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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We report the discovery of an extensive system of scattered light echoarclets associated with the recent supernovae in the local neighbourhood of theMilky Way: Tycho (SN 1572) and Cassiopeia A. Existing work suggests that theTycho SN was a thermonuclear explosion while the Cas A supernova was a corecollapse explosion. Precise classifications according to modern nomenclaturerequire spectra of the outburst light. In the case of ancient SNe, this canonly be done with spectroscopy of their light echo, where the discovery of thelight echoes from the outburst light is the first step. Adjacent light echopositions suggest that Cas A and Tycho may share common scattering duststructures. If so, it is possible to measure precise distances betweenhistorical Galactic supernovae. On-going surveys that alert on the developmentof bright scattered-light echo features have the potential to reveal detailedspectroscopic information for many recent Galactic supernovae, both directlyvisible and obscured by dust in the Galactic plane.

Scattered-Light Echoes from the Historical Galactic Supernovae Cassiopeia A and Tycho (SN 1572)