Compact Star-forming Galaxies as Old Starbursts Becoming Quiescent

Autor: Allison W. S. Man, S. Martin-Alvarez, Georgios E. Magdis, M. Stockmann, Sune Toft, K. Tisanić, Carlos Gómez-Guijarro, G. Brammer, D. van der Vlugt, Rob Ivison, Francesco Valentino
Jazyk: angličtina
Rok vydání: 2019
Předmět:
PRIRODNE ZNANOSTI. Fizika. Astronomija i astrofizika
010504 meteorology & atmospheric sciences
Astrophysics::High Energy Astrophysical Phenomena
FOS: Physical sciences
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Compact star
01 natural sciences
high-redshift [Galaxies]
bulges [Galaxies]
ISM [Galaxies]
0103 physical sciences
NATURAL SCIENCES. Physics. Astronomy and Astrophysics
Astrophysics::Solar and Stellar Astrophysics
010303 astronomy & astrophysics
Astrophysics::Galaxy Astrophysics
0105 earth and related environmental sciences
Physics
Astronomy and Astrophysics
evolution [Galaxies]
Astrophysics - Astrophysics of Galaxies
formation [Galaxies]
Galaxy
Space and Planetary Science
galaxies: bulges
galaxies: evolution
galaxies: formation
galaxies: fundamental parameters
galaxies: high-redshift
galaxies: ISM
Astrophysics of Galaxies (astro-ph.GA)
fundamental parameters [Galaxies]
Zdroj: Astrophysical Journal (0004-637X), 886(2), 88
Gómez-Guijarro, C, Magdis, G E, Valentino, F, Toft, S, Man, A W S, Ivison, R J, Tisanić, K, van der Vlugt, D, Stockmann, M, Martin-Alvarez, S & Brammer, G 2019, ' Compact Star-forming Galaxies as Old Starbursts Becoming Quiescent ', Astrophysical Journal Supplement Series, vol. 886, no. 2, 88 . https://doi.org/10.3847/1538-4357/ab418b
The Astrophysical Journal
Astrophysical Journal
Volume 886
Issue 2
ISSN: 0004-637X
1538-4357
0067-0049
1538-3873
0004-6361
DOI: 10.3847/1538-4357/ab418b
Popis: Optically-compact star-forming galaxies (SFGs) have been proposed as immediate progenitors of quiescent galaxies, although their origin and nature are debated. Were they formed in slow secular processes or in rapid merger-driven starbursts? Addressing this question would provide fundamental insight into how quenching occurs. We explore the location of the general population of galaxies with respect to fundamental star-forming and structural relations, identify compact SFGs based on their stellar core densities, and study three diagnostics of the burstiness of star formation: 1) Star formation efficiency, 2) interstellar medium (ISM), and 3) radio emission. The overall distribution of galaxies in the fundamental relations points towards a smooth transition towards quiescence while galaxies grow their stellar cores, although some galaxies suddenly increase their specific star-formation rate when they become compact. From their star formation efficiencies compact and extended SFGs appear similar. In relation to the ISM diagnostic, by studying the CO excitation, the density of the neutral gas, and the strength of the ultraviolet radiation field, compact SFGs resemble galaxies located in the upper envelope of the SFGs main sequence, although yet based on a small sample size. Regarding the radio emission diagnostic we find that galaxies become increasingly compact as the starburst ages, implying that at least some compact SFGs are old starbursts. We suggest that compact SFGs could be starburts winding down and eventually crossing the main sequence towards quiescence.
Accepted by ApJ. 18 pages, 8 figures
Databáze: OpenAIRE
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