A SEARCH FOR PULSATIONS FROM GEMINGA ABOVE 100 GeV WITH VERITAS

Journal Article · Tue Feb 10 00:00:00 EST 2015 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/800/1/61· OSTI ID:22364216

Aliu, E. ^[1]; Archambault, S. ^[2]; Archer, A.; Beilicke, M.; Buckley, J. H.; Bugaev, V. ^[3]; Aune, T. ^[4]; Barnacka, A. ^[5]; Benbow, W.; Cerruti, M. ^[6]; Bird, R. ^[7]; Byrum, K. ^[8]; Cardenzana, J. V.; Dickinson, H. J.; Eisch, J. D. ^[9]; Chen, X. ^[10]; Ciupik, L. ^[11]; Connolly, M. P. ^[12]; Cui, W. ^[13]; others, and

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1. Department of Physics and Astronomy, Barnard College, Columbia University, NY 10027 (United States)
2. Physics Department, McGill University, Montreal, QC H3A 2T8 (Canada)
3. Department of Physics, Washington University, St. Louis, MO 63130 (United States)
4. Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States)
5. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
6. Fred Lawrence Whipple Observatory, Harvard-Smithsonian Center for Astrophysics, Amado, AZ 85645 (United States)
7. School of Physics, University College Dublin, Belfield, Dublin 4 (Ireland)
8. Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439 (United States)
9. Department of Physics and Astronomy, Iowa State University, Ames, IA 50011 (United States)
10. Institute of Physics and Astronomy, University of Potsdam, D-14476 Potsdam-Golm (Germany)
11. Astronomy Department, Adler Planetarium and Astronomy Museum, Chicago, IL 60605 (United States)
12. School of Physics, National University of Ireland Galway, University Road, Galway (Ireland)
13. Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907 (United States)

We present the results of 71.6 hr of observations of the Geminga pulsar (PSR J0633+1746) with the VERITAS very-high-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{sup –13} s{sup –1} cm{sup –2} and 1.7 × 10{sup –13} s{sup –1} cm{sup –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.

• OSTI ID: 22364216
• Journal Information: Astrophysical Journal, Vol. 800, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
COSMIC PHOTONS
EMISSION SPECTRA
ENERGY SPECTRA
GAMMA RADIATION
GEV RANGE
MATHEMATICAL SOLUTIONS
PHOTON EMISSION
PULSARS
PULSATIONS
SPACE
STARS
TELESCOPES