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 (purple 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 situated 20 supernova remnants (SNRs) within the Andromeda galaxy, which present diffuse ultraviolet emission. The findings are offered in a analysis paper revealed 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 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 necessary to Astronomy scientistsas a result of it performs a significant position within the evolution of galaxies, and the scattering of galaxies heavy gadgets Made in a supernova explosion and supply the power wanted to warmth the interstellar medium. SNRs are additionally considered answerable for accelerating galactic cosmic rays.

Though many extragalactic SNRs have been found up to now, those who show ultraviolet emissions are laborious to search 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 workforce 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 purpose of making the primary catalog of such objects within the final galaxy. For this objective they used the AstroSat Ultraviolet Imaging Telescope (UVIT).

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

The workforce initially chosen 177 SNRs in an effort to examine whether or not or not they show diffuse UV emissions. From the total 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 recognized ultraviolet-emitting SNRs within the Milky Manner, the Massive Magellanic Cloud (LMC) and Small Magellanic Clouds (SMC). Because of this, they discovered related spectral shapes between recognized 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 substantiate the linear nature of the UV emissions from the newly recognized SNRs. Nonetheless, they level out that it might be troublesome to carry out spectral evaluation of the usually crowded areas within the Andromeda galaxy the place these SNRs are situated.

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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