2012A&A...542L..19G


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST17:24:00

2012A&A...542L..19G - Astronomy and Astrophysics, volume 542, L19-19 (2012/6-1)

Probing magnetohydrodynamic shocks with high-J CO observations: W28F.

GUSDORF A., ANDERL S., GUESTEN R., STUTZKI J., HUEBERS H.-W., HARTOGH P., HEYMINCK S. and OKADA Y.

Abstract (from CDS):

Observing supernova remnants (SNRs) and modelling the shocks they are associated with is the best way to quantify the energy SNRs re-distribute back into the interstellar medium (ISM). We present comparisons of shock models with CO observations in the F knot of the W28 supernova remnant. These comparisons constitute a valuable tool to constrain both the shock characteristics and pre-shock conditions. New CO observations from the shocked regions with the APEX and SOFIA telescopes are presented and combined. The integrated intensities are compared to the outputs of a grid of models, which were combined from an MHD shock code that calculates the dynamical and chemical structure of these regions and a radiative transfer module based on the large velocity gradient (LVG) approximation. We base our modelling method on the higher J CO transitions, which unambiguously trace the passage of a shock wave. We provide fits for the blue- and red-lobe components of the observed shocks. We find that only stationary, C-type shock models can reproduce the observed levels of CO emission. Our best models are found for a pre-shock density of 104cm–3, with the magnetic field strength varying between 45 and 100µG, and a slightly higher shock velocity for the so-called blue-shock (∼25km/s) than for the red one (∼20km/s). Our models also satisfactorily account for the pure rotational H2 emission that is observed with Spitzer.

Abstract Copyright:

Journal keyword(s): ISM: supernova remnants - ISM: individual objects: W28 - ISM: kinematics and dynamics - shock waves - submillimeter: ISM - infrared: ISM

Simbad objects: 5

goto Full paper

goto View the reference in ADS

Number of rows : 5

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 RAFGL 1922 C* 17 07 58.10976 -24 44 31.1820           C-rich 59 0
2 NAME NGC 6334-I Cl* 17 20 53.35 -35 47 01.5           ~ 269 0
3 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 514 1
4 SNR G006.4-00.1 SNR 18 01 22.7 -23 17 20           ~ 653 1
5 [WC89] 010.47+0.03B1 HII 18 08 38.25 -19 51 50.1           ~ 8 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2012A&A...542L..19G and select 'bookmark this link' or equivalent in the popup menu


2020.07.08-17:24:00

© Université de Strasbourg/CNRS

    • Contact