A Spectroscopic Study of the Rich Supernova Remnant Population in M83

被引:21
作者
Winkler, P. Frank [1 ]
Blair, William P. [2 ]
Long, Knox S. [3 ,4 ]
机构
[1] Middlebury Coll, Dept Phys, Middlebury, VT 05753 USA
[2] Johns Hopkins Univ, Henry A Rowland Dept Phys & Astron, 3400 N Charles St, Baltimore, MD 21218 USA
[3] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA
[4] Eureka Sci Inc, 2452 Delmer St,Suite 100, Oakland, CA 94602 USA
基金
澳大利亚研究理事会; 美国国家科学基金会; 英国科学技术设施理事会;
关键词
galaxies:individual (M83); galaxies:ISM; ISM:supernova remnants Supporting material:machine readable tables; HUBBLE-SPACE-TELESCOPE; SMALL-MAGELLANIC-CLOUD; H-II REGIONS; IRREGULAR GALAXY NGC-4449; CASSIOPEIA-A SUPERNOVA; HII-REGIONS; OPTICAL SPECTROSCOPY; INTERSTELLAR-MEDIUM; SPIRAL GALAXIES; RADIO-CONTINUUM;
D O I
10.3847/1538-4357/aa683d
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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] lambda lambda 6716, 6731 to Ha 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] lambda 5007 to H alpha emission ratio, selected in an attempt to identify young ejecta-dominated SNRs like Cas A, reveal only one (previously reported) object with the broad (greater than or similar to 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 (similar to 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.
引用
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页数:20
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