New evidence for Dicke's superradiance in the 6.7 GHz methanol spectral line in the interstellar medium

Repository of Nicolaus Copernicus University

Show simple item record

dc.contributor.author Rajabi, F.
dc.contributor.author Houde, M.
dc.contributor.author Bartkiewicz, Anna
dc.contributor.author Olech, Mateusz
dc.contributor.author Szymczak, Marian
dc.contributor.author Wolak, Paweł
dc.date.accessioned 2020-10-06T15:48:38Z
dc.date.available 2020-10-06T15:48:38Z
dc.date.issued 2019-01
dc.identifier.citation Monthly Notices of the Royal Astronomical Society vol. 484, 2019, pp. 15-90-1597.
dc.identifier.issn 0035-8711
dc.identifier.issn 1365-2966 (online)
dc.identifier.other 10.1093/mnras/stz074
dc.identifier.uri http://repozytorium.umk.pl/handle/item/6385
dc.description.abstract We present new evidence for superradiance (SR) in the methanol 6.7 GHz spectral line for three different star-forming regions: S255IR-NIRS3, G24.329+0.144, and Cepheus A. Our analysis shows that some of the flux–density flares exhibiting fast rise times and asymmetric light curves reported in these sources can naturally be explained within the context of SR. When a threshold for the inverted population column density is exceeded in a maser-hosting region, the radiation mode switches from one regulated by stimulated emission (maser) to SR. Superradiance, as a more efficient energy release mechanism, manifests itself through strong bursts of radiation emanating from spatially compact regions. Elevated inverted population densities and the initiation of SR can be due to a change in radiative pumping. Here, we show that an increase in the pump rate and the inverted population density of only a factor of a few results in a significant increase in radiation. While the changes in the pump rate can take place over a few hundred days, the rise in radiation flux density when SR is initiated is drastic and happens over a much shorter time-scale.
dc.description.sponsorship Narodowe Centrum Nauki
dc.language.iso eng
dc.publisher Royal Astronomical Society
dc.relation.ispartofseries Monthly Notices of the Royal Astronomical Society;484
dc.subject molecular processes
dc.subject radiation mechanisms: general
dc.subject ISM: molecules
dc.title New evidence for Dicke's superradiance in the 6.7 GHz methanol spectral line in the interstellar medium
dc.type info:eu-repo/semantics/article

Files in this item

This item appears in the following Collection(s)

Show simple item record

Search repository

Advanced Search


My Account