J/MNRAS/420/1656 RMS compact HII regions distances (Urquhart+, 2012)
The RMS survey: resolving kinematic distance ambiguities towards a sample of
compact H II regions using H I absorption.
Urquhart J.S., Hoare M.G., Lumsden S.L., Oudmaijer R.D., Moore T.J.T.,
Mottram J.C., Cooper H.D.B., Mottram M., Rogers H.C.
<Mon. Not. R. Astron. Soc., 420, 1656-1672 (2012)>
=2012MNRAS.420.1656U 2012MNRAS.420.1656U
ADC_Keywords: H II regions ; Radio lines
Keywords: stars: early-type - stars: formation - ISM: clouds -
Galaxy: kinematics and dynamics
Abstract:
We present high-resolution HI data obtained using the Australia
Telescope Compact Array to resolve the near/far distance ambiguities
towards a sample of compact HII regions from the Red MSX Source (RMS)
survey. The high-resolution data are complemented with lower
resolution archival HI data extracted from the Southern and Very Large
Array (VLA) Galactic Plane surveys. We resolve the distance ambiguity
for nearly all of the 105 sources where the continuum was strong
enough to allow analysis of the HI absorption line structure. This
represents another step in the determination of distances to the total
RMS sample, which with over 1000 massive young stellar objects and
compact HII regions is the largest and most complete sample of its
kind. The full sample will allow the distribution of massive star
formation in the Galaxy to be examined.
Description:
Observations were made using the Australia Telescope Compact Array
(ATCA) between the 2008 January 24 and 28.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 59 69 Summary of fields observed, synthesized beam
parameters and rms of the restored images
table2.dat 70 79 Radio source parameters
table3.dat 109 105 *Summary of measured source, tangent and absorption
velocities, kinematic distances and results of our
Kinematic Distance Ambiguity (KDA) analysis
--------------------------------------------------------------------------------
Note on table3.dat: computed with the assumption for a distance to Galactic
Center of 8.5kpc, and a velocity at the position of the Sun of 220km/s
--------------------------------------------------------------------------------
See also:
V/114 : MSX6C Infrared Point Source Catalog (Egan+ 2003)
J/A+AS/115/81 : A CS(2-1) survey of UC HII regions (Bronfman+, 1996)
J/A+AS/120/283 : Water maser features in UC HII regions (Hofner+ 1996)
J/A+A/336/339 : VLA observations of ultracompact HII regions (Molinari+ 1998)
J/MNRAS/301/640 : Ultracompact H II regions studies. II. (Walsh+, 1998)
J/ApJS/138/63 : H2CO and Halpha observations of UC HII (Araya+, 2002)
J/ApJ/587/714 : H2CO and Halpha observations of UC HII (Watson+, 2003)
J/ApJS/155/123 : JHKs photometry of ultracompact HII regions (Alvarez+, 2004)
J/A+A/417/615 : Maser and outflows in UC HII region (Codella+, 2004)
J/A+A/453/1003 : SCUBA ultracompact HII regions (Thompson+, 2006)
J/ApJS/91/659 : Ultracompact HII regions radio images (Kurtz+ 1994)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- MSX Field name, GLLL.llll-BB.bbbb
18 A1 --- n_MSX [*] no radio emission detected
20- 21 I2 h RAh Right ascension (J2000)
23- 24 I2 min RAm Right ascension (J2000)
26- 30 F5.2 s RAs Right ascension (J2000)
32 A1 --- DE- Declination sign (J2000)
33- 34 I2 deg DEd Declination (J2000)
36- 37 I2 arcmin DEm Declination (J2000)
39- 42 F4.1 arcsec DEs Declination (J2000)
44- 47 F4.1 arcsec Size1 Size (Beam parameters)
48 A1 --- --- [x]
49- 51 F3.1 arcsec Size2 Size (Beam parameters)
53- 55 I3 deg PA [-90/90] Position angle (Beam parameters)
57- 59 F3.1 mJy rms Image rms
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- MSX Field name, GLLL.llll-BB.bbbb
19- 20 I2 h RAh Right ascension (J2000)
22- 23 I2 min RAm Right ascension (J2000)
25- 30 F6.3 s RAs Right ascension (J2000)
32 A1 --- DE- Declination sign (J2000)
33- 34 I2 deg DEd Declination (J2000)
36- 37 I2 arcmin DEm Declination (J2000)
39- 43 F5.2 arcsec DEs Declination (J2000)
45- 49 F5.1 mJy Speak Peak HI flux density
51- 56 F6.1 mJy Sint Integrated HI flux density
58- 61 F4.1 arcsec Size1 Size (Beam parameters)
62 A1 --- --- [x]
63- 66 F4.1 arcsec Size2 Size (Beam parameters)
68- 70 I3 deg PA [-90/90] Position angle (Beam parameters)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- MSX MSX name, GLLL.llll-BB.bbbb (Cat. V/114)
18 A1 --- u_MSX [+] results obtained from low-resolution data
20- 21 I2 h RAh Right ascension (J2000)
23- 24 I2 min RAm Right ascension (J2000)
26- 30 F5.2 s RAs Right ascension (J2000)
32 A1 --- DE- Declination sign (J2000)
33- 34 I2 deg DEd Declination (J2000)
36- 37 I2 arcmin DEm Declination (J2000)
39- 42 F4.1 arcsec DEs Declination (J2000)
44- 49 F6.1 km/s Vs Source velocity (measured Vlsr)
51- 56 F6.1 km/s Vt Tangent velocity (measured Vlsr)
58- 63 F6.1 km/s Va Absorption velocity (measured Vlsr)
65- 67 F3.1 kpc Dnear Inner Galaxy circular orbit near distance (1)
69- 72 F4.1 kpc Dfar Inner Galaxy circular orbit far distance (1)
74- 76 F3.1 kpc RGC Distance from the Galactic center (1)
78- 79 A2 --- KDA [fn? tp] KDA solution (2)
81- 85 F5.2 kpc Dist ?=- Distance
86 A1 --- n_Dist [*] Distance from the literature (3)
87 I1 --- r_Dist ? Reference for adopted distance value (4)
89- 94 F6.1 pc z ?=- Galactic scale height
96 A1 --- l_logL Limit flag on logL
97- 99 F3.1 [Lsun] logL ?=- Bolometric luminosity of the HII region
101-109 A9 --- Ref References (4)
--------------------------------------------------------------------------------
Note (1): distance in Galactic rotation model
Note (2): Kinematic Distance Ambiguity resolution:
f = far
n = near
tp = tangent
blank = ambiguous distance; this case concerns the ten sources that are
located between the gray branches of Fig.5
Note (3): * for distance that have been assigned using information taken from
the literature are discussed in Section 3.2. If a more reliable distance is
available for a particular source or complex, we have adopted this value.
Note (4): References as follows:
1 = Sewilo et al. (2004, cat. J/ApJS/154/553)
2 = Blum, Damineli & Conti (2001AJ....121.3149B 2001AJ....121.3149B)
3 = Furness et al. (2010MNRAS.403.1433F 2010MNRAS.403.1433F)
4 = Moises et al. (2011, Cat. J/MNRAS/411/705)
5 = Xu et al. (2011ApJ...733...25X 2011ApJ...733...25X)
6 = Kolpak et al. (2003, Cat. J/ApJ/582/75)
7 = Pandian, Momjian & Goldsmith (2008)
8 = Watson et al. (2003, Cat. J/ApJ/587/714)
9 = Caswell et al. (1975A&A....45..239C 1975A&A....45..239C)
10 = Green & McClure-Griffiths (2011)
11 = Busfield et al. (2006, Cat. J/MNRAS/366/1096)
12 = Fish et al. (2003ApJ...587..701F 2003ApJ...587..701F)
13 = Caswell & Haynes (1987, Cat. J/A+A/171/261)
14 = Anderson & Bania (2009, Cat. J/ApJ/690/706)
15 = Haynes et al. (1979MNRAS.188...13H 1979MNRAS.188...13H)
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 19-Feb-2014