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OGHReS: Large-scale filaments in the outer Galaxy

Colombo, D., König, C., Urquhart, J. S., Wyrowski, F., Mattern, M., Menten, K. M., Lee, M.-Y., Brand, J., Wienen, M., Mazumdar, P., and others. (2021) OGHReS: Large-scale filaments in the outer Galaxy. Astronomy & Astrophysics, 655 . Article Number L2. ISSN 0004-6361. E-ISSN 1432-0746. (doi:10.1051/0004-6361/202142182) (KAR id:91444)


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) 12CO(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.

Item Type: Article
DOI/Identification number: 10.1051/0004-6361/202142182
Uncontrolled keywords: ISM: molecules – ISM: clouds – ISM: evolution – ISM: structure – Galaxy: local interstellar matter – Galaxies: ISM
Subjects: Q Science
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: James Urquhart
Date Deposited: 09 Nov 2021 14:22 UTC
Last Modified: 04 Jul 2023 12:41 UTC
Resource URI: (The current URI for this page, for reference purposes)

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