Stellar masses and star formation rates of lensed, dusty, star-forming galaxies from the SPT survey
To understand cosmic mass assembly in the universe at early epochs, we primarily rely on measurements of the stellar masses and star formation rates (SFRs) of distant galaxies. In this paper, we present stellar masses and SFRs of six high-redshift (2.8 ≤ z ≤ 5.7) dusty, star-forming galaxies (DSFGs)...
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ftcdlib:oai:escholarship.org/ark:/13030/qt21n4d5h5 2023-05-15T18:23:10+02:00 Stellar masses and star formation rates of lensed, dusty, star-forming galaxies from the SPT survey Ma, J Gonzalez, AH Spilker, JS Strandet, M Ashby, MLN Aravena, M Béthermin, M Bothwell, MS Breuck, CD Brodwin, M Chapman, SC Fassnacht, CD Greve, TR Gullberg, B Hezaveh, Y Malkan, M Marrone, DP Saliwanchik, BR Vieira, JD Weiss, A Welikala, N 88 - 88 2015-10-10 application/pdf https://escholarship.org/uc/item/21n4d5h5 unknown eScholarship, University of California qt21n4d5h5 https://escholarship.org/uc/item/21n4d5h5 public Astrophysical Journal, vol 812, iss 1 galaxies: high-redshift astro-ph.GA Astronomical and Space Sciences Atomic Molecular Nuclear Particle and Plasma Physics Physical Chemistry Astronomy & Astrophysics Physical Chemistry (incl. Structural) article 2015 ftcdlib 2021-06-21T17:05:37Z To understand cosmic mass assembly in the universe at early epochs, we primarily rely on measurements of the stellar masses and star formation rates (SFRs) of distant galaxies. In this paper, we present stellar masses and SFRs of six high-redshift (2.8 ≤ z ≤ 5.7) dusty, star-forming galaxies (DSFGs) that are strongly gravitationally lensed by foreground galaxies. These sources were first discovered by the South Pole Telescope (SPT) at millimeter wavelengths and all have spectroscopic redshifts and robust lens models derived from Atacama Large Millimeter/submillimeter Array observations. We have conducted follow-up observations to obtain multi-wavelength imaging data using the Hubble Space Telescope (HST), Spitzer, Herschel, and the Atacama Pathfinder EXperiment. We use the high-resolution HST/Wide Field Camera 3 images to disentangle the background source from the foreground lens in Spitzer/IRAC data. The detections and upper limits provide important constraints on the spectral energy distributions (SEDs) for these DSFGs, yielding stellar masses, IR luminosities, and SFRs. The SED fits of six SPT sources show that the intrinsic stellar masses span a range more than one order of magnitude with a median value ∼5 ×1010 Mo. The intrinsic IR luminosities range from 4 × 1012 Lo to 4 × 1013 Lo. They all have prodigious intrinsic SFRs of 510-4800 Mo yr-1. Compared to the star-forming main sequence (MS), these six DSFGs have specific SFRs that all lie above the MS, including two galaxies that are a factor of 10 higher than the MS. Our results suggest that we are witnessing ongoing strong starburst events that may be driven by major mergers. Article in Journal/Newspaper South pole University of California: eScholarship Hubble ENVELOPE(158.317,158.317,-80.867,-80.867) South Pole |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
galaxies: high-redshift astro-ph.GA Astronomical and Space Sciences Atomic Molecular Nuclear Particle and Plasma Physics Physical Chemistry Astronomy & Astrophysics Physical Chemistry (incl. Structural) |
spellingShingle |
galaxies: high-redshift astro-ph.GA Astronomical and Space Sciences Atomic Molecular Nuclear Particle and Plasma Physics Physical Chemistry Astronomy & Astrophysics Physical Chemistry (incl. Structural) Ma, J Gonzalez, AH Spilker, JS Strandet, M Ashby, MLN Aravena, M Béthermin, M Bothwell, MS Breuck, CD Brodwin, M Chapman, SC Fassnacht, CD Greve, TR Gullberg, B Hezaveh, Y Malkan, M Marrone, DP Saliwanchik, BR Vieira, JD Weiss, A Welikala, N Stellar masses and star formation rates of lensed, dusty, star-forming galaxies from the SPT survey |
topic_facet |
galaxies: high-redshift astro-ph.GA Astronomical and Space Sciences Atomic Molecular Nuclear Particle and Plasma Physics Physical Chemistry Astronomy & Astrophysics Physical Chemistry (incl. Structural) |
description |
To understand cosmic mass assembly in the universe at early epochs, we primarily rely on measurements of the stellar masses and star formation rates (SFRs) of distant galaxies. In this paper, we present stellar masses and SFRs of six high-redshift (2.8 ≤ z ≤ 5.7) dusty, star-forming galaxies (DSFGs) that are strongly gravitationally lensed by foreground galaxies. These sources were first discovered by the South Pole Telescope (SPT) at millimeter wavelengths and all have spectroscopic redshifts and robust lens models derived from Atacama Large Millimeter/submillimeter Array observations. We have conducted follow-up observations to obtain multi-wavelength imaging data using the Hubble Space Telescope (HST), Spitzer, Herschel, and the Atacama Pathfinder EXperiment. We use the high-resolution HST/Wide Field Camera 3 images to disentangle the background source from the foreground lens in Spitzer/IRAC data. The detections and upper limits provide important constraints on the spectral energy distributions (SEDs) for these DSFGs, yielding stellar masses, IR luminosities, and SFRs. The SED fits of six SPT sources show that the intrinsic stellar masses span a range more than one order of magnitude with a median value ∼5 ×1010 Mo. The intrinsic IR luminosities range from 4 × 1012 Lo to 4 × 1013 Lo. They all have prodigious intrinsic SFRs of 510-4800 Mo yr-1. Compared to the star-forming main sequence (MS), these six DSFGs have specific SFRs that all lie above the MS, including two galaxies that are a factor of 10 higher than the MS. Our results suggest that we are witnessing ongoing strong starburst events that may be driven by major mergers. |
format |
Article in Journal/Newspaper |
author |
Ma, J Gonzalez, AH Spilker, JS Strandet, M Ashby, MLN Aravena, M Béthermin, M Bothwell, MS Breuck, CD Brodwin, M Chapman, SC Fassnacht, CD Greve, TR Gullberg, B Hezaveh, Y Malkan, M Marrone, DP Saliwanchik, BR Vieira, JD Weiss, A Welikala, N |
author_facet |
Ma, J Gonzalez, AH Spilker, JS Strandet, M Ashby, MLN Aravena, M Béthermin, M Bothwell, MS Breuck, CD Brodwin, M Chapman, SC Fassnacht, CD Greve, TR Gullberg, B Hezaveh, Y Malkan, M Marrone, DP Saliwanchik, BR Vieira, JD Weiss, A Welikala, N |
author_sort |
Ma, J |
title |
Stellar masses and star formation rates of lensed, dusty, star-forming galaxies from the SPT survey |
title_short |
Stellar masses and star formation rates of lensed, dusty, star-forming galaxies from the SPT survey |
title_full |
Stellar masses and star formation rates of lensed, dusty, star-forming galaxies from the SPT survey |
title_fullStr |
Stellar masses and star formation rates of lensed, dusty, star-forming galaxies from the SPT survey |
title_full_unstemmed |
Stellar masses and star formation rates of lensed, dusty, star-forming galaxies from the SPT survey |
title_sort |
stellar masses and star formation rates of lensed, dusty, star-forming galaxies from the spt survey |
publisher |
eScholarship, University of California |
publishDate |
2015 |
url |
https://escholarship.org/uc/item/21n4d5h5 |
op_coverage |
88 - 88 |
long_lat |
ENVELOPE(158.317,158.317,-80.867,-80.867) |
geographic |
Hubble South Pole |
geographic_facet |
Hubble South Pole |
genre |
South pole |
genre_facet |
South pole |
op_source |
Astrophysical Journal, vol 812, iss 1 |
op_relation |
qt21n4d5h5 https://escholarship.org/uc/item/21n4d5h5 |
op_rights |
public |
_version_ |
1766202651445297152 |