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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 660603.0, MPI für Astronomie / Publikationen_mpia
[C II] line emission in massive star-forming galaxies at z = 4.7
Authors:Wagg, J.; Wiklind, T.; Carilli, C. L.; Espada, D.; Peck, A.; Riechers, D.; Walter, F.; Wootten, A.; Aravena, M.; Barkats, D.; Cortes, J. R.; Hills, R.; Hodge, J.; Impellizzeri, C. M. V.; Iono, D.; Leroy, A.; Martín, S.; Rawlings, M. G.; Maiolino, R.; McMahon, R. G.; Scott, K. S.; Villard, E.; Vlahakis, C.
Date of Publication (YYYY-MM-DD):2012
Journal Abbrev.:The Astrophysical Journal Letters
Issue / Number:2
Start Page:id. L30
Audience:Not Specified
Abstract / Description: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 1013 L &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 [C II] = (10.0 ± 1.5) × 109 L &sun; and L [C II] = (6.5 ± 1.0) × 109 L &sun;, respectively. We estimate a luminosity ratio L [C II]/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 340 GHz = 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.
Free Keywords:cosmology: observations; early universe; galaxies: evolution; galaxies: formation; galaxies: high-redshift
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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