The Hα and infrared star formation rates for the Nearby Field Galaxy Survey

被引:181
作者
Kewley, LJ
Geller, MJ
Jansen, RA
Dopita, MA
机构
[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[2] Smithsonian Astrophys Observ, Cambridge, MA 02138 USA
[3] Arizona State Univ, Dept Phys & Astron, Tempe, AZ 85287 USA
[4] Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
关键词
dust; extinction; galaxies : spiral; galaxies : starburst;
D O I
10.1086/344487
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We investigate the Halpha and infrared star formation rate (SFR) diagnostics for galaxies in the Nearby Field Galaxy Survey (NFGS). For the 81 galaxies in our sample, we derive Halpha fluxes (included here) from integrated spectra. There is a strong correlation between the ratio of far-infrared to optical luminosities L(FIR)/L(Halpha) and the extinction E(B-V) measured with the Balmer decrement. Before reddening correction, the SFR(IR) and SFR(Halpha) are related to each other by a power law: SFR(IR) = (2.7 +/- 0.3) SFR(Halpha) 1.30 +/- 0.06. Correction of the SFR(Halpha) for extinction using the Balmer decrement and a classical reddening curve both reduces the scatter in the SFR(IR)-SFR(Halpha) correlation and results in a much closer agreement between the two SFR indicators; SFR(IR) = (0.91 +/- 0.04) SFR(Halpha(corr))(1.07+/-0.03). SFR(IR) and SFR(Halpha) agree to similar to10%. This SFR relationship spans 4 orders of magnitude and holds for all Hubble types with IRAS detections in the NFGS. A constant ratio between the SFR(IR) and SFR(Halpha) for all Hubble types, including early types (S0-Sab), suggests that the IR emission in all these objects results from a young stellar population.
引用
收藏
页码:3135 / 3143
页数:9
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