Very high-energy<i>γ</i>-ray emission from IC 310

Neronov, A.; Semikoz, D.; Vovk, Ievgen

doi:10.1051/0004-6361/201014499

Cited by 66 publications

(69 citation statements)

References 22 publications

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“…Incidentally, we have noted that the shortest upper limit measured in this work (τ < 2.3 h) can be set in the case of PKS B1222+216, which was also recently detected above 100 GeV by MAGIC (70−400 GeV, Mariotti et al 2010;Aleksić et al 2011) and Fermi/LAT (Neronov et al 2010), the latter by integrating the data collected over several days. The GeV flux resulted to be also extremely variable, with doubling time scale of the order of 10 min, which is now the shortest time scale ever detected in a FSRQ (Aleksić et al 2011).…”

Section: Final Remarkssupporting

confidence: 67%

Search for the shortest variability at gamma rays in flat-spectrum radio quasars

Foschini

Ghisellini

Tavecchio

et al. 2011

A&A

125

116

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We report about the search for short-term variability in the high-energy γ-ray energy band of three flat-spectrum radio quasars (3C 454.3, 3C 273, PKS B1222+216), whose flux at E > 100 MeV exceeded the value of 10 −5 ph cm −2 s −1 for at least one day. Although, the statistics was not yet sufficient to effectively measure the characteristic time scale, it allowed us to set tight upper limits on the observed doubling time scale (<2-3 h) -the smallest measured to date at MeV energies -, which can constrain the size of the γ-ray emitting region. The results obtained in the present work favor the hypothesis that γ rays are generated inside the broad-line region.

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Section: Final Remarkssupporting

confidence: 67%

Search for the shortest variability at gamma rays in flat-spectrum radio quasars

Foschini

Ghisellini

Tavecchio

et al. 2011

A&A

125

116

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“…This ensures that it should be readily detectable with ground-based γ-ray telescopes. 4C +21.35 at z = 0.432 is an intermediate redshift BL Lac that exhibited a γ-ray flare in April−May 2010 (Donato 2010) during which both E > 100 GeV photons associated with the source were detected, resulting in the detection of the source with 5.6σ significance above 100 GeV (Neronov et al 2010a). The detection of the source above 100 GeV was recently confirmed with MAGIC observations of the source .…”

Section: Sources Detected At ≥4σ Level At E ≥ 100 Gevmentioning

confidence: 77%

High Galactic latitudeFermisources ofγ-rays with energies above 100 GeV

Neronov¹,

Semikoz²,

Vovk³

2011

A&A

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Aims. We present a catalog of sources of very high energy (E > 100 GeV) γ-rays detected by the Large Area Telescope (LAT) onboard the Fermi Gamma-Ray Space Telescope at Galactic latitudes |b| ≥ 10 • . Methods. We cross-correlate the directions of individual photons with energies above 100 GeV detected by Fermi /LAT with the first year Fermi catalog of sources detected at lower energies. We find a significant correlation between the arrival directions of the highest energy photons and positions of Fermi sources, with the possibility of chance coincidences at the level of 10 −45 . We present a list of Fermi sources contributing to the correlation signal. A similar analysis is performed to cross-correlate the catalog of BL Lac objects with the highest energy photons detected by Fermi. Results. We produce a catalog of high Galactic latitude Fermi sources visible at 100−300 GeV energies. The catalog is divided into two parts. The first part contains a list of 50 higher significance sources among which there can be three possible false detections. The second part of the catalog contains a list of 25 lower significance sources, among which six are possibly false detections. Finally we identify eight additional sources from the cross-correlation analysis with the BL Lac catalog. The reported sources of E > 100 GeV γ-rays span a broad range of redshifts, up to z ∼ 1. Most of the sources are BL Lac type objects. Only 17 out of 83 objects in our list were previously reported as VHE γ-ray sources.

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“…The nearby galaxy IC 310 (S0, z = 0.01898), which is located in the Perseus cluster of galaxies, exhibits an active nucleus, which was recently detected at high energies above 30 GeV with Fermi-LAT [1] as well as at very high energies above 260 GeV with the MAGIC Telescopes [2]. X-ray observations with XMM-Newton showed non-thermal emission originating from a point-like source [3].…”

Section: Ic 310: the Parsec Scale Jet Of A γ-Ray Loud Objectmentioning

confidence: 99%