacht, C. D. ^{[15
]}

Gonzalez, A. H. ^{[16
]}

Greve, T. R. ^{[17
]}

Gullberg, B. ^{[1
]}

Hezaveh, Y. ^{[18
]}

Holder, G. P. ^{[18
]}

Holzapfel, W. L. ^{[19
]}

Keisler, R. ^{[5
]}

Malkan, M. ^{[20
]}

Marrone, D. P. ^{[7
]}

McIntyre, V. ^{[21
]}

Reichardt, C. L. ^{[19
]}

Sharon, K. ^{[5
,11
]}

Spilker, J. S.

Stalder, B. ^{[4
,22
]}

Stark, A. A. ^{[4
]}

Vieira, J. D. ^{[23
]}

Weiss, A. ^{[24
]}

机构：

[1] European So Observ, Casilla, Vitacura Santia, Chile

[2] Observ Carnegie Inst Sci, Pasadena, CA 91101 USA

[3] Univ Penn, Philadelphia, PA 19104 USA

[4] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[5] Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA

[6] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

[7] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[8] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[9] Univ Missouri, Dept Phys & Astron, Kansas City, MO 64110 USA

[10] Univ Chicago, Dept Phys, Chicago, IL 60637 USA

[11] Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA

[12] Argonne Natl Lab, Argonne, IL 60439 USA

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

[14] Dalhousie Univ, Halifax B3H 4R2, NS, Canada

[15] Univ Calif Davis, Dept Phys, Livermore, CA 95616 USA

[16] Univ Florida, Dept Astron, Gainesville, FL 32611 USA

[17] UCL, Dept Phys & Astron, London WC1E 6BT, England

[18] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada

[19] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[20] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[21] CSIRO, Australia Telescope Natl Facil, Epping, NSW 1710, Australia

[22] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

[23] CALTECH, Pasadena, CA 91125 USA

[24] Max Planck Inst Radioastron, D-53121 Bonn, Germany

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2013年 / 433卷 / 01期

基金：

美国国家科学基金会;

关键词：

galaxies: evolution; galaxies: formation; galaxies: high-redshift; galaxies: starburst; cosmology: observations; SOUTH-POLE TELESCOPE; GREEN BANK TELESCOPE; SUBMILLIMETER GALAXIES; MOLECULAR GAS; INFRARED GALAXIES; HIGH-REDSHIFT; COMPACT STARBURSTS; COSMOS FIELD; RADIO; CO;

D O I：

10.1093/mnras/stt741

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the detection of CO(1-0) line emission in the bright, lensed star-forming galaxies SPT-S 233227-5358.5 (z = 2.73) and SPT-S 053816-5030.8 (z = 2.78), using the Australia Telescope Compact Array. Both galaxies were discovered in a large-area millimetre survey with the South Pole Telescope (SPT) and found to be gravitationally lensed by intervening structures. The measured CO intensities imply galaxies with molecular gas masses of (3.2 +/- 0.5) x 10(10)(mu/15)(-1)(X-CO/0.8) and (1.7 +/- 0.3) x 10(10)(mu/20)(-1)(X-CO/0.8) M-circle dot, and gas depletion time-scales of 4.9 x 10(7)(X-CO/0.8) and 2.6 x 10(7)(X-CO/0.8) yr, respectively, where mu corresponds to the lens magnification and X-CO is the CO luminosity to gas mass conversion factor. In the case of SPT-S 053816-5030.8, we also obtained significant detections of the rest-frame 115.7 and 132.4 GHz radio continuum. Based on the radio-to-infrared spectral energy distribution and an assumed synchrotron spectral index, we find that 42 +/- 10 and 55 +/- 13 per cent of the flux at rest-frame 115.7 and 132.4 GHz arises from free-free emission. We find a radio-derived intrinsic star formation rate of 470 +/- 170 M-circle dot yr(-1), consistent within the uncertainties with the infrared estimate. Based on the morphology of this object in the source plane, the derived gas mass and the possible flattening of the radio spectral index towards low frequencies, we argue that SPT-S 053816-5030.8 exhibits properties compatible with a scaled-up local ultraluminous infrared galaxy.

引用

页码：498 / 505

页数：8

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