학술논문
Multi-Epoch Radio Imaging of gamma-ray Nova V959 Mon
Document Type
Working Paper
Author
Source
Monthly Notices of the Royal Astronomical Society, Volume 469, Issue 4, 21 August 2017, Pages 3976 to 3983
Subject
Language
Abstract
V959 Mon (Nova Mon 2012) was first detected by the Fermi Large Area Telescope in June 2012, as a transient gamma-ray source. Subsequent optical observations showed that this gamma-ray emission was due to a classical nova explosion. Multi-frequency observations of V959 Mon with the VLA between June and September 2012 revealed dramatic brightening, and a spectrum that steepened with increasing frequency. High resolution radio images of V959 Mon using e-MERLIN are presented here, at six epochs between September 2012 and February 2014 which show morphological evolution of the source. While early e-MERLIN observations of V959 Mon show an east-west elonga- tion in the ejecta morphology, subsequent observations suggest that the ejecta become elongated in the north-south direction. Our high-resolution observations of this sur- prising evolution in the structure of V959 Mon can assist us in further understanding the behaviour and morphology of nova ejecta.