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HerMES: the rest-frame UV emission and a lensing model for the z= 6.34 luminous dusty starburst galaxy HFLS3

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posted on 2023-06-08, 18:15 authored by Asantha Cooray, Jae Calanog, Julie L Wardlow, J Bock, C Bridge, D Burgarella, R S Bussmann, C M Casey, D Clements, A Conley, D Farrah, H Fu, R Gavazzi, R J Ivison, N La Porte, B Lo Faro, Brian Ma, G Magdis, Seb OliverSeb Oliver, W A Osage, I Pérez-Fournon, D Riechers, D Rigopoulou, Douglas Scott, M Viero, D Watson
We discuss the rest-frame ultraviolet emission from the starbursting galaxy HFLS3 at a redshift of 6.34. The galaxy was discovered in Herschel/SPIRE data due to its red color in the submillimeter wavelengths from 250 to 500 µm. Keck/NIRC2 K s -band adaptive optics imaging data showed two potential near-IR counterparts near HFLS3. Previously, the northern galaxy was taken to be in the foreground at z = 2.1, while the southern galaxy was assumed to be HFLS3's near-IR counterpart. The recently acquired Hubble/WFC3 and Advanced Camera for Surveys (ACS) imaging data show conclusively that both optically bright galaxies are in the foreground at z < 6. A new lensing model based on the Hubble imaging data and the millimeter-wave continuum emission yields a magnification factor of 2.2 ± 0.3, with a 95% confidence upper limit on the magnification of 3.5. When corrected for lensing, the instantaneous star formation rate is 1320 M ? yr–1, with the 95% confidence lower limit around 830 M ? yr–1. The dust and stellar masses of HFLS3 from the same spectral energy distribution (SED) models are at the level of 3 × 108 M ? and ~5 × 1010 M ?, respectively, with large systematic uncertainties on assumptions related to the SED model. With Hubble/WFC3 images, we also find diffuse near-IR emission about 0.5 arcsec (~3 kpc) to the southwest of HFLS3 that remains undetected in the ACS imaging data. The emission has a photometric redshift consistent with either z ~ 6 or a dusty galaxy template at z ~ 2.

Funding

Astronomy rolling grant; G0278; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/I000976/1

History

Publication status

  • Published

File Version

  • Published version

Journal

The Astrophysical Journal

ISSN

0004-637X

Publisher

American Astronomical Society

Issue

1

Volume

790

Page range

40-50

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2014-09-10

First Open Access (FOA) Date

2014-09-10

First Compliant Deposit (FCD) Date

2014-09-10

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