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8 results on '"Rebillot, P. F."'

1. Multiwavelength Observations of 1ES 1959+650, One Year After the Strong Outburst of 2002

Author

Gutierrez, K., Badran, H. M., Bradbury, S. M., Buckley, J. H., Celik, O., Chow, Y. C., Cogan, P., Cui, W., Daniel, M., Falcone, A., Fegan, S. J., Finley, J. P., Gillanders, G. H., Grube, J., Holder, J., Horan, D., Hughes, S. B., Jung, I., Kieda, D., Kosack, K., Krawczynski, H., Krennrich, F., Lang, M. J., Bohec, S. Le, Maier, G., Moriarty, P., Perkins, J., Pohl, M., Quinn, J., Rebillot, P. F., Rose, H. J., Schroedter, M., Sembroski, G. H., Wakely, S. P., Weekes, T. C., and White, R. J.

Subjects
Astrophysics
Abstract

In April-May 2003, the blazar 1ES 1959+650 showed an increased level of X-ray activity. This prompted a multiwavelength observation campaign with the Whipple 10 m gamma-ray telescope, the Rossi X-ray Timing Explorer, the Bordeaux Optical Observatory, and the University of Michigan Radio Astrophysical Observatory. We present the multiwavelength data taken from May 2, 2003 to June 7, 2003 and compare the source characteristics with those measured during observations taken during the years 2000 and 2002. The X-ray observations gave a data set with high signal-to-noise light curves and energy spectra; however, the gamma-ray observations did not reveal a major TeV gamma-ray flare. Furthermore, we find that the radio and optical fluxes do not show statistically significant deviations from those measured during the 2002 flaring periods. While the X-ray flux and X-ray photon index appear correlated during subsequent observations, the apparent correlation evolved significantly between the years 2000, 2002, and 2003. We discuss the implications of this finding for the mechanism that causes the flaring activity., Comment: 17 pages, 6 figures, 2 tables

Published
2006
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2. TeV Gamma-Ray Observations of the Perseus and Abell 2029 Galaxy Clusters

Author

Perkins, J. S., Badran, H. M., Blaylock, G., Bradbury, S. M., Cogan, P., Chow, Y. C. K., Cui, W., Daniel, M. K., Falcone, A. D., Fegan, S. J., Finley, J. P., Fortin, P., Fortson, L. F., Gillanders, G. H., Gutierrez, K. J., Grube, J., Hall, J., Hanna, D., Holder, J., Horan, D., Hughes, S. B., Kenny, G. E., Kertzman, M., Kieda, D. B., Kildea, J., Kosack, K., Krawczynski, H., Krennrich, F., Lang, M. J., LeBohec, S., Maier, G., Moriarty, P., Ong, R. A., Pohl, M., Ragan, K., Rebillot, P. F., Sembroski, G. H., Steele, D., Swordy, S. P., Valcarcel, L., Vassiliev, V. V., Wakely, S. P., Weekes, T. C., and Williams, D. A.

Subjects
Astrophysics
Abstract

Galaxy clusters might be sources of TeV gamma rays emitted by high-energy protons and electrons accelerated by large scale structure formation shocks, galactic winds, or active galactic nuclei. Furthermore, gamma rays may be produced in dark matter particle annihilation processes at the cluster cores. We report on observations of the galaxy clusters Perseus and Abell 2029 using the 10 m Whipple Cherenkov telescope during the 2003-2004 and 2004-2005 observing seasons. We apply a two-dimensional analysis technique to scrutinize the clusters for TeV emission. In this paper we first determine flux upper limits on TeV gamma-ray emission from point sources within the clusters. Second, we derive upper limits on the extended cluster emission. We subsequently compare the flux upper limits with EGRET upper limits at 100 MeV and theoretical models. Assuming that the gamma-ray surface brightness profile mimics that of the thermal X-ray emission and that the spectrum of cluster cosmic rays extends all the way from thermal energies to multi-TeV energies with a differential spectral index of -2.1, our results imply that the cosmic ray proton energy density is less than 7.9% of the thermal energy density for the Perseus cluster., Comment: Accepted for publication in the Astrophysical Journal

Published
2006
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3. Multiwavelength Observations of 1ES 1959+650, 1 Year after the Strong Outburst of 2002

Author

Gutierrez, K., Badran, H. M., Bradbury, S. M., Buckley, J. H., Celik, O., Chow, Y. C., Cogan, P., Cui, W., Daniel, M., Falcone, A., Fegan, S. J., Finley, J. P., Gillanders, G. H., Grube, J., Holder, J., Horan, D., Hughes, S. B., Jung, I., Kieda, D., Kosack, K., Krawczynski, H., Krennrich, F., Lang, M. J., Le Bohec, S., Maier, G., Moriarty, P., Perkins, J., Pohl, M., Quinn, J., Rebillot, P. F., Rose, H. J., Schroedter, M., Sembroski, G. H., Wakely, S. P., Weekes, T. C., White, R. J., Aller, M., Aller, H., Charlot, P., and Le Campion, J. F.

Subjects
tev gamma-rays, Astrophysics, telescope, 01 natural sciences, 4.85 ghz, spectrum, law.invention, blazar 1es-1959+650, Telescope, Observatory, law, evolution, 0103 physical sciences, strong flares, 010306 general physics, Blazar, mkn 501, variability, radiation, 010303 astronomy & astrophysics, Physics, Astronomy and Astrophysics, Light curve, 13. Climate action, Space and Planetary Science, Flare
Abstract

In April-May 2003, the blazar 1ES 1959+650 showed an increased level of X-ray activity. This prompted a multiwavelength observation campaign with the Whipple 10 m gamma-ray telescope, the Rossi X-ray Timing Explorer, the Bordeaux Optical Observatory, and the University of Michigan Radio Astrophysical Observatory. We present the multiwavelength data taken from May 2, 2003 to June 7, 2003 and compare the source characteristics with those measured during observations taken during the years 2000 and 2002. The X-ray observations gave a data set with high signal-to-noise light curves and energy spectra; however, the gamma-ray observations did not reveal a major TeV gamma-ray flare. Furthermore, we find that the radio and optical fluxes do not show statistically significant deviations from those measured during the 2002 flaring periods. While the X-ray flux and X-ray photon index appear correlated during subsequent observations, the apparent correlation evolved significantly between the years 2000, 2002, and 2003. We discuss the implications of this finding for the mechanism that causes the flaring activity.

Published
2006

4. Multiwavelength observations of the blazar Markarian 421 in 2002 December and 2003 January

Author

Rebillot, P. F., Badran, H. M., Blaylock, G., Bradbury, S. M., Buckley, J. H., Carter-Lewis, D. A., Celik, O., Chow, Y. C., Cogan, P., Cui, W., Daniel, M., Duke, C., Falcone, A., Fegan, S. J., Finley, J. P., Fortson, L. F., Gillanders, G. H., Grube, J., Gutierrez, K., Gyuk, G., Hanna, D., Holder, J., Horan, D., Hughes, S. B., Kenny, G. E., Kertzman, M., Kieda, D., Kildea, J., Kosack, K., Krawczynski, H., Krennrich, F., Lang, M. J., Le Bohec, S., Linton, E., Maier, G., Moriarty, P., Perkins, J., Pohl, M., Quinn, J., Ragan, K., Reynolds, P. T., Rose, H. J., Schroedter, M., Sembroski, G. H., Steele, G., Swordy, S. P., Valcarcel, L., Vassiliev, V. V., Wakely, S. P., Weekes, T. C., Zweerink, J., Aller, M., Aller, H., Boltwood, P., Jung, I., Kranich, D., Nilsson, K., Pasanen, M., Sadun, A., and Sillanpaa, A.

Subjects
bl lacertae objects : individual (mrk 421), galaxies : jets, gamma rays : observations radiation, mechanisms : nonthermal, x-rays : individual (mrk 421), tev gamma-rays, active galactic nuclei, bl-lacertae objects, self-compton model, x-ray, spectral evolution, lac objects, strong flares, crab-nebula, mkn 501, Astrophysics::High Energy Astrophysical Phenomena
Abstract

We report on a multiwavelength campaign on the TeV gamma-ray blazar Mrk 421 performed during 2002 December and 2003 January. These target of opportunity observations were initiated by the detection of X-ray and TeV gamma-ray flares with the All Sky Monitor (ASM) on board the Rossi X-Ray Timing Explorer (RXTE) and the 10 m Whipple gamma-ray telescope. The campaign included observational coverage in the radio (University of Michigan Radio Astronomy Observatory), optical (Boltwood, La Palma KVA 0.6 m; WIYN 0.9 m), X-ray (RXTE pointed telescopes), and TeV gamma-ray (Whipple and HEGRA) bands. At TeV energies, the observations revealed several flares at intermediate flux levels, peaking between 1 and 1.5 times the flux from the Crab Nebula. While the time-averaged spectrum can be fitted with a single power law of photon index Gamma = 2.8 from dN gamma/dE proportional to E-Gamma, we find some evidence for spectral variability. Confirming earlier results, the campaign reveals a rather loose correlation between the X-ray and TeV gamma-ray fluxes. In one case, a very strong X-ray flare is not accompanied by a comparable TeV gamma-ray flare. Although the source flux was variable in the optical and radio bands, the sparse sampling of the optical and radio light curves does not allow us to study the correlation properties in detail. We present a simple analysis of the data with a synchrotron self-Compton model, emphasizing that models with very high Doppler factors and low magnetic fields can describe the data.

Published
2006

5. The Whipple Observatory 10 m gamma-ray telescope, 1997-2006

Author

Kildea, J., Atkins, R. W., Badran, H. M., Blaylock, G., Bond, I. H., Bradbury, S. M., Buckley, J. H., Carter-Lewis, D. A., Celik, O., Chow, Y. C. K., Cui, W., Cogan, P., Daniel, M. K., Perez, I. D., Dowdall, C., Duke, C., Falcone, A. D., Fegan, D. J., Fegan, S. J., Finley, J. P., Fortson, L. F., Gall, D., Gillanders, G. H., Grube, J., Gutierrez, K. J., Hall, J., Hall, T. A., Holder, J., Horan, D., Hughes, S. B., Jordan, M., Jung, I., Kenny, G. E., Kertzman, M., Knapp, J., Konopelko, A., Kosack, K., Krawczynski, H., Krennrich, F., Lang, M. J., LeBohec, S., Lloyd-Evans, J., Millis, J., Moriarty, P., Nagai, T., Ogden, P. A., Ong, R. A., Perkins, J. S., Petry, D., Pizlo, F., Pohl, M., Quinn, J., Quinn, M., Rebillot, P. F., Rose, H. J., Schroedter, M., Sembroski, G. H., Smith, A. W., Syson, A., Toner, J. A., Valcarcel, L., Vassiliev, V. V., Wakely, S. P., Weekes, T. C., White, R. J., Kildea, J., Atkins, R. W., Badran, H. M., Blaylock, G., Bond, I. H., Bradbury, S. M., Buckley, J. H., Carter-Lewis, D. A., Celik, O., Chow, Y. C. K., Cui, W., Cogan, P., Daniel, M. K., Perez, I. D., Dowdall, C., Duke, C., Falcone, A. D., Fegan, D. J., Fegan, S. J., Finley, J. P., Fortson, L. F., Gall, D., Gillanders, G. H., Grube, J., Gutierrez, K. J., Hall, J., Hall, T. A., Holder, J., Horan, D., Hughes, S. B., Jordan, M., Jung, I., Kenny, G. E., Kertzman, M., Knapp, J., Konopelko, A., Kosack, K., Krawczynski, H., Krennrich, F., Lang, M. J., LeBohec, S., Lloyd-Evans, J., Millis, J., Moriarty, P., Nagai, T., Ogden, P. A., Ong, R. A., Perkins, J. S., Petry, D., Pizlo, F., Pohl, M., Quinn, J., Quinn, M., Rebillot, P. F., Rose, H. J., Schroedter, M., Sembroski, G. H., Smith, A. W., Syson, A., Toner, J. A., Valcarcel, L., Vassiliev, V. V., Wakely, S. P., Weekes, T. C., and White, R. J.

Abstract

Details are presented of the Whipple Observatory's 10 m atmospheric Cherenkov telescope and camera, as it evolved during the period 1997 until 2006. The design of the telescope and camera's optical and electronic systems is discussed together with a detailed description of the four-stage GRANITE (Gamma-RAy New Imaging TElescope) upgrade program, undertaken during the same time period. The objective of the upgrade was to improve the telescope's sensitivity for the detection of very-high-energy gamma-rays. Results from the program are provided and are briefly discussed in the context of the design of VERITAS. (C) 2007 Elsevier B.V. All rights reserved.

Published
2007

6. A new search for primordial black hole evaporations using the Whipple gamma-ray telescope

Author

Linton, E. T., Atkins, R. W., Badran, H. M., Blaylock, G., Boyle, P. J., Buckley, J. H., Byrum, K. L., Carter-Lewis, D. A., Celik, O., Chow, Y. C. K., Cogan, P., Daniel, M. K., Dowdall, C., Falcone, A. D., Fegan, D. J., Fegan, S. J., Finley, J. P., Fortin, P., Guiterrez, K. J., Hall, J., Hanna, D., Holder, J., Horan, D., Hughes, S. B., Humensky, T. B., Jung, I., Kenny, G. E., Kertzman, M., Kieda, D. B., Kildea, J., Knapp, J., Krawczynski, H., Lang, M. J., LeBohec, S., Maier, G., Moriarty, P., Ong, R. A., Perkins, J. S., Pizlo, F., Pohl, M., Quinn, J., Ragan, K., Rebillot, P. F., Reynolds, P. T., Sembroski, G. H., Steele, D., Swordy, S. P., Valcarcel, L., Wakely, S. P., Weekes, T. C., White, R. J., Linton, E. T., Atkins, R. W., Badran, H. M., Blaylock, G., Boyle, P. J., Buckley, J. H., Byrum, K. L., Carter-Lewis, D. A., Celik, O., Chow, Y. C. K., Cogan, P., Daniel, M. K., Dowdall, C., Falcone, A. D., Fegan, D. J., Fegan, S. J., Finley, J. P., Fortin, P., Guiterrez, K. J., Hall, J., Hanna, D., Holder, J., Horan, D., Hughes, S. B., Humensky, T. B., Jung, I., Kenny, G. E., Kertzman, M., Kieda, D. B., Kildea, J., Knapp, J., Krawczynski, H., Lang, M. J., LeBohec, S., Maier, G., Moriarty, P., Ong, R. A., Perkins, J. S., Pizlo, F., Pohl, M., Quinn, J., Ragan, K., Rebillot, P. F., Reynolds, P. T., Sembroski, G. H., Steele, D., Swordy, S. P., Valcarcel, L., Wakely, S. P., Weekes, T. C., and White, R. J.

Abstract

Stephen Hawking's prediction that black holes should radiate like black bodies has several important consequences, including the possibility of the detection of small (similar to 10(15) g) black holes created in the very early universe. The detection of such primordial black holes ( PBHs) would be an important discovery, not only confirming Hawking's theory, but also providing valuable insights into the history of the early universe. A search through 5.5 years of archival data from the Whipple Atmospheric Cerenkov Telescope is made for TeV gamma-ray bursts on 1, 3, and 5 s timescales. On the basis of a null result from this direct search for PBH evaporations, an upper limit of 1.08 x 10(6) pc(-3) yr(-1) (99% CL) is set on the PBH evaporation rate in the local region of the galaxy, assuming the Standard Model of particle physics. This is more than a factor of two better than the previous limit at this energy range and includes longer timescales than have previously been explored. Comparison of this result with previous limits on the fraction of the critical density comprised by PBHs, Omega(pbh), depends strongly on assumptions made about PBH clustering; in models predicting strong PBH clustering, the limit in this work could be as many as ten orders of magnitude more stringently than those set by diffuse MeV gamma-ray observations.

Published
2006

7. Multiwavelength Observations of the Blazar Markarian 421 in 2002 December and 2003 January

Author

Rebillot, P. F., primary, Badran, H. M., additional, Blaylock, G., additional, Bradbury, S. M., additional, Buckley, J. H., additional, Carter‐Lewis, D. A., additional, Celik, O., additional, Chow, Y. C., additional, Cogan, P., additional, Cui, W., additional, Daniel, M., additional, Duke, C., additional, Falcone, A., additional, Fegan, S. J., additional, Finley, J. P., additional, Fortson, L. F., additional, Gillanders, G. H., additional, Grube, J., additional, Gutierrez, K., additional, Gyuk, G., additional, Hanna, D., additional, Holder, J., additional, Horan, D., additional, Hughes, S. B., additional, Kenny, G. E., additional, Kertzman, M., additional, Kieda, D., additional, Kildea, J., additional, Kosack, K., additional, Krawczynski, H., additional, Krennrich, F., additional, Lang, M. J., additional, Le Bohec, S., additional, Linton, E., additional, Maier, G., additional, Moriarty, P., additional, Perkins, J., additional, Pohl, M., additional, Quinn, J., additional, Ragan, K., additional, Reynolds, P. T., additional, Rose, H. J., additional, Schroedter, M., additional, Sembroski, G. H., additional, Steele, G., additional, Swordy, S. P., additional, Valcarcel, L., additional, Vassiliev, V. V., additional, Wakely, S. P., additional, Weekes, T. C., additional, Zweerink, J., additional, VERITAS Collaboration), (The, additional, Aller, M., additional, Aller, H., additional, Boltwood, P., additional, Jung, I., additional, Kranich, D., additional, Nilsson, K., additional, Pasanen, M., additional, Sadun, A., additional, and Sillanpaa, A., additional

Published
2006
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8. A new search for primordial black hole evaporations using the Whipple gamma-ray telescope

Author

Linton, E T, primary, Atkins, R W, additional, Badran, H M, additional, Blaylock, G, additional, Boyle, P J, additional, Buckley, J H, additional, Byrum, K L, additional, Carter-Lewis, D A, additional, Celik, O, additional, Chow, Y C K, additional, Cogan, P, additional, Daniel, M K, additional, Dowdall, C, additional, Falcone, A D, additional, Fegan, D J, additional, Fegan, S J, additional, Finley, J P, additional, Fortin, P, additional, Guiterrez, K J, additional, Hall, J, additional, Hanna, D, additional, Holder, J, additional, Horan, D, additional, Hughes, S B, additional, Humensky, T B, additional, Jung, I, additional, Kenny, G E, additional, Kertzman, M, additional, Kieda, D B, additional, Kildea, J, additional, Knapp, J, additional, Krawczynski, H, additional, Lang, M J, additional, LeBohec, S, additional, Maier, G, additional, Moriarty, P, additional, Ong, R A, additional, Perkins, J S, additional, Pizlo, F, additional, Pohl, M, additional, Quinn, J, additional, Ragan, K, additional, Rebillot, P F, additional, Reynolds, P T, additional, Sembroski, G H, additional, Steele, D, additional, Swordy, S P, additional, Valcarcel, L, additional, Wakely, S P, additional, Weekes, T C, additional, and White, R J, additional

Published
2006
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