Search for TeV gamma-rays from Geminga pulsar

Singh, B. B.; Chitnis, V. R.; Bose, D.; Rahman, M. A.; Upadhya, S. S.; Gothe, K. S.; Nagesh, B. K.; Purohit, Prajesh; Rao, S. K.; Rao, Kamesh K.; Sharma, Shubham; Sudersan, P.V.; Venkateshmurthy, B.L.; Vishwanath, P. R.; Acharya, B. S.

doi:10.1016/j.astropartphys.2009.06.007

Cited by 9 publications

(6 citation statements)

References 36 publications

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“…The Geminga pulsar has been a target for ground-based VHE gamma-ray detectors for over two decades. Limits on the pulsed gamma-ray flux in the TeV regime at the ∼10% Crab Nebula level have been reported by the Whipple, HEGRA, and PACT collaborations (Akerlof et al 1993;Aharonian et al 1999;Singh et al 2009), while the Ootacamund, Durham, and Crimean groups have reported weak evidence (∼3σ level) for pulsed emission at the ∼50%-100% Crab Nebula level (Vishwanath et al 1993;Bowden et al 1993;Neshpor et al 2001). Given the far higher sensitivity of current ground-based gamma-ray arrays, it seems likely that these reported excesses are due to statistical fluctuations.…”

Section: Introductionmentioning

confidence: 91%

A SEARCH FOR PULSATIONS FROM GEMINGA ABOVE 100 GeV WITH VERITAS

Aliu

Archambault

Archer

et al. 2015

ApJ

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We present the results of 71.6 hr of observations of the Geminga pulsar (PSR J0633+1746) with the VERITAS veryhigh-energy gamma-ray telescope array. Data taken with VERITAS between 2007 November and 2013 February were phase-folded using a Geminga pulsar timing solution derived from data recorded by the XMM-Newton and Fermi-LAT space telescopes. No significant pulsed emission above 100 GeV is observed, and we report upper limits at the 95% confidence level on the integral flux above 135 GeV (spectral analysis threshold) of 4.0 × 10 −13 s −1 cm −2 and 1.7 × 10 −13 s −1 cm −2 for the two principal peaks in the emission profile. These upper limits, placed in context with phase-resolved spectral energy distributions determined from 5 yr of data from the Fermi-Large Area Telescope (LAT), constrain possible hardening of the Geminga pulsar emission spectra above ∼50 GeV.

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Section: Introductionmentioning

confidence: 91%

A SEARCH FOR PULSATIONS FROM GEMINGA ABOVE 100 GeV WITH VERITAS

Aliu

Archambault

Archer

et al. 2015

ApJ

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“…It was discovered in γ-rays with the SAS-2 experiment [3] before being observed in other wavelengths. Pulsations were first observed in X-rays [4] with ROSAT and later EGRET [5] but have not been observed in the TeV range [6,7,8]. X-ray Multimirror Mission-Newton observations show a pulsar wind around Geminga with an extent of a few arc minutes [9].…”

Section: Introductionmentioning

confidence: 99%

“…The Tibet Air shower array reported an excess of 2.2σ at the location of the pulsar but did not report extended emission [18]. Imaging Atmospheric Cherenkov Telescopes (IACTs) have observed Geminga without significant detection [6,19,7] for over two decades. An extended, hard TeV source is extremely difficult to observe with the IACT technique.…”

Section: Introductionmentioning

confidence: 99%

TeV Gamma-Ray Emission Observed from Geminga with HAWC

Baughman¹,

Wood²

2015

Preprint

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“…Search for TeV γ-rays from Geminga Pulsar was carried out during the six year period spanning 2000-2006 using the PACT [29]. No evidence for pulsed emission of γ-rays was seen in the long stretch of data at a threshold energy of 825 GeV.…”

Section: Pact the Wave-front Sampling Array At Pachmarhimentioning

confidence: 99%

“…were carried out using PACT [28,29]. The PACT result on daily average γ-ray rate per minute is shown for Mrk 421 in Three one-zone SSC models are used to fit X-ray, optical and radio data in each case.…”

Section: Pact the Wave-front Sampling Array At Pachmarhimentioning

confidence: 99%