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• W2802540789 abstract "We use the supernova remnants (SNRs) in the two Magellanic Clouds (MCs) as a supernova (SN) survey, conducted over tens of kyr, from which we derive the current SN rate, and the SN delay time distribution (DTD), i.e., the SN rate vs. time that would follow a hypothetical brief burst of a star formation. In a companion paper (Badenes, Maoz, & Draine 2010) we have compiled a list of 77 SNRs in the MCS, and argued that it is a largely complete record of the SNRs that are now in the Sedov phase of their expansions. We recover the SN DTD by comparing, on the one hand, the numbers of SNRs observed in small individual cells in these galaxies to, on the other hand, the star-formation histories of each cell, as calculated from resolved stellar populations by Harris & Zaritsky. We identify the visibility times of SNRs with the Sedov-phase lifetimes, which depend on the local ambient densities. The local densities are estimated from HI emission, from an inverse Schmidt law based on either Halpha flux or on the star-formation rate from the resolved stellar populations, and from combinations of these tracers. This is the first SN DTD based on resolved stellar populations. In the DTD, we detect type-Ia SNe (that explode within 330 Myr of star formation) at >99% confidence level (c.l.). The best fit for the number of prompt SNe-Ia per stellar mass formed is (2.7-11.0) x 10^{-3} /Msun, depending on the density tracer used. The 95% c.l. range for a delayed SN Ia component (from 330 Myr to a Hubble time) is < 1.6 x 10^{-13} SN/yr/Msun, consistent with rate measurements in old populations. The current total (core-collapse+Ia) SN rate in the MCs is 2.5-4.6 SNe per millenium (68% c.l.+systematics), or 1.7-3.1 SNuM [SNe/100 yr/10^{10}Msun], in agreement with the historical record and with rates measured in other dwarf irregulars. Conversely, assuming the SNRs are in free expansion, rather than in their Sedov phase, would impose on the SNRs a maximum age of 6 kyr, and would imply a MC SN rate per unit mass that is 5 times higher than in any type of galaxy, and a low-mass limit for core-collapse progenitors in conflict with stellar evolution theory." @default.
• W2802540789 created "2018-05-17" @default.
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• W2802540789 date "2010-03-15" @default.
• W2802540789 modified "2023-09-27" @default.
• W2802540789 title "The supernova rate and delay times in the Magellanic Clouds" @default.
• W2802540789 hasPublicationYear "2010" @default.
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