The ALPINE ALMA [C II] Survey: on the nature of an extremely obscured serendipitous galaxy
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The ALPINE ALMA [C II] Survey : on the nature of an extremely obscured serendipitous galaxy. / 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.
In: Monthly Notices of the Royal Astronomical Society, Vol. 496, No. 1, 04.06.2020, p. 875-887.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - The ALPINE ALMA [C II] Survey
T2 - on the nature of an extremely obscured serendipitous galaxy
AU - Romano, M.
AU - Cassata, P.
AU - Morselli, L.
AU - Lemaux, B. C.
AU - Bethermin, M.
AU - Capak, P.
AU - Faisst, A.
AU - Le Fevre, O.
AU - Schaerer, D.
AU - Silverman, J.
AU - Yan, L.
AU - Bardelli, S.
AU - Boquien, M.
AU - Cimatti, A.
AU - Dessauges-Zavadsky, M.
AU - Enia, A.
AU - Fudamoto, Y.
AU - Fujimoto, S.
AU - Ginolfi, M.
AU - Gruppioni, C.
AU - Hathi, N. P.
AU - Ibar, E.
AU - Jones, G. C.
AU - Koekemoer, A. M.
AU - Loiacono, F.
AU - Mancini, C.
AU - Riechers, D. A.
AU - Rodighiero, G.
AU - Rodriguez-Munoz, L.
AU - Talia, M.
AU - Vallini, L.
AU - Vergani, D.
AU - Zamorani, G.
AU - Zucca, E.
PY - 2020/6/4
Y1 - 2020/6/4
N2 - We report the serendipitous discovery of a dust-obscured galaxy observed as part of the Atacama Large Millimeter Array (ALMA) Large Program to INvestigate [C II] at Early times (ALPINE). While this galaxy is detected both in line and continuum emissions in ALMA Band 7, it is completely dark in the observed optical/near-infrared bands and only shows a significant detection in the UltraVISTA K-s band. We discuss the nature of the observed ALMA line, that is [C II] at z similar to 4.6 or high-J CO transitions at z similar to 2.2. In the first case, we find a [C II]/FIR luminosity ratio of log(L-[C II]/L-FIR) similar to -2.5, consistent with the average value for local star-forming galaxies (SFGs). In the second case instead, the source would lie at larger CO luminosities than those expected for local SFGs and high-z submillimetre galaxies. At both redshifts, we derive the star formation rate (SFR) from the ALMA continuum and the physical parameters of the galaxy, such as the stellar mass (M-*), by fitting its spectral energy distribution. Exploiting the results of this work, we believe that our source is a 'main-sequence', dusty SFG at z = 4.6 (i.e. [C II] emitter) with log(SFR/M-circle dot yr(-1)) similar to 1.4 and log(M-*/M-circle dot) similar to 9.9. As a support to this scenario our galaxy, if at this redshift, lies in a massive protocluster recently discovered at z similar to 4.57, at only similar to 1 proper Mpc from its centre. 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 SFR density at the end of the Reionization epoch.
AB - We report the serendipitous discovery of a dust-obscured galaxy observed as part of the Atacama Large Millimeter Array (ALMA) Large Program to INvestigate [C II] at Early times (ALPINE). While this galaxy is detected both in line and continuum emissions in ALMA Band 7, it is completely dark in the observed optical/near-infrared bands and only shows a significant detection in the UltraVISTA K-s band. We discuss the nature of the observed ALMA line, that is [C II] at z similar to 4.6 or high-J CO transitions at z similar to 2.2. In the first case, we find a [C II]/FIR luminosity ratio of log(L-[C II]/L-FIR) similar to -2.5, consistent with the average value for local star-forming galaxies (SFGs). In the second case instead, the source would lie at larger CO luminosities than those expected for local SFGs and high-z submillimetre galaxies. At both redshifts, we derive the star formation rate (SFR) from the ALMA continuum and the physical parameters of the galaxy, such as the stellar mass (M-*), by fitting its spectral energy distribution. Exploiting the results of this work, we believe that our source is a 'main-sequence', dusty SFG at z = 4.6 (i.e. [C II] emitter) with log(SFR/M-circle dot yr(-1)) similar to 1.4 and log(M-*/M-circle dot) similar to 9.9. As a support to this scenario our galaxy, if at this redshift, lies in a massive protocluster recently discovered at z similar to 4.57, at only similar to 1 proper Mpc from its centre. 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 SFR density at the end of the Reionization epoch.
KW - galaxies: evolution
KW - galaxies: high-redshift
KW - FAR-INFRARED SPECTROSCOPY
KW - STAR-FORMING GALAXIES
KW - PHOTOMETRIC REDSHIFTS
KW - SUBMILLIMETER GALAXIES
KW - INTERSTELLAR-MEDIUM
KW - DUST CONTENT
KW - EMISSION
KW - STELLAR
KW - COSMOS
KW - MASS
U2 - 10.1093/mnras/staa1546
DO - 10.1093/mnras/staa1546
M3 - Journal article
VL - 496
SP - 875
EP - 887
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 1
ER -
ID: 271542323