English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Using the Hubble Space Telescope ACS imaging of the GOODS North and Southfields during Cycles 11, 12, and 13, we derive empirical constraints on thedelay-time distribution function for type Ia supernovae. We extend our previousanalysis to the three-year sample of 56 SNe Ia over the range 0.2<z<1.8, usinga Markov chain Monte Carlo to determine the best-fit unimodal delay-timedistribution function. The test, which ultimately compares the star formationrate density history to the unbinned volumetric SN Ia rate history from theGOODS/HST-SN survey, reveals a SN Ia delay-time distribution that is tightlyconfined to 3-4 Gyrs (to >95% confidence). This result is difficult to resolvewith any intrinsic delay-time distribution function (bimodal or otherwise), inwhich a substantial fraction (e.g., >10%) of events are ``prompt'', requiringless than approximately 1 Gyr to develop from formation to explosion. Theresult is, however, strongly motivated by the decline in the number of SNe Iaat z>1.2. Sub-samples of the HST-SN data confined to lower redshifts (z<1) showplausible delay-time distributions that are dominated by prompt events, whichis more consistent with results from low-redshift supernova samples andsupernova host galaxy properties. Scenarios in which a substantial fraction ofz>1.2 supernovae are extraordinarily obscured by dust may partly explain thedifferences in low-z and high-z results. Other possible resolutions may includeenvironmental dependencies (such as gas-phase metallicity) that affect theprogenitor mechanism efficiency, especially in the early universe.

Empirical Delay Time Distributions of Type Ia Supernovae From The Extended GOODS/HST Supernova Survey