Star formation in CALIFA early-type galaxies: a matter of discs

被引：29

作者：

Mendez-Abreu, J. ^{[1
,2
]}

Sanchez, S. F. ^{[3
]}

de Lorenzo-Caceres, A. ^{[1
,2
]}

机构：

[1] Inst Astrofis Canarias, Calle Via Lactea S-N, E-38205 Tenerife, Spain

[2] Univ La Laguna, Dept Astrofis, E-38200 Tenerife, Spain

[3] Univ Nacl Autonoma Mexico, Inst Astron, AP 70-264, Mexico City 04510, DF, Mexico

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2019年 / 488卷 / 01期

关键词：

galaxies: bulges; galaxies: evolution; galaxies: formation; galaxies: photometry; galaxies: structure; SDSS-IV MANGA; ATLAS(3D) PROJECT; SAURON PROJECT; MOLECULAR GAS; PHYSICAL-PROPERTIES; FORMATION RATES; EVOLUTION; SPECTROSCOPY; MASS; MORPHOLOGY;

D O I：

10.1093/mnrasl/slz103

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The star formation main sequence (SFMS) is a tight relation between the galaxy star formation rate (SFR) and its total stellar mass (M-*). Early-type galaxies (ETGs) are often considered as low-SFR outliers of this relation. We study, for the first time, the separated distribution in the SFR versus M-* of bulges and discs of 49 ETGs from the CALIFA survey. This is achieved using C2D, a new code to perform spectrophotometric decompositions of integral field spectroscopy data cubes. Our results reflect that: (i) star formation always occurs in the disc component and not in bulges; (ii) star-forming discs in our ETGs are compatible with the SFMS defined by star-forming galaxies at z similar to 0; (iii) the star formation is not confined to the outskirts of discs, but it is present at all radii (even where the bulge dominates the light); (iv) for a given mass, bulges exhibit lower sSFR than discs at all radii; and (v) we do not find a deficit of molecular gas in bulges with respect to discs for a given mass in our ETGs. We speculate our results favour a morphological quenching scenario for ETGs.

引用

页码：L80 / L84

页数：5

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