Naslov
First detection of very-high-energy gamma-ray emission from the extreme blazar PGC 2402248 with the MAGIC telescopes

Autori
Mirzoyan, Razmik ; ... ; Babić, Ana ; ... ; Dominis Prester, Dijana ; ... ; Godinović, Nikola ; ... ; Hrupec, Dario ; ... ; Lelas, Damir ; ... ; Puljak, Ivica ; ... ; Surić, Tihomir ; ... ; Šnidarić, Iva ; ... ; Terzić, Tomislav ; ... (the MAGIC Collaboration)

Kolaboracija
MAGIC Collaboration

Izvornik
The Astronomer's Telegram, #11548

Vrsta, podvrsta
Ostale vrste radova, ostalo

Godina
2018

Ključne riječi
TeV ; VHE ; AGN ; Blazar

Sažetak
The MAGIC collaboration reports the first detection of very-high-energy (VHE ; E>100 GeV) gamma-ray emission from PGC 2402248, also known as 2WHSP J073326.7+515354 (Chang et al. 2016, A&A, 598, A17) with coordinates R.A.: 07:33:26.7 h, Dec: +51:53:54.99 deg. The source is classified as an extreme high-energy peaked BL Lacertae object of unknown redshift, included in the 2WHSP catalog with a synchrotron peak located at 10^17.9 Hz. PGC 2402248 was observed with the MAGIC telescopes from 2018/01/23 to 2018/04/18 (MJD 58141-58226) for about 23 h. The preliminary analysis of these data resulted in the detection of PGC 2402248 with a statistical significance of more than 6 standard deviations. The VHE integral flux was estimated to be (2.2 +/- 0.6)e-12 ph cm^-2 s-1 above 200 GeV, corresponding to around 1% of the Crab Nebula flux above the same energy threshold. The source was also observed with the XRT instrument on-board the Neil Gehrels Swift Observatory from 2018/01/26 to 2018/04/08 (MJD 58144-58216) with 7 visits almost contemporaneous to the MAGIC observations. The preliminary analysis performed with the publicly available tools (http://www.swift.ac.uk/results/index.php) shows a hint of flux variability from a minimum count rate of 0.43 (MJD 58164) to a maximum of 0.62 cnt/s during the last observation (MJD 58216), in the 0.3-10 keV range. MAGIC and Swift/XRT observations of PGC 2402248 will continue during the next days and multiwavelength observations are encouraged. The MAGIC contact persons for these observations are R. Mirzoyan (Razmik.Mirzoyan@mpp.mpg.de), L. Foffano (luca.foffano@phd.unipd.it) and J. Becerra Gonzalez (jbecerra@iac.es). MAGIC is a system of two 17m-diameter Imaging Atmospheric Cherenkov Telescopes located on the Canary island of La Palma, Spain, and designed to perform gamma-ray astronomy in the energy range from 50 GeV to greater than 50 TeV. We would like to thank the Swift Team for making these observations possible.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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