Now showing items 1-16 of 16

    • A search for tev gamma‐ray emission from high‐peaked flat‐spectrum radio quasars using the whipple air cerenkov telescope 

      Falcone, A. D.; Bond, I. H.; Boyle, P. J.; Bradbury, S. M.; Buckley, J. H.; Carter‐Lewis, D.; Celik, O.; Cui, W.; Daniel, M.; D’Vali, M.; de la Calle Perez, I.; Duke, C.; Fegan, D. J.; Fegan, S. J.; Finley, J. P.; Fortson, L. F.; Gaidos, J.; Gammell, S.; Gibbs, K.; Gillanders, G. H.; Grube, J.; Hall, J.; Hall, T. A.; Hanna, D.; Hillas, A. M.; Holder, J.; Horan, D.; Jarvis, A.; Kenny, G. E.; Kertzman, M.; Kieda, D.; Kildea, J.; Knapp, J.; Kosack, K.; Krawczynski, H.; Krennrich, F.; Lang, M. J.; LeBohec, S.; Linton, E.; Lloyd‐Evans, J.; Milovanovic, A.; Moriarty, P.; Muller, D.; Nagai, T.; Nolan, S.; Ong, R.; Pallassini, R.; Petry, D.; Pizlo, F.; Power‐Mooney, B.; Quinn, J.; Quinn, M.; Ragan, K.; Rebillot, P.; Reynolds, P. T.; Rose, H. J.; Schroedter, M.; Sembroski, G.; Swordy, S. P.; Syson, A.; Tyler, K.; Vassiliev, V. V.; Wakely, S. P.; Walker, G.; Weekes, T. C.; Zweerink, J. (IOP Publishing, 2004-10-01)
      Blazars have traditionally been separated into two broad categories based on their optical emission characteristics. Blazars with faint or no emission lines are referred to as BL Lacertae objects ( BL Lacs), and blazars ...
    • A search for the optical counterpart to psr b1821-24 in m 28 

      Golden, A.; Butler, R. F.; Shearer, A. (EDP Sciences, 2001-05-01)
      We have analysed archival HST/WFPC2 images in both the F555W & F814W bands of the core field of the globular cluster M 28 in an attempt to identify the optical counterpart of the magnetospherically active millisecond pulsar ...
    • Detection of new optical counterpart candidates to psr b1951+32 with hst/wfpc2 

      Butler, R. F.; Golden, A.; Shearer, A. (EDP Sciences, 2002-11-18)
      There remain several definitive gamma-ray pulsars that are as yet undetected in the optical regime. A classic case is the pulsar PSR B1951+32, associated with the complex CTB 80 SNR. Previous ground based high speed 2-d ...
    • Detection of t[clc]e[/clc]v gamma rays from the bl lacertae object 1es 1959+650 with the whipple 10 meter telescope 

      Holder, J.; Bond, I. H.; Boyle, P. J.; Bradbury, S. M.; Buckley, J. H.; Carter-Lewis, D. A.; Cui, W.; Dowdall, C.; Duke, C.; de la Calle Perez, I.; Falcone, A.; Fegan, D. J.; Fegan, S. J.; Finley, J. P.; Fortson, L.; Gaidos, J. A.; Gibbs, K.; Gammell, S.; Hall, J.; Hall, T. A.; Hillas, A. M.; Horan, D.; Jordan, M.; Kertzman, M.; Kieda, D.; Kildea, J.; Knapp, J.; Kosack, K.; Krawczynski, H.; Krennrich, F.; LeBohec, S.; Linton, E. T.; Lloyd-Evans, J.; Moriarty, P.; Müller, D.; Nagai, T. N.; Ong, R.; Page, M.; Pallassini, R.; Petry, D.; Power-Mooney, B.; Quinn, J.; Rebillot, P.; Reynolds, P. T.; Rose, H. J.; Schroedter, M.; Sembroski, G. H.; Swordy, S. P.; Vassiliev, V. V.; Wakely, S. P.; Walker, G.; Weekes, T. C. (IOP Publishing, 2003-01-20)
      We present the first strong detection of very high energy gamma-rays from the close (z=0.048) X-ray-selected BL Lacertae object 1ES 1959+650. Observations were made with the Whipple 10 m telescope on Mount Hopkins, Arizona, ...
    • Enhanced optical emission during crab giant radio pulses 

      Shearer, A. (American Association for the Advancement of Science (AAAS), 2003-07-25)
      We detected a correlation between optical and giant radio pulse emission from the Crab pulsar. Optical pulses coincident with the giant radio pulses were on average 3% brighter than those coincident with normal radio pulses. ...
    • Measurement of the multi‐tev gamma‐ray flare spectra of markarian 421 and markarian 501 

      Krennrich, F.; Biller, S. D.; Bond, I. H.; Boyle, P. J.; Bradbury, S. M.; Breslin, A. C.; Buckley, J. H.; Burdett, A. M.; Gordo, J. Bussons; Carter‐Lewis, D. A.; Catanese, M.; Cawley, M. F.; Fegan, D. J.; Finley, J. P.; Gaidos, J. A.; Hall, T.; Hillas, A. M.; Lamb, R. C.; Lessard, R. W.; Masterson, C.; McEnery, J. E.; Mohanty, G.; Moriarty, P.; Quinn, J.; Rodgers, A. J.; Rose, H. J.; Samuelson, F. W.; Sembroski, G. H.; Srinivasan, R.; Vassiliev, V. V.; Weekes, T. C. (IOP Publishing, 1999-01-20)
      The energy spectrum of Markarian 421 in flaring states has been measured from 0.3 to 10 TeV using both small and large zenith angle observations with the Whipple Observatory 10 m imaging telescope. The large zenith angle ...
    • Multiwavelength observations of 1es 1959+650, 1 year after the strong outburst of 2002 

      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.; Le Campion, J. F.; , (IOP Publishing, 2006-06-20)
      In 2003 April-May, 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 ...
    • Multiwavelength observations of a flare from markarian 501 

      Catanese, M.; Bradbury, S. M.; Breslin, A. C.; Buckley, J. H.; Carter-Lewis, D. A.; Cawley, M. F.; Dermer, C. D.; Fegan, D. J.; Finley, J. P.; Gaidos, J. A.; Hillas, A. M.; Johnson, W. N.; Krennrich, F.; Lamb, R. C.; Lessard, R. W.; Macomb, D. J.; McEnery, J. E.; Moriarty, P.; Quinn, J.; Rodgers, A. J.; Rose, H. J.; Samuelson, F. W.; Sembroski, G. H.; Srinivasan, R.; Weekes, T. C.; Zweerink, J. (IOP Publishing, 1997-10-01)
      We present multiwavelength observations of the BL Lacertae object Markarian 501 (Mrk 501) in 1997 between April 8 and April 19. Evidence of correlated variability is seen in very high energy (VHE; E greater than or similar ...
    • Search for high‐energy gamma rays from an x‐ray–selected blazar sample 

      de la Calle Perez, I.; Bond, I. H.; Boyle, P. J.; Bradbury, S. M.; Buckley, J. H.; Carter‐Lewis, D. A.; Celik, O.; Cui, W.; Dowdall, C.; Duke, C.; Falcone, A.; Fegan, D. J.; Fegan, S. J.; Finley, J. P.; Fortson, L.; Gaidos, J. A.; Gibbs, K.; Gammell, S.; Hall, J.; Hall, T. A.; Hillas, A. M.; Holder, J.; Horan, D.; Jordan, M.; Kertzman, M.; Kieda, D.; Kildea, J.; Knapp, J.; Kosack, K.; Krawczynski, H.; Krennrich, F.; LeBohec, S.; Linton, E. T.; Lloyd‐Evans, J.; Moriarty, P.; Muller, D.; Nagai, T. N.; Ong, R. A.; Page, M.; Pallassini, R.; Petry, D.; Power‐Mooney, B.; Quinn, J.; Rebillot, P.; Reynolds, P. T.; Rose, H. J.; Schroedter, M.; Sembroski, G. H.; Swordy, S. P.; Vassiliev, V. V.; Wakely, S. P.; Walker, G.; Weekes, T. C. (IOP Publishing, 2003-12-20)
      Our understanding of blazars has been greatly increased in recent years by extensive multiwavelength observations, particularly in the radio, X-ray, and gamma-ray regions. Over the past decade the Whipple 10 m telescope ...
    • Search for pulsed tev gamma‐ray emission from the crab pulsar 

      Lessard, R. W.; Bond, I. H.; Bradbury, S. M.; Buckley, J. H.; Burdett, A. M.; Carter‐Lewis, D. A.; Catanese, M.; Cawley, M. F.; D’Vali, M.; Fegan, D. J.; Finley, J. P.; Gaidos, J. A.; Gillanders, G. H.; Hall, T.; Hillas, A. M.; Krennrich, F.; Lang, M. J.; Masterson, C.; Moriarty, P.; Quinn, J.; Rose, H. J.; Samuelson, F. W.; Sembroski, G. H.; Srinivasan, R.; Vassiliev, V. V.; Weekes, T. C. (IOP Publishing, 2000-03-10)
      We present the results of a search for pulsed TeV emission from the Crab pulsar using the Whipple Observatory's 10-m gamma-ray telescope. The direction of the Crab pulsar was observed for a total of 73.4 hr between 1994 ...
    • Search for tev emissions from pulsars in binary systems 

      Hall, T. A.; Bond, I. H.; Bradbury, S. M.; Buckley, J. H.; Carson, M. J.; Carter‐Lewis, D. A.; Catanese, M.; Dunlea, S.; D’Vali, M.; Fegan, D. J.; Fegan, S. J.; Finley, J. P.; Gaidos, J. A.; Gillanders, G. H.; Hillas, A. M.; Horan, D.; Kertzman, M.; Kieda, D.; Kildea, J.; Knapp, J.; Krennrich, F.; Lang, M. J.; LeBohec, S.; Lessard, R.; Lloyd‐Evans, J.; McKernan, B.; Moriarty, P.; Muller, D.; Ong, R.; Quinn, J.; Reynolds, P. T.; Rose, H. J.; Sembroski, G. H.; Swordy, S. P.; Vassiliev, V. V.; Weekes, T. C. (IOP Publishing, 2003-02-01)
      A survey of binary systems containing pulsars was conducted, with the intention of detecting Galactic sources of very high energy gamma-ray emission. Observations were carried out with the Whipple 10 m imaging atmospheric ...
    • Spectrum of very high energy gamma‐rays from the blazar 1es 1959+650 during flaring activity in 2002 

      Daniel, M. K.; Badran, H. M.; Bond, I. H.; Boyle, P. J.; Bradbury, S. M.; Buckley, J. H.; Carter‐Lewis, D. A.; Catanese, M.; Celik, O.; Cogan, P.; Cui, W.; D’Vali, M.; de la Calle Perez, I.; Duke, C.; Falcone, A.; Fegan, D. J.; Fegan, S. J.; Finley, J. P.; Fortson, L. F.; Gaidos, J. A.; Gammell, S.; Gibbs, K.; Gillanders, G. H.; Grube, J.; Hall, J.; Hall, T. A.; Hanna, D.; Hillas, A. M.; Holder, J.; Horan, D.; Humensky, T. B.; Jarvis, A.; Jordan, M.; Kenny, G. E.; Kertzman, M.; Kieda, D.; Kildea, J.; Knapp, J.; Kosack, K.; Krawczynski, H.; Krennrich, F.; Lang, M. J.; Le Bohec, S.; Linton, E.; Lloyd‐Evans, J.; Milovanovic, A.; Moriarty, P.; Muller, D.; Nagai, T.; Nolan, S.; Ong, R. A.; Pallassini, R.; Petry, D.; Power‐Mooney, B.; Quinn, J.; Quinn, M.; Ragan, K.; Rebillot, P.; Reynolds, P. T.; Rose, H. J.; Schroedter, M.; Sembroski, G. H.; Swordy, S. P.; Syson, A.; Vassiliev, V. V.; Wakely, S. P.; Walker, G.; Weekes, T. C.; Zweerink, J. (IOP Publishing, 2005-03-01)
      The blazar 1ES 1959+650 was observed in a flaring state with the Whipple 10 m Imaging Atmospheric Cerenkov Telescope in 2002 May. A spectral analysis has been carried out on the data from that time period, and the resulting ...
    • Tev gamma‐ray observations of the perseus and abell 2029 galaxy clusters 

      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.; Humensky, T. 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.; Williams, D. A.; , (IOP Publishing, 2006-06-10)
      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 ...
    • The spectrum of tev gamma rays from the crab nebula 

      Hillas, A. M.; Akerlof, C. W.; Biller, S. D.; Buckley, J. H.; Carter‐Lewis, D. A.; Catanese, M.; Cawley, M. F.; Fegan, D. J.; Finley, J. P.; Gaidos, J. A.; Krennrich, F.; Lamb, R. C.; Lang, M. J.; Mohanty, G.; Punch, M.; Reynolds, P. T.; Rodgers, A. J.; Rose, H. J.; Rovero, A. C.; Schubnell, M. S.; Sembroski, G. H.; Vacanti, G.; Weekes, T. C.; West, M.; Zweerink, J. (IOP Publishing, 1998-08-20)
      The spectrum of gamma rays from the Crab Nebula has been measured in the energy range 500 GeV-8 TeV at the Whipple Observatory by the atmospheric Cerenkov technique. Two methods of analysis that were used to derive spectra, ...
    • Unpulsed optical emission from the crab pulsar 

      Golden, A.; Shearer, A.; Beskin, G. M. (IOP Publishing, 2000-05-20)
      Based on observations of the Crab pulsar using the TRIFFID high-speed imaging photometer in the UBV bands using the Special Astrophysical Observatory's 6 m telescope in the Russian Caucasus, we report the detection of ...
    • Very high‐energy observations of psr b1951+32 

      Srinivasan, R.; Boyle, P. J.; Buckley, J. H.; Carter‐Lewis, D. A.; Catanese, M.; Cawley, M. F.; Colombo, E.; Fegan, D. J.; Finley, J. P.; Gaidos, J. A.; Gordo, J. Bussons; Hillas, A. M.; Krennrich, F.; Lamb, R. C.; Lessard, R. W.; McEnery, J. M.; Moriarty, P.; Quinn, J.; Rose, H. J.; Samuelson, F. W.; Sembroski, G.; Weekes, T. C.; Wilson, C.; Zweerink, J. (IOP Publishing, 1997-11-01)
      PSR B1951 + 32 is a gamma-ray pulsar detected by the Energetic Gamma Ray Experiment Telescope (EGRET) and identified with the 39.5 ms radio pulsar in the supernova remnant CTB 80. The pulsar energy spectrum is consistent ...