Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-05-06
Astronomy and Astrophysics
Astrophysics
45 pages, to appear in Ap.J. vol. 468 (Sept. 1996). 17 postscript figures and 10 postscript tables available at ftp://ipac.c
Scientific paper
10.1086/177677
We present new high spatial resolution Kuiper Airborne Observatory 50 micron and/or 100 micron data for 11 infrared-bright galaxies. We also tabulate previously published KAO data for 11 other galaxies, along with the IRAS data for the bulges of M 31 and M 81. We find that L(FIR)/L(B) and L(FIR)/L(H) correlate with CO (1 - 0) intensity and tau(100). Galaxies with optical or near-infrared signatures of OB stars in their central regions have higher values of I(CO) and tau(100), as well as higher far-infrared surface brightnesses and L(FIR)/L(B) and L(FIR)/L(H) ratios. L(FIR)/L(H(alpha)) does not correlate strongly with CO and tau(100). These results support a scenario in which OB stars dominate dust heating in the more active galaxies and older stars are important in quiescent bulges.
Harvey Paul Michael
Smith Beverly J.
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