Repozitorij Univerze v Novi Gorici

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Naslov:A search for Galactic transients disguised as gamma-ray bursts
Avtorji:ID Clerici, Aurora, Department of Physics and Earth Sciences, University of Ferrara, via Saragat 1, 44122 Ferrara, Italy (Avtor)
ID Guidorzi, Cristiano, Department of Physics and Earth Sciences, University of Ferrara, via Saragat 1, 44122 Ferrara, Italy (Avtor)
ID La Parola, Valentina, INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica di Palermo, via U. La Malfa 153, 90146 Palermo, Italy (Avtor)
Datoteke: Gradivo nima datotek, ki so prostodostopne za javnost. Gradivo je morda fizično dosegljivo v knjižnici fakultete, zalogo lahko preverite v COBISS-u. Povezava se odpre v novem oknu
Jezik:Angleški jezik
Vrsta gradiva:Delo ni kategorizirano
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:UNG - Univerza v Novi Gorici
Opis:A significant fraction of cosmological gamma-ray bursts (GRBs) are characterised by a fast rise and exponential decay (FRED) temporal structure. This is not a distinctive feature of this class, since it is observed in many Galactic transients and is likely descriptive of a sudden release of energy followed by a diffusion process. Possible evidence has recently been reported by Tello et al. (2012) for a Galactic contamination in the sample of FRED GRBs discovered with Swift. We searched for possible Galactic intruders disguised as FRED GRBs in the Swift catalogue up to September 2014. We selected 181 FRED GRBs (2/3 with unknown redshift) and considered different subsamples. We tested the degree of isotropy through the dipole and the quadrupole moment distributions, both with reference to the Galaxy and in a coordinate-system-independent way, as well as with the two-point angular autocovariance function. In addition, we searched for possible indicators of a Galactic origin among the spectral and temporal properties of individual GRBs. We found marginal (~3 sigma) evidence for an excess of FREDs with unknown redshift towards the Galactic plane compared with what is expected for an isotropic distribution corrected for the non-uniform sky exposure. However, when we account for the observational bias against optical follow-up observations of low-Galactic latitude GRBs, the evidence for anisotropy decreases to ~2 sigma. In addition, we found no statistical evidence for different spectral or temporal properties from the bulk of cosmological GRBs. We found marginal evidence for the presence of a disguised Galactic population among Swift GRBs with unknown redshift. The estimated fraction is f=(19 +- 11)%, with an upper limit of 34% (90% confidence).
Ključne besede:gamma-ray burst, statistical, Galactic transient
Verzija publikacije:Objavljena publikacija
Leto izida:2015
Št. strani:6
Številčenje:A106, 582
PID:20.500.12556/RUNG-2091 Novo okno
COBISS.SI-ID:4137979 Novo okno
DOI:10.1051/0004-6361/201526778 Novo okno
NUK URN:URN:SI:UNG:REP:TBGTWOZ7
Datum objave v RUNG:03.02.2016
Število ogledov:6105
Število prenosov:0
Metapodatki:XML DC-XML DC-RDF
:
CLERICI, Aurora, GUIDORZI, Cristiano in LA PAROLA, Valentina, 2015, A search for Galactic transients disguised as gamma-ray bursts. Astronomy and Astrophysics [na spletu]. 2015. Vol. A106, no. 582. [Dostopano 8 april 2025]. DOI 10.1051/0004-6361/201526778. Pridobljeno s: https://repozitorij.ung.si/IzpisGradiva.php?lang=slv&id=2091
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Gradivo je del revije

Naslov:Astronomy and Astrophysics
Skrajšan naslov:A&A
Založnik:Hans Publishers (汉斯出版社)EDP Sciences
ISSN:0004-6361

Licence

Licenca:CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
Opis:Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.
Začetek licenciranja:02.02.2016

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