Yeni bir Kozmik Patlama Fenomeni Tanımlanmış Olabilir (AT2022aedm Olayı ve LFC'ler)

Nat Alianovna

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3977 Mesaj

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Standart süpernova lokasyon beklentilerine, parlaklık ve ömür örüntülerine ve açıklama modellerine tam uymayan çok daha parlak ancak çok daha kısa ömürlü bir geçici kozmik parıldama cinsinin - literatürde iki tane daha benzer olayın bulunduğunun keşfedilmesiyle beraber - üçüncüsü yakın zamanda gözlemlenmiş. Şimdi resmen çabuk soğuyan parıltılar (luminous fast coolers, LFCs) başlığı altında ele alınıyorlar ve süpernovalardan tamamen bağımsız bir astronomik olay olmaya adaylar. Araştırma grubuna göre bu tarz beklenmedik bir olayın - ki kozmik ölçekte çabucak sönümlenen muazzam güçte bir patlamadan söz ediyoruz - en olası izahı bir karadelikle bir yıldızın çarpışması. Yine de ekibe göre daha çok örnek, daha çok gözlem ve daha çok çalışma şart:

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metni:

We present the discovery and extensive follow-up of a remarkable fast-evolving optical transient, AT2022aedm, detected by the Asteroid Terrestrial impact Last Alert Survey (ATLAS). AT2022aedm exhibited a rise time of 9±1 days in the ATLAS o-band, reaching a luminous peak with Mg ≈ −22 mag. It faded by 2 magnitudes in g-band during the next 15 days. These timescales are consistent with other rapidly evolving transients, though the luminosity is extreme. Most surprisingly, the host galaxy is a massive elliptical with negligible current star formation. X-ray and radio observations rule out a relativistic AT2018cow-like explosion. A spectrum in the first few days after explosion showed short-lived He II emission resembling young core-collapse supernovae, but obvious broad supernova features never developed; later spectra showed only a fast-cooling continuum and narrow, blue-shifted absorption lines, possibly arising in a wind with v ≈ 2700 km s−1 . We identify two further transients in the literature (Dougie in particular, as well as AT2020bot) that share similarities in their luminosities, timescales, colour evolution and largely featureless spectra, and propose that these may constitute a new class of transients: luminous fast-coolers (LFCs). All three events occurred in passive galaxies at offsets of ∼ 4 − 10 kpc from the nucleus, posing a challenge for progenitor models involving massive stars or massive black holes. The light curves and spectra appear to be consistent with shock breakout emission, though usually this mechanism is associated with core-collapse supernovae. The encounter of a star with a stellar mass black hole may provide a promising alternative explanation.

https://hcvalidate.perfdrive.com/fb803c746e9148689b3984a31fccd902//?ssa=ec464c53-96a8-44b4-8cdf-a0c852d3ffaa&ssb=34451279101&ssc=https%3A%2F%2Fiopscience.iop.org%2Farticle%2F10.3847%2F2041-8213%2Facf0ba&ssi=97a12b0f-8427-4162-b563-ee08897e17b2&ssk=support@shieldsquare.com&ssm=87818185786365005103267104567403&ssn=78c8ae1d98fe7c400b363d0029eafeead27d7fd26b18-fd04-4ed4-9489ec&sso=42d56155-00dff38acbdb94670caf370e6a8bfb57a90895fbe8103ae7&ssp=90068441561694683175169463098869595&ssq=07463323107116172365531071159252525874780&ssr=MTA0LjI0Ny4xNzIuNjE=&sst=&ssu=&ssv=&ssw=&ssx=W10=

arxiv.org

AT2022aedm and a new class of luminous, fast-cooling transients in elliptical galaxies

https://arxiv.org/abs/2307.02556

https://arxiv.org/pdf/2307.02556.pdf

advanced science news

Cosmic explosion is one of the most powerful and rapid blasts ever seen by astronomers - Advanced Science News

https://www.advancedsciencenews.com/cosmic-explosion-is-one-of-the-most-powerful-and-rapid-blasts-ever-seen-by-astronomers/

phys.org

New class of super-bright exploding transient discovered

https://phys.org/news/2023-09-class-super-bright-transient.html

science times

Luminous Fast Coolers: Astronomers Find New Cosmic Explosion Class That Has the Brightness of Over 100 Billion Suns

https://www.sciencetimes.com/articles/45838/20230906/luminous-fast-coolers-astronomers-find-new-cosmic-explosion-class-brightness.htm

livescience.com

Astronomers discover new class of cosmic explosion brighter than 100 billion suns

https://www.livescience.com/space/astronomy/astronomers-discover-new-class-of-cosmic-explosion-brighter-than-100-billion-suns

space.com

Ultra-powerful space explosion, 1st of its kind, may have been triggered by black hole star-destroyer

https://www.space.com/1st-of-its-kind-explosion-luminous-fast-cooler-black-hole-star-destroyer

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Yeni bir Kozmik Patlama Fenomeni Tanımlanmış Olabilir (AT2022aedm Olayı ve LFC'ler)

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