Further ASKAP detections of classical nova V6598 Sgr 2023
ATel #16969; K. Rose (U. Sydney, CSIRO), Dougal Dobie (U. Sydney, OzGrav), Tara Murphy (U. Sydney), and Laura Driessen (U. Sydney) on behalf of the VAST collaboration
on 9 Jan 2025; 06:01 UT
Credential Certification: Kovi Rose (kovirose@gmail.com)
Following our previous detections (ATel #16383), we report new measurements of the radio emission from V6598 Sgr 2023 with the CSIRO's Australian SKA Pathfinder (ASKAP) as part of the Variables And Slow Transients (VAST) survey (Murphy et al. 2021) and Rapid ASKAP Continuum Survey (RACS; McConnell 2020).
We measure flux densities of:
| 2023 Dec 11.19 |
5.2 +/- 0.3 mJy/beam |
888 MHz |
| 2023 Dec 30.09 |
3.6 +/- 0.3 mJy/beam |
888 MHz |
| 2024 Jan 13.16 |
2.4 +/- 0.2 mJy/beam |
888 MHz |
| 2024 Jan 15.13 |
2.5 +/- 0.2 mJy/beam |
944 MHz |
| 2024 Jan 26.10 |
2.8 +/- 0.4 mJy/beam |
944 MHz |
| 2024 Feb 02.04 |
2.3 +/- 0.3 mJy/beam |
888 MHz |
| 2024 Feb 22.04 |
2.0 +/- 0.3 mJy/beam |
888 MHz |
VAST observations were conducted at a central frequency of 888 MHz with a typical integration time of 12 minutes. RACS observations were conducted at a central frequency of 944 MHz with a typical integration time of 15 minutes. All observations have a bandwidth of 288 MHz. The quoted uncertainties do not include the systematic flux scale uncertainty of approximately 10%.
We have not made any detections since 2024 Feb 22.04 with a mean 5-sigma upper limit of 1.5 mJy. Our latest non-detection was on 2024 Oct 16.40. Based on our previous detections (ATel #
16383) the outburst of low-frequency radio emission appears to have lasted approximately 130 days.
This field will continue to be monitored as part of regular VAST observations.
This scientific work uses data obtained from Inyarrimanha Ilgari Bundara, the CSIRO Murchison Radio-astronomy Observatory. We acknowledge the Wajarri Yamaji People as the Traditional Owners and native title holders of the Observatory site. CSIRO's ASKAP radio telescope is part of the Australia Telescope National Facility (https://ror.org/05qajvd42). Operation of ASKAP is funded by the Australian Government with support from the National Collaborative Research Infrastructure Strategy. ASKAP uses the resources of the Pawsey Supercomputing Research Centre. Establishment of ASKAP, Inyarrimanha Ilgari Bundara, the CSIRO Murchison Radio-astronomy Observatory and the Pawsey Supercomputing Research Centre are initiatives of the Australian Government, with support from the Government of Western Australia and the Science and Industry Endowment Fund.
