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Naslov: A systematically selected sample of luminous, long-duration, ambiguous nuclear transients Avtorji: ID Wiseman, P. (Avtor) ID Williams, R. D. (Avtor) ID Arcavi, I. (Avtor) ID Galbany, L. (Avtor) ID Graham, M. J. (Avtor) ID Hönig, S. (Avtor) ID Newsome, M. (Avtor) ID Subrayan, B. (Avtor) ID Sullivan, Mark (Avtor) ID Petrushevska, Tanja (Avtor) Datoteke: 2406.11552v2.pdf (5,37 MB) MD5: 087DA9CE9A276B6FCC37C0C6FAB53E4B   https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/staf116/61531394/staf116.pdf   https://academic.oup.com/mnras/article-pdf/537/2/2024/61531394/staf116.pdf   To gradivo ima še več datotek. Celoten seznam je na voljo spodaj. Jezik: Angleški jezik Vrsta gradiva: Neznano Tipologija: 1.01 - Izvirni znanstveni članek Organizacija: UNG - Univerza v Novi Gorici Opis: ABSTRACT We present a search for luminous long-duration ambiguous nuclear transients (ANTs) similar to the unprecedented discovery of the extreme ambiguous event AT2021lwx with a $\gt 150$ d rise time and luminosity $10^{45.7}$ erg s$^{-1}$. We use the Lasair transient broker to search Zwicky Transient Facility (ZTF) data for transients lasting more than one year and exhibiting smooth declines. Our search returns 59 events, 7 of which we classify as ANTs assumed to be driven by accretion onto supermassive black holes. We propose the remaining 52 are stochastic variability from regular supermassive black hole accretion rather than distinct transients. We supplement the seven ANTs with three nuclear transients in ZTF that fail the light curve selection but have clear single flares and spectra that do not resemble typical active galactic nucleus. All of these 11 ANTs have a mid-infrared flare from an assumed dust echo, implying the ubiquity of dust around the black holes giving rise to ANTs. No events are more luminous than AT2021lwx, but one (ZTF19aamrjar) has twice the duration and a higher integrated energy release. On the other extreme, ZTF20abodaps reaches a luminosity close to AT2021lwx with a rise time $\lt 20$ d and that fades smoothly in $\gt 600$ d. We define a portion of rise-time versus flare amplitude space that selects ANTs with $\sim 50$ per cent purity against variable AGNs. We calculate a volumetric rate of $\gtrsim 3\times 10^{-11}$ Mpc$^{-1}$ yr$^{-1}$, consistent with the events being caused by tidal disruptions of intermediate and high-mass stars. Ključne besede: tidal disruption events, accretion Status publikacije: Objavljeno Verzija publikacije: Objavljena publikacija Datum objave: 01.01.2025 Leto izida: 2025 Št. strani: str. 2024–2045 Številčenje: Vol. 537, issue 2 PID: 20.500.12556/RUNG-9832  ISSN: 0035-8711 COBISS.SI-ID: 225362435  UDK: 52 ISSN pri članku: 0035-8711 eISSN: 1365-2966 DOI: https://doi.org/10.1093/mnras/staf116  NUK URN: URN:SI:UNG:REP:QDQEFUGR Datum objave v RUNG: 06.02.2025 Število ogledov: 367 Število prenosov: 8 Metapodatki:    Citiraj gradivo Navadno besedilo BibTeX EndNote XML EndNote/Refer RIS ABNT ACM Ref AMA APA Chicago 17th Author-Date Harvard IEEE ISO 690 MLA Vancouver : Kopiraj citat

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Gradivo je del revije

Naslov:	Monthly notices of the royal astronomical society
Skrajšan naslov:	Mon. Not. R. Astron. Soc.
Založnik:	Blackwell Scientific Publications
ISSN:	0035-8711
COBISS.SI-ID:	25980416

Licence

Licenca:	CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
Povezava:	http://creativecommons.org/licenses/by/4.0/deed.sl
Opis:	To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
Začetek licenciranja:	22.01.2025

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