Type IIn Supernova Detections in z˜2 Lyman Break Galaxies: Probing the IMF Directly

Details Type IIn Supernova Detections in z˜2 Lyman Break Galaxies: Probing the IMF Directly Type IIn Supernova Detections in z˜2 Lyman Break Galaxies: Probing the IMF Directly

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aspc..440..337c&link_type=abstract

UP2010: Have Observations Revealed a Variable Upper End of the Initial Mass Function? ASP Conference Proceedings, Vol. 440. Pro

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Type IIn supernovae (SNe IIn) exhibit luminous ultraviolet continua during outburst and luminous, long-lived narrow ultraviolet and optical emission lines attributed to circumstellar interaction. These properties have enabled successful detections at z˜2 in archival imaging and continued investigations from late-time spectroscopy. Because SNe IIn are believed to have massive (≳50M&sun;) progenitors, searches in the well-studied Lyman break galaxy (LBG) host population offer the prospect of testing the form of the high-redshift stellar initial mass function (IMF) in a high density star formation environment directly. I briefly discuss our z˜2 photometric detection method targeting LBGs in the Canada-France-Hawaii Telescope Legacy Survey (CFHTLS) and present data from the first 6 confirmed z˜2 SNe IIn pulled from 30 photometric SN candidates. A comparison of the color and magnitude distributions of the SN host galaxies to that of the full LBG sample finds that z˜2 SNe preferentially occur in bluer, fainter galaxies. I conclude with a discussion of an approach that uses the CFHTLS pilot sample to provide a first estimate of the form of the high-redshift IMF. Upcoming deep synoptic imaging surveys will greatly improve z˜2 SNe IIn statistics from ˜105 expected detections and future large aperture space- and ground-based telescopes will have the sensitivities to extend this work to ≳6.

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