The ALPINE-ALMA [CII] Survey: On the nature of an extremely obscured serendipitous galaxy
| dc.contributor.author | Ibar, Eduardo | |
| dc.date.accessioned | 2021-07-23T14:58:45Z | |
| dc.date.available | 2021-07-23T14:58:45Z | |
| dc.date.issued | 2020 | |
| dc.description.abstract | We report the serendipitous discovery of a dust-obscured galaxy observed as part of the Atacama Large Millimeter Array (ALMA) Large Program to INvestigate [CII] 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 Ks band. We discuss the nature of the observed ALMA line, that is [C II] at z ∼ 4.6 or high-J CO transitions at z ∼ 2.2. In the first case, we find a [CII]/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 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. [CII] emitter) with log(SFR/M. yr−1) ~ 1.4 and log(M*/M.) ∼ 9.9. As a support to this scenario our galaxy, if at this redshift, lies in a massive protocluster recently discovered at z ∼ 4.57, at only ∼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 | en_ES |
| dc.identifier.doi | https://doi.org/10.1093/mnras/staa1546 | |
| dc.identifier.uri | http://repositoriobibliotecas.uv.cl/handle/uvscl/2154 | |
| dc.language.iso | en | en_ES |
| dc.publisher | Royal Astronomical Society | en_ES |
| dc.source | Monthly Notices of the Royal Astronomical Society | en_ES |
| dc.subject | GALAXIES: EVOLUTION | en_ES |
| dc.subject | GALAXIES: HIGH-REDSHIFT | en_ES |
| dc.title | The ALPINE-ALMA [CII] Survey: On the nature of an extremely obscured serendipitous galaxy | en_ES |
| dc.type | Articulo | en_ES |
| uv.catalogador | RCR DIBRA | en_ES |
| uv.notageneral | Varios autores | en_ES |