1999ApJ...520..162J


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.19CEST17:40:44

1999ApJ...520..162J - Astrophys. J., 520, 162-172 (1999/July-3)

Low-velocity ionized winds from regions around young O stars.

JAFFE D.T. and MARTIN-PINTADO J.

Abstract (from CDS):

We have observed seven ultracompact H II regions in hydrogen recombination lines in the millimeter band. Toward four of these regions there is a high-velocity (FWHM 60-80 km.s–1) component in the line profiles. The high-velocity gas accounts for 35%-70% of the emission measure within the beam. We compare these objects with an additional seven similar sources we have found in the literature. The broad recombination line objects (BRLOs) make up about 30% of all sources in complexes containing ultracompact H II regions. Comparison of spectral line and continuum data implies that the BRLOs coincide with sources with rising spectral indices, ≥0.4 up to 100 GHz. Both the number of BRLOs and their frequency of occurrence within H II region complexes, when coupled with their small size and large internal motions, mean that the apparent contradiction between the dynamical and the population lifetimes for BRLOs is even more severe than for ultracompact H II regions as a whole. We evaluate a number of possible models for the origin of the broad recombination line emission. The lifetime, morphology, and rising spectral index of the sources argue for photoevaporated disks as the cause for BRLOs. Existing models for such regions, however, do not account for the large amounts of ionized gas observed at supersonic velocities.

Abstract Copyright:

Journal keyword(s): ISM: H II Regions - ISM: Jets and Outflows - Radio Lines: Stars - Stars: Mass Loss - Stars: Winds, Outflows

Simbad objects: 22

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Number of rows : 22

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 LDN 1448 DNe 03 22.5 +30 35           ~ 467 0
2 IRAS 03282+3035 cor 03 31 20.98 +30 45 30.1           ~ 160 0
3 NAME Orion Peak 1 PoC 05 35 13.57 -05 22 03.8           ~ 31 0
4 [RLK73] IRc 2 IR 05 35 14.51548 -05 22 30.5943           ~ 580 1
5 NAME Sgr B2 HII F HII 17 47 20.165 -28 23 04.77           ~ 18 0
6 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1943 1
7 GAL 005.88-00.41 HII 18 00 30.388 -24 04 00.20           ~ 301 0
8 W 31c HII 18 10 29.1 -19 56 05           ~ 302 0
9 OH 34.26 +0.15 SFR 18 53 18.54 +01 14 57.9           ~ 467 0
10 [DJW84] W49 A HII 19 10 12.93 +09 06 11.9           ~ 29 0
11 [DJW84] W49 B HII 19 10 13.19 +09 06 12.8           ~ 17 0
12 [DJW84] W49 C HII 19 10 13.19 +09 06 18.8           ~ 17 0
13 W 49n HII 19 10 13.2 +09 06 12           ~ 418 3
14 [DJW84] W49 G2 HII 19 10 13.47 +09 06 13.2           ~ 15 0
15 W 58a HII 20 01 45.8 +33 32 43           ~ 278 4
16 SH 2-106 HII 20 27 26.8 +37 22 49           ~ 411 2
17 EM* MWC 349 ** 20 32 45.499080 +40 39 36.74124   15.88 13.15 12.13   Bep 710 0
18 GRS G081.70 +00.50 SFR 20 39 01.6 +42 19 38           O4.5 948 0
19 NGC 7538 OpC 23 13 37 +61 30.0           ~ 831 0
20 [WBN74] NGC 7538 IRS 3 Y*? 23 13 43.646 +61 28 14.02           ~ 63 0
21 [WBN74] NGC 7538 IRS 1 Y*O 23 13 45.318 +61 28 11.69           ~ 369 3
22 [WBN74] NGC 7538 IRS 2 Y*? 23 13 45.474 +61 28 19.87           ~ 71 0

    Equat.    Gal    SGal    Ecl

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2020.10.19-17:40:44

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