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Pregled bibliografske jedinice broj: 844290

Časopis

Autori: Ahnen, Max Ludwig; ...; Babić, Ana; ...; Dominis Prester, Dijana; ...; Godinović, Nikola; ...; Hrupec, Dario; ...; Lelas, Damir; ...; Manganaro, Marina; ...; Puljak, Ivica; ...; Šnidarić, Iva; ...; Terzić, Tomislav ...; Zottmann, N.
Naslov: Very-high-energy gamma-rays from the Universe's middle age: detection of the z=0.940 blazar PKS 1441+25 with MAGIC
Izvornik: Astrophysical Journal Letters (2041-8205) 815 (2015), 2;
Vrsta rada: članak
Ključne riječi: cosmic background radiation ; galaxies: active ; galaxies: jets ; gamma rays: galaxies ; quasars: individual (PKS 1441+25)
Sažetak:
The flat-spectrum radio quasar PKS 1441+25 at a redshift of z = 0.940 is detected between 40 and 250 GeV with a significance of 25.5σ using the MAGIC telescopes. Together with the gravitationally lensed blazar QSO B0218+357 (z = 0.944), PKS 1441+25 is the most distant very high energy (VHE) blazar detected to date. The observations were triggered by an outburst in 2015 April seen at GeV energies with the Large Area Telescope on board Fermi. Multi-wavelength observations suggest a subdivision of the high state into two distinct flux states. In the band covered by MAGIC, the variability timescale is estimated to be 6.4 ± 1.9 days. Modeling the broadband spectral energy distribution with an external Compton model, the location of the emitting region is understood as originating in the jet outside the broad-line region (BLR) during the period of high activity, while being partially within the BLR during the period of low (typical) activity. The observed VHE spectrum during the highest activity is used to probe the extragalactic background light at an unprecedented distance scale for ground-based gamma-ray astronomy.
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: 844290.universe_middle_age_PKS144125.pdf (tekst priložen 14. Stu. 2016. u 14:52 sati)
URL Internet adrese: http://iopscience.iop.org/article/10.1088/2041-8205/815/2/L23
https://arxiv.org/abs/1512.04435
Broj citata:
Altmetric:
DOI: 10.1088/2041-8205/815/2/L23
URL cjelovitog teksta:
Google Scholar: Very-high-energy gamma-rays from the Universe's middle age: detection of the z=0.940 blazar PKS 1441+25 with MAGIC
Upisao u CROSBI: Dario Hrupec (dhrupec@fizika.unios.hr), 14. Stu. 2016. u 14:52 sati



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