Universität zu Köln

Pineda, Jorge L., Stutzki, Juergen, Buchbender, Christof ORCID: 0000-0002-2064-7691, Koda, Jin, Fischer, Christian, Goldsmith, Paul F., Glover, Simon C. O., Klessen, Ralf S., Kramer, Carsten, Mookerjea, Bhaswati ORCID: 0000-0003-1766-6303, Smith, Rowan ORCID: 0000-0002-0820-1814, Tress, Robin and Ziebart, Monika (2020). A SOFIA Survey of [Cii] in the Galaxy M51. II. [Cii] and CO Kinematics across the Spiral Arms. Astrophys. J., 900 (2). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

We present the first complete, velocity-resolved [Cii] 158 mu m image of the M51 grand-design spiral galaxy, observed with the upgraded German Receiver for Astronomy at Terahertz frequencies instrument on the Stratospheric Observatory for Infrared Astronomy. [Cii] is an important tracer of various phases of the interstellar medium (ISM), including ionized gas, neutral atomic, and diffuse molecular regions. We combine the [Cii] data with Hi, CO, 24 mu m dust continuum, FUV, and NIRK-band observations to study the evolution of the ISM across M51's spiral arms in both position-position and position-velocity space. Our data show strong velocity gradients in Hi,(CO)-C-12, and [Cii] at the locations of the stellar arms (traced byK-band data) with a clear offset in position-velocity space between upstream molecular gas (traced by(12)CO) and downstream star formation (traced by [Cii]). We compare the observed position-velocity maps across the spiral arms with synthetic observations from numerical simulations of galaxies with both dynamical and quasi-stationary steady spiral arms that predict both tangential and radial velocities at the location of the spiral arms. We find that our observations, based on the observed velocity gradients and associated offset between CO and [Cii], are consistent with the presence of shocks in the spiral arms in the inner parts of M51 and in the arm connecting the companion galaxy, M51b, in the outer parts of M51.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Pineda, Jorge L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Stutzki, Juergen UNSPECIFIED UNSPECIFIED UNSPECIFIED Buchbender, Christof UNSPECIFIED orcid.org/0000-0002-2064-7691 UNSPECIFIED Koda, Jin UNSPECIFIED UNSPECIFIED UNSPECIFIED Fischer, Christian UNSPECIFIED UNSPECIFIED UNSPECIFIED Goldsmith, Paul F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Glover, Simon C. O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Klessen, Ralf S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kramer, Carsten UNSPECIFIED UNSPECIFIED UNSPECIFIED Mookerjea, Bhaswati UNSPECIFIED orcid.org/0000-0003-1766-6303 UNSPECIFIED Smith, Rowan UNSPECIFIED orcid.org/0000-0002-0820-1814 UNSPECIFIED Tress, Robin UNSPECIFIED UNSPECIFIED UNSPECIFIED Ziebart, Monika UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-321211
DOI:	10.3847/1538-4357/abab0a
Journal or Publication Title:	Astrophys. J.
Volume:	900
Number:	2
Date:	2020
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language STAR-FORMATION; MOLECULAR CLOUDS; DARK GAS; HI; SIMULATIONS; SINGS Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/32121