The Library
Alma observations of the host galaxy of 090423 ATz= 8.23 : deep limits on obscured star formation 630 million years after the big bang
Tools
Berger, E., Zauderer, B. A., Chary, R.-R., Laskar, T., Chornock, R., Tanvir, N. R., Stanway, Elizabeth R., Levan, Andrew J., Levesque, E. M. and Davies, J. E. (2014) Alma observations of the host galaxy of 090423 ATz= 8.23 : deep limits on obscured star formation 630 million years after the big bang. The Astrophysical Journal, Volume 796 (Number 2). Article number 96. doi:10.1088/0004-637X/796/2/96 ISSN 0004-637X.
Research output not available from this repository.
Request-a-Copy directly from author or use local Library Get it For Me service.
Official URL: http://dx.doi.org/10.1088/0004-637X/796/2/96
Abstract
We present rest-frame far-infrared (FIR) and optical observations of the host galaxy of GRB 090423 at z = 8.23 from the Atacama Large Millimeter Array (ALMA) and the Spitzer Space Telescope, respectively. The host remains undetected to 3σ limits of F ν(222 GHz) lsim 33 μJy and F ν(3.6 μm) lsim 81 nJy. The FIR limit is about 20 times fainter than the luminosity of the local ULIRG Arp 220 and comparable to the local starburst M 82. Comparing this with model spectral energy distributions, we place a limit on the infrared (IR) luminosity of L IR(8-1000 μm) lsim 3 × 1010 L ☉, corresponding to a limit on the obscured star formation rate of ${\rm SFR_{\rm IR}} \lesssim 5$ M ☉ yr–1. For comparison, the limit on the unobscured star formation rate from Hubble Space Telescope rest-frame ultraviolet (UV) observations is SFRUV lsim 1 M ☉ yr–1. We also place a limit on the host galaxy stellar mass of M * lsim 5 × 107 M ☉ (for a stellar population age of 100 Myr and constant star formation rate). Finally, we compare our millimeter observations to those of field galaxies at z gsim 4 (Lyman break galaxies, Lyα emitters, and submillimeter galaxies) and find that our limit on the FIR luminosity is the most constraining to date, although the field galaxies have much larger rest-frame UV/optical luminosities than the host of GRB 090423 by virtue of their selection techniques. We conclude that GRB host galaxies at z gsim 4, especially those with measured interstellar medium metallicities from afterglow spectroscopy, are an attractive sample for future ALMA studies of high redshift obscured star formation.
Item Type: | Journal Article | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||
Journal or Publication Title: | The Astrophysical Journal | ||||||||||
Publisher: | Institute of Physics Publishing, Inc. | ||||||||||
ISSN: | 0004-637X | ||||||||||
Official Date: | 1 December 2014 | ||||||||||
Dates: |
|
||||||||||
Volume: | Volume 796 | ||||||||||
Number: | Number 2 | ||||||||||
Article Number: | Article number 96 | ||||||||||
DOI: | 10.1088/0004-637X/796/2/96 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Restricted or Subscription Access |
Request changes or add full text files to a record
Repository staff actions (login required)
View Item |