J/ApJS/209/2 The BGPS. X. Dense molecular gas (Shirley+, 2013) ================================================================================ The Bolocam Galactic Plane Survey. X. A complete spectroscopic catalog of dense molecular gas observed toward 1.1mm dust continuum sources with 7.5{deg}<=l<=194{deg}. Shirley Y.L., Ellsworth-Bowers T.P., Svoboda B., Schlingman W.M., Ginsburg A., Rosolowsky E., Gerner T., Mairs S., Battersby C., Stringfellow G., Dunham M.K., Glenn J., Bally J. =2013ApJS..209....2S ================================================================================ ADC_Keywords: Interstellar medium ; Milky Way ; Radio lines ; Surveys Keywords: Galaxy: kinematics and dynamics - ISM: clouds - ISM: structure - radio lines: ISM - stars: formation - surveys Abstract: The Bolocam Galactic Plane Survey (BGPS) is a 1.1 mm continuum survey of dense clumps of dust throughout the Galaxy covering 170deg^2^. We present spectroscopic observations using the Heinrich Hertz Submillimeter Telescope of the dense gas tracers, HCO^+^ and N_2_H^+^3-2, for all 6194 sources in the BGPS v1.0.1 catalog between 7.5{deg}<=l<=194{deg}. This is the largest targeted spectroscopic survey of dense molecular gas in the Milky Way to date. We find unique velocities for 3126 (50.5%) of the BGPS v1.0.1 sources observed. Strong N_2_H^+^ 3-2 emission (T_mb_>0.5K) without HCO^+^ 3-2 emission does not occur in this catalog. We characterize the properties of the dense molecular gas emission toward the entire sample. HCO^+^ is very sub-thermally populated and the 3-2 transitions are optically thick toward most BGPS clumps. The median observed line width is 3.3 km/s consistent with supersonic turbulence within BGPS clumps. We find strong correlations between dense molecular gas integrated intensities and 1.1 mm peak flux and the gas kinetic temperature derived from previously published NH_3_observations. These intensity correlations are driven by the sensitivity of the 3-2 transitions to excitation conditions rather than by variations in molecular column density or abundance. We identify a subset of 113 sources with stronger N_2_H^+^ than HCO^+^ integrated intensity, but we find no correlations between the N_2_H^+^/HCO^+^ ratio and 1.1 mm continuum flux density, gas kinetic temperature, or line width. Self-absorbed profiles are rare (1.3%). Description: In the range 7.5<=l<=194{deg} 4705 BGPS clumps were observed during 51 observing shifts between 2011 February 28 and 2012 December 8 with the 10m Heinrich Hertz Telescope (HHT). The source catalog was determined by observing all Bolocat v1.0.1 sources that were not previously observed by Schlingman et al. (Paper V, 2011, Cat. J/ApJS/195/14) plus re-observing sources where the pointing in Schlingman et al. exceeded half the HHT beamwidth (15") from the v1.0.1 catalog peak 1.1mm continuum position. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table2.dat 94 6194 HCO^+^ 3-2 (267.5576GHz) observed properties table3.dat 68 6194 N_2_H^+^ 3-2 (279.5118379GHz) observed properties table5.dat 28 80 HCO^+^ 3-2 line asymmetries -------------------------------------------------------------------------------- See also: J/MNRAS/422/3178 : Distances of 793 BGPS sources (Eden+, 2012) J/ApJ/741/110 : The BGPS. VII. Massive star-forming regions (Dunham+, 2011) J/ApJS/196/12 : First results from Mopra HCO^+^ maps (Barnes+, 2011) J/ApJS/195/14 : The BGPS. Paper V. (Schlingman+, 2011) J/AJ/142/94 : Red MSX sources in BGPS (Schenck+, 2011) J/ApJ/721/137 : The Bolocam Galactic Plane Survey (BGPS) (Bally+, 2010) J/ApJS/188/123 : The Bolocam Galactic Plane Survey. II. (Rosolowsky+, 2010) Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 I4 --- Seq [1307/7514] Source number 6- 20 A15 --- BGPS Source name (GLLL.lll+BB.bbb) 22- 23 I2 h RAh [2/23] Hour of Right Ascension (J2000) 25- 26 I2 min RAm Minute of Right Ascension (J2000) 28- 31 F4.1 s RAs Second of Right Ascension (J2000) 33 A1 --- DE- [-] Sign of the Declination (J2000) 34- 35 I2 deg DEd [0/62] Degree of Declination (J2000) 37- 38 I2 arcmin DEm Arcminute of Declination (J2000) 40- 43 F4.1 arcsec DEs Arcsecond of Declination (J2000) 45 I1 --- Cat [1/2] Known (1) or new (2) source (G1) 47 I1 --- HCO [0/3] Detection flag, 1=ok (G2) 49- 53 F5.1 km/s vLSR [-73.6/154.8]? Local Standard of Rest velocity 55- 60 F6.3 K Tmb [0.09/18.5]? Peak main beam temperature 62- 66 F5.3 K e_Tmb The 1{sigma} main beam temperature 68- 74 F7.3 K.km/s I [0.20/151.7]? Integrated intensity 76- 80 F5.3 K.km/s e_I ? The 1{sigma} uncertainty in I 82- 85 F4.1 km/s Delv [0.4/25]? Full-width at Half-Maximum 87- 89 F3.1 km/s e_Delv ? The 1{sigma} uncertainty in Delv 91- 94 F4.1 km/s FWZI [1.1/49.3]? Full-Width at Zero-Intensity -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 I4 --- Seq [1307/7514] Source number 6- 20 A15 --- BGPS Source name (GLLL.lll+BB.bbb) 22 I1 --- Cat [1/2] Known (1) or new (2) source (G1) 24 I1 --- N2H [0/3] Detection flag, 1=ok (G2) 26- 30 F5.1 km/s vLSR [-66.4/155.3]? Local Standard of Rest velocity 32- 36 F5.3 K Tmb [0.08/7.4]? Peak main beam temperature 38- 42 F5.3 K e_Tmb The 1{sigma} main beam temperature 44- 49 F6.3 K.km/s I [-0.16/42.7]? Integrated intensity 51- 55 F5.3 K.km/s e_I ? The 1{sigma} uncertainty in I 57- 59 F3.1 km/s Delv [1.1/10]? Full-width at Half-Maximum 61- 63 F3.1 km/s e_Delv ? The 1{sigma} uncertainty in Delv 65- 68 F4.1 km/s FWZI [1/19.3]? Full-Width at Zero-Intensity -------------------------------------------------------------------------------- Byte-by-byte Description of file: table5.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 I4 --- Seq [1363/7493] Source number 6- 20 A15 --- BGPS Source name (GLLL.lll+BB.bbb) 22 I1 --- Cat [1/2] Known (1) or new (2) source (G1) 24 I1 --- HCO [3] The HCO^+^ flag, 1=ok (G2) 26 I1 --- N2H [0/3]? The N_2_H^+^ flag, 1=ok (G2) 28 A1 --- Asym [ber] HCO^+^ 3-2 line asymmetry flag (1) -------------------------------------------------------------------------------- Note (1): Asymmetry flag as follows: b = blue-asymmetry; r = red asymmetric; e = equal asymmetry. -------------------------------------------------------------------------------- Global notes: Note (G1): Catalog code: 1 = Schlingman et al. (2011, Cat. J/ApJS/195/14); 2 = new observations presented in this paper. Note (G2): Catalog detection flag as follows: 1 = single vLSR component detected at the >3{sigma}(Tmb) level; 2 = multiple vLSR components detected; 3 = source with possible self-absorption; 0 = a non-detection. -------------------------------------------------------------------------------- History: From electronic version of the journal References: Aguirre et al. Paper I. 2011ApJS..192....4A Rosolowsky et al. Paper II. 2010ApJS..188..123R Cat. J/ApJS/188/123 Dunham et al. Paper III. 2010ApJ...717.1157D Bally et al. 2010ApJ...721..137B Cat. J/ApJ/721/137 Schlingman et al. Paper V. 2011ApJS..195...14S Cat. J/ApJS/195/14 Dunham et al. Paper VII. 2011ApJ...741..110D Cat. J/ApJ/741/110 Ellsworth-Bowers et al. Paper VIII. 2013ApJ...770...39E Ginsburg et al. Paper IX. 2013ApJS..208...14G ================================================================================ (End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 15-Nov-2013