NAOC Open IR  > 射电天文研究部
STELLAR POPULATIONS OF ULTRALUMINOUS INFRARED GALAXIES
Hou, L. G.1; Han, J. L.1; Kong, M. Z.2; Wu, Xue-Bing3
2011-05-10
Source PublicationASTROPHYSICAL JOURNAL
Volume732Issue:2
AbstractUltraluminous infrared galaxies (ULIRGs) are classified into several types depending on the dominance of starburst or active galactic nucleus (AGN) components. We conducted a stellar population analysis for a sample of 160 ULIRGs to study the evolution of ULIRGs. We found that the dominance of intermediate-age and old stellar populations increases along the sequence of H II-like ULIRGs, Seyfert-H II composite ULIRGs, and Seyfert 2 ULIRGs. Consequently, the typical mean stellar age and stellar mass increase along the sequence. Comparing the gas mass estimated from the CO measurements to the stellar mass estimated from the optical spectra, we found that the gas fraction is anti-correlated with stellar mass. Even so, the total masses of H II-like ULIRGs with small stellar masses and a large fraction of gas are not comparable to the small masses of Seyfert 2 ULIRGs. This indicates that H II-like ULIRGs with small stellar masses have no evolutionary connections with massive Seyfert 2 ULIRGs. Only massive ULIRGs may follow the evolution sequence toward AGNs, and massive H II-like ULIRGs are probably in an earlier stage of the sequence.
KeywordGalaxies: Active Galaxies: Evolution Galaxies: Starburst Galaxies: Stellar Content
DOI10.1088/0004-637X/732/2/72
Indexed BySCI
Language英语
WOS IDWOS:000289935900012
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7999
Collection射电天文研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Hebei Normal Univ, Dept Phys, Shijiazhuang 050016, Peoples R China
3.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Hou, L. G.,Han, J. L.,Kong, M. Z.,et al. STELLAR POPULATIONS OF ULTRALUMINOUS INFRARED GALAXIES[J]. ASTROPHYSICAL JOURNAL,2011,732(2).
APA Hou, L. G.,Han, J. L.,Kong, M. Z.,&Wu, Xue-Bing.(2011).STELLAR POPULATIONS OF ULTRALUMINOUS INFRARED GALAXIES.ASTROPHYSICAL JOURNAL,732(2).
MLA Hou, L. G.,et al."STELLAR POPULATIONS OF ULTRALUMINOUS INFRARED GALAXIES".ASTROPHYSICAL JOURNAL 732.2(2011).
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