Saturday 15 March 2025
Astronomers have long been fascinated by the mysterious and powerful events known as tidal disruption events (TDEs). When a star wanders too close to a supermassive black hole, it’s torn apart by the intense gravity, unleashing a burst of energy that can be seen from millions of light-years away. But TDEs are notoriously tricky to study, as they’re often hidden behind thick veils of gas and dust.
A new paper published in The Astrophysical Journal has shed some much-needed light on this phenomenon. By analyzing data from the Sloan Digital Sky Survey (SDSS) and other sources, researchers have identified seven potential TDE candidates, including one that’s particularly intriguing due to its unusual behavior.
The candidate, dubbed SDSS J2308, is a quasar – an incredibly luminous galaxy at the center of which lies a supermassive black hole. Quasars are thought to be powered by TDEs, but they can also be driven by other mechanisms, such as the accretion of gas and dust onto the black hole.
What sets SDSS J2308 apart is its unusual light curve – the way it brightens and dims over time. While quasars typically show a gradual increase in brightness followed by a steady decline, SDSS J2308’s light curve exhibits a sudden, steep rise followed by a slower decline. This behavior could be indicative of a TDE, but more data is needed to confirm this.
To get a better look at SDSS J2308, the researchers used a combination of spectroscopic and photometric observations. Spectroscopy involves breaking down light into its component colors, allowing astronomers to analyze the chemical makeup of distant objects. Photometry, on the other hand, measures the total amount of light emitted by an object.
By combining these techniques, the team was able to create a detailed picture of SDSS J2308’s properties. They found that it has a blackbody temperature and radius consistent with those expected for a TDE. This suggests that the object is indeed a quasar powered by a supermassive black hole – but what kind of black hole?
The researchers also used computer simulations to model the behavior of SDSS J2308. These simulations suggested that the object could be powered by either a TDE or a more conventional quasar, driven by the accretion of gas and dust onto the black hole.
Cite this article: “Mysterious Quasar Behaves Like Potential Tidal Disruption Event”, The Science Archive, 2025.
Tidal Disruption Events, Supermassive Black Holes, Stars, Quasars, Sloan Digital Sky Survey, Astrophysical Journal, Light Curves, Spectroscopy, Photometry, Computer Simulations, Galaxy Centers.
