J/A+A/628/A90 OH maser emission in THOR survey (Beuther+, 2019)
OH maser emission in the THOR survey of the northern Milky Way.
Beuther H., Walsh A., Wang Y., Rugel M., Soler J., Linz H., Kloessen R.S.,
Anderson L.D., Glover J.SUrquhardt.S.C.O., Billington S.J., Kainulainen J.,
Menten K.M., Roy N., Longmore S.N., Bigiel F.
<Astron. Astrophys. 628, A90 (2019)>
=2019A&A...628A..90B 2019A&A...628A..90B (SIMBAD/NED BibCode)
ADC_Keywords: Galactic plane ; Radio sources ; Masers
Keywords: stars: formation - ISM: clouds - ISM: kinematics and dynamics -
stars evolution - catalogs - masers
Abstract:
OH masers trace diverse physical processes, from the expanding
envelopes around evolved stars to star-forming regions or supernovae
remnants. Providing a survey of the ground-state OH maser transitions
in the northern hemisphere inner Milky Way facilitates the study of a
broad range of scientific topics.
We want to identify the ground-state OH masers at 18 cm wavelength in
the area covered by "The HI/OH/Recombination line survey of the
Milky Way (THOR)". We will present a catalogue of all OH maser
features and their possible associated environments.
The THOR survey covers longitude and latitude ranges of
14.3°<l<66.8° and b<±1.25°. All OH ground state lines
2{PI}3/2(J=3/2) at 1612 (F=1-2), 1665 (F=1-1), 1667 (F=2-2) and
1720MHz (F=2-1) have been observed, employing the Very Large Array
(VLA) in its C configuration. The spatial resolution of the data
varies between 12.5" and 19", the spectral resolution is 1.5km/s, and
the rms sensitivity of the data is 10mJy/beam per channel.
We identify 1585 individual maser spots (corresponding to single
spectral features) distributed over 807 maser sites (regions of size
∼103-104AU). Based on different criteria from spectral profiles to
literature comparison, we try to associate the maser sites with
astrophysical source types. Approximately 51% of the sites exhibit the
double-horned 1612MHz spectra typically emitted from the expanding
shells of evolved stars. The separations of the two main velocity
features of the expanding shells typically vary between 22 and 38km/s.
In addition to this, at least 20% of the maser sites are associated
with star-forming regions. While the largest fraction of 1720MHz maser
spots (21 out of 53) is associated with supernova remnants, a
significant fraction of the 1720MHz maser spots (17) are also
associated with star-forming regions. We present comparisons to the
thermal 13CO(1-0) emission as well as to other surveys of class II
CH3OH and H2O maser emission. The catalogue attempts to present
associations to astrophysical sources where available, and the full
catalogue is available in electronic form.
This OH maser catalogue presents a unique resource of stellar and
interstellar masers in the northern hemisphere. It provides the basis
for a diverse range of follow-up studies from envelopes around evolved
stars to star-forming regions and Supernova remnants.
Description:
Based on the HI/OH/Recombination line survey of the Milky Way (THOR),
we present an OH maser catalogue in the longitude/latitude ranges
14.3<l<66.8 and b<±1.25 degrees. All ground state OH lines at
1612, 1665, 1667 and 1720MHz are covered. In total, we identify 1585
individual maser spots distributed over 807 maser sites. Where
possible, associations with astrophysical source types are conveyed
(evolved stars, starforming regions, supernovae remnants).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 112 1585 THOR maser spot catalogue
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See also:
J/A+A/619/A124 : THOR survey in northern Galactic plane (Wang+, 2018)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name Name, GLL.LLL+B.bbb-NNNA, including the maser
frequency and spot label A.B
21- 22 I2 h RAh Right ascension (J2000.0)
24- 25 I2 min RAm Right ascension (J2000.0)
27- 32 F6.3 s RAs Right ascension (J2000.0)
34 A1 --- DE- Declination sign (J2000)
35- 36 I2 deg DEd Declination (J2000)
38- 39 I2 arcmin DEm Declination (J2000)
41- 45 F5.2 arcsec DEs Declination (J2000)
47- 53 F7.3 Jy Speak Peak flux density
55- 57 I3 mJy rms rms
59- 65 F7.3 Jy.km/s Sint Integrated flux density
67- 71 F5.1 km/s vpeak Peak velocity
73- 78 F6.2 km/s vmin Minimum velocity of maser spot
80- 85 F6.2 km/s vmax Maximum velocity of maser spot
87- 89 F3.1 arcsec Deltax Positional uncertainty along X
91- 93 F3.1 arcsec Deltay Positional uncertainty along Y
95-112 A18 ---- Assoc Associations (1)
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Note (1): Associations codes:
ES = evolved star
D = double peaked
D? = potentially double peaked with 2nd component either two weak to be
firmly identified or outside the imaged velocity range
BS, RS or wkS = in the GLIMPSE images a bright, red or weak star is seen
co-spatial with the maser site
SF = star formation
SNR = supernova remnant
PN = planetary nebula
Star = star
nPL = near a pulsar
Sim = according to Simbad database
rc = cm continuum emission from Wang et al. (2018. Cat. J/A+A/619/A124)
Previous literature entries are referenced as:
Bel13 = Beltran et al. (2013, Cat. J/A+A/552/A123)
Blo94 = Bloemmaert et al. (1994A&A...287..479B 1994A&A...287..479B)
Cas95 = Caswell et al. (1995MNRAS.272...96C 1995MNRAS.272...96C)
Cod10 = Codella et al. (2010A&A...510A..86C 2010A&A...510A..86C)
Dea07 = Deacon et al. (2007, Cat. J/ApJ/658/1096)
Deg04 = Deguchi et al. (2004, Cat. J/PASJ/56/765)
DiF08 = Di Francesco et al. (2008, Cat. J/ApJS/175/277)
Fel02 = Felli et al. (2002A&A...392..971F 2002A&A...392..971F)
He05 = He et al. (2005, Cat. J/A+A/434/201)
Hil05 = Hill et al. (2005, Cat. J/MNRAS/363/405)
Ima13 = Imai et al. (2013ApJ...773..182I 2013ApJ...773..182I)
Kwo97 = Kwok et al. (1997, Cat. J/ApJS/112/557)
Kur94 = Kurtz et al. (1994, Cat. J/ApJS/91/659)
Lou93 = Loup et al. (1993, Cat. J/A+AS/99/291)
Mot03 = Motte et al. (2003ApJ...582..277M 2003ApJ...582..277M)
MMB = Methanol Multibeam Survey Caswell et al. (2010MNRAS.404.1029C 2010MNRAS.404.1029C,
Cat. VIII/96), Green et al. (2010MNRAS.409..913G 2010MNRAS.409..913G, Cat. VIII/96),
Breen et al. (2015MNRAS.450.4109B 2015MNRAS.450.4109B)
Per09 = Peretto & Fuller (2009, Cat. J/A+A/505/405)
Pes05 = Petsalozzi et al. 2005, Cat. J/A+A/432/737)
Ros10 = Rosolowsky et al. (2010, Cat. J/ApJS/188/123)
Sev01 = Sevenster et al. (2001, Cat. J/A+A/366/481)
Tho06 = Thompson et al. (2006, Cat. J/A+A/453/1003)
Urq09 = Urquhart et al. (2009, Cat. J/A+A/501/539)
Wal98 = Walsh et al. (1998, Cat. J/MNRAS/301/640)
Win75 = Winnberg et al. (1975A&A....38..145W 1975A&A....38..145W)
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Acknowledgements:
Henrik Beuther, beuther(at)mpia.de
(End) Patricia Vannier [CDS] 26-Jul-2019