2017ApJ...839...83W -
Astrophys. J., 839, 83-83 (2017/April-3)
A spectroscopic study of the rich supernova remnant population in M83.
WINKLER P.F., BLAIR W.P. and LONG K.S.
Abstract (from CDS):
We report the results from a spectrophotometric study sampling the 300 candidate supernova remnants (SNRs) in M83 identified through optical imaging with Magellan/IMACS and Hubble Space Telescope/WFC3. Of the 118 candidates identified based on a high [S II] λλ 6716, 6731 to Hα emission ratio, 117 show spectroscopic signatures of shock-heated gas, confirming them as SNRs-the largest uniform set of SNR spectra for any galaxy. Spectra of 22 objects with a high [O III] λ5007 to Hα emission ratio, selected in an attempt to identify young ejecta-dominated SNRs like Cas A, reveal only one (previously reported) object with the broad ( 1000 km s–1) emission lines characteristic of ejecta-dominated SNRs, beyond the known SN1957D remnant. The other 20 [O III]-selected candidates include planetary nebulae, compact H II regions, and one background QSO. Although our spectroscopic sample includes 22 SNRs smaller than 11 pc, none of the other objects show broad emission lines; instead their spectra stem from relatively slow (∼200 km s–1) radiative shocks propagating into the metal-rich interstellar medium of M83. With six SNe in the past century, one might expect more of M83's small-diameter SNRs to show evidence of ejecta; this appears not to be the case. We attribute their absence to several factors, including that SNRs expanding into a dense medium evolve quickly to the ISM-dominated phase, and that SNRs expanding into regions already evacuated by earlier SNe are probably very faint.
Abstract Copyright:
© 2017. The American Astronomical Society. All rights reserved.
Journal keyword(s):
galaxies: individual: M83 - galaxies: ISM - ISM: supernova remnants - ISM: supernova remnants
VizieR on-line data:
<Available at CDS (J/ApJ/839/83): table2.dat table3.dat table4.dat table5.dat table6.dat table7.dat>
Nomenclature:
Tables 6-7: [WBL2017] HII-NN (Nos 1-18).
Simbad objects:
180
Full paper
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