NOAO >   Observing Info >   Approved Programs >   2008A-0427

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Proposal Information for 2008A-0427


PI: Jennifer J. Birriel, Morehead State University, j.birriel@moreheadstate.edu
Address: Physical Sciences, 123 Lappin Hall, Morehead, KY 40351, USA

CoI: Thomas G. Pannuti, Morehead State University

Title: Spectroscopic Observations of Selected Optically-Identified Supernova Remnants (SNRs) in the Nearby Face-On Spiral Galaxy M101

Abstract: We propose to conduct spectroscopic observations of a sample of selected optically-identified supernova remnants (SNRs) located in the nearby face-on spiral galaxy M101. Our sample of selected SNRs includes seven which are known to possess an X-ray counterpart as detected by \it Chandra and 13 which lack such a counterpart. A clear understanding of why certain SNRs possess X-ray counterparts and others do not remains lacking: one hypothesis suggests that SNRs located in regions of enhanced ISM density are more likely to possess X-ray counterparts. Our proposed long-slit, spectroscopic observations will allow us to measure such crucial line ratios in the spectra of these SNRs as well as complementary H II regions. Based on our measured values for these line ratios, we will test the hypothesis that ambient density plays a dominant role in determining the spectral bands (X-ray, optical and radio) at which an SNR produces a considerable amount of emission.


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