Universität zu Köln

Tiwari, M., Karim, R., Pound, M. W., Wolfire, M., Jacob, A., Buchbender, C., Guesten, R., Guevara, C., Higgins, R. D., Kabanovic, S., Pabst, C., Ricken, O., Schneider, N., Simon, R., Stutzki, J. and Tielens, A. G. G. M. (2021). SOFIA FEEDBACK Survey: Exploring the Dynamics of the Stellar Wind-Driven Shell of RCW 49. Astrophys. J., 914 (2). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

We unveil the stellar wind-driven shell of the luminous massive star-forming region of RCW 49 using SOFIA FEEDBACK observations of the [C ii] 158 mu m line. The complementary data set of the (CO)-C-12 and (CO)-C-13 J = 3 -> 2 transitions is observed by the APEX telescope and probes the dense gas toward RCW 49. Using the spatial and spectral resolution provided by the SOFIA and APEX telescopes, we disentangle the shell from a complex set of individual components of gas centered around RCW 49. We find that the shell of radius similar to 6 pc is expanding at a velocity of 13 km s(-1) toward the observer. Comparing our observed data with the ancillary data at X-ray, infrared, submillimeter, and radio wavelengths, we investigate the morphology of the region. The shell has a well-defined eastern arc, while the western side is blown open and venting plasma further into the west. Though the stellar cluster, which is similar to 2 Myr old, gave rise to the shell, it only gained momentum relatively recently, as we calculate the shell's expansion lifetime of similar to 0.27 Myr, making the Wolf-Rayet star WR 20a a likely candidate responsible for the shell's reacceleration.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Tiwari, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Karim, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pound, M. W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wolfire, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jacob, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Buchbender, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Guesten, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Guevara, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Higgins, R. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kabanovic, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Pabst, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ricken, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schneider, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Simon, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Stutzki, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tielens, A. G. G. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-590382
DOI:	10.3847/1538-4357/abf6ce
Journal or Publication Title:	Astrophys. J.
Volume:	914
Number:	2
Date:	2021
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RESOLUTION MULTIBAND SURVEY; CLUSTER WESTERLUND 2; EARLY-TYPE STARS; H II REGIONS; INTERSTELLAR-MEDIUM; OB ASSOCIATIONS; C-II; EMISSION; GLIMPSE; I. Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59038