Publication Type | Journal Article |
School or College | College of Science |
Department | Physics |
Creator | Sokolsky, Pierre |
Other Author | Ciampa, D.; Green, K.; Kolodziejczak, J.; Matthews, J.; Nitz, D.; Sinclair, D.; Thornton, G.; Van Der Velde, J. C.; Cassiday, G. L..; Cooper, R.; Corbato, S. C.; Dawson, B. R.; Elbert, J. W.; Fick, B. E.; Kieda, D. B.; Ko, S.; Liebing, D. F.; Loh, E. C.; Salamon, M. H.; Smith, J. D.; Thomas, S. B.; Wheeler, B. |
Title | Search for > 200 TeV photons from Cygnus X-3 in 1988 and 1989 |
Date | 1990-07 |
Description | Over a period of 16 months from April 1988 to August 1989, we have monitored the flux of cosmic-ray showers with energies above 2X 10^14 eV. We used a two-level array of scintillators covering an area of 3 X 10^4 m2 . Counters on the surface measure the size and direction of each shower while counters buried 3 m beneath the surface sample the muons. By selecting showers with relatively few muons (less than one-tenth the average) the background of hadron-induced showers should be reduced by a factor of 150 or more while showers started by y rays should not be affected by this cut. We find no evidence for an excess from the direction of Cygnus X-3 either in ordinary showers or in muon-poor showers. For energies above 2X 10^14 eV, with 90% confidence, we find the excess flux of cosmic rays from the direction of Cygnus X-3 to be less than 1.3X 10^-13 cm-2s-1 and the flux of photons (assuming they produce muon-poor showers) to be less than 1.5X10^-14 cm-V. This limit is substantially below the level of signals reported by earlier work. The period of observation included the intense radio bursts of June and July 1989. A portion of the data covering the 77-day period surrounding these events also showed no evidence for an excess. |
Type | Text |
Publisher | American Physical Society |
Journal Title | Physical Review D |
Volume | 42 |
Issue | 2 |
First Page | 281 |
Last Page | 288 |
DOI | 10.1103/PhysRevD.42.281 |
citatation_issn | 0556-2821 |
Subject | Cygnus X-3; Extensive air showers |
Subject LCSH | Gamma ray sources; Cosmic rays; Cosmic ray showers; X-ray binaries; Muons; Electrons; Particles (Nuclear physics) |
Language | eng |
Bibliographic Citation | Ciampa, D., Green, K., Kolodziejczak, J., Matthews, J., Nitz, D., Sinclair, D., Thornton, G., Van Der Velde, J. C., Cassiday, G. L., Cooper, R., Corbato, S. C., Dawson, B. R., Elbert, J. W., Fick, B. E., Kieda, D. B., Ko, S., Liebing, D. F., Loh, E. C., Salamon, M. H., Smith, J. D., Sokolsky, P., Thomas, S. B., & Wheeler, B. (1990). Search for > 200 TeV photons from Cygnus X-3 in 1988 and 1989. Physical Review D, 42(2), 281-8. |
Rights Management | (c) American Physical Society http://dx.doi.org/10.1103/PhysRevD.42.281 |
Format Medium | application/pdf |
Format Extent | 602,988 bytes |
Identifier | ir-main,10560 |
ARK | ark:/87278/s6db8kd4 |
Setname | ir_uspace |
ID | 706242 |
Reference URL | https://collections.lib.utah.edu/ark:/87278/s6db8kd4 |