Universität zu Köln

Soler, J. D., Beuther, H., Syed, J., Wang, Y., Anderson, L. D., Glover, S. C. O., Hennebelle, P., Heyer, M., Henning, Th., Izquierdo, A. F., Klessen, R. S., Linz, H., McClure-Griffiths, N. M., Ott, J., Ragan, S. E., Rugel, M., Schneider, N., Smith, R. J., Sormani, M. C., Stil, J. M., Tress, R. and Urquhart, J. S. (2020). The history of dynamics and stellar feedback revealed by the HI filamentary structure in the disk of the Milky Way. Astron. Astrophys., 642. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

We present a study of the filamentary structure in the emission from the neutral atomic hydrogen (HI) at 21 cm across velocity channels in the 40 '' and 1.5-km s(-1) resolution position-position-velocity cube, resulting from the combination of the single-dish and interferometric observations in The HI/OH/recombination-line survey of the inner Milky Way. Using the Hessian matrix method in combination with tools from circular statistics, we find that the majority of the filamentary structures in the HI emission are aligned with the Galactic plane. Part of this trend can be assigned to long filamentary structures that are coherent across several velocity channels. However, we also find ranges of Galactic longitude and radial velocity where the HI filamentary structures are preferentially oriented perpendicular to the Galactic plane. These are located (i) around the tangent point of the Scutum spiral arm and the terminal velocities of the Molecular Ring, around l approximate to 28 degrees and v(LSR) approximate to 100 km s(-1), (ii) toward l approximate to 45 degrees and v(LSR) approximate to 50 km s(-1), (iii) around the Riegel-Crutcher cloud, and (iv) toward the positive and negative terminal velocities. A comparison with numerical simulations indicates that the prevalence of horizontal filamentary structures is most likely the result of large-scale Galactic dynamics and that vertical structures identified in (i) and (ii) may arise from the combined effect of supernova (SN) feedback and strong magnetic fields. The vertical filamentary structures in (iv) can be related to the presence of clouds from extra-planar HI gas falling back into the Galactic plane after being expelled by SNe. Our results indicate that a systematic characterization of the emission morphology toward the Galactic plane provides an unexplored link between the observations and the dynamical behavior of the interstellar medium, from the effect of large-scale Galactic dynamics to the Galactic fountains driven by SNe.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Soler, J. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Beuther, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Syed, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wang, Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Anderson, L. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Glover, S. C. O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hennebelle, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Heyer, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Henning, Th. UNSPECIFIED UNSPECIFIED UNSPECIFIED Izquierdo, A. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Klessen, R. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Linz, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED McClure-Griffiths, N. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ott, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ragan, S. E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rugel, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schneider, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Smith, R. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sormani, M. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Stil, J. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tress, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Urquhart, J. S. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-314492
DOI:	10.1051/0004-6361/202038882
Journal or Publication Title:	Astron. Astrophys.
Volume:	642
Date:	2020
Publisher:	EDP SCIENCES S A
Place of Publication:	LES ULIS CEDEX A
ISSN:	1432-0746
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ABSORPTION-LINE SURVEY; MOLECULAR CLOUDS; GALACTIC DISTRIBUTION; MASSIVE CLUSTER; SELF-ABSORPTION; MAGNETIC-FIELD; RED SUPERGIANTS; MASER EMISSION; STAR-FORMATION; I SHELLS Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/31449