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Pregled bibliografske jedinice broj: 523023

Časopis

Autori: Aleksić, Jelena; ...; Dominis Prester, Dijana; ...; Ferenc, Daniel; ...; Godinović, Nikola; ...; Hrupec, Dario; ...; Lelas, Damir; ...; Puljak, Ivica; ...; Surić, Tihomir; ...; Šnidarić, Iva; ...; Terzić, Tomislav; ...; Ghisellini, G.
Naslov: MAGIC observations of the giant radio galaxy M 87 in a low-emission state between 2005 and 2007
Izvornik: Astronomy and astrophysics (0004-6361) 544 (2012); A96-1-A96-8
Vrsta rada: članak
Ključne riječi: galaxies: individual: M 87; gamma rays: galaxies
Sažetak:
We present the results of a long M 87 monitoring campaign in very high energy gamma- rays with the MAGIC-I Cherenkov telescope. We aim to model the persistent non-thermal jet emission by monitoring and characterizing the very high energy gamma-ray emission of M 87 during a low state. A total of 150 h of data were taken between 2005 and 2007 with the single MAGIC-I telescope, out of which 128.6 h survived the data quality selection. We also collected data in the X-ray and Fermi-LAT bands from the literature (partially contemporaneous). No flaring activity was found during the campaign. The source was found to be in a persistent low-emission state, which was at a confidence level of 7 sigma. We present the spectrum between 100 GeV and 2 TeV, which is consistent with a simple power law with a photon index GAMMA = 2.21 ± 0.21 and a flux normalization at 300 GeV of (7.7 +- 1.3) x 10^-8 TeV^-1 s^-1 m^-2. The extrapolation of the MAGIC spectrum into the GeV energy range matches the previously published Fermi-LAT spectrum well, covering a combined energy range of four orders of magnitude with the same spectral index. We model the broad band energy spectrum with a spine layer model, which can satisfactorily describe our data.
Projekt / tema: HRZZ-02.01/12, HRZZ-09/176
Izvorni jezik: ENG
Rad je indeksiran u
bazama podataka:
Current Contents Connect (CCC)
Scopus
SCI-EXP, SSCI i/ili A&HCI
Kategorija: Znanstveni
Znanstvena područja:
Fizika
Puni text rada: 523023.M87_low_state_2005_2007v2.pdf (tekst priložen 3. Pro. 2012. u 12:20 sati)
URL Internet adrese: http://fulir.irb.hr/1651/
http://arxiv.org/abs/1207.2147v2
http://www.aanda.org/articles/aa/abs/2012/08/aa17827-11/aa17827-11.html
Broj citata:
Altmetric:
DOI: 10.1051/0004-6361/201117827
URL cjelovitog teksta: http://fulir.irb.hr/1651/
Google Scholar: MAGIC observations of the giant radio galaxy M 87 in a low-emission state between 2005 and 2007
Upisao u CROSBI: dhrupec@irb.hr (dhrupec@irb.hr), 24. Kol. 2011. u 12:01 sati



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