crta
Hrvatska znanstvena Sekcija img
bibliografija
3 gif
 Naslovna
 O projektu
 FAQ
 Kontakt
4 gif
Pregledavanje radova
Jednostavno pretraživanje
Napredno pretraživanje
Skupni podaci
Upis novih radova
Upute
Ispravci prijavljenih radova
Ostale bibliografije
Slični projekti
 Bibliografske baze podataka

Pregled bibliografske jedinice broj: 903932

Časopis

Autori: Ahnen, Max Ludwig; ...; Babić, Ana; ...; Dominis Prester, Dijana; ...; Godinović, Nikola; ...; Hrupec, Dario; ...; Kuveždić, Danijela; ...; Lelas, Damir; ...; Manganaro, Marina; ...; Puljak, Ivica; ...; Šnidarić, Iva; ...; Surić, Tihomir; ...; Terzić, Tomislav; ...; Zarić, Darko
Naslov: Search for very high-energy gamma-ray emission from the microquasar Cygnus X-1 with the MAGIC telescopes
Izvornik: Monthly notices of the Royal Astronomical Society (0035-8711) 472 (2017), 3; 3474-3485
Vrsta rada: članak
Ključne riječi: gamma rays: general ; binaries: general ; X-rays: binaries ; X-rays: individual (Cygnus X-1, Cyg X-1) ; Stars: black holes ; Stars: individual (HD 226868)
Sažetak:
The microquasar Cygnus X-1 displays the two typical soft and hard X-ray states of a black- hole transient. During the latter, Cygnus X-1 shows a one-sided relativistic radio-jet. Recent detection of the system in the high energy (HE ; E >= 60 MeV) gamma-ray range with Fermi-LAT associates this emission with the outflow. Former MAGIC observations revealed a hint of flaring activity in the very high- energy (VHE ; E >= 100 GeV) regime during this X-ray state. We analyze ∼ 97 hr of Cygnus X-1 data taken with the MAGIC telescopes between July 2007 and October 2014. To shed light on the correlation between hard X-ray and VHE gamma rays as previously suggested, we study each main X-ray state separately. We perform an orbital phase-folded analysis to look for variability in the VHE band. Additionally, to place this variability behavior in a multiwavelength context, we compare our results with Fermi-LAT, AGILE, Swift-BAT, MAXI, RXTE- ASM, AMI and RATAN-600 data. We do not detect Cygnus X-1 in the VHE regime. We establish upper limits for each X-ray state, assuming a power-law distribution with photon index GAMMA = 3.2. For steady emission in the hard and soft X-ray states, we set integral upper limits at 95% confidence level for energies above 200 GeV at 2.6 × 10^−12 photons cm^−2 s^−1 and 1.0 × 10^−11 photons cm^−2 s^−1, respectively. We rule out steady VHE gamma-ray emission above this energy range, at the level of the MAGIC sensitivity, originating in the interaction between the relativistic jet and the surrounding medium, while the emission above this flux level produced inside the binary still remains a valid possibility.
Projekt / tema: HRZZ-IP-2016-06-9782
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: 903932.microquasar_Cygnus_X-1.pdf (tekst priložen 7. Stu. 2017. u 19:43 sati)
URL Internet adrese: https://academic.oup.com/mnras/article-abstract/472/3/3474/4082239?redirectedFrom=fulltext
Broj citata:
Altmetric:
DOI: 10.1093/mnras/stx2087
URL cjelovitog teksta:
Google Scholar: Search for very high-energy gamma-ray emission from the microquasar Cygnus X-1 with the MAGIC telescopes
Upisao u CROSBI: Dario Hrupec (dhrupec@fizika.unios.hr), 7. Stu. 2017. u 19:43 sati



  Verzija za printanje   za tiskati


upomoc
foot_4