The ALPINE−ALMA [CII] Survey: On the nature of an extremely obscured serendipitous galaxy

M. Romano; P. Cassata; L. Morselli; B. C. Lemaux; M. Béthermin; P. Capak; A. Faisst; O. Le Fèvre; D. Schaerer; J. Silverman; L. Yan; S. Bardelli; M. Boquien; A. Cimatti; M. Dessauges-Zavadsky; A. Enia; Y. Fudamoto; S. Fujimoto; M. Ginolfi; C. Gruppioni; N. P. Hathi; E. Ibar; G. C. Jones; A. M. Koekemoer; F. Loiacono; C. Mancini; D. A. Riechers; G. Rodighiero; L. Rodríguez-Muñoz; M. Talia; L. Vallini; D. Vergani; G. Zamorani; E. Zucca

The ALPINE−ALMA [CII] Survey: On the nature of an extremely obscured serendipitous galaxy

M. Romano, P. Cassata, L. Morselli, B. C. Lemaux, M. Béthermin, P. Capak, A. Faisst, O. Le Fèvre, D. Schaerer, J. Silverman, L. Yan, S. Bardelli, M. Boquien, A. Cimatti, M. Dessauges-Zavadsky, A. Enia, Y. Fudamoto, S. Fujimoto, M. Ginolfi, C. GruppioniN. P. Hathi, E. Ibar, G. C. Jones, A. M. Koekemoer, F. Loiacono, C. Mancini, D. A. Riechers, G. Rodighiero, L. Rodríguez-Muñoz, M. Talia, L. Vallini, D. Vergani, G. Zamorani, E. Zucca

Research output: Contribution to journal › Article › peer-review

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 K_s 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]) ∼ 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.

Original language	English
Journal	Unknown Journal
Publication status	Published - 2020 Feb 3
Externally published	Yes

Keywords

Galaxies: evolution - galaxies: high-redshift

ASJC Scopus subject areas

General

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Romano, M., Cassata, P., Morselli, L., Lemaux, B. C., Béthermin, M., Capak, P., Faisst, A., Le Fèvre, O., Schaerer, D., Silverman, J., Yan, L., Bardelli, S., Boquien, M., Cimatti, A., Dessauges-Zavadsky, M., Enia, A., Fudamoto, Y., Fujimoto, S., Ginolfi, M., ... Zucca, E. (2020). The ALPINE−ALMA [CII] Survey: On the nature of an extremely obscured serendipitous galaxy. Unknown Journal.

The ALPINE−ALMA [CII] Survey : On the nature of an extremely obscured serendipitous galaxy. / Romano, M.; Cassata, P.; Morselli, L.; Lemaux, B. C.; Béthermin, M.; Capak, P.; Faisst, A.; Le Fèvre, 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.; Rodríguez-Muñoz, L.; Talia, M.; Vallini, L.; Vergani, D.; Zamorani, G.; Zucca, E.

In: Unknown Journal, 03.02.2020.

Research output: Contribution to journal › Article › peer-review

Romano, M, Cassata, P, Morselli, L, Lemaux, BC, Béthermin, M, Capak, P, Faisst, A, Le Fèvre, 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, NP, Ibar, E, Jones, GC, Koekemoer, AM, Loiacono, F, Mancini, C, Riechers, DA, Rodighiero, G, Rodríguez-Muñoz, L, Talia, M, Vallini, L, Vergani, D, Zamorani, G & Zucca, E 2020, 'The ALPINE−ALMA [CII] Survey: On the nature of an extremely obscured serendipitous galaxy', Unknown Journal.

Romano, M. ; Cassata, P. ; Morselli, L. ; Lemaux, B. C. ; Béthermin, M. ; Capak, P. ; Faisst, A. ; Le Fèvre, 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. ; Rodríguez-Muñoz, L. ; Talia, M. ; Vallini, L. ; Vergani, D. ; Zamorani, G. ; Zucca, E. / The ALPINE−ALMA [CII] Survey : On the nature of an extremely obscured serendipitous galaxy. In: Unknown Journal. 2020.

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title = "The ALPINE−ALMA [CII] Survey: On the nature of an extremely obscured serendipitous galaxy",

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]/LFIR) ∼ −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 LCO and LFIR 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]) ∼ 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.",

keywords = "Galaxies: evolution - galaxies: high-redshift",

author = "M. Romano and P. Cassata and L. Morselli and Lemaux, {B. C.} and M. B{\'e}thermin and P. Capak and A. Faisst and {Le F{\`e}vre}, O. and D. Schaerer and J. Silverman and L. Yan and S. Bardelli and M. Boquien and A. Cimatti and M. Dessauges-Zavadsky and A. Enia and Y. Fudamoto and S. Fujimoto and M. Ginolfi and C. Gruppioni and Hathi, {N. P.} and E. Ibar and Jones, {G. C.} and Koekemoer, {A. M.} and F. Loiacono and C. Mancini and Riechers, {D. A.} and G. Rodighiero and L. Rodr{\'i}guez-Mu{\~n}oz and M. Talia and L. Vallini and D. Vergani and G. Zamorani and E. Zucca",

year = "2020",

month = feb,

day = "3",

language = "English",

journal = "Nuclear Physics A",

issn = "0375-9474",

publisher = "Elsevier",

}

TY - JOUR

T1 - The ALPINE−ALMA [CII] 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 - Béthermin, M.

AU - Capak, P.

AU - Faisst, A.

AU - Le Fèvre, 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 - Rodríguez-Muñoz, L.

AU - Talia, M.

AU - Vallini, L.

AU - Vergani, D.

AU - Zamorani, G.

AU - Zucca, E.

PY - 2020/2/3

Y1 - 2020/2/3

N2 - 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]/LFIR) ∼ −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 LCO and LFIR 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]) ∼ 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.

AB - 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]/LFIR) ∼ −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 LCO and LFIR 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]) ∼ 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.

KW - Galaxies: evolution - galaxies: high-redshift

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UR - http://www.scopus.com/inward/citedby.url?scp=85095300738&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:85095300738

JO - Nuclear Physics A

JF - Nuclear Physics A

SN - 0375-9474

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