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 (pink 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 revealed January 25 within the arXiv Preprint server, which can assist us perceive the origin and traits of UV emission in SNRs.

SNRs are diffuse, elongating buildings generated by a Supernova explosion. They comprise 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 significant 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 considered accountable for accelerating galactic cosmic rays.

Though many extragalactic SNRs have been found up to now, people who show ultraviolet emissions are exhausting to seek out, primarily because of the sturdy interstellar extinction of our galaxy within the ultraviolet. What’s noteworthy, regardless of latest advances in UV-based SNR analysis, is that there’s nonetheless no catalog of extragalactic UV-emitting SNRs.

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

Ultraviolet photos of M31 had 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 photos to seek out SNRs with diffuse emission, deleting these which might be very polluted. by stellar emissions,” the researchers wrote within the paper.

The staff initially chosen 177 SNRs in an effort to examine whether or not or not they show diffuse UV emissions. From the complete pattern, 20 of the supernova remnants had 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 research authors suggest spectral observations to verify the linear nature of the UV emissions from the newly recognized SNRs. Nevertheless, they level out that it could be tough to carry out spectral evaluation of the usually crowded areas within the Andromeda galaxy the place these SNRs are positioned.

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

Journal data:

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