2008ApJ...672..423K

Query : 2008ApJ...672..423K

2008ApJ...672..423K - Astrophys. J., 672, 423-432 (2008/January-1)

The early evolution of massive stars: radio recombination line spectra.

KETO E., ZHANG Q. and KURTZ S.

Abstract (from CDS):

Velocity shifts and differential broadening of radio recombination lines are used to estimate the densities and velocities of the ionized gas in several hypercompact and ultracompact H II regions. These small H II regions are thought to be at their earliest evolutionary phase and associated with the youngest massive stars. The observations suggest that these H II regions are characterized by high densities, supersonic flows, and steep density gradients, consistent with accretion and outflows that would be associated with the formation of massive stars.

Abstract Copyright: ∼

Journal keyword(s): ISM: H II Regions - Stars: Early-Type - Stars: Formation

CDS comments: In tables, next PKS are not identified : 1851+005, 1911-201, 2025+337, 2202+422, and 2250+558

Simbad objects: 21

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Number of rows : 21
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2924 2
2 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2421 1
3 JCMTSE J053514.4-052232 Y*? 05 35 14.488 -05 22 32.10           ~ 48 0
4 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 6022 1
5 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
6 NGC 6334 HII 17 20 53 -36 07.9           ~ 740 0
7 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2443 1
8 GAL 009.62+00.19 HII 18 06 13.9 -20 31 44           ~ 226 0
9 [GRM93] G09.61+0.20 F Rad 18 06 14.89 -20 31 38.9           ~ 29 1
10 W 31c HII 18 10 29.1 -19 56 05           ~ 357 0
11 AGAL G028.199-00.049 cor 18 42 58 -04 14.0           ~ 46 0
12 GAL 028.20-00.04 HII 18 42 58.08 -04 14 04.6           ~ 61 0
13 W 49 SFR 19 10 20 +09 07.7           ~ 601 1
14 GRS G045.07 +00.13 Rad 19 13 22 +10 50.9           ~ 21 0
15 IRAS 19110+1045 Y*O 19 13 22.0427 +10 50 53.336           ~ 132 0
16 JCMTSF J191322.9+105107 Rad 19 13 22.3 +10 51 07           ~ 4 0
17 W 51e2 Ma* 19 23 43.906 +14 30 34.48           ~ 222 0
18 W 51 SNR 19 23 50 +14 06.0           ~ 1352 1
19 ICRF J192559.6+210626 BLL 19 25 59.60535459 +21 06 26.1620257           ~ 212 1
20 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 3004 2
21 [WBN74] NGC 7538 IRS 1 Y*O 23 13 45.318 +61 28 11.69           ~ 433 3

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