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[C II] Line Emission in Massive Star-forming Galaxies at z = 4.7

Wagg, J. and Wiklind, T. and Carilli, C. L. and Espada, D. and Peck, A. and Riechers, D. and Walter, F. and Wootten, A. and Aravena, M. and Barkats, D. and Cortes, J. R. and Hills, R. and Hodge, J. and Impellizzeri, C. M. V. and Iono, D. and Leroy, A. and Martín, S. and Rawlings, M. G. and Maiolino, R. and McMahon, R. G. and Scott, K. S. and Villard, E. and Vlahakis, C. (2012) [C II] Line Emission in Massive Star-forming Galaxies at z = 4.7. Astrophysical Journal Letters, 752 (2). Art. No. L30. ISSN 2041-8205. doi:10.1088/2041-8205/752/2/L30.

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We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of the [C II] 157.7 μm fine structure line and thermal dust continuum emission from a pair of gas-rich galaxies at z = 4.7, BR1202-0725. This system consists of a luminous quasar host galaxy and a bright submillimeter galaxy (SMG), while a fainter star-forming galaxy is also spatially coincident within a 4'' (25 kpc) region. All three galaxies are detected in the submillimeter continuum, indicating FIR luminosities in excess of 10^(13) L_☉ for the two most luminous objects. The SMG and the quasar host galaxy are both detected in [C II] line emission with luminosities L_([CII]) = (10.0 ± 1.5) × 10^9 L_☉ and L_([CII]) = (6.5 ± 1.0) × 10^9 L_☉, respectively. We estimate a luminosity ratio L_([CII])/L_(FIR) = (8.3 ± 1.2) × 10^(–4) for the starburst SMG to the north and L [C II]/L FIR = (2.5 ± 0.4) × 10–4 for the quasar host galaxy, in agreement with previous high-redshift studies that suggest lower [C II]-to-FIR luminosity ratios in quasars than in starburst galaxies. The third fainter object with a flux density S_(340GHz) = 1.9 ± 0.3 mJy is coincident with a Lyα emitter and is detected in HST ACS F775W and F814W images but has no clear counterpart in the H band. Even if this third companion does not lie at a redshift similar to BR1202-0725, the quasar and the SMG represent an overdensity of massive, infrared luminous star-forming galaxies within 1.3 Gyr of the big bang.

Item Type:Article
Related URLs:
URLURL TypeDescription
Carilli, C. L.0000-0001-6647-3861
Riechers, D.0000-0001-9585-1462
Walter, F.0000-0003-4793-7880
Aravena, M.0000-0002-6290-3198
Hodge, J.0000-0001-6586-8845
Iono, D.0000-0002-2364-0823
Leroy, A.0000-0002-2545-1700
Martín, S.0000-0001-9281-2919
Additional Information:© 2012 American Astronomical Society. Received 2012 April 24; accepted 2012 May 16; published 2012 June 4. We thank the referee for helpful suggestions based on the original manuscript. This work was co-funded under the Marie Curie Actions of the European Commission (FP7-COFUND). We thank all those involved in the ALMA project for making these observations possible. This Letter makes use of the following ALMA data: ADS/JAO.ALMA#2011.0.00006.SV. 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. D.R. acknowledges support from NASA through a Spitzer Space Telescope grant. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
Funding AgencyGrant Number
Marie Curie FellowshipUNSPECIFIED
NASA Spitzer Space TelescopeUNSPECIFIED
Subject Keywords: cosmology: observations; early universe; galaxies: evolution; galaxies: formation; galaxies: high-redshift
Issue or Number:2
Record Number:CaltechAUTHORS:20120716-111911487
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Official Citation:[C II] Line Emission in Massive Star-forming Galaxies at z = 4.7 J. Wagg et al. 2012 ApJ 752 L30
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32474
Deposited By: Ruth Sustaita
Deposited On:16 Jul 2012 18:41
Last Modified:09 Nov 2021 21:27

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