2001A&A...367..635F


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.29CET07:21:18

2001A&A...367..635F - Astronomy and Astrophysics, volume 367, 635-651 (2001/2-4)

The galactic plane region near l=93°. I. HII region NRAO 655.

FOSTER T. and ROUTLEDGE D.

Abstract (from CDS):

We present new Canadian Galactic Plane Survey radio continuum and λ21 cm HI line observations of NRAO 655 (G93.4+1.8), plus radio recombination line observations, and optical H α-line observations. The radio spectrum of NRAO 655 confirms its emission as thermal. From the λ21 cm HI data we find an atomic hydrogen cavity associated with this object at v ≃-71.5km/s. The cavity corresponds in position and size to the brightest radio continuum emission from NRAO 655. The corresponding kinematic distance is 8.8kpc, placing NRAO 655 in the Perseus Arm. NRAO 655's linear size is therefore 70pcx130pc. To confirm the λ21 cm HI velocity we present the first recombination line detection of NRAO 655 (H158 α line, v≃-71km/s), and the first observations of a molecular cloud coinciding with NRAO 655 (at v≃-72km/s). The first optical detection of λ656nm Hα emission line features in NRAO 655 is also presented, and the H α emission line brightness is determined. We suggest that the eastward extension of this strongly asymmetric object originates in a champagne outflow, and we estimate its age. We show that a single early-type star cannot be responsible for the outflow, whereas a group of later-type stars would suffice. A partial HI shell is seen adjacent to the brightest part of NRAO 655; we suggest that it has been formed by dissociation of H2 in the molecular cloud.

Abstract Copyright:

Journal keyword(s): HII regions - radio continuum: ISM - radio lines: ISM - ISM: jets and outflows - ISM: individual objects: NRAO 655

Simbad objects: 15

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Number of rows : 15

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 Per Arm PoG 03 30 +45.0           ~ 1280 0
2 M 57 PN 18 53 35.0969571234 +33 01 44.883146221   15.405 15.769 15.901 16.062 DA(O?) 794 2
3 IRAS 21078+5211 HII 21 09 25.2 +52 23 44           ~ 41 0
4 BG 2107+49 HII 21 09.6 +49 59           ~ 13 0
5 GAL 093.06+02.81 HII 21 12 21.1 +52 28 59           ~ 29 0
6 GAL 092.3+01.5 Rad 21 14 32 +51 02.5           ~ 2 0
7 NRAO 652 HII 21 15.6 +51 53           ~ 4 0
8 GRS G093.66 +02.57 Rad 21 16 18.6 +52 47 36           ~ 8 0
9 SNR G093.4+01.8 SNR 21 18 52.9 +51 56 59           ~ 18 0
10 KR 6 Rad 21 19 11.0 +53 20 07           ~ 6 0
11 IRAS 21190+5140 HII 21 20 44.8 +51 53 28           ~ 128 2
12 IRAS 21202+5157 HII 21 21 53.577 +52 10 47.30           ~ 24 0
13 SNR G094.0+01.0 SNR 21 24 50 +51 53.0           ~ 79 0
14 CTB 104 Rad 21 32.1 +50 51           ~ 16 1
15 NAME Outer Arm PoG 21 48 +69.4           ~ 227 0

    Equat.    Gal    SGal    Ecl

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2020.11.29-07:21:18

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