Observations of T[CLC]e[/CLC]V Gamma-Ray Flares from Markarian 501with the Telescope Array Prototype

Hayashida, N.; Hirasawa, H.; Ishikawa, Fumihiro; Lafoux, H.; Nagano, M.; Nishikawa, D.; Ouchi, T.; Ohoka, H.; Ohnishi, M.; Sakaki, N.; Sasaki, M.; Shimodaira, Hidetoshi; Teshima, M.; Torii, R.; Yamamoto, T.; Yoshida, S.; Yuda, T.; Hayashi, Y.; Ito, N.; Kawakami, S.; Kawasaki, Y.; Matsuyama, T.; Sasano, M.; Takahashi, T.; Chamoto, N.; Kajino, F.; Sakata, M.; Sugiyama, T.; Tsukiji, M.; Yamamoto, Y.; Inoue, N.; Kusano, Eiji; Mizutani, K.; Shiomi, A.; Hibino, K.; Kashiwagi, T.; Nishimura, J.; Loh, E. C.; Sokolsky, P.; Taylor, Scott; Honda, K.; Kawasumi, N.; Tsushima, I.; Uchihori, Y.; Kitamura, Hisashi; Chikawa, M.; Kabe, S.; Mizumoto, Y.; Yoshii, H.; Hotta, N.; Saito, To.; Nakamura, Masaki; Kuramochi, H.; Sakumoto, K.

doi:10.1086/311574

Cited by 61 publications

(27 citation statements)

References 8 publications

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“…OJ 287 itself shows evidence for a helical jet in its 8.4-GHz VLBI map (Vicente, Charlot & Sol 1996). Other examples that present both helical jets and periodic light curves include 3C 120 (Webb 1990;Gómez, Marscher & Alberdi 1999b), 3C 345 (Webb et al 1988;Zensus, Cohen & Unwin 1995), AO 0235+16 (Jorstad et al 2001;Raiteri et al 2001), BL Lac (Tateyama et al 1998;Fan et al 1998), Mrk 501 (Xu et al 1995;Hayashida et al 1998) and PKS 0735+17 (Fan et al 1997;Gómez et al 1999a), and it has been proposed that most of these objects harbour a BBH system in their nuclei (Villata & Raiteri 1999;Caproni & Abraham 2004a,b;Ostorero, Villata & Raiteri 2004). In other words, the periodicity in the light curve and the helicity in the jet usually 'couple' in blazars and are interpreted within the scenario of a BBH system.…”

Section: The 'Coupling' Of Periodicity and Helicity In Blazarsmentioning

confidence: 99%

Optical monitoring of PKS 1510-089: a binary black hole system?

Zhou

Peng

et al. 2005

Monthly Notices of the Royal Astronomical Society

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Three deep flux minima with nearly the same time‐scales and intervals have been observed for the blazar PKS 1510−089 in the past few years. It has been proposed that there is a binary black hole system at the nucleus of this object, and a new minimum was predicted to occur in 2002 March. We monitored this source with a 60/90 cm Schmidt telescope from 2002 February to April. In combination with the data obtained by Xie et al. in the same period, for the 2002 minimum we present a nearly symmetric light curve, which would be required by an eclipsing model of a binary black hole system. We also constrain the time‐scale of the minimum to be 35 min, which is more consistent with the time‐scales (∼42 min) of the three previous minima than is the 89 min time‐scale given by Xie et al. The wiggling milliarcsecond radio jet observed in this object is taken as further evidence for the binary black hole system. The ‘coupling’ of the periodicity in the light curve and the helicity in the radio jet is discussed for blazars in the framework of a binary black hole system.

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Section: The 'Coupling' Of Periodicity and Helicity In Blazarsmentioning

confidence: 99%

Optical monitoring of PKS 1510-089: a binary black hole system?

Zhou

Peng

et al. 2005

Monthly Notices of the Royal Astronomical Society

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“…Among existing systems, the HEGRA 5-telescope IACT system has a characteristic spacing of 70 m between its central telescope and the corner telescopes. The WHIPPLE-GRANITE two-telescope system [5] had a spacing of 140 m. The Telescope Array [6] uses a spacing of 120 m between the first three telescopes, and later 70 m for the full array. Optimization of IACT system geometry is heavily based on Monte-Carlo simulations.…”

Section: Introductionmentioning

confidence: 99%

On the optimum spacing of stereoscopic imaging atmospheric Cherenkov telescopes

Hofmann

2000

Astroparticle Physics

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For stereoscopic systems of imaging atmospheric Cherenkov telescopes (IACTs), a key parameter to optimize the sensitivity for VHE γ-ray point sources is the intertelescope spacing. Using pairs of telescopes of the HEGRA IACT system, the sensitivity of two-telescope stereo IACT systems is studied as a function of the telescope spacing, ranging from 70 m to 140 m. Data taken during the 1997 outburst of Mrk 501 are used to evaluate both the detection rates before cuts, and the sensitivity for weak signals after cuts to optimize the significance of signals. Detection rates decrease by about 1/3 between the minimum and maximum spacing. The significance of signals is essentially independent of distance, in the range investigated.

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“…2. A significant steepening in the spectrum was reported also by the Whipple (Samuelson et al 1998), the Telescope Array (Hayashida et al 1998), andCAT (Djannati-Atai et al 1999) groups.…”

Section: Mkn 501mentioning

confidence: 65%

TeV gamma radiation of BL Lac objects Mkn 421 and Mkn 501

Aharonian

1999

Astron. Nachr.

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The current imaging atmospheric Cherenkov telescopes operating in the energy range from several hundred GeV to ≥ 20 TeV are nicely suited for study of high energy properties of nearby BL Lac objects. The ranges of timescales and flux variations of TeV flares of two representatives of this source population -Mkn 421 and Mkn 501 -are well-matched to the sensitivity of the best current ground-based detectors. On several occasions truly simultaneous observations of both sources in TeV and X-ray bands were available during last two years. These results contain unique information about the AGN jets, and provide meaningful constraints on the diffuse infrared extragalactic background.

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Observations of T[CLC]e[/CLC]V Gamma-Ray Flares from Markarian 501with the Telescope Array Prototype

Cited by 61 publications

References 8 publications

Optical monitoring of PKS 1510-089: a binary black hole system?

Optical monitoring of PKS 1510-089: a binary black hole system?

On the optimum spacing of stereoscopic imaging atmospheric Cherenkov telescopes

TeV gamma radiation of BL Lac objects Mkn 421 and Mkn 501

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