TY - JOUR

T1 - HerMES: The Rest-frame UV Emission and a Lensing Model for the z = 6.34 Luminous Dusty Starburst Galaxy HFLS3

AU - Cooray, Asantha

AU - Calanog, Jae

AU - Wardlow, Julie L.

AU - Bock, J.

AU - Bridge, C.

AU - Burgarella, D.

AU - Bussmann, R. S.

AU - Casey, C. M.

AU - Clements, D.

AU - Conley, A.

AU - Farrah, D.

AU - Fu, H.

AU - Gavazzi, R.

AU - Ivison, R. J.

AU - La Porte, N.

AU - Lo Faro, B.

AU - Ma, Brian

AU - Magdis, G.

AU - Oliver, S. J.

AU - Osage, W. A.

AU - Pérez-Fournon, I.

AU - Riechers, D.

AU - Rigopoulou, D.

AU - Scott, Douglas

AU - Viero, M.

AU - Watson, D.

PY - 2014/7/1

Y1 - 2014/7/1

N2 - 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.

AB - 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.

KW - galaxies: high-redshift

KW - galaxies: starburst

KW - gravitational lensing: strong

KW - infrared: galaxies

KW - submillimeter: galaxies

U2 - 10.1088/0004-637X/790/1/40

DO - 10.1088/0004-637X/790/1/40

M3 - Journal article

VL - 790

SP - 40

JO - The Astrophysical Journal

JF - The Astrophysical Journal

SN - 0004-637X

IS - 1

ER -