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Pregled bibliografske jedinice broj: 470465

Časopis

Autori: Aleksić, Jelena; ...; Dominis Prester, Dijana; ...; Ferenc, Daniel; ...; Godinović, Nikola; ...; Hrupec, Dario; ...; Puljak, Ivica; ...; Surić, Tihomir; ...; Terzić, Tomislav
Naslov: MAGIC constraints on Gamma-ray emission from Cygnus X-3
Izvornik: The Astrophysical journal (0004-637X) 721 (2010), 1; 843-855
Vrsta rada: članak
Ključne riječi: acceleration of particles; binaries: general; gamma rays: observations; X-rays: bina- ries — X-rays: individual (Cygnus X-3)
Sažetak:
Cygnus X-3 is a microquasar consisting of an accreting compact object orbiting around a Wolf-Rayet star. It has been detected at radio frequencies and up to high-energy gamma rays (above 100 MeV). However, many models predict also a very-high-energy (VHE) emission (above hundreds of GeV) when the source displays relativistic persistent/transient ejections. Therefore, detecting such emission would improve the understanding of the jet physics. The imaging atmospheric Cherenkov telescope MAGIC observed Cygnus X-3 for about 70 hours between 2006 March and 2009 August in different X-ray/radio spectral states and also during a period of enhanced gamma-ray emission. MAGIC found no evidence for a VHE signal from the direction of the microquasar. An upper limit to the integral flux for energies higher than 250 GeV has been set to 2.2 x 10-12 photons cm-2 s-1 (95% confidence level). This is the best limit so far to the VHE emission from this source. The non-detection of a VHE signal during the period of activity in the high-energy band sheds light on the location of the possible VHE radiation favoring the emission from the innermost region of the jets, where absorption is significant. The current and future generations of Cherenkov telescopes may detect a signal under precise spectral conditions.
Projekt / tema: 098-0982931-2875, HRZZ-02.01/12
Izvorni jezik: ENG
Rad je indeksiran u
bazama podataka:
Current Contents Connect (CCC)
Scopus
SCI-EXP, SSCI i/ili A&HCI
Science Citation Index Expanded (SCI-EXP) (sastavni dio Web of Science Core Collectiona)
Kategorija: Znanstveni
Znanstvena područja:
Fizika
Puni text rada: 470465.CygnusX3new.pdf
URL Internet adrese: http://iopscience.iop.org/0004-637X/721/1/843/
http://lanl.arxiv.org/abs/1005.0740v1
Broj citata:
Altmetric:
DOI: 10.1088/0004-637X/721/1/843
URL cjelovitog teksta:
Google Scholar: MAGIC constraints on Gamma-ray emission from Cygnus X-3
Upisao u CROSBI: dhrupec@irb.hr (dhrupec@irb.hr), 8. Svi. 2010. u 22:22 sati



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