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The ALPINE−ALMA [C <scp>ii</scp>] Survey: on the nature of an extremely obscured serendipitous galaxy
- Source :
- Monthly Notices of the Royal Astronomical Society, Monthly Notices of the Royal Astronomical Society, 2020, 496, pp.875-887. ⟨10.1093/mnras/staa1546⟩, Monthly Notices of the Royal Astronomical Society, 496(1), 875-887, Romano, M, Cassata, P, Morselli, L, Lemaux, B C, Bethermin, M, Capak, P, Faisst, A, Le Fevre, O, Schaerer, D, Silverman, J, Yan, L, Bardelli, S, Boquien, M, Cimatti, A, Dessauges-Zavadsky, M, Enia, A, Fudamoto, Y, Fujimoto, S, Ginolfi, M, Gruppioni, C, Hathi, N P, Ibar, E, Jones, G C, Koekemoer, A M, Loiacono, F, Mancini, C, Riechers, D A, Rodighiero, G, Rodriguez-Munoz, L, Talia, M, Vallini, L, Vergani, D, Zamorani, G & Zucca, E 2020, ' The ALPINE ALMA [C II] Survey : on the nature of an extremely obscured serendipitous galaxy ', Monthly Notices of the Royal Astronomical Society, vol. 496, no. 1, pp. 875-887 . https://doi.org/10.1093/mnras/staa1546
- Publication Year :
- 2020
- Publisher :
- Oxford University Press (OUP), 2020.
-
Abstract
- We report the serendipitous discovery of a bright galaxy (Gal-A) observed as part of the ALMA Large Program to INvestigate [CII] at Early times (ALPINE). While this galaxy is detected both in line and continuum emission in ALMA Band 7, it is completely dark in UV/optical filters and only presents a marginal detection in the UltraVISTA Ks band. We discuss the nature of the observed ALMA line, i.e. whether the emission comes from [CII] at z~4.6, or from high-J CO transitions at z~2.2. In the first case we find a [CII]-to-FIR luminosity ratio of log(L_[CII]/L_FIR)=-2.5, consistent with the average value for local star-forming galaxies (SFGs); in the second case, instead, the source would lie outside of the empirical relations between L_CO and L_FIR found in the literature. At both redshifts, we derive the star-formation rate (SFR) from the ALMA continuum, and the stellar mass (M*) by using stellar population synthesis models as input for LePHARE spectral energy distribution (SED) fitting. Exploiting our results, we believe that Gal-A is a Main-Sequence (MS), dusty SFG at z=4.6 (i.e. [CII] emitter) with log(SFR/[M/yr])~1.4 and log(M*/M)~9.7. This work underlines the crucial role of the ALPINE survey in making a census of this class of objects, in order to unveil their contribution to the global star-formation rate density (SFRD) of the Universe at the end of the Reionisation epoch.<br />Comment: 13 pages, 6 figures. Submitted to MNRAS
- Subjects :
- Stellar mass
FOS: Physical sciences
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
MASS
01 natural sciences
Luminosity
Settore FIS/05 - Astronomia e Astrofisica
galaxies: high-redshift
0103 physical sciences
STAR-FORMING GALAXIES
PHOTOMETRIC REDSHIFTS
010303 astronomy & astrophysics
Reionization
evolution [galaxies]
Astrophysics::Galaxy Astrophysics
COSMOS
Physics
galaxies: evolution
SUBMILLIMETER GALAXIES
INTERSTELLAR-MEDIUM
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]
010308 nuclear & particles physics
Star formation
Astronomy and Astrophysics
DUST CONTENT
Atacama Large Millimeter Array
Astrophysics - Astrophysics of Galaxies
Galaxy
Redshift
STELLAR
[SDU]Sciences of the Universe [physics]
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
Spectral energy distribution
Astrophysics::Earth and Planetary Astrophysics
EMISSION
FAR-INFRARED SPECTROSCOPY
high-redshift [galaxies]
Subjects
Details
- ISSN :
- 13652966 and 00358711
- Volume :
- 496
- Database :
- OpenAIRE
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Accession number :
- edsair.doi.dedup.....28b6c63da46606e298e0f0bf35412702