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Title: [C II] LINE EMISSION IN MASSIVE STAR-FORMING GALAXIES AT z = 4.7

Abstract

We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of the [C II] 157.7 {mu}m 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{sup 13} L{sub Sun} for the two most luminous objects. The SMG and the quasar host galaxy are both detected in [C II] line emission with luminosities L{sub [CII]} = (10.0 {+-} 1.5) Multiplication-Sign 10{sup 9} L{sub Sun} and L{sub [CII]} = (6.5 {+-} 1.0) Multiplication-Sign 10{sup 9} L{sub Sun }, respectively. We estimate a luminosity ratio L{sub [CII]}/L{sub FIR} = (8.3 {+-} 1.2) Multiplication-Sign 10{sup -4} for the starburst SMG to the north and L{sub [CII]}/L{sub FIR} = (2.5 {+-} 0.4) Multiplication-Sign 10{sup -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{sub 340GHz} = 1.9 {+-}more » 0.3 mJy is coincident with a Ly{alpha} 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.« less

Authors:
; ;  [1]; ; ; ; ; ; ; ;  [2];  [3]; ;  [4];  [5];  [6]; ;  [7];  [8];  [9] more »; « less
  1. European Southern Observatory, Casilla 19001, Santiago (Chile)
  2. Joint ALMA Observatory, Alonso de Cordova 3107, Vitacura, Santiago (Chile)
  3. National Radio Astronomy Observatory, Socorro, NM (United States)
  4. National Astronomical Observatory of Japan, Tokyo (Japan)
  5. Department of Astronomy, California Institute of Technology, Pasadena, CA (United States)
  6. Max-Planck Institute for Astronomy, Heidelberg (Germany)
  7. National Radio Astronomy Observatory, Charlottesville, VA (United States)
  8. Cavendish Laboratory, University of Cambridge, Cambridge (United Kingdom)
  9. Institute of Astronomy, University of Cambridge, Cambridge (United Kingdom)
Publication Date:
OSTI Identifier:
22047737
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 752; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; CARBON IONS; COSMOLOGY; EMISSION; FAR INFRARED RADIATION; FINE STRUCTURE; FLUX DENSITY; GALAXIES; IMAGES; LUMINOSITY; PHOTON EMISSION; QUASARS; RED SHIFT; STAR EVOLUTION; STARS; UNIVERSE

Citation Formats

Wagg, J., Aravena, M., Martin, S., Wiklind, T., Peck, A., Barkats, D., Cortes, J. R., Hills, R., Hodge, J., Impellizzeri, C. M V., Rawlings, M. G., Carilli, C. L., Espada, D., Iono, D., Riechers, D., Walter, F., Wootten, A., Leroy, A., Maiolino, R., McMahon, R. G., E-mail: jwagg@eso.org, and and others. [C II] LINE EMISSION IN MASSIVE STAR-FORMING GALAXIES AT z = 4.7. United States: N. p., 2012. Web. doi:10.1088/2041-8205/752/2/L30.
Wagg, J., Aravena, M., Martin, S., Wiklind, T., Peck, A., Barkats, D., Cortes, J. R., Hills, R., Hodge, J., Impellizzeri, C. M V., Rawlings, M. G., Carilli, C. L., Espada, D., Iono, D., Riechers, D., Walter, F., Wootten, A., Leroy, A., Maiolino, R., McMahon, R. G., E-mail: jwagg@eso.org, & and others. [C II] LINE EMISSION IN MASSIVE STAR-FORMING GALAXIES AT z = 4.7. United States. doi:10.1088/2041-8205/752/2/L30.
Wagg, J., Aravena, M., Martin, S., Wiklind, T., Peck, A., Barkats, D., Cortes, J. R., Hills, R., Hodge, J., Impellizzeri, C. M V., Rawlings, M. G., Carilli, C. L., Espada, D., Iono, D., Riechers, D., Walter, F., Wootten, A., Leroy, A., Maiolino, R., McMahon, R. G., E-mail: jwagg@eso.org, and and others. Wed . "[C II] LINE EMISSION IN MASSIVE STAR-FORMING GALAXIES AT z = 4.7". United States. doi:10.1088/2041-8205/752/2/L30.
@article{osti_22047737,
title = {[C II] LINE EMISSION IN MASSIVE STAR-FORMING GALAXIES AT z = 4.7},
author = {Wagg, J. and Aravena, M. and Martin, S. and Wiklind, T. and Peck, A. and Barkats, D. and Cortes, J. R. and Hills, R. and Hodge, J. and Impellizzeri, C. M V. and Rawlings, M. G. and Carilli, C. L. and Espada, D. and Iono, D. and Riechers, D. and Walter, F. and Wootten, A. and Leroy, A. and Maiolino, R. and McMahon, R. G., E-mail: jwagg@eso.org and and others},
abstractNote = {We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of the [C II] 157.7 {mu}m 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{sup 13} L{sub Sun} for the two most luminous objects. The SMG and the quasar host galaxy are both detected in [C II] line emission with luminosities L{sub [CII]} = (10.0 {+-} 1.5) Multiplication-Sign 10{sup 9} L{sub Sun} and L{sub [CII]} = (6.5 {+-} 1.0) Multiplication-Sign 10{sup 9} L{sub Sun }, respectively. We estimate a luminosity ratio L{sub [CII]}/L{sub FIR} = (8.3 {+-} 1.2) Multiplication-Sign 10{sup -4} for the starburst SMG to the north and L{sub [CII]}/L{sub FIR} = (2.5 {+-} 0.4) Multiplication-Sign 10{sup -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{sub 340GHz} = 1.9 {+-} 0.3 mJy is coincident with a Ly{alpha} 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.},
doi = {10.1088/2041-8205/752/2/L30},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 2,
volume = 752,
place = {United States},
year = {2012},
month = {6}
}