ALMA reveals the molecular gas properties of 5 star-forming galaxies across the main sequence at 3 < z < 3:5.
| dc.contributor.author | Ibar, Eduardo | |
| dc.date.accessioned | 2021-07-23T16:13:20Z | |
| dc.date.available | 2021-07-23T16:13:20Z | |
| dc.date.issued | 2020 | |
| dc.description.abstract | We present the detection of CO (5−4) with signal-to-noise ratio (S/N) > 7–13 and a lower CO transition with S/N > 3 (CO (4−3) for four galaxies, and CO (3−2) for one) with the Atacama Large Millimeter/submillimeter Array in bands 3 and 4 in five main-sequence (MS) star-forming galaxies with stellar masses (3–6) × 1010M⊙ at 3 < z < 3.5. We find a good correlation between the total far-infrared luminosity LFIR and the luminosity of the CO (5−4) transition ${L}_{\mathrm{CO}(5-4)}^{{\prime} }$, where ${L}_{\mathrm{CO}(5-4)}^{{\prime} }$ increases with star formation rate (SFR), indicating that CO (5−4) is a good tracer of the obscured SFR in these galaxies. The two galaxies that lie closer to the star-forming MS have CO spectral line energy distribution (SLED) slopes that are comparable to other star-forming populations, such as local submillimeter galaxies and BzK star-forming galaxies; the three objects with higher specific star formation rates have far steeper CO SLEDs, which possibly indicates a more concentrated episode of star formation. By exploiting the CO SLED slopes to extrapolate the luminosity of the CO (1−0) transition and using a classical conversion factor for MS galaxies of ${\alpha }_{\mathrm{CO}}=3.8\,{M}_{\odot}{({\rm{K}}\mathrm{km}{{\rm{s}}}^{-1}{\mathrm{pc}}^{-2})}^{-1}$, we find that these galaxies are very gas-rich, with molecular gas fractions between 60% and 80% and quite long depletion times, between 0.2 and 1 Gyr. Finally, we obtain dynamical masses that are comparable to the sum of stellar and gas mass (at least for four out of five galaxies), allowing us to put a first constraint on the αCO parameter for MS galaxies at an unprecedented redshift. | en_ES |
| dc.identifier.doi | https://doi.org/10.3847/1538-4357/ab7452 | |
| dc.identifier.uri | http://repositoriobibliotecas.uv.cl/handle/uvscl/2158 | |
| dc.language.iso | en | en_ES |
| dc.publisher | European Southern Observatory | en_ES |
| dc.source | The Astrophysical Journal | en_ES |
| dc.subject | GALAXIES: ISM | en_ES |
| dc.subject | GALAXIES: STAR FORMATION | en_ES |
| dc.title | ALMA reveals the molecular gas properties of 5 star-forming galaxies across the main sequence at 3 < z < 3:5. | en_ES |
| dc.type | Articulo | en_ES |
| uv.catalogador | RCR DIBRA | en_ES |
| uv.notageneral | Varios autores | en_ES |