Astronomers have identified 20 ultraviolet-emitting supernova remnants in the Andromeda galaxy

Astronomers have identified twenty ultraviolet-emitting supernova remnants in the Andromeda galaxy

The positions of the 20 SNRs with detected diffuse ultraviolet emission (crimson squares) and 5 SNRs with potential, however confounded, diffuse emission (blue squares), superimposed on the picture of the Andromeda Galaxy in filter F148W. Credit score: Leahy et al., 2023

Utilizing the AstroSat satellite tv for pc, astronomers from the College of Calgary, Canada, have positioned 20 supernova remnants (SNRs) within the Andromeda galaxy, which present diffuse ultraviolet emission. The findings are introduced in a analysis paper printed January 25 within the arXiv Preprint server, which may help us perceive the origin and traits of UV emission in SNRs.

SNRs are diffuse, elongating constructions generated by a Supernova explosion. They include ejected matter increasing from the explosion and different interstellar materials that has been swept away by the shock wave from the exploding star.

Research of supernova remnants are essential to Astronomy scientistsas a result of it performs a serious position within the evolution of galaxies, and the scattering of galaxies heavy objects Made in a supernova explosion and supply the power wanted to warmth the interstellar medium. SNRs are additionally regarded as chargeable for accelerating galactic cosmic rays.

Though many extragalactic SNRs have been found thus far, those who show ultraviolet emissions are arduous to search out, primarily as a result of robust interstellar extinction of our galaxy within the ultraviolet. What’s noteworthy, regardless of current advances in UV-based SNR analysis, is that there’s nonetheless no catalog of extragalactic UV-emitting SNRs.

That is why a crew of astronomers led by Dennis Leahy determined to conduct a seek for ultraviolet-emitting SNRs within the close by galaxy Andromeda (often known as Messier 31, or M31), with the aim of making the primary catalog of such objects within the final galaxy. For this function they used the AstroSat Ultraviolet Imaging Telescope (UVIT).

Ultraviolet photographs of M31 have been obtained by the Ultraviolet Imaging Telescope on the AstroSat satellite tv for pc, and an inventory of SNRs was obtained from the X-ray, optical and radio catalogs of SNRs in M31. We used UVIT photographs to search out SNRs with diffuse emission, deleting these which might be very polluted. by stellar emissions,” the researchers wrote within the paper.

The crew initially chosen 177 SNRs with a purpose to examine whether or not or not they show diffuse UV emissions. From the complete pattern, 20 of the supernova remnants have been proven to be ultraviolet emitters. Chosen sources show diffuse emission not related to stars, though the power of diffuse emission varies.

Astronomers in contrast the band luminosity of those 20 SNRs with the band luminosities of seven beforehand identified ultraviolet-emitting SNRs within the Milky Method, the Massive Magellanic Cloud (LMC) and Small Magellanic Clouds (SMC). In consequence, they discovered comparable spectral shapes between identified SNRs and SNRs within the Andromeda galaxy. The outcomes point out that the emission of ultraviolet radiation from Supernova remnant reported within the paper that line emission is dominated and that this emission is related to SNRs.

The examine authors suggest spectral observations to verify the linear nature of the UV emissions from the newly recognized SNRs. Nonetheless, they level out that it could be troublesome to carry out spectral evaluation of the usually crowded areas within the Andromeda galaxy the place these SNRs are positioned.

extra info:
Denis Leahy et al, Discovery of 20 UV-emitting SNRs in M31 with UVIT, arXiv (2023). DOI: 10.48550/arxiv.2301.10381

Journal info:

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