ON THE USE OF FAR-INFRARED LUMINOSITY AS A STAR FORMATION INDICATOR IN GALAXIES

被引:96
作者
SAUVAGE, M
THUAN, TX
机构
[1] UNIV VIRGINIA, DEPT ASTRON, CHARLOTTESVILLE, VA 22903 USA
[2] CENS, SERV ASTROPHYS, F-91191 GIF SUR YVETTE, FRANCE
关键词
GALAXIES; INTERSTELLAR MATTER; INFRARED; STARS; FORMATION;
D O I
10.1086/186519
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
By comparing the H-alpha and far-infrared (FIR) luminosities for an optically selected and magnitude-limited (m(B) less-than-or-equal-to 14.5) sample of galaxies, we have found a strong nonlinearity in the log L(H-alpha)-log L(FIR) correlation, and a systematic decrease of the L(FIR)/L(H-alpha) ratio from early- to late-type spirals. We show that these trends cannot be interpreted in the frame of a single-component model for the FIR emission of galaxies, with the star formation rate as the only parameter, but are consistent with a two-component model, with the cirrus fraction as the second parameter. We found a decreasing contribution of the cirrus component to L(FIR) toward later types, going from approximately 86% for Sa galaxies to approximately 3% for Sdm galaxies. If L(FIR) is to be used as a star formation indicator in galaxies, it needs to be corrected, to first order, for the cirrus component, taking into account the morphological type of the galaxy.
引用
收藏
页码:L69 / L73
页数:5
相关论文
共 25 条
[11]   THE RATE OF STAR FORMATION IN NORMAL DISK GALAXIES [J].
KENNICUTT, RC .
ASTROPHYSICAL JOURNAL, 1983, 272 (01) :54-67
[12]   ON THE REDISTRIBUTION OF OB STAR LUMINOSITY AND THE WARMING OF NEARBY MOLECULAR CLOUDS [J].
LEISAWITZ, D ;
HAUSER, MG .
ASTROPHYSICAL JOURNAL, 1988, 332 (02) :954-&
[13]   ON THE ORIGIN OF THE 40-120 MICRON EMISSION OF GALAXY DISKS - A COMPARISON WITH H-ALPHA FLUXES [J].
PERSSON, CJL ;
HELOU, G .
ASTROPHYSICAL JOURNAL, 1987, 314 (02) :513-524
[14]   THE INFRARED STRUCTURE OF M33 [J].
RICE, W ;
BOULANGER, F ;
VIALLEFOND, F ;
SOIFER, BT ;
FREEDMAN, WL .
ASTROPHYSICAL JOURNAL, 1990, 358 (02) :418-&
[15]   STAR FORMATION IN SPIRAL GALAXIES .1. H-ALPHA OBSERVATIONS [J].
ROMANISHIN, W .
ASTRONOMICAL JOURNAL, 1990, 100 (02) :373-376
[16]   MODELS FOR INFRARED-EMISSION FROM IRAS GALAXIES [J].
ROWANROBINSON, M ;
CRAWFORD, J .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1989, 238 (02) :523-558
[17]  
SAUVAGE M, 1990, ASTRON ASTROPHYS, V237, P296
[18]  
SAUVAGE M, 1991, THESIS U PARIS 7
[19]  
SAUVAGE M, 1992, UNPUB
[20]  
Scalo J. M., 1986, Fundamentals of Cosmic Physics, V11, P1