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

Unusual stellar explosions represent an opportunity to learn about bothstellar and galaxy evolution. Mapping the atomic gas in host galaxies of suchtransients can lead to an understanding of the conditions triggering them. Weprovide resolved atomic gas observations of the host galaxy, CGCG137-068, ofthe unusual, poorly-understood transient AT2018cow searching for clues tounderstand its nature. We test whether it is consistent with a recent inflow ofatomic gas from the intergalactic medium, as suggested for host galaxies ofgamma-ray bursts (GRBs) and some supernovae (SNe). We observed the HI hyperfinestructure line of the AT2018cow host with the Giant Metrewave Radio Telescope.There is no unusual atomic gas concentration near the position of AT2018cow.The gas distribution is much more regular than those of GRB/SN hosts. TheAT2018cow host has an atomic gas mass lower by 0.24 dex than predicted from itsstar formation rate (SFR) and is at the lower edge of the galaxy main sequence.In the continuum we detected the emission of AT2018cow and of a star-formingregion in the north-eastern part of the bar (away from AT2018cow). This regionhosts a third of the galaxy's SFR. The absence of atomic gas concentrationclose to AT2018cow, along with a normal SFR and regular HI velocity field, setsCGCG137-068 apart from GRB/SN hosts studied in HI. The environment of AT2018cowtherefore suggests that its progenitor may not have been a massive star. Ourfindings are consistent with an origin of the transient that does not require aconnection between its progenitor and gas concentration or inflow: an explodinglow-mass star, a tidal disruption event, a merger of white dwarfs, or a mergerbetween a neutron star and a giant star. We interpret the recently reportedatomic gas ring in CGCG137-068 as a result of internal processes connected withgravitational resonances caused by the bar.

On the nature of the unusual transient AT 2018cow from HI observations of its host galaxy