2005A&A...432..423T -
Astronomy and Astrophysics, volume 432, 423-429 (2005/3-3)
Mid-infrared luminosity as an indicator of the total infrared luminosity of galaxies.
TAKEUCHI T.T., BUAT V., IGLESIAS-PARAMO J., BOSELLI A. and BURGARELLA D.
Abstract (from CDS):
The infrared (IR) emission plays a crucial role in understanding the star formation in galaxies hidden by dust. We first examined four estimators of the IR luminosity of galaxies, L
FIR (Helou et al.,
1988ApJS...68..151H), L
TIR (Dale et al.,
2001ApJ...549..215D), revised version of L
TIR (Dale et al.,
2002ApJ...576..159D) (we denote L
TIR2), and L
IR (Sanders & Mirabel,
1996ARA&A..34..749S) by using the observed SEDs of well-known galaxies. We found that L
IR provides excellent estimates of the total IR luminosity for a variety of galaxy SEDs. The performance of L
TIR2 was also found to be very good. Using L
IR, we then statistically analyzed the IRAS PSCz galaxy sample (Saunders et al.,
2000MNRAS.317...55S) and found useful formulae relating the MIR monochromatic luminosities [L(12µm) and L(25µm)] and L
IR. For this purpose we constructed a subsample of 1420 galaxies with all four IRAS band (12, 25, 60, and 100µm) flux densities. We found linear relations between L
IR and MIR luminosities, L(12µm) and L(25µm). The prediction error with a 95% confidence level is a factor of 4-5. Hence, these formulae are useful for the estimation of the total IR luminosity only from 12µm or 25µm observations. We further tried to make an ``interpolation'' formula for galaxies at 0<z<1. For this purpose we construct the formula of the relation between 15-µm luminosity and the total IR luminosity. We conclude that the 15-µm formula can be used as an estimator of the total IR luminosity from 24µm observation of galaxies at z≃0.6.
Abstract Copyright:
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Journal keyword(s):
dust, extinction - galaxies: statistics - infrared: galaxies - methods: statistical
Simbad objects:
18
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