Physics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6124f&link_type=abstract
HST Proposal ID #6124
Physics
Hst Proposal Id #6124 Interstellar Medium
Scientific paper
We propose to detect 100 -- 1000 yr old Type Ia supernova remnants in the central region of NGC 5253 by means of obscuration spots due to Fe-rich ejecta resonance line absorptions. Absorption line studies of young supernova remnants represent new and potentially powerful tools for exploring the properties of the freely expanding, iron-rich ejecta expected in SN Ia remnants. , We request WFPC2+F255W images of the amorphous starburst galaxy NGC 5253. Two of the brightest historic Type Ia supernovae occurred here, SN 1895B (= Z Cen) and SN 1972E. By imaging NGC 5253 in the rich ultraviolet Fe I + Fe II resonance line region (2300--3000 Angstrom), 100 -- 1000 yr old SN Ia remnants with V_ exp = 5 - 10 * 10^3 km/s located in NGC 5253's facing nuclear region will be detected as 0.05'' - 0.50'' x (D/4 Mpc) diameter dark `spots'. SN 1895B which exploded just 25'' from the center, is a prime candidate for such iron absorption detection. Older and subsequently larger SN Ia remnants which lie in the galaxy's nuclear region will be detected as well. These detections can place strong constraints on the mass and expansion velocity of iron ejecta in Type Ia SNe and this galaxy's SN Ia rate.
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