PMO OpenIR  > 星系中的恒星形成研究团组
The global star formation law of galaxies revisited in the radio continuum
Liu LiJie1,2; Gao Yu1
2012-02-01
Source PublicationSCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
ISSN1674-7348
Volume55Issue:2Pages:347-353
AbstractWe study the global star formation law, the relation between the gas and star formation rate (SFR) in a sample of 130 local galaxies with infrared (IR) luminosities spanning over three orders of magnitude (10(9)-10(12) L-aS (TM)), which includes 91 normal spiral galaxies and 39 (ultra)luminous IR galaxies [(U)LIRGs]. We derive their total (atomic and molecular) gas and dense molecular gas masses using newly available HI, CO and HCN data from the literature. The SFR of galaxies is determined from total IR (8-1000 mu m) and 1.4 GHz radio continuum (RC) luminosities. The galaxy disk sizes are defined by the de-convolved elliptical Gaussian FWHM of the RC maps. We derive the galaxy disk-averaged SFRs and various gas surface densities, and investigate their relationships. We find that the galaxy disk-averaged surface density of dense molecular gas mass has the tightest correlation with that of SFR (scatter similar to 0.26 dex), and is linear in log-log space (power-law slope of N=1.03 +/- 0.02) across the full galaxy sample. The correlation between the total gas and SFR surface densities for the full sample has a somewhat larger scatter (similar to 0.48 dex), and is best fit by a power-law with slope 1.45 +/- 0.02. However, the slope changes from similar to 1 when only normal spirals are considered, to similar to 1.5 when more and more (U)LIRGs are included in the fitting. When different CO-to-H-2 conversion factors are used to infer molecular gas masses for normal galaxies and (U)LIRGs, the bi-modal relations claimed recently in CO observations of high-redshift galaxies appear to also exist in local populations of star-forming galaxies.
KeywordGalaxies: Evolation Galaxies: Ism Radio Lines: Galaxies Stars: Fromation
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1007/s11433-011-4617-1
WOS KeywordDENSE MOLECULAR GAS ; ULTRALUMINOUS INFRARED GALAXIES ; HIGH-REDSHIFT ; FORMING GALAXIES ; NEARBY GALAXIES ; SPIRAL GALAXIES ; HCN ; STARBURSTS ; SAMPLE ; CO
Indexed BySCI
Language英语
WOS Research AreaPhysics
WOS SubjectPhysics, Multidisciplinary
WOS IDWOS:000299295500023
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8076
Collection星系中的恒星形成研究团组
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China
Recommended Citation
GB/T 7714
Liu LiJie,Gao Yu. The global star formation law of galaxies revisited in the radio continuum[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2012,55(2):347-353.
APA Liu LiJie,&Gao Yu.(2012).The global star formation law of galaxies revisited in the radio continuum.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,55(2),347-353.
MLA Liu LiJie,et al."The global star formation law of galaxies revisited in the radio continuum".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 55.2(2012):347-353.
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