2011ApJS..194...44S


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.19CEST01:01:14

2011ApJS..194...44S - Astrophys. J., Suppl. Ser., 194, 44 (2011/June-0)

A very large array study of ultracompact and hypercompact H II regions from 0.7 to 3.6 cm.

SEWILO M., CHURCHWELL E., KURTZ S., GOSS W.M. and HOFNER P.

Abstract (from CDS):

We report multi-frequency Very Large Array observations of three massive star formation regions (MSFRs) containing radio continuum components that were identified as broad radio recombination line (RRL) sources and hypercompact (HC) H II region candidates in our previous H92α and H76α study: G10.96+0.01 (component W), G28.20-0.04 (N), and G34.26+0.15 (B). An additional HC H II region candidate, G45.07+0.13, known to have broad H66α and H76α lines, small size, high electron density, and emission measure, was also included. We observed with high spatial resolution (0".9-2".3) the H53α, H66α, H76α, and H92α RRLs and the radio continuum at the corresponding wavelengths (0.7-3.6 cm). The motivation for these observations was to obtain RRLs over a range of principal quantum states to look for signatures of pressure broadening and macroscopic velocity structure. We find that pressure broadening contributes significantly to the linewidths, but it is not the sole cause of the broad lines. We compare radio continuum and dust emission distributions and find a good correspondence. We also discuss maser emission and multi-wavelength observations reported in the literature for these MSFRs.

Abstract Copyright:

Journal keyword(s): H II regions - radio lines: ISM - stars: formation

Nomenclature: Table 3: [SCK2011] GLL.ll+B.bb A, [SCK2011] GLL.ll+B.bb W, [SCK2011] GLL.ll+B.bb WN, [SCK2011] GLL.ll+B.bb WW, N=12.

Simbad objects: 28

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Number of rows : 28

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 963 2
2 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825107   17.51 17.25     ~ 3878 2
3 GAL 009.62+00.19 HII 18 06 13.9 -20 31 44           ~ 189 0
4 SSTGLMA G010.9584+00.0219 HII 18 09 39.36 -19 26 27.1           ~ 6 1
5 [SCK2011] G10.96+0.01 E Rad 18 09 42.85 -19 26 29.6           ~ 1 0
6 SSTGLMA G010.9646+00.0098 Rad 18 09 42.9 -19 26 30           ~ 1 0
7 [SCK2011] G10.96+0.01 E1 Rad 18 09 42.98 -19 26 28.2           ~ 1 0
8 [SCK2004] G010.96+0.01 E Rad 18 09 43.08 -19 26 27.0           ~ 4 0
9 GAL 010.96+00.01 HII 18 09 43.2 -19 26 27           ~ 7 0
10 QSO J1820-2528 QSO 18 20 57.84869182 -25 28 12.5836842   18.56       ~ 83 0
11 GAL 024.78+00.08 HII 18 36.2 -07 13           ~ 75 0
12 [SCK2011] G28.20-0.04 S Rad 18 42 58.12 -04 14 04.9           ~ 1 0
13 GAL 028.20-00.04 HII 18 42 58.2 -04 14 05           ~ 52 0
14 [SCK2004] G028.20-0.04 S Rad 18 42 58.20 -04 14 04.3           ~ 2 0
15 [SCK2011] G28.20-0.04 S1 Rad 18 42 58.29 -04 14 04.4           ~ 1 0
16 AGAL G028.199-00.049 cor 18 42 58.7995 -04 14 00.349           ~ 36 0
17 QSO J1851+005 QSO 18 51 46.7217 +00 35 32.414           ~ 32 0
18 OH 34.26 +0.15 SFR 18 53 18.54 +01 14 57.9           ~ 474 0
19 SSTGLMA G034.2572+00.1533 MIR 18 53 18.6 +01 14 58           ~ 2 0
20 [SCK2011] G34.26+0.15 B Rad 18 53 18.66 +01 15 00.5           ~ 2 0
21 [SCK2011] G34.26+0.15 A Rad 18 53 18.79 +01 14 56.3           ~ 2 0
22 [SCK2011] G45.07+0.13 SW Rad 19 13 21.83 +10 50 48.2           ~ 1 0
23 GRS G045.07 +00.13 Rad 19 13 22 +10 50.9           ~ 21 0
24 MSX6C G045.0711+00.1325 HII 19 13 22.0 +10 50 54           ~ 117 0
25 SSTGLMA G045.0712+00.1321 MIR 19 13 22.1 +10 50 53           ~ 2 0
26 ICRF J192559.6+210626 BLL 19 25 59.60535560 +21 06 26.1620442           ~ 184 1
27 GRS G075.78 +00.34 HII 20 21 43.6 +37 26 36           ~ 15 0
28 [WBN74] NGC 7538 IRS 1 Y*O 23 13 45.318 +61 28 11.69           ~ 380 3

    Equat.    Gal    SGal    Ecl

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2021.06.19-01:01:15

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