OliverHermes0004-637X_790_1_40.pdf (556.45 kB)
HerMES: the rest-frame UV emission and a lensing model for the z= 6.34 luminous dusty starburst galaxy HFLS3
journal contribution
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 WatsonWe 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 JournalISSN
0004-637XPublisher
American Astronomical SocietyExternal DOI
Issue
1Volume
790Page range
40-50Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2014-09-10First Open Access (FOA) Date
2014-09-10First Compliant Deposit (FCD) Date
2014-09-10Usage metrics
Categories
No categories selectedKeywords
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC