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A Black Gap has Destroyed a Star, and Used the Wreckage to Pummel One other Star

October 12, 2024
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A Black Gap has Destroyed a Star, and Used the Wreckage to Pummel One other Star
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When a supermassive black gap consumes a star, it doesn’t simply swallow it complete. It shreds the star, ripping it aside little by little earlier than consuming the stays. It’s a messy course of generally known as a tidal disruption occasion (TDE). Astronomers often catch a glimpse of TDEs, and one latest one has helped remedy a thriller a couple of kind of transient X-ray supply.

Often known as quasi-periodic eruptions (QPEs), they’re tender X-rays that emanate from the facilities of galaxies each few hours or a number of weeks. QPEs are uncommon, so they’re tough to review, and we aren’t positive what causes them. One thought is that they’re brought on by a big star or stellar black gap orbiting the supermassive black gap in such a method that its orbit intersects with the accretion disk of the supermassive black gap. Every time the smaller object passes by way of the disk, it triggers superheated plasma to launch X-rays. We’ve seen a similar effect with blazars, for example.

Given the brief periodicity of QPEs the companion object would wish to orbit the black gap very intently, simply on the sting of a secure orbit distance. And when it begins intersecting with accretion disk materials, its orbit will decay on a brief cosmic timescale. This could clarify why QPEs are so uncommon. However to show this mannequin, astronomers would wish to watch this occurring in actual time, which is what a group of astronomers has lately finished. The outcomes will likely be printed in Nature later this month.

AT2019qiz seen in X-ray and optical gentle. Credit score: X-ray: NASA/CXC/Queen’s Univ. Belfast/M. Nicholl et al.; Optical/IR: PanSTARRS, NSF/Legacy Survey/SDSS

The story begins with an commentary by the Zwicky Transient Facility again in 2019. The ZTF captured an optical flare that had all of the markings of a tidal disruption occasion. It got here to be generally known as TDE AT2019qiz. In accordance with black gap fashions, when a star is ripped aside, a lot of the fabric types an accretion disk across the black gap inside a number of years. This could make for excellent QPE situations if there was a detailed companion object. So the group aimed the Chandra X-ray Observatory at AT2019qiz often, hoping to seize a quasi-periodic eruption. Positive sufficient, in 2023, the group began to watch X-ray flashes erupting about each 48 hours. Observations from the Swift and AstroSAT telescopes additional confirmed the outcome.

It isn’t recognized whether or not the companion is a star or small black gap, and the group want to seize extra QPEs occurring after recognized tidal disruption occasions, however this preliminary result’s fairly clear.

Reference: Nicholl, M., et al. “Quasi-periodic X-ray eruptions years after a nearby tidal disruption event.” arXiv preprint arXiv:2409.02181 (2024).

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