Interaction between cassiopeia a and nearby molecular clouds

C. D. Kilpatrick, John H Bieging, George H. Rieke

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We present spectroscopy of the supernova remnant Cassiopeia A (Cas A) observed at infrared wavelengths from 10 to 40 μm with the Spitzer Space Telescope and at millimeter wavelengths in 12CO and 13CO J =2-1 (230 and 220 GHz) with the Heinrich Hertz Submillimeter Telescope. The IR spectra demonstrate high-velocity features toward a molecular cloud coincident with a region of bright radio continuum emission along the northern shock front of Cas A. The millimeter observations indicate that CO emission is broadened by a factor of two in some clouds toward Cas A, particularly to the south and west. We believe that these features trace interactions between the Cas A shock front and nearby molecular clouds. In addition, some of the molecular clouds that exhibit broadening in CO lie 1′-2′ away from the furthest extent of the supernova remnant shock front. We propose that this material may be accelerated by ejecta with velocity significantly larger than the observed free-expansion velocity of the Cas A shock front. These observations may trace cloud interactions with fast-moving outflows such as the bipolar outflow along the southwest to northeast axis of the Cas A supernova remnant, as well as fast-moving knots seen emerging in other directions.

Original languageEnglish (US)
Article number144
JournalAstrophysical Journal
Volume796
Issue number2
DOIs
StatePublished - Dec 1 2014

Fingerprint

Cassiopeia A
molecular clouds
shock fronts
supernova remnants
outflow
interactions
wavelength
ejecta
Space Infrared Telescope Facility
wavelengths
spectroscopy
radio
emerging
telescopes
continuums
expansion

Keywords

  • Infrared: ISM
  • ISM: individual objects (Cassiopeia A)
  • ISM: molecules
  • ISM: supernova remnants
  • Shock waves

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Interaction between cassiopeia a and nearby molecular clouds. / Kilpatrick, C. D.; Bieging, John H; Rieke, George H.

In: Astrophysical Journal, Vol. 796, No. 2, 144, 01.12.2014.

Research output: Contribution to journalArticle

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AU - Bieging, John H

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KW - Shock waves

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