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

Query : 2006A&A...455..539R

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_Hα, and the turbulent velocity dispersion, σ_nt. A linear fit to the relation between these quantities yields log L_Hα=(35.6±0.4)+(2.87±0.2)logσ_nt, 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.

Abstract Copyright: ∼

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 - 2023	#notes
1	NGC 157	EmG	00 34 46.7879913696	-08 23 47.273597952		11.0	19.00	10.03	10.7	~	346	0
2	NGC 346	Cl*	00 59 04.4000	-72 10 39.000						~	479	0
3	NGC 925	H2G	02 27 16.913	+33 34 43.97		10.69	10.12	9.55		~	765	1
4	NGC 1530	G	04 23 27.102	+75 17 44.05		13.40				~	272	1
5	NGC 3344	EmG	10 43 31.150	+24 55 19.99	10.38	10.54	9.86	9.71		~	389	1
6	NGC 3359	EmG	10 46 36.845	+63 13 25.10	10.83	11.03	10.57			~	361	1
7	NGC 3631	IG	11 21 02.8871865144	+53 10 10.415331660		11.0				~	346	1
8	M 100	AGN	12 22 54.9299993592	+15 49 20.296257960	10.04	10.05	9.35			~	1800	2
9	M 63	LIN	13 15 49.2741893928	+42 01 45.728076108		9.34	8.59	8.35		~	1197	2
10	NGC 5364	GiP	13 56 12.004	+05 00 52.06		13.2				~	252	0
11	NGC 5985	SyG	15 39 37.0545742176	+59 19 55.216886664		15.24	14.22			~	244	0
12	NGC 6764	LIN	19 08 16.4036066688	+50 55 59.519979084		15.00	14.32			~	293	1
13	NGC 6951	Sy2	20 37 14.1228088488	+66 06 20.049916392		11.64	10.65			~	521	2
14	NGC 7479	Sy2	23 04 56.6432243448	+12 19 22.357387020	11.74	11.60	10.85	10.47	9.66	~	729	2

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