3-11 July 2007
Merida, Mexico
Mexico/General timezone
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OG 2.3

Place

Location: Merida, Mexico
Room: Uxmal + Tulum (Holiday Inn)
Date: 9 Jul 10:30 - 11:55

Timetable | Contribution List

Displaying 7 contributions out of 7
Type: Oral Session: OG 2.3
Track: OG.2.3
The MAGIC telescope has observed very high energy gamma-ray emission from the BL Lac object PG 1553+113 in 2005 and 2006 at an overall significance is 8.8 sigma in 18.8h. The light curve shows no significant flux variations on a daily time-scale. The flux level during 2005 was, however, significantly higher compared to 2006. The differential energy spectrum between ~90 GeV and 500 GeV is well ... More
Presented by Dr. Robert WAGNER on 9/7/2007 at 15:30
Type: Oral Session: OG 2.3
Track: OG.2.3
Clusters of galaxies, the largest gravitationally bound objects in the universe, are expected to contain a significant population of hadronic and leptonic cosmic rays. Potential sources for these particles are merger and accretion shocks, starburst driven galactic winds and radio galaxies. Furthermore, since galaxy clusters confine cosmic ray protons up to energies of at least 1 PeV for a tim ... More
Presented by Dr. Wilfried DOMAINKO on 9/7/2007 at 16:30
Type: Oral Session: OG 2.3
Track: OG.2.3
The high-frequency peaked BL Lac PKS 2155-304, the lighthouse of the Southern hemisphere sky at VHE gamma-ray energies, has been followed by the H.E.S.S. array of atmospheric Cherenkov telescopes since the first light of the project, first with a single telescope in 2002, then with two & three telescopes in 2003, and since 2004 with the full-sensitivity four-telescope array. In this mode, a n ... More
Presented by Dr. Michael PUNCH on 9/7/2007 at 15:42
Type: Oral Session: OG 2.3
Track: OG.2.3
More than forty gamma-ray sources have been detected by atmospheric Cherenkov telescopes at TeV energies. However, no cluster of galaxies have been proved to be a TeV gamma-ray emitter until now, though there are many theoretical predictions on the possible gamma-ray fluxes from these gigantic objects assuming various emission mechanisms. We have observed a couple of clusters of galaxies in ... More
Presented by Mr. Ryuta KIUCHI on 9/7/2007 at 16:42
Type: Oral Session: OG 2.3
Track: OG.2.3
VHE observations of the distant (z=0.186) blazar 1ES 1101-232 with H.E.S.S. are used to constrain the extragalactic background light (EBL) in the optical to near infrared band. As the EBL traces the galaxy formation history of the universe, galaxy evolution models can therefore be tested with the data. In order to measure the EBL absorption effect on a blazar spectrum, we assume that usual con ... More
Presented by Dr. Gerd PUEHLHOFER on 9/7/2007 at 16:18
Type: Oral Session: OG 2.3
Track: OG.2.3
Since 1983, the Whipple 10m Gamma-ray Telescope was operated with a full observing program. During that time, five new sources of very high energy (VHE; E > 100 GeV) emission were discovered; spectral and temporal characteristics of five blazars were established and many other potential sources were studied in detail. In September 2005, the observing program was redefined and the 10m was dedi ... More
Presented by Dr. David STEELE on 9/7/2007 at 15:54
Type: Oral Session: OG 2.3
Track: OG.2.3
The understanding of mechanisms in active galactic nuclei requires the detection of a large sample of very high energy gamma-ray objects at varying redshifts. The gamma-astronomical researches are carrying out with SHALON mirror telescope at the Tien-Shan high-mountain observatory since 1992. The redshifts of SHALON very high energy gamma-ray sources range from z=0.0183 to z=1.375. The most di ... More
Presented by Prof. Vera Georgievna SINITSYNA on 9/7/2007 at 16:06
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