Search
Now showing items 1-9 of 9
Multiwavelength observations of a flare from markarian 501
(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 ...
Cutoff in the t[clc]e[/clc]v energy spectrum of markarian 421 during strong flares in 2001
(IOP Publishing, 2001-10-10)
Exceptionally strong and long- lasting flaring activity of the blazar Mrk 421 occurred between 2001 January and March. Based on the excellent signal- to- noise ratio of the data, we derive the energy spectrum between 260 ...
Constraints on the very high energy emission from bl lacertae objects
(IOP Publishing, 2004-03-01)
We present results from observations of 29 BL Lacertae objects, taken with the Whipple Observatory 10 m gamma-ray telescope between 1995 and 2000. The observed objects are mostly at low redshift (z<0.2), but observations ...
Observation of m87 at 400 gev with the whipple 10 meter telescope
(IOP Publishing, 2004-07-20)
We present results from observations taken with the Whipple 10 m very high energy gamma-ray telescope with maximal sensitivity at 400 GeV during 39 hr between 2000 and 2003 in the direction of the giant radio galaxy M87. ...
Veritas observations of day-scale flaring of m 87 in 2010 april
(IOP Publishing, 2012-02-01)
VERITAS has been monitoring the very-high-energy (VHE; &gt; 100 GeV) gamma-ray activity of the radio galaxy M87 since 2007. During 2008, flaring activity on a timescale of a few days was observed with a peak flux of ...
Veritas 2008-2009 monitoring of the variable gamma-ray source m 87
(IOP Publishing, 2010-05-21)
M 87 is a nearby radio galaxy that is detected at energies ranging from radio to very high energy (VHE) gamma rays. Its proximity and its jet, misaligned from our line of sight, enable detailed morphological studies and ...
Observation of gamma‐ray emission from the galaxy m87 above 250 gev with veritas1
(IOP Publishing, 2008-05-20)
The multiwavelength observation of the nearby radio galaxy M87 provides a unique opportunity to study in detail processes occurring in active galactic nuclei from radio waves to TeV gamma-rays. Here we report the detection ...
Veritas observations of the tev binary ls i +61° 303 during 2008-2010
(IOP Publishing, 2011-08-09)
We present the results of observations of the TeV binary LS I + 61 degrees 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 ...
Discovery of variability in the very high energy γ-ray emission of 1es 1218+304 with veritas
(IOP Publishing, 2010-01-14)
We present results from an intensive VERITAS monitoring campaign of the high-frequency peaked BL Lac object 1ES 1218+304 in 2008/2009. Although 1ES 1218+304 was detected previously by MAGIC and VERITAS at a persistent level ...