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THE ALMA SPECTROSCOPIC SURVEY IN THE HUBBLE ULTRA DEEP FIELD: SEARCH FOR [ ] LINE AND DUST EMISSION IN 6 < z < 8 GALAXIES

The Astrophysical journal, 2016-12, Vol.833 (1), p.71 [Peer Reviewed Journal]

2016. The American Astronomical Society. All rights reserved. ;Copyright IOP Publishing Dec 10, 2016 ;ISSN: 0004-637X ;EISSN: 1538-4357 ;DOI: 10.3847/1538-4357/833/1/71

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Title:
THE ALMA SPECTROSCOPIC SURVEY IN THE HUBBLE ULTRA DEEP FIELD: SEARCH FOR [ ] LINE AND DUST EMISSION IN 6 < z < 8 GALAXIES
Author: Aravena, M. ; Decarli, R. ; Walter, F. ; Bouwens, R. ; Oesch, P. A. ; Carilli, C. L. ; Bauer, F. E. ; Cunha, E. Da ; Daddi, E. ; Gónzalez-López, J. ; Ivison, R. J. ; Riechers, D. A. ; Smail, I. ; Swinbank, A. M. ; Weiss, A. ; Anguita, T. ; Bacon, R. ; Bell, E. ; Bertoldi, F. ; Cortes, P. ; Cox, P. ; Hodge, J. ; Ibar, E. ; Inami, H. ; Infante, L. ; Karim, A. ; Magnelli, B. ; Ota, K. ; Popping, G. ; van der Werf, P. ; Wagg, J. ; Fudamoto, Y.
Subjects: Astronomical models ; Astrophysics ; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ; Candidates ; CARBON ; CARBON MONOXIDE ; Continuum radiation ; COSMIC DUST ; DENSITY ; DETECTION ; Dust ; Dust emission ; EMISSION ; Emissions control ; Emitters ; EXTRAPOLATION ; Frequency ranges ; GALACTIC EVOLUTION ; GALAXIES ; galaxies: evolution ; galaxies: high-redshift ; galaxies: ISM ; galaxies: star formation ; GHZ RANGE 100-1000 ; Hubble deep field ; instrumentation: interferometers ; INTERFEROMETERS ; Local group (astronomy) ; LUMINOSITY ; Optical counterparts (astronomy) ; Polls & surveys ; Radio telescopes ; RED SHIFT ; SENSITIVITY ; Spectroscopy ; STACKS ; Star formation ; STARS ; Stars & galaxies ; Statistical analysis ; submillimeter: galaxies ; UNIVERSE
Is Part Of: The Astrophysical journal, 2016-12, Vol.833 (1), p.71
Description: ABSTRACT We present a search for [C ii] line and dust continuum emission from optical dropout galaxies at z > 6 using ASPECS, our Atacama Large Millimeter submillimeter Array Spectroscopic Survey in the Hubble Ultra-deep Field (UDF). Our observations, which cover the frequency range of 212-272 GHz, encompass approximately the range of 6 < z < 8 for [C ii] line emission and reach a limiting luminosity of L[C ii] ∼ (1.6-2.5) × 108 L . We identify 14 [C ii] line emitting candidates in this redshift range with significances >4.5 , two of which correspond to blind detections with no optical counterparts. At this significance level, our statistical analysis shows that about 60% of our candidates are expected to be spurious. For one of our blindly selected [C ii] line candidates, we tentatively detect the CO(6-5) line in our parallel 3 mm line scan. None of the line candidates are individually detected in the 1.2 mm continuum. A stack of all [C ii] candidates results in a tentative detection with S1.2 mm = 14 5 Jy. This implies a dust-obscured star-formation rate (SFR) of (3 1) M yr−1. We find that the two highest-SFR objects have candidate [C ii] lines with luminosities that are consistent with the low-redshift L[C ii] versus SFR relation. The other candidates have significantly higher [C ii] luminosities than expected from their UV-based SFR. At the current sensitivity, it is unclear whether the majority of these sources are intrinsically bright [C ii] emitters, or spurious sources. If only one of our line candidates was real (a scenario greatly favored by our statistical analysis), we find a source density for [C ii] emitters at 6 < z < 8 that is significantly higher than predicted by current models and some extrapolations from galaxies in the local universe.
Publisher: Philadelphia: The American Astronomical Society
Language: English
Identifier: ISSN: 0004-637X
EISSN: 1538-4357
DOI: 10.3847/1538-4357/833/1/71
Source: Alma/SFX Local Collection

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THE ALMA SPECTROSCOPIC SURVEY IN THE HUBBLE ULTRA DEEP FIELD: SEARCH FOR [ ] LINE AND DUST EMISSION IN 6 < z < 8 GALAXIES

2016. The American Astronomical Society. All rights reserved. ;Copyright IOP Publishing Dec 10, 2016 ;ISSN: 0004-637X ;EISSN: 1538-4357 ;DOI: 10.3847/1538-4357/833/1/71

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