SDSS J1001+5027: Strong microlensing-induced chromatic variation caught in the act
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| Format: | Preprint |
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2025
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| _version_ | 1866918134250733568 |
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| author | Goicoechea, Luis J. Shalyapin, Vyacheslav N. |
| author_facet | Goicoechea, Luis J. Shalyapin, Vyacheslav N. |
| contents | We conducted long-term monitoring of the doubly imaged gravitationally lensed quasar SDSS J1001+5027 consisting of spectro-photometric observations separated by $\sim$120 days (time delay between both quasar images), as well as test and auxiliary data. This monitoring approach allowed us to reliably find a strong microlensing-induced chromatic variation of the quasar continuum in the period 2022$-$2025. The ongoing microlensing event has caused the delay-corrected spectral flux ratio in 2025 to have a dramatic changing look, opening the door to very promising observations of the system in the coming years. These future follow-up observations of such a rare event are expected to provide critical information to discuss, among other things, the structure of the inner accretion flow towards the central supermassive black hole in SDSS J1001+5027. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_02169 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | SDSS J1001+5027: Strong microlensing-induced chromatic variation caught in the act Goicoechea, Luis J. Shalyapin, Vyacheslav N. Astrophysics of Galaxies We conducted long-term monitoring of the doubly imaged gravitationally lensed quasar SDSS J1001+5027 consisting of spectro-photometric observations separated by $\sim$120 days (time delay between both quasar images), as well as test and auxiliary data. This monitoring approach allowed us to reliably find a strong microlensing-induced chromatic variation of the quasar continuum in the period 2022$-$2025. The ongoing microlensing event has caused the delay-corrected spectral flux ratio in 2025 to have a dramatic changing look, opening the door to very promising observations of the system in the coming years. These future follow-up observations of such a rare event are expected to provide critical information to discuss, among other things, the structure of the inner accretion flow towards the central supermassive black hole in SDSS J1001+5027. |
| title | SDSS J1001+5027: Strong microlensing-induced chromatic variation caught in the act |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2509.02169 |