scholarly journals Multiepoch Very Long Baseline Array Observations of EGRET‐detected Quasars and BL Lacertae Objects: Connection between Superluminal Ejections and Gamma‐Ray Flares in Blazars

2001 ◽  
Vol 556 (2) ◽  
pp. 738-748 ◽  
Author(s):  
Svetlana G. Jorstad ◽  
Alan P. Marscher ◽  
John R. Mattox ◽  
Margo F. Aller ◽  
Hugh D. Aller ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Bl Lacertae Objects ◽  
Bl Lacertae ◽  
Long Baseline ◽  
Very Long Baseline Array

scholarly journals Multiepoch Very Long Baseline Array Observations of EGRET‐detected Quasars and BL Lacertae Objects: Superluminal Motion of Gamma‐Ray Bright Blazars

2001 ◽  
Vol 134 (2) ◽  
pp. 181-240 ◽  
Author(s):  
Svetlana G. Jorstad ◽  
Alan P. Marscher ◽  
John R. Mattox ◽  
Ann E. Wehrle ◽  
Steven D. Bloom ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Bl Lacertae Objects ◽  
Bl Lacertae ◽  
Long Baseline ◽  
Superluminal Motion ◽  
Very Long Baseline Array

Optical Monitoring of Three Gamma-Ray-loud BL Lacertae Objects in 1999-2002

2004 ◽  
Vol 128 (5) ◽  
pp. 1929-1941 ◽  
Author(s):  
X. Zhang ◽  
L. Zhang ◽  
G. Zhao ◽  
Z.-H. Xie ◽  
L. Wu ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Optical Monitoring ◽  
Bl Lacertae Objects ◽  
Bl Lacertae

Gamma-ray bright quasars and BL Lacertae objects: EGRET data

1994 ◽  
Vol 92 ◽  
pp. 623 ◽  
Author(s):  
Jonathan Schachter ◽  
Martin Elvis
Keyword(s):  
Gamma Ray ◽  
Bl Lacertae Objects ◽  
Bl Lacertae

scholarly journals Science with radio pulsar astrometry

2012 ◽  
Vol 8 (S291) ◽  
pp. 269-269 ◽  
Author(s):  
Shami Chatterjee
Keyword(s):  
Gamma Ray ◽  
Radio Pulsars ◽  
Long Baseline ◽  
Pulsar Timing ◽  
Pulse Timing ◽  
Model Independent ◽  
Scientific Results ◽  
Very Long Baseline Array ◽  
Gravitational Wave Background ◽  
Precision Astrometry

AbstractHigh precision astrometry on radio pulsars can provide model-independent estimates of their distances and velocities. Such estimates serve to calibrate models of the Galactic electron density distribution, thereby improving distance estimates for the entire pulsar population. They can provide independent astrometric information for precision pulse timing, reducing the number of fit parameters and thus potentially improving the sensitivity of pulsar timing arrays to the gravitational wave background. Individual neutron stars also serve as laboratories for astrophysics. For example, distances to highly luminous recycled pulsars identified by the Fermi gamma ray space telescope will constrain their energetics and may serve to probe the equation of state for nuclear matter at extremes of density and pressure. Here we provide an update on ongoing astrometry programs with the Very Long Baseline Array and the scientific results from these efforts.

Gamma-Ray and Multiwaveband Emission from Gamma-Ray-Loud BL Lacertae Objects

2003 ◽  
Vol 20 (7) ◽  
pp. 1183-1186 ◽  
Author(s):  
Zhang Xiong ◽  
Zhao Gang ◽  
Cheng Guang-Sheng ◽  
Zhang Li
Keyword(s):  
Gamma Ray ◽  
Bl Lacertae Objects ◽  
Bl Lacertae

scholarly journals Radio and Gamma-ray emission in nearby BL Lacs

2013 ◽  
Vol 9 (S304) ◽  
pp. 200-203 ◽  
Author(s):  
G. Giovannini ◽  
E. Liuzzo ◽  
B. Boccardi ◽  
M. Giroletti
Keyword(s):  
Active Galactic Nuclei ◽  
Gamma Ray ◽  
Galactic Nuclei ◽  
Scale Structure ◽  
Bl Lac Objects ◽  
Long Baseline ◽  
Γ Ray ◽  
Gamma Ray Emission ◽  
Very Long Baseline Array ◽  
Bl Lacs

AbstractThe advent of Fermi is changing our understanding on the radio and γ-ray emission in active galactic nuclei. Unlike pre-Fermi ideas, BL Lac objects are found to be the most abundant emitters in the γ-ray band. However, since they are relatively weak radio sources, most of their parsec-scale structure and their multifrequency properties are poorly understood and/or have not been investigated in a systematic fashion. Here we are analyzing the radio and γ-ray emission properties of a sample of 42 BL Lacs selected with no constraint on their radio and γ-ray emission. Thanks to new Very Long Baseline Array observations at 8 and 15 GHz for the whole sample, we discuss their parsec-scale structure. Parsec-scale radio emission is observed in the majority of the sources at both frequencies. The comparison between our results in radio and gamma-ray bands points out the presence of a large number of faint BL Lacs showing “non-classical” properties such as low source compactness, low core dominance, no gamma-ray emission.

Comparison of X-Ray– and Radio-selected BL Lacertae Objects in High-Energy Gamma-Ray Observations

1997 ◽  
Vol 476 (1) ◽  
pp. L11-L14 ◽  
Author(s):  
Y. C. Lin ◽  
D. L. Bertsch ◽  
B. L. Dingus ◽  
J. A. Esposito ◽  
C. E. Fichtel ◽  
...  
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
Bl Lacertae Objects ◽  
X Ray ◽  
Bl Lacertae ◽  
High Energy Gamma ◽  
Energy Gamma
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