OGHReS: Large-scale filaments in the outer Galaxy

Abstract

Filaments are a ubiquitous morphological feature of the molecular interstellar medium and are identified as sites of star formation. In recent years, more than 100 large-scale filaments (with a length $>10$\,pc) have been observed in the inner Milky Way. As they appear linked to Galactic dynamics, studying those structures represents an opportunity to link kiloparsec-scale phenomena to the physics of star formation, which operates on much smaller scales. In this letter, we use newly acquired Outer Galaxy High Resolution Survey (OGHReS) ${}^{12}$CO(2-1) data to demonstrate that a significant number of large-scale filaments are present in the outer Galaxy as well. The 37 filaments identified appear tightly associated with inter-arm regions. In addition, their masses and linear masses are, on average, one order of magnitude lower than similar-sized molecular filaments located in the inner Galaxy, showing that Milky Way dynamics is able to create very elongated features in spite of the lower gas supply in the Galactic outskirts.

arXiv comment5 pages (+ appendices, 9 pages), 8 figures, 1 table, accepted for publication in A&A Letters

References in corpus (65)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Astropy: A Community Python Package for Astronomy
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• The CO-to-H2 Conversion Factor
• From filamentary clouds to prestellar cores to the stellar IMF: Initial highlights from the Herschel Gould Belt survey
• Trigonometric Parallaxes of High Mass Star Forming Regions: the Structure and Kinematics of the Milky Way
• GLIMPSE: I. A SIRTF Legacy Project to Map the Inner Galaxy
• Characterizing interstellar filaments with Herschel in IC5146
• Trigonometric Parallaxes Of High-Mass Star Forming Regions: Our View Of The Milky Way
• ATLASGAL - The APEX Telescope Large Area Survey of the Galaxy at 870 microns
• The Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey
• The CO-to-H2 Conversion Factor and Dust-to-Gas Ratio on Kiloparsec Scales in Nearby Galaxies
• Structural Analysis of Molecular Clouds: Dendrograms
• Cores, filaments, and bundles: hierarchical core formation in the L1495/B213 Taurus region
• Physical properties of molecular clouds for the entire Milky Way disk
• Cluster-formation in the Rosette molecular cloud at the junctions of filaments
• Bias-free Measurement of Giant Molecular Cloud Properties
• The Equilibrium State of Molecular Regions in the Outer Galaxy
• A Parallax-based Distance Estimator for Spiral Arm Sources
• The Turbulent Shock Origin of Proto--Stellar Cores
• Filamentary structures and compact objects in the Aquila and Polaris clouds observed by Herschel
• Dawes Review 4: Spiral Structures in Disc Galaxies
• The "Nessie" Nebula: Cluster Formation in a Filamentary Infrared Dark Cloud
• The Exciting Lives of Giant Molecular Clouds
• On the nature of star-forming filaments: I. Filament morphologies
• On the Structure of the Orion A Cloud and the Formation of the Orion Nebula Cluster
• Large-scale filaments associated with Milky Way spiral arms
• Giant Molecular Filaments in the Milky Way
• The Bones of the Milky Way
• Revealing the physical properties of molecular gas in Orion with a large scale survey in J=2-1 lines of 12CO, 13CO and C18O
• The Southern Galactic Plane Survey: Polarized Radio Continuum Observations and Analysis
• SEDIGISM: Structure, excitation, and dynamics of the inner Galactic interstellar medium
• 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
• ATLASGAL -- A Galaxy-wide sample of dense filamentary structures
• The Cloud Factory I: Generating resolved filamentary molecular clouds from galactic-scale forces
• The Physical Properties of Large-Scale Galactic Filaments
• The Three-mm Ultimate Mopra Milky Way Survey. I. Survey Overview, Initial Data Releases, and First Results
• The Musca cloud: A 6 pc-long velocity-coherent, sonic filament
• The SEDIGISM survey: first data release and overview of the Galactic structure
• The Skeleton of the Milky Way
• Fragmentation of Shocked Flows: Gravity, Turbulence and Cooling
• The Hi-GAL catalogue of dusty filamentary structures in the Galactic Plane
• Galactocentric variation of the gas-to-dust ratio and its relation with metallicity
• A Census of Large-Scale ($\ge$ 10 pc), Velocity-Coherent, Dense Filaments in the Northern Galactic Plane: Automated Identification Using Minimum Spanning Tree
• What can simulated molecular clouds tell us about real molecular clouds?
• The CARMA-NRO Orion Survey: The filamentary structure as seen in C${}^{18}$O emission
• Investigating the structure and fragmentation of a highly filamentary IRDC
• Giant molecular filaments in the Milky Way II: The fourth Galactic quadrant
• The SEDIGISM survey: Molecular clouds in the inner Galaxy
• Star-forming content of the giant molecular filaments in the Milky Way
• ${}^{13}\mathrm{CO}$ Filaments in the Taurus Molecular Cloud
• The evolution of Giant Molecular Filaments
• SEDIGISM: The kinematics of ATLASGAL filaments
• Tracing the Spiral Structure of the Outer Milky Way with Dense Atomic Hydrogen Gas
• First Parallax Measurements Towards a 6.7 GHz Methanol Maser with the Australian Long Baseline Array - Distance to G339.884-1.259
• Structure and Fragmentation of a high line-mass filament: Nessie
• SEDIGISM-ATLASGAL: Dense Gas Fraction and Star Formation Efficiency Across the Galactic Disk
• Parallaxes of 6.7-GHz Methanol Masers towards the G305.2 High-Mass Star Formation Region
• The Molecular Structures of Local Arm and Perseus Arm in the Galactic Region of l=[139.75,149.75]${}^{\circ }$, b=[-5.25,5.25]${}^{\circ }$
• The QUaD Galactic Plane Survey II: A Compact Source Catalog
• Molecular cloud catalogue from ${}^{13}$CO(1-0) data of the Forgotten Quadrant Survey
• Synthetic Large-Scale Galactic Filaments -- on their Formation, Physical Properties, and Resemblance to Observations
• Census of High- and Medium-mass Protostars V. CO Abundance and the Galactic $X_{\text{CO}}$ Factor
• A Cold and Diffuse Giant Molecular Filament in the Region of $l=41^{\circ }$, $b=-1^{\circ }$
• A New Search for Star Forming Regions in the Southern Outer Galaxy

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• PHANGS--JWST First Results: ISM structure on the turbulent Jeans scale in four disk galaxies observed by JWST and ALMA
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