A Slower Superluminal Velocity for the Quasar 1156+295
نویسندگان
چکیده
منابع مشابه
Slower Superluminal Velocity for the Quasar 1156 + 295
As part of an ongoing effort to observe high energy γ-ray blazars with VLBI, we have produced 8 and 2 GHz VLBI images, at ten epochs spanning the years 1988 to 1996, of the quasar 1156+295. The VLBI data have been taken from the Washington VLBI correlator’s geodetic database. We have detected four components and have measured their apparent speeds to be 8.8 ± 2.3, 5.3 ± 1.1, 5.5 ± 0.9, and 3.5 ...
متن کاملSuperluminal Signal Velocity
It recently has been demonstrated that signals conveyed by evanescent modes can travel faster than light. In this report some special features of signals are introduced and investigated, for instance the fundamental property that signals are frequency band limited. Evanescent modes are characterized by extraordinary properties: Their energy is negative, they are not directly measurable, and the...
متن کاملSuperluminal Velocity To Time Machines ?
Various experiments have shown superluminal group and signal velocities recently. Experiments were essentials carried out with microwave tunnelling [1], with frustrated total internal reflection [2], and with gain-assisted anomalous dispersion [3]. According to text books a superluminal signal velocity violates Einstein causality implying that cause and effect can be changed and time machines k...
متن کاملVariability and Velocity of Superluminal Sources
We investigate the relation between the Doppler factor determined from variations in total flux at 22 and 37 GHz, and the apparent transverse velocity determined from VLBA observations at 2 cm. The data are consistent with the relativistic beaming theory for compact radio sources, in that the distribution of β app /δ var , for 30 quasars, is roughly consistent with a Monte Carlo simulation. The...
متن کاملA high - velocity narrow absorption line outflow in the quasar
We report on the discovery of a high-velocity narrow absorption line outflow in the redshift 2.3 quasar J212329.46 − 005052.9. Five distinct outflow systems are detected with velocity shifts from −9710 to −14 050 km s−1 and C IV λλ1548, 1551 linewidths of FWHM ≈ 62– 164 km s−1. This outflow is remarkable for having high speeds and a degree of ionization similar to broad absorption line (BAL) fl...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1997
ISSN: 0004-637X
DOI: 10.1086/310820