2006A&A...455..539R


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.24CET12:31:29

2006A&A...455..539R - Astronomy and Astrophysics, volume 455, 539-547 (2006/8-4)

Hα line profiles for a sample of supergiant HII regions. I. The main spectral component.

ROZAS M., RICHER M.G., LOPEZ J.A., RELANO M. and BECKMAN J.E.

Abstract (from CDS):

We present an analysis of the Hα emission line profiles of a sample of giant extragalactic HII regions, selected from among the brightest and most isolated in a group of spiral galaxies for which we have photometric and spectroscopic data: NGC 157, NGC 3631, NGC 6764, NGC 3344, NGC 4321, NGC 5364, NGC 5055, NGC 5985, NGC 7479. Our study confirms that the majority of the line profiles are composed of a bright, main component and two fainter, high velocity components that we denominate wings. Here, we analyze the kinematics of the principal components, finding a relation between the Hα luminosity, L, and the turbulent velocity dispersion, σnt. A linear fit to the relation between these quantities yields log L=(35.6±0.4)+(2.87±0.2)logσnt, in agreement with previous studies. We compute the mass of each HII region using both the virial theorem and the Hα luminosity, confirming that, though these estimates do not coincide exactly, they are comparable within the uncertainties and consequently that the HII regions in our sample are approximately virialized.

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Journal keyword(s): ISM: HII regions - ISM: kinematics and dynamics

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 - 2020
#notes
1 NGC 157 EmG 00 34 46.751 -08 23 47.36   11.0 19.00 10.03 10.7 ~ 323 0
2 NGC 346 Cl* 00 59 05.090 -72 10 33.24           ~ 443 0
3 NGC 925 H2G 02 27 16.913 +33 34 43.97   10.69 10.12 9.55   ~ 685 1
4 NGC 1530 G 04 23 27.102 +75 17 44.05   13.40       ~ 251 1
5 NGC 3344 EmG 10 43 31.150 +24 55 19.99 10.38 10.54 9.86 9.71   ~ 341 1
6 NGC 3359 EmG 10 46 36.845 +63 13 25.10 10.83 11.03 10.57     ~ 339 1
7 NGC 3631 IG 11 21 02.944 +53 10 09.95   11.0       ~ 322 1
8 M 100 AGN 12 22 54.9318850854 +15 49 20.294302163 10.04 10.05 9.35     ~ 1625 2
9 M 63 LIN 13 15 49.2738527699 +42 01 45.726078017   9.34 8.59 8.35   ~ 1036 2
10 NGC 5364 GiP 13 56 12.004 +05 00 52.06   13.2       ~ 230 0
11 NGC 5985 SyG 15 39 37.0620220294 +59 19 55.246166585   15.24 14.22     ~ 214 0
12 NGC 6764 LIN 19 08 16.348 +50 55 59.14   15.00 14.32     ~ 272 1
13 NGC 6951 Sy2 20 37 14.1181441937 +66 06 20.078027288   11.64 10.65     ~ 493 2
14 NGC 7479 Sy2 23 04 56.668 +12 19 22.36 11.74 11.60 10.85 10.47 9.66 ~ 655 2

    Equat.    Gal    SGal    Ecl

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2020.02.24-12:31:29

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