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8 results on '"P. Rebillot"'

1. A Survey of Unidentified EGRET Sources at Very High Energies

Author

J. McEnery, A. M. Hillas, O. Celik, J. H. Buckley, C. Duke, J. Grube, A. Syson, Dietrich Müller, David Kieda, J. Lloyd-Evans, A. Jarvis, J. Hall, K. Ragan, Reshmi Mukherjee, K. Kosack, P. Moriarty, F. Krennrich, V. V. Vassiliev, M. K. Daniel, G. H. Sembroski, J. Knapp, Wei Cui, B. Power-Mooney, D. J. Fegan, S. P. Swordy, Jamie Holder, I. de la Calle Perez, P. T. Reynolds, S. P. Wakely, G. Walker, S. J. Fegan, R. A. Ong, S. Le Bohec, G. E. Kenny, I. H. Bond, M. Schroedter, J. P. Finley, R. Pallassini, T. C. Weekes, Lucy Fortson, M. Jordan, M. Catanese, D. Petry, John Kildea, D. S. Hanna, P. Rebillot, P. J. Boyle, E. Linton, Henric Krawczynski, D. A. Carter-Lewis, H. M. Badran, M. D'Vali, Tony Hall, Mark N. Quinn, M. J. Lang, J. A. Gaidos, S. J. Nolan, A. Milovanovic, R. W. Lessard, Jeffrey Zweerink, H. J. Rose, S. M. Bradbury, Abraham D. Falcone, M. Kertzman, D. Horan, John L. Quinn, K. G. Gibbs, S. Gammell, T. N. Nagai, and G. H. Gillanders

Subjects
tev energies, Astrophysics::High Energy Astrophysical Phenomena, sax j0635+0533, Flux, error box, Astrophysics, galactic plane, law.invention, Telescope, surveys, supernova-remnants, galaxies : jets, gamma rays : observations, gamma-ray sources, source 3eg j2227+6122, x-ray, ls i+61-degrees-303, galaxy clusters, Observatory, law, Egret, Astrophysics::Galaxy Astrophysics, Galaxy cluster, Physics, biology, Astronomy, Astronomy and Astrophysics, Galactic plane, biology.organism_classification, Galaxy, Space and Planetary Science
Abstract

The Whipple Observatory 10 m γ-ray telescope has been used to survey the error boxes of EGRET unidentified sources in an attempt to find counterparts at energies of 350 GeV and above. Twenty-one unidentified sources detected by EGRET (more than 10% of the total number) have been included in this survey. In no case is a statistically significant signal found in the EGRET error box, which implies that, at least for this sample, the γ-ray spectra of these sources steepen between 100 MeV and 350 GeV. For each EGRET source location, we list candidate associations and derive upper limits on the integral γ-ray flux above 350 GeV.

Published
2005
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2. Spectrum of Very High Energy Gamma‐Rays from the blazar 1ES 1959+650 during Flaring Activity in 2002

Author

M. K. Daniel, H. M. Badran, I. H. Bond, P. J. Boyle, S. M. Bradbury, J. H. Buckley, D. A. Carter‐Lewis, M. Catanese, O. Celik, P. Cogan, W. Cui, M. D’Vali, I. de la Calle Perez, C. Duke, A. Falcone, D. J. Fegan, S. J. Fegan, J. P. Finley, L. F. Fortson, J. A. Gaidos, S. Gammell, K. Gibbs, G. H. Gillanders, J. Grube, J. Hall, T. A. Hall, D. Hanna, A. M. Hillas, J. Holder, D. Horan, T. B. Humensky, A. Jarvis, M. Jordan, G. E. Kenny, M. Kertzman, D. Kieda, J. Kildea, J. Knapp, K. Kosack, H. Krawczynski, F. Krennrich, M. J. Lang, S. Le Bohec, E. Linton, J. Lloyd‐Evans, A. Milovanovic, P. Moriarty, D. Muller, T. Nagai, S. Nolan, R. A. Ong, R. Pallassini, D. Petry, B. Power‐Mooney, J. Quinn, M. Quinn, K. Ragan, P. Rebillot, P. T. Reynolds, H. J. Rose, M. Schroedter, G. H. Sembroski, S. P. Swordy, A. Syson, V. V. Vassiliev, S. P. Wakely, G. Walker, T. C. Weekes, and J. Zweerink

Subjects
tev energies, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics, system, techniques : spectroscopic, law.invention, Telescope, project, law, Coincident, bl lacertae objects : individual (1es 1959+650), gamma rays : observations, strong flares, Blazar, Cherenkov radiation, Physics, Spectral index, Range (particle radiation), Astrophysics (astro-ph), Gamma ray, h1426+428, Astronomy and Astrophysics, calibration, radiation, Space and Planetary Science, cherenkov telescopes, markarian-421, High Energy Physics::Experiment, Flare
Abstract

The blazar 1ES 1959+650 was observed in a flaring state with the Whipple 10 m Imaging Atmospheric Cherenkov Telescope during May of 2002. A spectral analysis has been carried out on the data from that time period and the resulting very high energy gamma-ray spectrum ($E \geq 316$ GeV) can be well fit by a power-law of differential spectral index \alpha = 2.78 +/- 0.12_{stat.} +/- 0.21_{sys.}. On June 4th 2002, the source flared dramatically in the gamma-ray range without any coincident increase in the X-ray emission, providing the first unambiguous example of an `orphan' gamma-ray flare from a blazar. The gamma-ray spectrum for these data can also be described by a simple power-law fit with \alpha = 2.82 +/- 0.15_{stat.} +/- 0.30_{sys.}. There is no compelling evidence for spectral variability, or for any cut-off to the spectrum., Comment: 25 pages. Collaboration website at http://veritas.sao.arizona.edu/

Published
2005
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3. VERITAS: the Very Energetic Radiation Imaging Telescope Array System

Author

M. K. Daniel, S. P. Wakely, G. Walker, John Kildea, J. H. Buckley, David Kieda, Mark N. Quinn, A. Jarvis, S. M. Bradbury, S. P. Swordy, A. Milovanovic, Wei Cui, A. Syson, D. Horan, F. Krennrich, M. Schroedter, V. V. Vassiliev, Abraham D. Falcone, G. E. Kenny, H. J. Rose, R. Pallassini, Lucy Fortson, P. J. Boyle, E. Linton, D. S. Hanna, J. A. Gaidos, M. D'Vali, P. Moriarty, S. J. Nolan, M. Jordan, Jeffrey Zweerink, J. Hall, K. Ragan, Tony Hall, J. Knapp, K. Kosack, D. A. Carter-Lewis, D. Petry, J. Lloyd-Evans, Dietrich Müller, G. H. Gillanders, B. Power-Mooney, G. H. Sembroski, Jamie Holder, S. LeBohec, I. de la Calle Perez, I. H. Bond, M. J. Lang, S. J. Fegan, Henric Krawczynski, M. Kertzman, T. N. Nagai, J. Grube, P. Rebillot, P. T. Reynolds, J. P. Finley, C. Duke, T. C. Weekes, D. J. Fegan, John L. Quinn, K. G. Gibbs, R. A. Ong, S. Gammell, A. M. Hillas, and O. Celik

Subjects
Physics, tev energies, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, Astronomy and Astrophysics, Gamma-ray astronomy, Astrophysics, First light, Cherenkov Telescope Array, law.invention, Telescope, Primary mirror, Space and Planetary Science, law, Observatory, gamma-ray astronomy, atmospheric cherenkov detectors, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Galaxy Astrophysics, Very Energetic, Cherenkov radiation
Abstract

The Very Energetic Radiation Imaging Telescope Array System (VERITAS) is the major next generation imaging atmospheric Cherenkov γ-ray telescope in the western hemisphere and will be located in southern Arizona nearby Kitt Peak National Observatory. The VERITAS observatory will provide unprecedented sensitivity to photon energies between 50 GeV and 50 TeV. The first stage is an array of four telescopes to be fully operational in early 2006, with an expansion to seven telescopes envisioned for 2008. The construction of a prototype telescope is underway, for which first light is expected in Fall 2003. The technical concept is outlined and a progress report is given.

Published
2004
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4. Observation of m87 at 400 gev with the whipple 10 meter telescope

Author

J. Grube, A. Milovanovic, M. J. Lang, F. Krennrich, R. Pallassini, Lucy Fortson, R. A. Ong, I. de la Calle Perez, D. Horan, M. Jordan, M. D'Vali, D. A. Carter-Lewis, V. V. Vassiliev, M. Catanese, M. Kertzman, Jeffrey Zweerink, P. Rebillot, D. J. Fegan, Abraham D. Falcone, J. Hall, B. Power-Mooney, S. M. Bradbury, D. Petry, J. Lloyd-Evans, Dietrich Müller, Jamie Holder, E. Linton, A. Syson, K. Kosack, G. H. Sembroski, H. J. Rose, H. Krawczynski, J. H. Buckley, A. Jarvis, John L. Quinn, S. P. Swordy, P. Moriarty, K. Ragan, I. H. Bond, K. G. Gibbs, M. K. Daniel, S. Gammell, S. J. Fegan, M. Schroedter, S. P. Wakely, G. Walker, G. E. Kenny, S. Le Bohec, J. A. Gaidos, S. J. Nolan, David Kieda, P. T. Reynolds, T. N. Nagai, C. Duke, G. H. Gillanders, J. Knapp, A. M. Hillas, O. Celik, P. J. Boyle, H. M. Badran, Tony Hall, D. S. Hanna, J. P. Finley, T. C. Weekes, Mark N. Quinn, Wei Cui, and John Kildea

Subjects
High energy, tev gamma-rays, Radio galaxy, Astrophysics::High Energy Astrophysical Phenomena, galaxies : active, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, high-resolution, Power law, law.invention, spectrum, Telescope, galaxies : individual (m87), law, jet, emission, gamma rays : observations, lac object, galaxy m-87, Physics, bl-lacertae object, polarization, HEGRA, Astronomy, Astronomy and Astrophysics, Confidence interval, Differential spectrum, radio, Space and Planetary Science, BL Lac object
Abstract

We present results from observations taken with the Whipple 10 m very high energy gamma-ray telescope with maximal sensitivity at 400 GeV during 39 hr between 2000 and 2003 in the direction of the giant radio galaxy M87. Using the entire data set, we derive a 99% confidence level upper limit on the flux of gamma-ray emission above 400 GeV from M87 to be less than or equal to 6: 9; 10(-1)2 cm(-2) s(-1). This suggests variability at the 90% confidence level when compared to the flux measured by the HEGRA collaboration in 1999 if the differential spectrum is steeper than a power law of index 3.75. Our search for a correlation between the Rossi X-Ray Timing Explorer all-sky monitor observation and a potential gamma-ray signal is inconclusive.

Published
2004

5. Constraints on the very high energy emission from BL Lacertae objects

Author

D. Horan, H. M. Badran, I. H. Bond, P. J. Boyle, S. M. Bradbury, J. H. Buckley, D. A. Carter‐Lewis, M. Catanese, O. Celik, W. Cui, M. Daniel, M. D’Vali, I. de la Calle Perez, C. Duke, A. Falcone, D. J. Fegan, S. J. Fegan, J. P. Finley, L. F. Fortson, J. A. Gaidos, S. Gammell, K. Gibbs, G. H. Gillanders, J. Grube, J. Hall, T. A. Hall, D. Hanna, A. M. Hillas, J. Holder, A. Jarvis, M. Jordan, G. E. Kenny, M. Kertzman, D. Kieda, J. Kildea, J. Knapp, K. Kosack, H. Krawczynski, F. Krennrich, M. J. Lang, S. Le Bohec, E. Linton, J. Lloyd‐Evans, A. Milovanovic, P. Moriarty, D. Muller, T. Nagai, S. Nolan, R. A. Ong, R. Pallassini, D. Petry, B. Power‐Mooney, J. Quinn, M. Quinn, K. Ragan, P. Rebillot, P. T. Reynolds, H. J. Rose, M. Schroedter, G. H. Sembroski, S. P. Swordy, A. Syson, V. V. Vassiliev, S. P. Wakely, G. Walker, T. C. Weekes, and J. Zweerink

Subjects
High energy, Astrophysics::High Energy Astrophysical Phenomena, blazars, Flux, FOS: Physical sciences, Astrophysics, law.invention, Telescope, Observatory, law, jet, Egret, gamma rays : observations, Physics, search, markarian 501, model, biology, bl lacertae objects : general, Astrophysics (astro-ph), Gamma ray, Astronomy and Astrophysics, biology.organism_classification, gamma-ray emission, lac objects, sample, Redshift, galaxies : jets, active galactic nuclei, x-ray, Space and Planetary Science
Abstract

We present results from observations of 29 BL Lacertae objects, taken with the Whipple Observatory 10 m Gamma-Ray Telescope between 1995 and 2000. The observed objects are mostly at low redshift (z < 0.2) but observations of objects of z up to 0.444 are also reported. Five of the objects are EGRET sources and two are unconfirmed TeV sources. Three of the confirmed sources of extragalactic TeV gamma rays were originally observed as part of this survey and have been reported elsewhere. No significant excesses are detected from any of the other objects observed, on time scales of days, months or years. We report 99.9% confidence level flux upper limits for the objects for each observing season. The flux upper limits are typically 20% of the Crab flux although, for some sources, limits as sensitive as 6% of the Crab flux were derived. The results are consistent with the synchrotron-self-Compton (SSC) model predictions considered in this work., 30 pages, 9 Tables, 3 Figures, accepted for publication in the Astrophysical Journal, 1 March 2003 edition Version 2 contains four corrections to the flux units (Tables 5, 6, 7 and 9) and two corrections to upper limits in the flux units column for H1426+428 in Table 6

Published
2004

6. Tev Gamma-ray observations of the galactic center

Author

K. Kosack, H. M. Badran, I. H. Bond, P. J. Boyle, S. M. Bradbury, J. H. Buckley, D. A. Carter-Lewis, O. Celik, V. Connaughton, W. Cui, M. Daniel, M. D'Vali, I. de la Calle Perez, C. Duke, A. Falcone, D. J. Fegan, S. J. Fegan, J. P. Finley, L. F. Fortson, J. A. Gaidos, S. Gammell, K. Gibbs, G. H. Gillanders, J. Grube, K. Gutierrez, J. Hall, T. A. Hall, D. Hanna, A. M. Hillas, J. Holder, D. Horan, A. Jarvis, M. Jordan, G. E. Kenny, M. Kertzman, D. Kieda, J. Kildea, J. Knapp, H. Krawczynski, F. Krennrich, M. J. Lang, S. Le Bohec, E. Linton, J. Lloyd-Evans, A. Milovanovic, J. McEnery, P. Moriarty, D. Muller, T. Nagai, S. Nolan, R. A. Ong, R. Pallassini, D. Petry, B. Power-Mooney, J. Quinn, M. Quinn, K. Ragan, P. Rebillot, P. T. Reynolds, H. J. Rose, M. Schroedter, G. H. Sembroski, S. P. Swordy, A. Syson, V. V. Vassiliev, S. P. Wakely, G. Walker, T. C. Weekes, and J. Zweerink

Subjects
spectra, Point source, direction, Astrophysics::High Energy Astrophysical Phenomena, east, FOS: Physical sciences, Flux, Astrophysics, dark matter, Standard deviation, law.invention, Telescope, law, dark-matter halos, emission, gamma rays : observations, sagittarius-a-asterisk, flare, milky-way, Astrophysics::Galaxy Astrophysics, Confidence region, Physics, Astrophysics (astro-ph), Galactic Center, Gamma ray, Astronomy and Astrophysics, galaxy : nucleus, galaxy : center, Crab Nebula, supermassive black-hole, annihilation, Space and Planetary Science
Abstract

We report a possible detection of TeV gamma rays from the Galactic center by the Whipple 10 m gamma-ray telescope. Twenty-six hours of data were taken over an extended period from 1995 through 2003 resulting in a total significance of 3.7 sigma. The measured excess corresponds to an integral flux of 1.6 x 10(-8) +/- 0.5 x 10(-8) (stat) +/- 0.3 x 10(-8) (sys) photons m(-2) s(-1) above an energy of 2.8 TeV, roughly 40% of the flux from the Crab Nebula at this energy. The 95% confidence region has an angular extent of about 15' and includes the position of Sgr A*. The detection is consistent with a point source and shows no evidence of variability.

Published
2004

7. Search for High Energy Gamma Rays from an X-ray Selected Blazar Sample

Author

I. de la Calle Perez, I. H. Bond, P. J. Boyle, S. M. Bradbury, J. H. Buckley, D. A. Carter‐Lewis, O. Celik, W. Cui, C. Dowdall, C. Duke, A. Falcone, D. J. Fegan, S. J. Fegan, J. P. Finley, L. Fortson, J. A. Gaidos, K. Gibbs, S. Gammell, J. Hall, T. A. Hall, A. M. Hillas, J. Holder, D. Horan, M. Jordan, M. Kertzman, D. Kieda, J. Kildea, J. Knapp, K. Kosack, H. Krawczynski, F. Krennrich, S. LeBohec, E. T. Linton, J. Lloyd‐Evans, P. Moriarty, D. Muller, T. N. Nagai, R. A. Ong, M. Page, R. Pallassini, D. Petry, B. Power‐Mooney, J. Quinn, P. Rebillot, P. T. Reynolds, H. J. Rose, M. Schroedter, G. H. Sembroski, S. P. Swordy, V. V. Vassiliev, S. P. Wakely, G. Walker, and T. C. Weekes

Subjects
High energy, tev energies, Astrophysics::High Energy Astrophysical Phenomena, Flux, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, telescope, law.invention, Telescope, bl lacertae objects, law, emission, gamma rays : observations, flare, Blazar, bl lacertae objects : individual (rgb j0214+517, rgb j1117+202, rgb j1725+118, ies 0033+595, 1es 0120+340, Physics, Spectral properties, Astrophysics (astro-ph), X-ray, Gamma ray, Astronomy and Astrophysics, Sample (graphics), radiation, 1es 0229+200, 1es 0806+524, 1es 1426+428, 1es 1553+113, 1es 1959+650), Space and Planetary Science, markarian-501, active galactic nuclei, absorption, discovery
Abstract

Our understanding of blazars has been greatly increased in recent years by extensive multi-wavelength observations, particularly in the radio, X-ray and gamma-ray regions. Over the past decade the Whipple 10m telescope has contributed to this with the detection of 5 BL Lacertae objects at very high gamma-ray energies. The combination of multi-wavelength data has shown that blazars follow a well-defined sequence in terms of their broadband spectral properties. Together with providing constraints on emission models, this information has yielded a means by which potential sources of TeV emission may be identified and predictions made as to their possible gamma-ray flux. We have used the Whipple telescope to search for TeV gamma-ray emission from eight objects selected from a list of such candidates. No evidence has been found for VHE emission from the objects in our sample, and upper limits have been derived for the mean gamma-ray flux above 390GeV. These flux upper limits are compared with the model predictions and the implications of our results for future observations are discussed., 15 pages, 2 figures, Accepted for publication in ApJ

Published
2003

8. Detection of t[clc]e[/clc]v gamma rays from the bl lacertae object 1es 1959+650 with the whipple 10 meter telescope

Author

J. Holder, I. H. Bond, P. J. Boyle, S. M. Bradbury, J. H. Buckley, D. A. Carter-Lewis, W. Cui, C. Dowdall, C. Duke, I. de la Calle Perez, A. Falcone, D. J. Fegan, S. J. Fegan, J. P. Finley, L. Fortson, J. A. Gaidos, K. Gibbs, S. Gammell, J. Hall, T. A. Hall, A. M. Hillas, D. Horan, M. Jordan, M. Kertzman, D. Kieda, J. Kildea, J. Knapp, K. Kosack, H. Krawczynski, F. Krennrich, S. LeBohec, E. T. Linton, J. Lloyd-Evans, P. Moriarty, D. Müller, T. N. Nagai, R. Ong, M. Page, R. Pallassini, D. Petry, B. Power-Mooney, J. Quinn, P. Rebillot, P. T. Reynolds, H. J. Rose, M. Schroedter, G. H. Sembroski, S. P. Swordy, V. V. Vassiliev, S. P. Wakely, G. Walker, and T. C. Weekes

Subjects
Physics, High energy, mkn-501, active galaxy markarian-421, blazars, Gamma ray, Flux, Astronomy and Astrophysics, Astrophysics, system, energy-spectrum, law.invention, Telescope, radiation, Crab Nebula, x-ray, Space and Planetary Science, law, bl lacertae objects : individual (1es 1959+650), photons, gamma rays : observations, Imaging technique, strong flares, Cherenkov radiation, BL Lac object
Abstract

We present the first strong detection of very high energy gamma-rays from the close (z=0.048) X-ray selected BL Lacertae object 1ES1959+650. Observations were made with the Whipple 10m telescope on Mt. Hopkins, Arizona, using the atmospheric Cherenkov imaging technique. The flux between May and July 2002 was highly variable, with a mean of 0.64 +/- 0.03 times the steady flux from the Crab Nebula and reaching a maximum of five Crab, with variability on timescales as short as seven hours.

Published
2003

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