The Bolocam Galactic Plane Survey. X. A Complete Spectroscopic Catalog of Dense Molecular Gas Observed toward 1.1 mm Dust Continuum Sources with 7.5 <= l <= 194 degrees

Abstract

The Bolocam Galactic Plane Survey (BGPS) is a 1.1 mm continuum survey of dense clumps of dust throughout the Galaxy covering 170 square degrees. We present spectroscopic observations using the Heinrich Hertz Submillimeter Telescope of the dense gas tracers, HCO+ and N2H+ 3-2, for all 6194 sources in the Bolocam Galactic Plane Survey v1.0.1 catalog between 7.5 <= l <= 194 degrees. 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 N2H+ 3-2 emission (T_{mb} > 0.5 K) 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 NH3 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 N2H+ than HCO+ integrated intensity, but we find no correlations between the N2H+ / HCO+ ratio and 1.1 mm continuum flux density, gas kinetic temperature, or line width. Self-absorbed profiles are rare (1.3%).

Accepted for publication in ApJS. The full velocity catalog and data tables (complete Tables 2,3, and 5) may be downloaded from http://eldora.as.arizona.edu/~yshirley/Arizona/BGPS/ Kinematic finder charts (0.5 deg x 0.5 deg) are also available at the same address

References in corpus (10)

• Trigonometric Parallaxes of Massive Star Forming Regions: VI. Galactic Structure, Fundamental Parameters and Non-Circular Motions
• The Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey
• Kinematic Distances to Molecular Clouds identified in the Galactic Ring Survey
• The Bolocam Galactic Plane Survey IX: Data Release 2 and Outer Galaxy Extension
• The first Hi-GAL observations of the outer Galaxy: a look to star formation in the third Galactic quadrant in the longitude range 216.5 < l < 225.5
• A self-consistent model of Galactic stellar and dust infrared emission and the abundance of polycyclic aromatic hydrocarbons
• The Bolocam Galactic Plane Survey. VIII. A Mid-Infrared Kinematic Distance Discrimination Method
• Characterization of the MALT90 Survey and the Mopra Telescope at 90 GHz
• Chemical differentiation in regions of high-mass star formation I. CS, dust and N2H^+ in southern sources
• Millimetre-Wave and Near-Infrared Signposts of Massive Molecular Clump Evolution and Star Cluster Formation

Cited by in corpus (51)

• The Critical Density and the Effective Excitation Density of Commonly Observed Molecular Dense Gas Tracers
• How to Calculate Molecular Column Density
• ATLASGAL --- properties of a complete sample of Galactic clumps
• The ALMA Survey of 70 $\mu$m dark High-mass clumps in Early Stages (ASHES). I. Pilot Survey: Clump Fragmentation
• Giant Molecular Filaments in the Milky Way
• A Massive Prestellar Clump Hosting no High-Mass Cores
• ATLASGAL -- A Galaxy-wide sample of dense filamentary structures
• A Model for the Onset of Self-gravitation and Star Formation in Molecular Gas Governed by Galactic Forces: I. Cloud-scale Gas Motions
• The Bolocam Galactic Plane Survey. XIV. Physical Properties of Massive Starless and Star Forming Clumps
• The Physical Properties of Large-Scale Galactic Filaments
• Star Formation Relations in the Milky Way
• The Skeleton of the Milky Way
• The Physical Conditions in a Pre Super Star Cluster Molecular Cloud in the Antennae Galaxies
• The integrated properties of the molecular clouds from the JCMT CO(3-2) High Resolution Survey
• A Census of Large-Scale ($\ge$ 10 pc), Velocity-Coherent, Dense Filaments in the Northern Galactic Plane: Automated Identification Using Minimum Spanning Tree
• Offset between stellar spiral arms and gas arms of the Milky Way
• Monitoring observations of 6.7 GHz methanol masers
• The Bolocam Galactic Plane Survey. XII. Distance Catalog Expansion Using Kinematic Isolation of Dense Molecular Cloud Structures With 13CO(1-0)
• High-mass Starless Clumps in the inner Galactic Plane: the Sample and Dust Properties
• A population of hypercompact HII regions identified from young HII regions
• SEDIGISM-ATLASGAL: Dense Gas Fraction and Star Formation Efficiency Across the Galactic Disk
• Star formation around mid-infrared bubble N37: Evidence of cloud-cloud collision
• The chemical structure of young high-mass star-forming clumps: (II) parsec-scale CO depletion and deuterium fraction of $\mathrm{HC}{\mathrm{O}}^{+}$
• The shortest periodic and flaring flux variability of a methanol maser emission at 6.7 GHz in G 014.23-00.50
• How galactic environment regulates star formation
• Parallaxes for star forming regions in the inner Perseus spiral arm
• The chemical structure of young high-mass star-forming clumps: (I) Deuteration
• Outflows, Dusty Cores, and a Burst of Star Formation in the North America and Pelican Nebulae
• Clustered star formation at early evolutionary stages. Physical and chemical analysis of the young star-forming regions ISOSS J22478+6357 and ISOSS J23053+5953
• The Bolocam Galactic Plane Survey. XIII. Physical Properties and Mass Functions of Dense Molecular Cloud Structures
• Searching for Inflow Towards Massive Starless Clump Candidates Identified in the Bolocam Galactic Plane Survey
• The physical environment around IRAS 17599-2148: infrared dark cloud and bipolar nebula
• Vertical Structure and Kinematics of the Galactic Outer Disk
• The Star Formation Relation for Regions in the Galactic Plane: The Effect of Spatial Resolution
• Star formation activity in the neighbourhood of W-R 1503-160L star in the mid-infrared bubble N46
• VERA astrometry toward the Perseus arm gap
• Wide Field CO Mapping in the Region of IRAS 19312+1950
• The link between gas and stars in the S254-S258 star-forming region
• High-Mass Starless Clumps: Dynamical State and Correlation Between Physical Parameters
• A multi-wavelength analysis of the diffuse HII region G25.8700+0.1350
• Gas kinematics in massive star-forming regions from the Perseus spiral arm
• Early Science with the Large Millimetre Telescope: Fragmentation of molecular clumps in the Galaxy
• A statistical study towards the high-mass BGPS clumps with the MALT90 survey
• The ALMA Survey of 70 $\mu$m Dark High-mass Clumps in Early Stages (ASHES). XII. Unanchored Forked Stream in the Propagating Path of a Protostellar Outflow
• The molecular environment of the pillar-like features in the HII region G46.5-0.2
• Northern Galactic Molecular Cloud Clumps in Hi-GAL: Clump and Star Formation within Clouds
• A search for High Mass Stars Forming in Isolation using CORNISH & ATLASGAL
• Northern Galactic Molecular Cloud Clumps in Hi-GAL: Dense Gas Map and Environmental Trends
• A Refined Sample of Lyman Excess H II Regions
• A distant OB association around RAFGL 5475
• Star Formation at the Periphery of a Molecular Superbubble: The Case of G12.79+0.43