Is 0716 + 714 a superluminal blazar ?

نویسندگان

  • U. Bach
  • T. P. Krichbaum
  • E. Ros
  • S. Britzen
  • A. Witzel
  • J. A. Zensus
چکیده

We present an analysis of new and old high frequency VLBI data collected during the last 10 years at 5– 22 GHz. For the jet components in the mas-VLBI jet, two component identifications are possible. One of them with quasi-stationary components oscillating about their mean positions. Another identification scheme, which formally gives the better expansion fit, yields motion with ∼ 9 c for H0 = 65 km s −1 Mpc −1 and q0 = 0.5. This model would be in better agreement with the observed rapid IDV and the expected high Lorentz-factor, deduced from IDV.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Kinematic Study of the Blazar 0716 + 714

We determined the kinematics at the jet of 0716+714 from a re-analysis of multi-frequency VLBI data (5, 8.4, 15, 22 GHz) obtained during the last 10 years combined with data from the literature. For this intra-day variable blazar, only a lower limit of its distance is known (z ≥ 0.3). We find that 0716+714 is a relatively fast superluminal source (with a Lorentz factor of γ > 15), revising earl...

متن کامل

Multi - frequency VLBA study of the blazar S 5 0716 + 714 during the active state in 2004 I . Inner jet kinematics

We observed blazar 0716+714 with the VLBA during the active state in 2003-2004. In this paper we discuss multi-frequency analysis of the inner jet (first 1 mas) kinematics. The unprecedentedly dense time sampling allows us to trace jet components without misidentification and to calculate the component speeds with good accuracy. In the smooth superluminal jet we were able to identify and track ...

متن کامل

Kinematic study of the blazar S 5 0716 + 714

We present the results of a multi-frequency study of the structural evolution of the VLBI jet in the BL Lac object 0716+714 over the last 10 years. We show VLBI images obtained at 5 GHz, 8.4 GHz, 15 GHz and 22 GHz. The milliarcsecond source structure is best described by a one-sided core-dominated jet of ∼ 10 mas length. Embedded jet components move su-perluminally with speeds ranging from 5 c ...

متن کامل

Periodic Oscillations in the Intra - day Optical Light Curves of the Blazar S 5 0716 + 714

We present results of a periodicity search of 20 intra-day variable optical light curves of the blazar S5 0716+714, selected from a database of 102 light curves spanning over three years. We use a wavelet analysis technique along with a randomization test and find strong candidates for nearly periodic variations in eight light curves, with probabilities ranging from 95% to >99%. This is the fir...

متن کامل

Discovery of Very High Energy γ - rays from the famous blazar S 5 0716 + 714

The MAGIC collaboration reports the detection of the blazar S50716+714 (redshift uncertain) in very high energy gamma-rays. The observations were performed in November 2007 and in April 2008, and were triggered by the KVA telescope due to the high optical state of the object. The blazar S50716+714 is the third low frequency BL Lac detected at energies above 100 GeV until today. Here, we present...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2002