J/ApJS/194/32 The HII Region Discovery Survey (HRDS). II. (Anderson+, 2011)
The Green Bank Telescope H II Region Discovery Survey.
II. The source catalog.
Anderson L.D., Bania T.M., Balser D.S., Rood R.T.
<Astrophys. J. Suppl. Ser., 194, 32 (2011)>
=2011ApJS..194...32A 2011ApJS..194...32A
ADC_Keywords: H II regions ; Radio lines ; Infrared sources ; Surveys
Keywords: Galaxy: structure - H II regions - radio lines: ISM - surveys
Abstract:
The Green Bank Telescope (GBT) HII Region Discovery Survey has doubled
the number of known HII regions in the Galactic zone 343°≤l≤67°
with |b|≤1°. We detected 603 discrete hydrogen radio recombination
line (RRL) components at 9GHz (3cm) from 448 targets. Our targets were
selected based on spatially coincident mid-infrared and 20cm radio
continuum emission. Such sources are almost invariably HII regions; we
detected hydrogen RRL emission from 95% of our target sample. The
sensitivity of the GBT and the power of its spectrometer together made
this survey possible. Here, we provide a catalog of the measured
properties of the RRL and continuum emission from the survey nebulae.
The derived survey completeness limit, 180mJy at 9GHz, is sufficient
to detect all HII regions ionized by single O-stars to a distance of
12kpc. We discovered 34 first quadrant negative-velocity HII regions,
which lie at extreme distances from the Sun and appear to be part of
the Outer Arm. We found RRL emission from 208 Spitzer GLIMPSE 8.0um
"bubble" sources, 65 of which have been cataloged previously. It thus
appears that nearly all GLIMPSE bubbles are HII regions and that ∼50%
of all Galactic HII regions have a bubble morphology at 8.0um.
Description:
Our observations were made with the Green Bank Telescope (GBT) 100m
telescope from 2008 June through 2010 October.
We assembled our target list from the following multi-frequency, large
solid angle Galactic surveys: the NRAO Very Large Array (VLA) Galactic
Plane Survey at 21cm HI and continuum (VGPS: Stil et al.
2006AJ....132.1158S 2006AJ....132.1158S), the NRAO VLA Sky Survey at 20cm continuum (NVSS:
Condon et al. 1998, Cat. VIII/65), the Southern Galactic Plane Survey
at 21cm HI and continuum (SGPS: Haverkorn et al. 2006ApJS..167..230H 2006ApJS..167..230H),
the VLA MAGPIS at 20cm continuum (Helfand et al. 2006, Cat.
J/AJ/131/2525), and the Spitzer 24um MIPSGAL survey (Carey et al.
2009PASP..121...76C 2009PASP..121...76C). Our analysis here also uses 8.0um data from the
Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE:
Benjamin et al. 2003PASP..115..953B 2003PASP..115..953B), which were obtained with the
Infrared Array Camera (IRAC) on the Spitzer Space Telescope.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 85 448 Green Bank Telescope HRDS source catalog
table2.dat 64 603 GBT HRDS Hydrogen recombination line parameters
table3.dat 71 448 GBT HRDS radio continuum parameters
table4.dat 88 22 GBT HRDS targets not detected in radio
recombination line (RRL) emission
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See also:
II/293 : GLIMPSE Source Catalog (I + II + 3D) (IPAC 2008)
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
J/ApJ/690/706 : Distances of Galactic HII regions (Anderson+, 2009)
J/ApJ/670/428 : Bubbles in the galactic disk. II. (Churchwell+, 2007)
J/AJ/131/2525 : MAGPIS 20cm survey (Helfand+, 2006)
J/ApJ/649/759 : Bubbles in the galactic disk (Churchwell+, 2006)
J/ApJS/165/338 : Radio recombination lines in HII regions (Quireza+, 2006)
J/ApJ/653/1226 : Physical properties of galactic HII regions (Quireza+, 2006)
J/AJ/130/156 : Galactic radio compact HII regions at 1.4GHz (Giveon+, 2005)
J/A+A/432/737 : General Catalogue of 6.7GHz Methanol Masers (Pestalozzi+,
2005)
J/A+A/397/213 : Galactic HII regions (Paladini+, 2003)
J/A+AS/143/269 : 6.7GHz methanol maser emission survey (Szymczak+, 2000)
J/A+AS/134/115 : Medicina 6.7GHz methanol masers survey (Slysh+ 1999)
J/MNRAS/301/640 : Ultracompact H II regions studies. II. (Walsh+, 1998)
J/MNRAS/291/261 : Methanol maser of IRAS-selected sources (Walsh+ 1997)
J/A+AS/115/81 : A CS(2-1) survey of UC HII regions (Bronfman+, 1996)
J/A+AS/110/81 : Methanol masers towards IRAS sources (van der Walt+ 1995)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- HRDS Source identification (GLLL.lll+B.bbb)
16- 22 F7.3 deg GLON Galactic longitude
24- 29 F6.3 deg GLAT Galactic latitude
31- 32 I2 h RAh Hour of Right Ascension (J2000)
34- 35 I2 min RAm Minute of Right Ascension (J2000)
37- 40 F4.1 s RAs Second of Right Ascension (J2000)
42 A1 --- DE- Sign of the Declination (J2000)
43- 44 I2 deg DEd Degree of Declination (J2000)
46- 47 I2 arcmin DEm Arcminute of Declination (J2000)
49- 50 I2 arcsec DEs Arcsecond of Declination (J2000)
52- 56 F5.1 km/s CH3OH ? Methanol maser velocity (1)
58- 62 F5.1 km/s CS ? CS velocity (2)
64- 65 A2 --- f_CS [ND] ND: CS not detected (2)
67- 68 A2 --- Morph Classification (G1)
70- 80 A11 --- Bubble Bubble identification (G2)
82- 85 A4 --- Rem Remarks about the source (3)
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Note (1): Maser velocity is that of the emission component with the highest
intensity. Compiled by Pestalozzi et al. (2005, Cat. J/A+A/432/737)
from observations by Caswell et al. (1995MNRAS.272...96C 1995MNRAS.272...96C); Ellingsen
et al. (1996MNRAS.280..378E 1996MNRAS.280..378E); Gaylard & MacLeod (1993MNRAS.262...43G 1993MNRAS.262...43G);
MacLeod & Gaylard (1992MNRAS.256..519M 1992MNRAS.256..519M); Menten (1991ApJ...380L..75M 1991ApJ...380L..75M);
Schutte et al. (1993MNRAS.261..783S 1993MNRAS.261..783S); Slysh et al. (1999,
Cat. J/A+AS/134/115); Szymczak et al. (2000, Cat. J/A+AS/143/269;
2002A&A...392..277S 2002A&A...392..277S); van der Walt et al. (1995, Cat. J/A+AS/110/81)
and Walsh et al. (1997, Cat. J/MNRAS/291/261; 1998,
Cat. J/MNRAS/301/640).
Note (2): CS(2-1) from Bronfman, Nyman, and May (1996, Cat. J/A+AS/115/81).
Note (3): Note as follows:
Note = Additional note within text on this source (see Section 4.4);
PN? = Possible planetary nebula (see Section 4.4 and Section 5.5).
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- HRDS Source identification (GLLL.lll+B.bbb)
15 A1 --- m_HRDS Multiple velocity component (1)
17- 23 F7.3 deg GLON Galactic longitude
25- 30 F6.3 deg GLAT Galactic latitude
32- 36 F5.1 mK TL Line intensity
38- 40 F3.1 mK e_TL Uncertainty in TL
42- 45 F4.1 km/s FWHM FWHM line width
47- 49 F3.1 km/s e_FWHM Uncertainty in FWHM
51- 56 F6.1 km/s VLSR Local Standard of Rest velocity
58- 60 F3.1 km/s e_VLSR Uncertainty in VLSR
62- 64 F3.1 mK rms Observation r.m.s. noise
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Note (1): For sources with multiple velocity components detected along the
line of sight, the source names are given additional letters, "a",
"b", "c", or "d", in order of decreasing peak line intensity.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- HRDS Source identification (GLLL.lll+B.bbb)
16- 22 F7.3 deg GLON Galactic longitude
24- 29 F6.3 deg GLAT Galactic latitude
31- 34 I4 mK TRA Peak intensity in RA scan direction
36- 38 I3 mK e_TRA Uncertainty in TRA
40- 43 I4 mK TDec Peak intensity in Dec scan direction
45- 46 I2 mK e_TDec Uncertainty in TDec
48- 50 I3 arcsec ASRA FWHM angular size in RA scan direction
52- 53 I2 arcsec e_ASRA Uncertainty in ASRA
55- 57 I3 arcsec ASDec FWHM angular size in Dec scan direction
59- 60 I2 arcsec e_ASDec Uncertainty in ASDec
62- 65 I4 mJy S GBT integrated flux density at 8665MHz
67- 69 I3 mJy e_S Uncertainty in S
71 A1 --- Note Additional comment (4)
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Note (4): Note as follows:
C = Complex: Source has complex continuum structure; this single Gaussian
component model only crudely represents the true source characteristics
(see Section 3.2).
P = Peaked: Continuum peak lies within 10" of the nominal target position.
These are the highest quality continuum data.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- HRDS Source identification (GLLL.lll+B.bbb)
16- 17 A2 --- Morph Classification (G1)
19- 21 A3 --- Bubble Bubble identification (G2)
23- 69 A47 --- Comm Comments
71- 88 A18 --- Type Object type
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Global notes:
Note (G1): Classification of source structure as seen in Spitzer GLIMPSE 8um
emission as follows:
B = Bubble: 8 micron emission surrounding 24 micron and radio continuum
emission;
BB = Bipolar Bubble: two bubbles connected by a region of strong IR and
radio continuum emission;
PB = Partial Bubble: similar to "B" but not complete;
IB = Irregular Bubble: similar to "B" but with less well-defined structure;
C = Compact: resolved 8 micron emission with no hole in the center;
PS = Point Source: unresolved 8 micron emission;
I = Irregular: complex morphology not easily classified;
ND = Not Detected; source has no 8 micron emission.
Note (G2): We list the bubble identification name for sources in the
Churchwell et al. (2006, Cat. J/ApJ/649/759; <[CPA2006] WNNN> in
Simbad and 2007, Cat. J/ApJ/670/428; <[CWP2007] CW NNN> in Simbad)
IR bubble catalogs (see Section 4.3).
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History:
* 22-Sep-2011: From electronic version of the journal
* 27-Feb-2013: Corrected table2 (minus sign missing in VLSR column),
from author
Acknowledgements:
Loren D. Anderson, loren.dean.anderson(at)gmail.com
References:
Bania et al. Paper I. 2010ApJ...718L.106B 2010ApJ...718L.106B
Anderson et al. Paper III. 2012ApJ...754...62A 2012ApJ...754...62A Cat. J/ApJ/754/62
Wenger et al. Paper IV. 2013ApJ...764...34W 2013ApJ...764...34W Cat. J/ApJ/764/34
(End) Greg SChwarz [AAS], Emmanuelle Perret [CDS] 01-Aug-2011