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Radio observations of supernova remnant G1.9+0.3.
- Source :
-
Monthly Notices of the Royal Astronomical Society . 2/21/2020, Vol. 492 Issue 2, p2606-2621. 16p. - Publication Year :
- 2020
-
Abstract
- We present 1–10 GHz radio continuum flux density, spectral index, polarization, and rotation measure (RM) images of the youngest known Galactic supernova remnant (SNR) G1.9+0.3, using observations from the Australia Telescope Compact Array. We have conducted an expansion study spanning eight epochs between 1984 and 2017, yielding results consistent with previous expansion studies of G1.9+0.3. We find a mean radio continuum expansion rate of (0.78 ± 0.09) per cent yr−1 (or ∼8900 km s−1 at an assumed distance of 8.5 kpc), although the expansion rate varies across the SNR perimetre. In the case of the most recent epoch between 2016 and 2017, we observe faster-than-expected expansion of the northern region. We find a global spectral index for G1.9+0.3 of −0.81 ± 0.02 (76 MHz–10 GHz). Towards the northern region, however, the radio spectrum is observed to steepen significantly (∼−1). Towards the two so-called (east and west) 'ears' of G1.9+0.3, we find very different RM values of 400–600 and 100–200 rad m2, respectively. The fractional polarization of the radio continuum emission reaches (19 ± 2) per cent, consistent with other, slightly older, SNRs such as Cas A. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SUPERNOVA remnants
*HOLOCENE Epoch
*RADIOS
*ACTINIC flux
Subjects
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 492
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 141515174
- Full Text :
- https://doi.org/10.1093/mnras/stz3439