2005A&A...444..109H


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.28CET12:32:08

2005A&A...444..109H - Astronomy and Astrophysics, volume 444, 109-117 (2005/12-2)

The opacity of spiral galaxy disks. VI. Extinction, stellar light and color.

HOLWERDA B.W., GONZALEZ R.A., VAN DER KRUIT P.C. and ALLEN R.J.

Abstract (from CDS):

In this paper we explore the relation between dust extinction and stellar light distribution in disks of spiral galaxies. Extinction influences our dynamical and photometric perception of disks, since it can distort our measurement of the contribution of the stellar component. To characterize the total extinction by a foreground disk, Gonzalez et al. (1998ApJ...506..152G) proposed the ``Synthetic Field Method'' (SFM), which uses the calibrated number of distant galaxies seen through the foreground disk as a direct indication of extinction. The method is described in Gonzalez et al. (1998ApJ...506..152G) and Holwerda et al. (2005AJ....129.1381H). To obtain good statistics, the method was applied to a set of HST/WFPC2 fields (Holwerda et al., 2005AJ....129.1396H) and radial extinction profiles were derived, based on these counts. In the present paper, we explore the relation of opacity with surface brightness or color from 2MASS images, as well as the relation between the scalelengths for extinction and light in the I band. We find that there is indeed a relation between the opacity (AI) and the surface brightness, particularly at the higher surface brightnesses. No strong relation between near infrared (H-J, H-K) color and opacity is found. The scalelengths of the extinction are uncertain for individual galaxies but seem to indicate that the dust distribution is much more extended than the stellar light. The results from the distant galaxy counts are also compared to the reddening derived from the Cepheids light-curves (Freedman et al., 2001ApJ...553...47F). The extinction values are consistent, provided the selection effect against Cepheids with higher values of AI is taken into account. The implications from these relations for disk photometry, M/L conversion and galaxy dynamical modeling are briefly discussed.

Abstract Copyright:

Journal keyword(s): radiative transfer - methods: statistical - ISM: dust, extinction - galaxies: ISM - galaxies: spiral - galaxies: photometry

Simbad objects: 24

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Number of rows : 24

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 925 H2G 02 27 16.913 +33 34 43.97   10.69 10.12 9.55   ~ 685 1
2 UGC 2302 G 02 49 08.76 +02 07 37.3   15.3       ~ 52 0
3 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5505 1
4 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1496 2
5 NGC 1425 EmG 03 42 11.4841820747 -29 53 36.192654761   11.61   11.6 10.9 ~ 183 0
6 NGC 2541 GiG 08 14 40.1104536348 +49 03 42.058472450 12.03 12.26 11.80     ~ 275 1
7 NGC 2841 LIN 09 22 02.655 +50 58 35.32 10.43 10.09 9.22     ~ 971 1
8 NGC 3198 EmG 10 19 54.990 +45 32 58.88 10.83 10.87 10.33     ~ 803 1
9 NGC 3319 SyG 10 39 09.533 +41 41 12.74   11.48 11.07     ~ 272 1
10 M 95 GiP 10 43 57.733 +11 42 13.00 10.71 10.51 9.73 9.48   ~ 919 2
11 NGC 3621 AGN 11 18 16.300 -32 48 45.36 10.10 9.44 9.56 8.07 10.1 ~ 479 3
12 M 66 GiP 11 20 15.026 +12 59 28.64 9.85 9.65 8.92     ~ 1138 4
13 UGC 6614 LIN 11 39 14.8715231180 +17 08 37.195414914   14.8       ~ 119 0
14 M 100 AGN 12 22 54.9318850854 +15 49 20.294302163 10.04 10.05 9.35     ~ 1625 2
15 NGC 4414 GiG 12 26 27.089 +31 13 24.76 11.12 10.96 10.12     ~ 509 2
16 NGC 4505 GiP 12 31 39.2222350443 +03 56 21.641915355   11.71       ~ 306 0
17 NGC 4535 H2G 12 34 20.310 +08 11 51.94   11.1       ~ 511 0
18 NGC 4536 GiP 12 34 27.129 +02 11 16.37 11.14 11.16 10.55 17.393   ~ 739 3
19 M 91 LIN 12 35 26.430 +14 29 46.75   14.63 13.57     ~ 520 0
20 NGC 4571 GiP 12 36 56.3722472082 +14 13 02.297281940   13.6       ~ 296 1
21 NGC 4603 GiG 12 40 55.2225297187 -40 58 35.067945266   12.42 11.30 10.96 11.5 ~ 104 0
22 NGC 4639 GiP 12 42 52.3781396179 +13 15 26.712929286   13.62 12.72     ~ 551 0
23 NGC 4725 Sy2 12 50 26.5692916552 +25 30 02.737610391   13.45 12.44     ~ 613 2
24 NGC 7331 LIN 22 37 04.102 +34 24 57.31 10.65 10.35 9.48     ~ 1095 2

    Equat.    Gal    SGal    Ecl

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