What Produced the Ultraluminous Supernova Remnant in NGC 6946?

Details What Produced the Ultraluminous Supernova Remnant in NGC 6946? What Produced the Ultraluminous Supernova Remnant in NGC 6946?

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.8505d&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #85.05; Bulletin of the American Astronomical Society, Vol. 31, p.973

Astronomy and Astrophysics

Astronomy

2

Scientific paper

The ultra-luminous supernova remnant (SNR) in NGC 6946 is the brightest X-ray SNR known, ~ 1000 times as luminous as Cas A. However, high-velocity gas with Vexp > 600 km/s has not been detected, as expected for a young remnant. HST WFPC2 images of this SNR show multiple loops. This morphology has been used as evidence of colliding SNRs of different ages, in order to explain the X-ray luminosity (Blair, Fesen, & Schlegel 1997), We have obtained high-dispersion echelle spectra of this SNR with the KPNO 4-m telescope. The SNR is detected in Hα , [N II]lambda 6584, and [O III]lambda 5007 lines. The emission lines show a narrow component (FWHM ~ 40 km/s) superposed on a broad component (FWZI ~ 360 km/s). The total [N II] flux is comparable to the Hα flux. The broad component contains ~ 1.5 times as much flux as the narrow component, and the broad component has slightly higher [N II]/Hα ratio than the narrow component. These spectral properties are qualitatively similar to some small SNRs in M33. The strong [N II] line in the narrow component suggests an anomalous nitrogen abundance usually associated with circumstellar material. The nitrogen abundance and small remnant size imply that the supernova progenitor was a WN star and the supernova exploded in a dense circumstellar bubble.

Affiliated with

Also associated with

No associations

Rating

What Produced the Ultraluminous Supernova Remnant in NGC 6946? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with What Produced the Ultraluminous Supernova Remnant in NGC 6946?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and What Produced the Ultraluminous Supernova Remnant in NGC 6946? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1122016