Galaxy And Mass Assembly (GAMA): gas fuelling of spiral galaxies in the local Universe II. - direct measurement of the dependencies on redshift and host halo mass of stellar mass growth in central disc galaxies
| Autor: | Lingyu Wang, Meiert W. Grootes, Michael J. I. Brown, Aaron S. G. Robotham, Jochen Liske, R. J. Tuffs, Benne W. Holwerda, Andrej Dvornik, Cristina Popescu, René J. Laureijs |
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| Přispěvatelé: | Systems, Control and Applied Analysis |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
galaxies: spiral
Stellar mass media_common.quotation_subject FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Disc galaxy 01 natural sciences gravitational lensing: weak galaxies: groups: general 0103 physical sciences ACCRETION RATES 100 SQUARE DEGREES MAIN-SEQUENCE 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics COLD FLOWS media_common Physics F990 Spiral galaxy FORMING GALAXIES 010308 nuclear & particles physics Star formation CLOSE PAIRS WEAK LENSING DATA Astronomy and Astrophysics STAR-FORMATION HISTORY Astrophysics - Astrophysics of Galaxies Galaxy Redshift Universe EVOLUTION Space and Planetary Science DARK-MATTER HALOES Astrophysics of Galaxies (astro-ph.GA) Halo Astrophysics::Earth and Planetary Astrophysics intergalactic medium galaxies: evolution galaxies: ISM |
| Zdroj: | Monthly Notices of the Royal Astronomical Society, 477(1), 1015-1034. Oxford University Press Monthly Notices of the Royal Astronomical Society, 477(1), 1015-1034 |
| ISSN: | 0035-8711 1365-2966 |
| Popis: | We present a detailed analysis of the specific star formation rate -- stellar mass ($\mathrm{sSFR}-M_*$) of $z\le 0.13$ disk central galaxies using a morphologically selected mass-complete sample ($M_* \ge 10^{9.5} M_{\odot}$). Considering samples of grouped and ungrouped galaxies, we find the $\mathrm{sSFR}-M_*$ relations of disk-dominated central galaxies to have no detectable dependence on host dark-matter halo (DMH) mass, even where weak-lensing measurements indicate a difference in halo mass of a factor $\gtrsim5$. We further detect a gradual evolution of the $\mathrm{sSFR}-M_*$ relation of non-grouped (field) central disk galaxies with redshift, even over a $\Delta z \approx 0.04$ ($\approx5\cdot10^{8}\mathrm{yr}$) interval, while the scatter remains constant. This evolution is consistent with extrapolation of the "main-sequence-of-star-forming-galaxies" from previous literature that uses larger redshift baselines and coarser sampling. Taken together, our results present new constraints on the paradigm under which the SFR of galaxies is determined by a self-regulated balance between gas inflows and outflows, and consumption of gas by star-formation in disks, with the inflow being determined by the product of the cosmological accretion rate and a fuelling-efficiency -- $\dot{M}_{\mathrm{b,halo}}\zeta$. In particular, maintaining the paradigm requires $\dot{M}_{\mathrm{b,halo}}\zeta$ to be independent of the mass $M_{\mathrm{halo}}$ of the host DMH. Furthermore, it requires the fuelling-efficiency $\zeta$ to have a strong redshift dependence ($\propto (1+z)^{2.7}$ for $M_*=10^{10.3} M_{\odot}$ over $z=0 - 0.13$), even though no morphological transformation to spheroids can be invoked to explain this in our disk-dominated sample. The physical mechanisms capable of giving rise to such dependencies of $\zeta$ on $M_{\mathrm{halo}}$ and $z$ for disks are unclear. Comment: 23 pages, 6 figures, 3 tables. Accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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