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Supernova Remnants in the Fossil Starburst in M82

Richard de Grijs·Robert W. O'Connell·George D. Becker·Roger A. Chevalier·John S. Gallagher III
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Abstract

We report the discovery of ten compact H-alpha-bright sources in the post-starburst region northeast of the center of M82, ``M82 B.'' These objects have H alpha luminosities and sizes consistent with Type II supernova remnants (SNRs). They fall on the same H alpha surface brightness-diameter (Sigma-D) relation defined by SNRs in other nearby star-forming galaxies, with the M82 candidates lying preferentially at the small diameter end. These are the first candidates for optically-visible SNRs in M82 outside the heavily obscured central starburst within ~250 pc from the galactic center. If these sources are SNRs, they set an upper limit to the end of the starburst in region ``B2,'' about 500 pc from the galaxy's core, of ~50 Myr. Region ``B1,'' about 1000 pc from the core, lacks good SNR candidates and is evidently somewhat older. This suggests star formation in the galaxy has propagated inward toward the present-day intense starburst core.

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Richard de Grijs, Robert W. O'Connell, George D. Becker, Roger A. Chevalier, John S. Gallagher III. 1999-10-27. Supernova Remnants in the Fossil Starburst in M82. https://doi.org/10.1086/301235

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