AT 2023clx: The Faintest and Closest Optical Tidal Disruption Event Discovered in Nearby Star-forming Galaxy NGC 3799
Autor: | Jiazheng Zhu, Ning Jiang, Tinggui Wang, Shifeng Huang, Zheyu Lin, Yibo Wang, Jian-Guo Wang |
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Jazyk: | angličtina |
Rok vydání: | 2023 |
Předmět: | |
Zdroj: | The Astrophysical Journal Letters, Vol 952, Iss 2, p L35 (2023) |
Druh dokumentu: | article |
ISSN: | 2041-8213 2041-8205 |
DOI: | 10.3847/2041-8213/ace625 |
Popis: | We report the discovery of a faint optical tidal disruption event (TDE) in the nearby star-forming galaxy NGC 3799. Identification of the TDE is based on its position at the galaxy nucleus, a light curve declining as t ^−5/3 , a blue continuum with an almost constant blackbody temperature of ∼12,000 K, broad (≈15,000 km s ^−1 ) Balmer lines, and characteristic He ii 4686 Å emission. The light curve of AT 2023clx peaked at an absolute magnitude of −17.16 mag in the g band and a maximum blackbody bolometric luminosity of 4.56 × 10 ^42 erg s ^−1 , making it the faintest TDE discovered to date. With a redshift of 0.01107 and a corresponding luminosity distance of 47.8 Mpc, it is also the closest optical TDE ever discovered to the best of our knowledge. Furthermore, our analysis of Swift/XRT observations of AT 2023clx yields a very tight 3 σ upper limit of 9.53 × 10 ^39 erg s ^−1 in the range 0.3–10 keV. AT 2023clx, together with very few other faint TDEs such as AT 2020wey, prove that there are probably a large number of faint TDEs yet to be discovered at higher redshifts, which is consistent with the prediction of luminosity functions (LFs). The upcoming deeper optical time-domain surveys, such as the Legacy Survey of Space and Time and the Wide Field Survey Telescope, will discover more TDEs at even lower luminosities, allowing for a more precise constraint of the low end of the LF. |
Databáze: | Directory of Open Access Journals |
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