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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
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), 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), 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). Our analysis here also uses 8.0um data from the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE: Benjamin et al. 2003PASP..115..953B), which were obtained with the Infrared Array Camera (IRAC) on the Spitzer Space Telescope. File Summary:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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)
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); Ellingsen et al. (1996MNRAS.280..378E); Gaylard & MacLeod (1993MNRAS.262...43G); MacLeod & Gaylard (1992MNRAS.256..519M); Menten (1991ApJ...380L..75M); Schutte et al. (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); 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).
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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
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.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
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)
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.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
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
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).
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 Anderson et al. Paper III. 2012ApJ...754...62A Cat. J/ApJ/754/62 Wenger et al. Paper IV. 2013ApJ...764...34W
(End) Greg SChwarz [AAS], Emmanuelle Perret [CDS] 01-Aug-2011
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