An optical and x-ray examination of two radio supernova remnant candidates in 30 Doradus

You Hua Chu, Robert A. Gruendl, C. H.Rosie Chen, Jasmina S. Lazendic, John R. Dickel

Research output: Contribution to journalArticleAcademicpeer-review

7 Citations (Scopus)

Abstract

The giant H II region 30 Doradus is known for its violent internal motions and bright diffuse X-ray emission, suggesting the existence of supernova remnants (SNRs), but no nonthermal radio emission has been detected. Recently, Lazendic et al. compared the Hα/Hβ and radio/Hα ratios and suggested two small radio sources to be nonthermal and thus SNR candidates; however, no optical or X-ray counterparts were detected. We have used high-resolution optical images and high-dispersion spectra to examine the morphological, spectral, and kinematic properties of these two SNR candidates and still find no optical evidence supporting their identification as SNRs. We have also determined the X-ray luminosities of these SNR candidates and find them 1-3 orders of magnitude lower than those commonly seen in young SNRs. High extinction can obscure optical and X-ray signatures of an SNR, but would prohibit the use of a high radio/Ha ratio to identify nonthermal radio emission. We suggest that the SNR candidate MCRX J053831.8-690620 is associated with a young star-forming region; while the radio emission originates from the obscured star-forming region, the observed optical emission is dominated by the foreground. We suggest that the SNR candidate MCRX J053838.8-690730 is associated with a dust/molecular cloud, which obscures some optical emission but not the radio emission.

Original languageEnglish
Pages (from-to)727-731
Number of pages5
JournalAstrophysical Journal
Volume615
Issue number2 I
DOIs
Publication statusPublished - 10 Nov 2004
Externally publishedYes

Keywords

  • Dust, extinction
  • ISM: individual (30 Doradus)
  • Magellanic Clouds
  • Supernova remnants

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