Browsing School of Physics by Subject "Astrophysics - High Energy Astrophysical Phenomena"
Now showing items 21-31 of 31
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A search for optical bursts from RRAT J1819-1458: II. Simultaneous ULTRACAM-Lovell Telescope observations
(2011)The Rotating RAdio Transient (RRAT) J1819-1458 exhibits ~3 ms bursts in the radio every ~3 min, implying that it is visible for only ~1 per day. Assuming that the optical light behaves in a similar manner, long exposures ... -
Simultaneous Multiwavelength Observations of Markarian 421 During Outburst
(2009)We report on the results of two coordinated multiwavelength campaigns that focused on the blazar Markarian 421 during its 2006 and 2008 outbursts. These campaigns obtained UV and X-ray data using the XMM-Newton satellite, ... -
TeV and Multi-wavelength Observations of Mrk 421 in 2006-2008
(2011)We report on TeV gamma-ray observations of the blazar Mrk 421 (redshift of 0.031) with the VERITAS observatory and the Whipple 10m Cherenkov telescope. The excellent sensitivity of VERITAS allowed us to sample the TeV ... -
VERITAS 2008 - 2009 monitoring of the variable gamma-ray source M87
(2010)M87 is a nearby radio galaxy that is detected at energies ranging from radio to VHE gamma-rays. Its proximity and its jet, misaligned from our line-of-sight, enable detailed morphological studies and extensive modeling at ... -
VERITAS Observations of a Very High Energy Gamma-ray Flare from the Blazar 3C 66A
(2009)The intermediate-frequency peaked BL Lacertae (IBL) object 3C 66A is detected during 2007 - 2008 in VHE (very high energy: E > 100 GeV) gamma-rays with the VERITAS stereoscopic array of imaging atmospheric Cherenkov ... -
VERITAS observations of the BL Lac 1ES 1218+304
(2009)The VERITAS collaboration reports the detection of very-high-energy (VHE) gamma-ray emission from the high-frequency-peaked BL Lac object 1ES 1218+304 located at a redshift of z=0.182. A gamma-ray signal was detected with ... -
VERITAS Observations of the TeV Binary LS I +61 303 During 2008-2010
(2011)We present the results of observations of the TeV binary LS I +61 303 with the VERITAS telescope array between 2008 and 2010, at energies above 300 GeV. In the past, both ground-based gamma-ray telescopes VERITAS and MAGIC ... -
VERITAS Observations of the Unusual Extragalactic Transient Swift J164449.3+573451
(2011)We report on very-high-energy ($>$100 GeV) gamma-ray observations of Swift J164449.3+573451, an unusual transient object first detected by the {\it Swift} Observatory and later detected by multiple radio, optical and ... -
VERITAS Upper Limit on the VHE Emission from the Radio Galaxy NGC 1275
(2009)The recent detection by the Fermi gamma-ray space telescope of high-energy gamma-rays from the radio galaxy NGC 1275 makes the observation of the very high energy (VHE: E > 100 GeV) part of its broadband spectrum ... -
VERITAS: Status and Highlights
(2011)The VERITAS telescope array has been operating smoothly since 2007, and has detected gamma-ray emission above 100 GeV from 40 astrophysical sources. These include blazars, pulsar wind nebulae, supernova remnants, gamma-ray ...