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Variation of the Mid-infrared versus Hα Luminosity Correlation with Increasing Redshift for Galaxies in the Local Universe
Zhu,Yinan1,2; Wu,Hong1; Jin,Junjie1,3
2019-03-26
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume874Issue:1
AbstractAbstract The correlation between mid-infrared (MIR) and Hα luminosity (hereafter referred to as the MIR versus Hα correlation) has been investigated for years, and these approximate linear correlations have been applied to many studies to derive the ongoing star formation rate (SFR) for galaxies near and far. We present and analyze the correlations between rest-frame 12 and 22 μm and Hα luminosities for a large sample of star-forming galaxies with redshift ranging from 0.03 to 0.15 selected in the cross-matched SDSS DR7 and ALLWISE survey. For the galaxies located in a relatively narrow redshift bin (Δz?~?0.01), we find that the fitting slope of the MIR versus Hα correlation is always less than 1, and less than the slope derived for all the star-forming galaxies covering a broad redshift range (0.03 < z < 0.15). Additionally, the fitting intercept increases with redshift. We check the influence on the L[MIR] versus L[Hα] correlation from K- and aperture correction, the variation of either star formation history or morphology, and find their influence is not large enough to account for the inconsistency of the MIR versus Hα correlation individually. We also find that there is possible evolution for the SFR versus M* (stellar mass) correlation within the redshift coverage from 0.03 to 0.15. Finally, we warn that an unwanted error might be brought in if the MIR versus Hα correlation derived from the sample covering a large redshift interval has been applied, and indicate an explicit study is needed to establish an accurate, redshift-independent MIR versus Hα correlation.
Keywordgalaxies: starburst infrared: galaxies stars: formation
DOI10.3847/1538-4357/ab04a1
Language英语
WOS IDIOP:0004-637X-874-1-ab04a1
PublisherThe American Astronomical Society
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/31047
Collection中国科学院国家天文台
Affiliation1.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China zhuyn9@mail.sysu.edu.cn
2.School of Physics and Astronomy, Sun Yat-sen University, Zhuhai 519082, People's Republic of China; hwu@bao.ac.cn
3.School of Astronomy and Space Science University of Chinese Academy of Sciences, Beijing 100039, People's Republic of China; jjjin@bao.ac.cn
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhu,Yinan,Wu,Hong,Jin,Junjie. Variation of the Mid-infrared versus Hα Luminosity Correlation with Increasing Redshift for Galaxies in the Local Universe[J]. The Astrophysical Journal,2019,874(1).
APA Zhu,Yinan,Wu,Hong,&Jin,Junjie.(2019).Variation of the Mid-infrared versus Hα Luminosity Correlation with Increasing Redshift for Galaxies in the Local Universe.The Astrophysical Journal,874(1).
MLA Zhu,Yinan,et al."Variation of the Mid-infrared versus Hα Luminosity Correlation with Increasing Redshift for Galaxies in the Local Universe".The Astrophysical Journal 874.1(2019).
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