Probing The Local Environment of the Supernova Remnant HESS J1731-347 with CO and CS Observations

Abstract

The shell-type supernova remnant HESS J1731$-$347 emits TeV gamma-rays, and is a key object for the study of the cosmic ray acceleration potential of supernova remnants. We use 0.5-1 arcminute Mopra CO/CS(1-0) data in conjunction with HI data to calculate column densities towards the HESS J1731$-$347 region. We trace gas within at least four Galactic arms, typically tracing total (atomic+molecular) line-of-sight H column densities of 2-3$\times$10${}^{22}$ cm${}^{-2}$. Assuming standard X-factor values and that most of the HI/CO emission seen towards HESS J1731$-$347 is on the near-side of the Galaxy, X-ray absorption column densities are consistent with HI+CO-derived column densities foreground to, but not beyond, the Scutum-Crux Galactic arm, suggesting a kinematic distance of $\sim$3.2 kpc for HESS J1731$-$347. At this kinematic distance, we also find dense, infrared-dark gas traced by CS(1-0) emission coincident with the north of HESS J1731$-$347, the nearby HII region G353.43$-$0.37 and the nearby unidentified gamma-ray source HESS J1729$-$345. This dense gas lends weight to the idea that HESS J1729$-$345 and HESS J1731-347 are connected, perhaps via escaping cosmic-rays.

arXiv comment16 pages, 13 figures, Accepted for publication in MNRAS

References in corpus (55)

• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• The CO-to-H2 Conversion Factor
• Detection of the Characteristic Pion-Decay Signature in Supernova Remnants
• The Relation Between Optical Extinction and Hydrogen Column Density in the Galaxy
• High-Mass Proto-Stellar Candidates - II : Density structure from dust continuum and CS emission
• Acceleration of petaelectronvolt protons in the Galactic Centre
• The Southern Galactic Plane Survey: HI Observations and Analysis
• Broad-band nonthermal emission from molecular clouds illuminated by cosmic rays from nearby supernova remnants
• Discovery of very high energy gamma-ray emission coincident with molecular clouds in the W28 (G6.4-0.1) field
• Toward Understanding the Cosmic-ray Acceleration at Young Supernova Remnants Interacting with Interstellar Clouds: Possible Applications to RX J1713.7-3946
• Intrinsically Red Sources observed by Spitzer in the Galactic Mid-Plane
• HESS VHE Gamma-Ray Sources Without Identified Counterparts
• A CS J=5-4 Mapping Survey Towards High-mass Star Forming Cores Associated with Water Masers
• The distribution of cosmic-ray sources in the Galaxy, gamma-rays, and the gradient in the CO-to-H2 relation
• Nonthermal Radiation of Young Supernova Remnants
• A Detailed Study of the Molecular and Atomic Gas Toward the γ-ray SNR RX J1713.7-3946: Spatial TeV γ-ray and ISM Gas Correspondence
• The Southern Galactic Plane Survey: Polarized Radio Continuum Observations and Analysis
• The CO luminosity and CO-H2 conversion factor of diffuse ISM: does CO emission trace dense molecular gas?
• TeV Gamma-Rays from Old Supernova Remnants
• A retrospective view of Miriad
• Hadronic gamma-rays from RX J1713.7-3946?
• The Mopra Southern Galactic Plane CO Survey
• The Molonglo Galactic Plane Survey: I. Overview and Images
• Radio Recombination Lines in Galactic HII Regions
• Discovery of the radio and X-ray counterpart of TeV Gamma-ray source HESS J1731-347
• A new SNR with TeV shell-type morphology: HESS J1731-347
• Star Forming Dense Cloud Cores in the TeV γ-ray SNR RX J1713.7-3946
• Comparative Chemistry of Diffuse Clouds IV: CH
• The neutron star in HESS J1731-347: CCOs as laboratories to study the equation of state of superdense matter
• Two Magnetar Candidates in HESS Supernova Remnants
• Study of TeV shell supernova remnants at gamma-ray energies
• Interstellar protons in the TeV gamma-ray SNR HESS J1731-347:Possible evidence for the coexistence of hadronic and leptonic gamma-rays
• An Energetic Magnetar in HESS J1713-381/CTB 37B
• A non-pulsating neutron star in the supernova remnant HESS J1731-347 / G353.6-0.7 with a carbon atmosphere
• X-ray emission from HESS J1731-347/SNR G353.6-0.7 and Central Compact Source XMMS J173203-344518
• HI, CO, and Dust in the Perseus Cloud
• A 7mm line survey of the shocked and disrupted molecular gas towards the W28 field TeV gamma-ray sources
• The start of the Sagittarius spiral arm (Sagittarius origin) and the start of the Norma spiral arm (Norma origin) - model-computed and observed arm tangents at galactic longitudes -20 degrees < l < +23 degrees
• A young SNR illuminating nearby Molecular Clouds with cosmic rays
• 3 to 12 millimetre studies of dense gas towards the western rim of supernova remnant RX J1713.7-3946
• Characterisation of the Mopra Radio Telescope at 16--50 GHz
• The Mopra Southern Galactic Plane CO Survey - Data Release 1
• Suzaku Observations of the Non-thermal Supernova Remnant HESS J1731-347
• 12mm line survey of the dense molecular gas towards the W28 field TeV gamma-ray sources
• Analyzing Neutron Star in HESS J1731-347 from Thermal Emission and Cooling Theory
• Interstellar gas towards the TeV gamma-ray sources HESS J1640-465 and HESS J1641-463
• Fermi Large Area Telescope observations of the supernova remnant HESS J1731-347
• Evidence for a binary origin of a central compact object
• Interstellar gas towards CTB 37A and the TeV gamma-ray source HESS J1714-385
• XMM-Newton observations of the non-thermal supernova remnant HESS J1731-347 (G353.6-0.7)
• Dense molecular gas at 12 mm towards Galactic TeV gamma-ray sources
• Ammonia excitation imaging of shocked gas towards the W28 gamma-ray source HESS J1801-233
• The TeV supernova remnant shell HESS J1731-347 and its surroundings
• A dense gas survey of the gamma-ray sources HESS J1731-347 and HESS J1729-345
• Molecular Shocks and the Gamma-ray Clouds of the W28 Supernova Remnant

Cited by in corpus (15)

• Upper Limit on the QCD Axion Mass from Isolated Neutron Star Cooling
• Thermal luminosities of cooling neutron stars
• Astrophysical Axion Bounds: The 2024 Edition
• A light strange star in the remnant HESS J1731-347: minimal consistency checks
• The Mopra Southern Galactic Plane CO Survey - Data Release 3
• Possible Evidence for Cosmic-Ray Acceleration in the Type Ia SNR RCW 86: Spatial Correlation between TeV Gamma rays and Interstellar Atomic Protons
• A kinematic study of central compact objects and their host supernova remnants
• Discovery of Shocked Molecular Clouds Associated with the Shell-Type Supernova Remnant RX J0046.5$-$7308 in the Small Magellanic Cloud
• Detection of GeV $\gamma$-ray emission in the direction of HESS J1731-347 with Fermi-LAT
• Electron Acceleration in Middle-age Shell-type $\gamma$-Ray Supernova Remnants
• Searching for an interstellar medium association for HESS J1534-571
• What causes the absence of pulsations in Central Compact Objects in Supernova Remnants?
• Is the SNR HESS J1731-347 colliding with molecular clouds?
• A Supernova Remnant Counterpart for HESS J1832-085
• On the Cooling of Compact Stars in Light of the HESS J1731-347 Remnant