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ALMA Observations of the Host Galaxy of GRB 090423 at z = 8.23: Deep Limits on Obscured Star Formation 630 Million Years after the Big Bang

Berger, E. and Zauderer, B. A. and Chary, R.-R. and Laskar, T. and Chornock, R. and Tanvir, N. R. and Stanway, E. R. and Levan, A. J. and Levesque, E. M. and Davies, J. E. (2014) ALMA Observations of the Host Galaxy of GRB 090423 at z = 8.23: Deep Limits on Obscured Star Formation 630 Million Years after the Big Bang. Astrophysical Journal, 796 (2). Art. No. 96. ISSN 0004-637X.

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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) ≲ 33 μJy and F_ν(3.6 μm) ≲ 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) ≲ 3 × 10^10 L_☉, corresponding to a limit on the obscured star formation rate of SFR_IR ≲ 5 M_☉ yr^–1. For comparison, the limit on the unobscured star formation rate from Hubble Space Telescope rest-frame ultraviolet (UV) observations is SFR_UV ≲ 1 M_☉ yr^–1. We also place a limit on the host galaxy stellar mass of M_* ≲ 5 × 10^7 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 ≳ 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:Article
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URLURL TypeDescription Paper
Berger, E.0000-0002-9392-9681
Chary, R.-R.0000-0001-7583-0621
Laskar, T.0000-0003-1792-2338
Additional Information:© 2014 American Astronomical Society. Received 11 August 2014; accepted for publication 28 September 2014; published 12 November 2014. The Berger GRB group at Harvard is supported in part by the National Science Foundation under grant AST-1107973. This paper makes use of the following ALMA data: ADS/JAO.ALMA#2012.1.00953.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. This work is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. Facilities: ALMA - Atacama Large Millimeter Array, Spitzer (IRAC) - Spitzer Space Telescope satellite
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:galaxies: high-redshift; gamma-ray burst: individual (GRB 090423); radio continuum: galaxies
Record Number:CaltechAUTHORS:20141222-090844084
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Official Citation:ALMA Observations of the Host Galaxy of GRB 090423 at z = 8.23: Deep Limits on Obscured Star Formation 630 Million Years after the Big Bang E. Berger et al. 2014 ApJ 796 96
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:53070
Deposited By: Jason Perez
Deposited On:22 Dec 2014 19:45
Last Modified:22 Mar 2019 00:47

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