1997A&A...324...32X


Query : 1997A&A...324...32X

1997A&A...324...32X - Astronomy and Astrophysics, volume 324, 32-40 (1997/8-1)

Internal extinction and gas column density in spiral galaxies.

XU C., BUAT V., BOSELLI A. and GAVAZZI G.

Abstract (from CDS):

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 H2) 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.

Abstract Copyright:

Journal keyword(s): galaxies: ISM - infrared: galaxies - ultraviolet: galaxies - ISM: dust, extinction

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 3353 AGN 10 45 22.390 +55 57 37.36 12.90 13.25 12.79     ~ 339 1
2 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 1036 1
3 2MASX J11454468+2001518 GiG 11 45 44.689 +20 01 51.83   15.5   15.00   ~ 43 0
4 NGC 3883 GiG 11 46 47.1784902912 +20 40 31.508211756   14.2       ~ 83 0
5 NGC 4178 H2G 12 12 46.443 +10 51 57.59   12.9       ~ 336 0
6 NGC 4299 GiP 12 21 40.548 +11 29 59.74   12.8       ~ 233 0
7 NGC 4383 AGN 12 25 25.518 +16 28 12.02 12.41 12.67 12.12     ~ 235 1
8 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6249 0
9 NGC 4519 GiG 12 33 30.278 +08 39 16.06   12.8       ~ 267 0
10 NGC 4701 GiG 12 49 11.5931072112 +03 23 19.389227964   13.1       ~ 159 0
11 NGC 4713 GiG 12 49 57.8802780576 +05 18 40.933127196   12.3       ~ 287 0
12 NGC 4808 GiG 12 55 48.940 +04 18 14.74   12.5       ~ 212 0
13 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4501 2
14 NGC 5474 GiP 14 05 01.608 +53 39 43.95   11.28 10.79     ~ 410 1

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2022.05.20-18:53:08

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