The nebular emission of star-forming galaxies in a hierarchical universe
| Autor: | Ignacio D. Gargiulo, Alvaro Orsi, Sofía A. Cora, Nelson Padilla, Andrés N. Ruiz, T. E. Tecce, Brent Groves |
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| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Ciencias Astronómicas
Cosmology and Nongalactic Astrophysics (astro-ph.CO) Metallicity Ciencias Físicas Astrophysics::High Energy Astrophysical Phenomena Dark matter FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Surveys Luminosity purl.org/becyt/ford/1 [https] Galaxy formation and evolution Emission spectrum Evolution of galaxies Astrophysics::Galaxy Astrophysics Physics High redshift Astronomy Astronomy and Astrophysics purl.org/becyt/ford/1.3 [https] Astrophysics - Astrophysics of Galaxies Galaxy Redshift Interstellar medium Astronomía 13. Climate action Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Numerical methods CIENCIAS NATURALES Y EXACTAS Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Artículos CONICYT CONICYT Chile instacron:CONICYT CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET SEDICI (UNLP) Universidad Nacional de La Plata instacron:UNLP |
| Popis: | Galaxy surveys targeting emission lines are characterizing the evolution of star-forming galaxies, but there is still little theoretical progress in modelling their physical properties. We predict nebular emission from star-forming galaxies within a cosmological galaxy formation model. Emission lines are computed by combining the semi-analytical model SAG with the photoionization code MAPPINGS-III. We characterize the interstellar medium of galaxies by relating the ionization parameter of gas in galaxies to their cold gas metallicity, obtaining a reasonable agreement with the observed Hα, [O II] λ 3727, [O III] λ 5007 luminosity functions, and the BPT diagram for local star-forming galaxies. The average ionization parameter is found to increase towards low star formation rates and high redshifts, consistent with recent observational results. The predicted link between different emission lines and their associated star formation rates is studied by presenting scaling relations to relate them. Our model predicts that emission-line galaxies have modest clustering bias, and thus reside in dark matter haloes of masses below Mhalo ≲ 1012 [h−1 M⊙]. Finally, we exploit our modelling technique to predict galaxy number counts up to z ∼ 10 by targeting far-infrared emission lines detectable with submillimetre facilities. Instituto de Astrofísica de La Plata Facultad de Ciencias Astronómicas y Geofísicas |
| Databáze: | OpenAIRE |
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