GRB host galaxies with strong H2 absorption: CO-dark molecular gas at the peak of cosmic star formation
| Autor: | Pall Jakobsson, Lise Christensen, A. de Ugarte Postigo, Jens-Kristian Krogager, Kasper E. Heintz, Marcel Neeleman, C. Ledoux, Francesco Valentino, P. Møller, Pasquier Noterdaeme, Johan P. U. Fynbo, Gunnlaugur Björnsson, Georgios E. Magdis, Patricia Schady, Darach Watson, Tanmoy Laskar |
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| Přispěvatelé: | European Commission, European Research Council, Ministerio de Economía y Competitividad (España), Icelandic Research Fund, Agence Nationale de la Recherche (France), Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Stellar mass
FOS: Physical sciences Astrophysics star formation [Galaxies] 7. Clean energy 01 natural sciences high-redshift [Galaxies] ISM [Galaxies] 0103 physical sciences Absorption (logic) Emission spectrum Spectroscopy 010303 astronomy & astrophysics molecules [ISM] High Energy Astrophysical Phenomena (astro-ph.HE) Physics Galaxies: star formation 010308 nuclear & particles physics Star formation Galaxies: high-redshift Gamma-ray burst: general Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Galaxy Redshift ISM: molecules general [Gamma-ray burst] Galaxies: ISM 13. Climate action Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Gamma-ray burst [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Astrophysics - High Energy Astrophysical Phenomena |
| Zdroj: | Mon.Not.Roy.Astron.Soc. Mon.Not.Roy.Astron.Soc., 2021, 507 (1), pp.1434-1440. ⟨10.1093/mnras/stab2123⟩ Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | We present a pilot search of CO emission in three H2-absorbing, long-duration gamma-ray burst (GRB) host galaxies at z ∼ 2-3. We used the Atacama Large Millimeter/submillimeter Array (ALMA) to target the CO(3 - 2) emission line and report nondetections for all three hosts. These are used to place limits on the host molecular gas masses, assuming a metallicity-dependent CO-to-H2 conversion factor (αCO). We find, Mmol < 3.5 × 1010M⊙ (GRB 080607), Mmol < 4.7 × 1011M⊙ (GRB 120815A), and Mmol [removed]1 with M∗ < 1010M⊙. To better quantify this we develop a simple approach to estimate the relevant αCO factor based only on the redshift and stellar mass of individual galaxies. The elevated conversion factors will make these galaxies appear CO-'dark' and difficult to detect in emission, as is the case for the majority of GRB hosts. GRB spectroscopy thus offers a complementary approach to identify low-metallicity, star-forming galaxies with abundant molecular gas reservoirs at high redshifts that are otherwise missed by current ALMA surveys. © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. KEH and PJ acknowledge support by a Project Grant (162948-051) from The Icelandic Research Fund. MN acknowledges support from ERC Advanced grant 740246 (Cosmic Gas). JPUF thanks the Carlsberg Foundation for support. The Cosmic DAWN Center is funded by the DNRF. PN and JKK acknowledge support from the French Agence Nationale de la Recherche under grant ANR 17-CE31-001101/project `HIH2' (PI: Noterdaeme). This paper makes use of the following ALMA data: ADS/JAO.ALMA#2019.1.00407.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada), MOST and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ. With funding from the Spanish government through the Severo Ochoa Centre of Excellence accreditation SEV-2017-0709. |
| Databáze: | OpenAIRE |
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