OGHReS: Large-scale filaments in the outer Galaxy

被引:13
|
作者
Colombo, D. [1 ]
Koenig, C. [1 ]
Urquhart, J. S. [2 ]
Wyrowski, F. [1 ]
Mattern, M. [3 ]
Menten, K. M. [1 ]
Lee, M-Y [4 ]
Brand, J. [5 ,6 ]
Wienen, M. [1 ]
Mazumdar, P. [1 ]
Schuller, F. [1 ,7 ]
Leurini, S. [8 ]
机构
[1] Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany
[2] Univ Kent, Ctr Astrophys & Planetary Sci, Canterbury CT2 7NH, Kent, England
[3] Commissariat Energie Atom & Energies Alternat, F-91191 Gif Sur Yvette, France
[4] Korea Astron & Space Sci Inst, 776 Daedeok Daero, Daejeon 34055, South Korea
[5] INAF Ist Radioastron, Via P Gobetti 101, I-40129 Bologna, Italy
[6] Italian ALMA Reg Ctr, Via P Gobetti 101, I-40129 Bologna, Italy
[7] Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany
[8] INAF Osservatorio Astron Cagliari, Via Sci 5, I-09047 Selargius, CA, Italy
关键词
ISM: molecules; ISM: clouds; evolution; ISM: structure; local insterstellar matter; galaxies: ISM; GIANT MOLECULAR FILAMENTS; CLUSTER-FORMATION; CLOUDS; SEDIGISM; NEBULA; FRAGMENTATION; ABUNDANCE; CATALOG; II;
D O I
10.1051/0004-6361/202142182
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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) (CO)-C-12(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.
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页数:14
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