CONSTRAINTS ON THE OPACITY OF SPIRAL DISKS FROM NEAR-INFRARED OBSERVATIONS

Details CONSTRAINTS ON THE OPACITY OF SPIRAL DISKS FROM NEAR-INFRARED OBSERVATIONS CONSTRAINTS ON THE OPACITY OF SPIRAL DISKS FROM NEAR-INFRARED OBSERVATIONS

1995-01-19

arxiv.org/abs/astro-ph/9501067v1

Astronomy and Astrophysics

Astrophysics

Invited Talk at the NATO Workshop on the "Opacity of Spiral Disks", Cardiff, July 1994. 10 pages with 5 Figures, uuencoded.

Scientific paper

In this paper I review how near-infrared (NIR) observations can constrain the opacity of spiral disks. Basic considerations show that NIR photometry provides a powerful probe of the optical depths in spiral galaxy disks in the regime of interest, where the optical depth in the V-band is near unity. I review the existing opacity constraints from the analysis of dust lanes in edge-on and face-on galaxies. The ``internal extinction correction" in the NIR-Tully-Fisher relation deserves particular attention as the most powerful constraint on the impact of dust on the total luminosity of spiral galaxies. All observations for luminous spirals point towards an effective, face-on optical depth of tau_V=0.5-1.

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