2013A&A...558L...2W


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST02:50:22

2013A&A...558L...2W - Astronomy and Astrophysics, volume 558, L2-2 (2013/10-1)

CO rotational line emission from a dense knot in Cassiopeia A. Evidence for active post-reverse-shock chemistry.

WALLSTROEM S.H.J., BISCARO C., SALGADO F., BLACK J.H., CHERCHNEFF I., MULLER S., BERNE O., RHO J. and TIELENS A.G.G.M.

Abstract (from CDS):

We report a Herschel detection of high-J rotational CO lines from a dense knot in the supernova remnant Cas A. Based on a combined analysis of these rotational lines and previously observed ro-vibrational CO lines, we find the gas to be warm (two components at ∼400 and 2000K) and dense (106–7cm–3), with a CO column density of ∼5x1017cm–2. This, along with the broad line widths (∼400km/s), suggests that the CO emission originates in the post-shock region of the reverse shock. As the passage of the reverse shock dissociates any existing molecules, the CO has most likely reformed in the past several years in the post-shock gas. The CO cooling time is similar to the CO formation time, therefore we discuss possible heating sources (UV photons from the shock front, X-rays, electron conduction) that may maintain the high column density of warm CO.

Abstract Copyright:

Journal keyword(s): ISM: supernova remnants - submillimeter: ISM - ISM: individual objects: Cassiopeia A

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4485 2
2 NAME Cas A SNR 23 23 24.000 +58 48 54.00           ~ 2414 1

    Equat.    Gal    SGal    Ecl

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2020.07.10-02:50:22

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