SPT 0538-50: Physical conditions in the ISM of a strongly lensed dusty star-forming galaxy at z=2.8

We present observations of SPT-S J053816-5030.8, a gravitationally-lensed dusty star forming galaxy (DSFG) at z = 2.7817, first discovered at millimeter wavelengths by the South Pole Telescope. SPT 0538-50 is typical of the brightest sources found by wide-field millimeter-wavelength surveys, being l...

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Main Authors: Bothwell, M. S., Aguirre, J. E., Chapman, S. C., Marrone, D. P., Vieira, J. D., Ashby, M. L. N., Aravena, M., Benson, B. A., Bock, J. J., Bradford, C. M., Brodwin, M., Carlstrom, J., Crawford, T. M., de Breuck, C., Downes, T. P., Fassnacht, C. D., Gonzalez, A. H., Greve, T. R., Gullberg, B., Hezaveh, Y., Holder, G. P., Holzapfel, W. L., Ibar, E., Ivison, R., Kamenetzky, J., Keisler, R., Lupu, R. E., Ma, J., Malkan, M., McIntyre, V., Murphy, E. J., Nguyen, H. T., Reichardt, C. L., Rosenman, M., Spilker, J. S., Stalder, B., Stark, A. A., Strandet, M., Vernet, J., Weiss, A., Welikala, N.
Format: Text
Language:unknown
Published: arXiv 2013
Subjects:
Cosmology and Nongalactic Astrophysics astro-ph.CO
FOS Physical sciences
South Pole
Hubble
South pole
Online Access:https://dx.doi.org/10.48550/arxiv.1309.3275
https://arxiv.org/abs/1309.3275
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Summary:We present observations of SPT-S J053816-5030.8, a gravitationally-lensed dusty star forming galaxy (DSFG) at z = 2.7817, first discovered at millimeter wavelengths by the South Pole Telescope. SPT 0538-50 is typical of the brightest sources found by wide-field millimeter-wavelength surveys, being lensed by an intervening galaxy at moderate redshift (in this instance, at z = 0.441). We present a wide array of multi-wavelength spectroscopic and photometric data on SPT 0538-50, including data from ALMA, Herschel PACS and SPIRE, Hubble, Spitzer, VLT, ATCA, APEX, and the SMA. We use high resolution imaging from HST to de-blend SPT 0538-50, separating DSFG emission from that of the foreground lens. Combined with a source model derived from ALMA imaging (which suggests a magnification factor of 21 +/- 4), we derive the intrinsic properties of SPT 0538-50, including the stellar mass, far-IR luminosity, star formation rate, molecular gas mass, and - using molecular line fluxes - the excitation conditions within the ISM. The derived physical properties argue that we are witnessing compact, merger-driven star formation in SPT 0538-50, similar to local starburst galaxies, and unlike that seen in some other DSFGs at this epoch. : 16 pages, 11 figures. Accepted for publication in ApJ

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