RXTE Observations of PKS 2155-304 during the November 1997 Gamma-Ray Outburst
نویسنده
چکیده
We present x-ray observations of the nearby BL Lac PKS 2155-304 taken when it was undergoing a GeV/TeV gamma-ray outburst. During the outburst we measured xray fluxes in the 2-10 keV band that are the largest ever observed for PKS 2155-304. Comparison of these November 1997 measurements and other x-ray observations made contemporaneously with GeV or TeV gamma-ray observations indicate that x-ray and gamma-ray emissions are correlated. Measurements with x-ray all-sky monitors such as the ASM/RXTE and MOXE can therefore signal the presence of outbursts at gamma-ray energies from PKS 2155-304.
منابع مشابه
VHE Gamma Rays from PKS 2155 – 304
The close X-ray selected BL Lac PKS 2155–304 has been observed using the University of Durham Mark 6 very high energy (VHE) gamma ray telescope during 1996 September/October/November and 1997 October/November. VHE gamma rays with energy > 300 GeV were detected from this object with a time-averaged integral flux of (4.2 ± 0.7 stat ± 2.0 sys) × 10 −11 cm −2 s −1. There is evidence for VHE gamma r...
متن کاملar X iv : a st ro - p h / 98 12 12 2 v 1 7 D ec 1 99 8 PKS 2155 – 304 — a source of VHE γ - rays
The close X-ray selected BL Lac PKS 2155–304 has been observed using the University of Durham Mark 6 very high energy (VHE) gamma ray telescope during 1996 September/October/November and 1997 October/November. VHE gamma rays with energy > 300 GeV were detected with a time-averaged integral flux of (4.2±0.7 stat ±2.0 sys)×10 −11 cm −2 s −1. There is evidence for VHE gamma ray emission during our...
متن کاملProposed search method for gravitational waves from PKS 2155-304 and other blazar flares
We motivate searches for gravitational waves from transient blazar flares with emphasis on PKS 2155-304. PKS 2155-304 is a blazar with redshift approximately equal to 0.12. On July 28 2006, the H.E.S.S. atmospheric Cherenkov telescopes detected an outburst of TeV gamma rays from this object lasting approximately two hours with total isotropic equivalent energy released in TeV gamma rays (withou...
متن کاملHigh zenith angle observations of PKS 2155-304 with the MAGIC telescope
The high frequency peaked BL Lac PKS 2155-304 with a redshift z=0.116 was discovered 1997 in the VHE range by the University of Durham Mark 6 γ-ray telescope in Australia with a flux corresponding to ∼0.2 times the Crab Nebula flux [1]. It was later observed and detected with high significance by the Southern observatories CANGAROO and H.E.S.S. establishing this source as the best studied South...
متن کاملar X iv : a st ro - p h / 04 04 16 2 v 1 7 A pr 2 00 4 Long - term optical variability of the blazars PKS 2005 - 489 and PKS 2155 - 304
We present optical light curves for the period 1996-2000, of two of the brightest known EGRET BL Lac objects: PKS 2005-489 and PKS 2155-304, the latter also one of the few known TeV sources. For both objects, quiescent epochs of low level of variability were followed by active periods, without any indication of periodicity. In PKS 2005-489, several variability events with duration of about 20 d...
متن کامل