A global group of astronomers experiences the detection of a brand new tidal disruption occasion (TDE) as a part of All-Sky Automated Survey for SuperNovae (ASAS-SN). The newfound TDE, designated ASASSN-23bd, seems to be the least luminous and the bottom redshift TDE identified to date. The discovering is reported in a paper published January 10 on the pre-print server arXiv.
TDEs happen when a star passes shut sufficient to a supermassive black hole and is pulled aside by the black hole’s tidal forces, inflicting the method of disruption. Such tidally disrupted stellar particles begins raining down on the black hole and radiation emerges from the innermost area of accreting particles, which is an indicator of the presence of a TDE.
Observations carried out by a bunch of astronomers led by Willem Hoogendam of the College of Hawaii have discovered a brand new TDE in NGC 3799—an lively barred spiral galaxy positioned some 300 million light years away. ASASSN-23bd (AT 2023clx) was detected in February 2023 at a redshift of 0.011.
“ASAS-SN found ASASSN-23bd (a.ok.a. AT 2023clx2) on MJD 59997.2 at (????, ????) = (11:40:09.397 +15:19:38.54) in NGC 3799 utilizing the Cassius unit in Chile,” the researchers wrote within the paper.
ASASSN-23bd peaked on February 25, 2023, with a peak ultraviolet/optical luminosity of about 5.4 tredecillion erg/s, and a close to peak X-ray higher restrict of 17.5 duodecillion erg/s. The TDE displayed hydrogen-alpha emission all through its decline and helium emission close to peak and shortly after the height.
The observations point out that the black hole of ASASSN-23bd has a mass of about a million solar lots. The TDE’s host, NGC 3799, seems to be nonetheless present process star formation and hosts weak lively galactic nucleus (AGN) exercise.
Primarily based on the outcomes, the astronomers concluded that ASASSN-23bd is the bottom redshift and the least luminous TDE detected so far. Furthermore, ASASSN-23bd exhibited a speedy mild curve rise—of lower than 15 days. This makes it one of many low luminosity and quick (LLaF) tidal disruption occasion.
The researchers added that attributable to its low luminosity, ASASSN-23bd might not have been detected if it weren’t so near the Earth.
“On this sense, ASASSN-23bd is a wonderful however lucky addition to the gathering of LLaF TDEs,” the authors of the research wrote.
Hoogendam’s group hopes that extra LLaF TDEs like ASASSN-23bd might be found by deeper sky surveys, which could be carried out by amenities such because the Massive Synoptic Survey Telescope (LSST). Astronomers predict that LSST is able to figuring out about 1,000 TDEs per 12 months.
Extra info:
W. B. Hoogendam et al, Discovery and Observe-up of ASASSN-23bd (AT 2023clx): The Lowest Redshift and Least Luminous Tidal Disruption Occasion To Date, arXiv (2024). DOI: 10.48550/arxiv.2401.05490
Journal info:
arXiv
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