Internal extinction and gas column density in spiral galaxies.

Details Internal extinction and gas column density in spiral galaxies. Internal extinction and gas column density in spiral galaxies.

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...324...32x&link_type=abstract

Astronomy and Astrophysics, v.324, p.32-40

Astronomy and Astrophysics

Astrophysics

16

Galaxies: Ism, Infrared: Galaxies, Ultraviolet: Galaxies, Ism: Dust, Extinction

Scientific paper

The method for the extinction correction based on the gas column density is tested. A positive correlation is found between the total gas column density and the extinction estimated using a model based on energy conservation (`frequency-converter model'). Assuming a Solar Neighbourhood optical-depth-to-gas ratio, extinction is predicted from the gas column density using a radiative transfer model which adopts a `Sandwich' configuration for the stellar and dust distributions, and which takes also into account the effect of scattering. This prediction agrees well with the extinction estimated from the energy conservation consideration. This indicates that (1) the method for the extinction correction based on the gas column density is a robust one; (2) in the inner part of galaxy disks where most of the extinction occurs, the dust-to-gas ratio is on average about the same as the Solar Neighbourhood value. Our results also suggest that dust grains associated with both gas phases (HI and H_2_) participate in the extinction, with a relative importance depending on the abundance of the gas phase in the inner disk. For most of the galaxies in our sample the extinction is mainly due to the dust associated with the molecular gas because they have high molecular to atomic gas column density ratios. On the other hand, for galaxies whose gas column density is dominated by the atomic gas, the extinction seems to be mainly caused by the dust associated with atomic gas.

Affiliated with

Also associated with

No associations

Rating

Internal extinction and gas column density in spiral galaxies. does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Internal extinction and gas column density in spiral galaxies., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Internal extinction and gas column density in spiral galaxies. will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1877597