SDSS IV MaNGA: Dependence of Global and Spatially Resolved SFR–M? Relations on Galaxy Properties

doi:10.3847/1538-4357/aaa9bc

CORC > 上海天文台 > 中国科学院上海天文台

	SDSS IV MaNGA: Dependence of Global and Spatially Resolved SFR–M? Relations on Galaxy Properties
	Pan,Hsi-An 2; Lin,Lihwai 2; Hsieh,Bau-Ching 2; Sánchez,Sebastián F.3; Ibarra-Medel,Héctor 3; Boquien,Médéric 4; Lacerna,Ivan 5,6; Argudo-Fernández,Maria 4; Bizyaev,Dmitry 7,8; Cano-Díaz,Mariana 3
刊名	The Astrophysical Journal
	2018-02-21
卷号	854 期号:2
关键词	galaxies: evolution galaxies: formation galaxies: star formation
ISSN号	0004-637X
DOI	10.3847/1538-4357/aaa9bc
英文摘要	Abstract The galaxy integrated Hα star formation rate–stellar mass relation, or SFR(global)–M(global) relation, is crucial for understanding star formation history and evolution of galaxies. However, many studies have dealt with SFR using unresolved measurements, which makes it difficult to separate out the contamination from other ionizing sources, such as active galactic nuclei and evolved stars. Using the integral field spectroscopic observations from SDSS-IV MaNGA, we spatially disentangle the contribution from different Hα powering sources for ～1000 galaxies. We find that, when including regions dominated by all ionizing sources in galaxies, the spatially resolved relation between Hα surface density (ΣHα(all)) and stellar mass surface density (Σ(all)) progressively turns over at the high Σ(all) end for increasing M(global) and/or bulge dominance (bulge-to-total light ratio, B/T). This in turn leads to the flattening of the integrated Hα(global)–M(global) relation in the literature. By contrast, there is no noticeable flattening in both integrated Hα(H ii)–M(H ii) and spatially resolved ΣHα(H ii)–Σ(H ii) relations when only regions where star formation dominates the ionization are considered. In other words, the flattening can be attributed to the increasing regions powered by non-star-formation sources, which generally have lower ionizing ability than star formation. An analysis of the fractional contribution of non-star-formation sources to total Hα luminosity of a galaxy suggests a decreasing role of star formation as an ionizing source toward high-mass, high-B/T galaxies and bulge regions. This result indicates that the appearance of the galaxy integrated SFR–M relation critically depends on their global properties (M*(global) and B/T) and relative abundances of various ionizing sources within the galaxies.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-854-2-AAA9BC
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/32081]
专题	中国科学院上海天文台
作者单位	1.McDonald Observatory, The University of Texas at Austin, 1 University Station, Austin, TX 78712, USA 2.Academia Sinica, Institute of Astronomy and Astrophysics (ASIAA), P.O. Box 23-141, Taipei 10617, Taiwan; hapan@asiaa.sinica.edu.tw 3.Instituto de Astronomía, Universidad Nacional Autonóma de Mexico, A.P. 70-264, 04510, México, D.F., México 4.Unidad de Astronoma, Universidad de Antofagasta, Avenida Angamos 601, Antofagasta 1270300, Chile 5.Instituto Milenio de Astrofísica, Av. Vicu?a Mackenna 4860, Macul, Santiago, Chile 6.Instituto de Astrofísica, Pontificia Universidad Católica de Chile, Av. V. Mackenna 4860, 782-0436 Macul, Santiago, Chile 7.Apache Point Observatory and New Mexico State University, P.O. Box 59, Sunspot, NM, 88349-0059, USA 8.Sternberg Astronomical Institute, Moscow State University, Moscow 9.Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People's Republic of China 10.Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Burnaby Road, Portsmouth PO1 3FX, UK
推荐引用方式 GB/T 7714	Pan,Hsi-An,Lin,Lihwai,Hsieh,Bau-Ching,et al. SDSS IV MaNGA: Dependence of Global and Spatially Resolved SFR–M? Relations on Galaxy Properties[J]. The Astrophysical Journal,2018,854(2).
APA	Pan,Hsi-An.,Lin,Lihwai.,Hsieh,Bau-Ching.,Sánchez,Sebastián F..,Ibarra-Medel,Héctor.,...&Xiao,Ting.(2018).SDSS IV MaNGA: Dependence of Global and Spatially Resolved SFR–M? Relations on Galaxy Properties.The Astrophysical Journal,854(2).
MLA	Pan,Hsi-An,et al."SDSS IV MaNGA: Dependence of Global and Spatially Resolved SFR–M? Relations on Galaxy Properties".The Astrophysical Journal 854.2(2018).