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Observations and discoveries of supernova remnants with GMRT

Published online by Cambridge University Press:  29 January 2014

Subhashis Roy  and
Sabyasachi Pal
Subhashis Roy
Affiliation:
NCRA-TIFR, Pune University Campus, Pune-411007, India email: roy@ncra.tifr.res.in
Sabyasachi Pal
Affiliation:
Indian Centre for Space Physics, Kolkata-700084, India Ionospheric and Earthquake Research Centre, Kolkata-7211154, India email: sabya@csp.res.in
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Abstract

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We have measured HI absorption distance to the youngest Galactic supernova remnant G1.9+0.3. Absorption by known anomalous velocity features near the Galactic centre (GC) puts a lower limit on its distance from Sun as 10 kpc, 2 kpc further away from the GC. We have found a small diameter (1.6′) shell like structure G354.4+0.0, that shows polarised emission in the NVSS. Based on its morphology, angular size, HI distance and its spectrum between 1.4 GHz and 330 MHz, it is perhaps the second youngest SNR in the Galaxy that is expanding in a dense environment of an HII region surrounding it. Our pilot observation of the inner Galactic 4th quadrant within 337° < l < 354° with a fixed Galactic latitude of 0.37° has confirmed G345.1−0.2 as an SNR.

Keywords

supernova remnantsradio continuum: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S296: Supernova Environmental Impacts , January 2013 , pp. 197 - 201
Copyright
Copyright © International Astronomical Union 2014 

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