Fanaroff-Riley I galaxies as the parent population of BL Lacertae objects. II - Optical constraints

1991 ◽  
Vol 368 ◽  
pp. 373 ◽  
Author(s):  
Paolo Padovani ◽  
C. Megan Urry
Keyword(s):  
Parent Population ◽  
Bl Lacertae Objects ◽  
Bl Lacertae

Radio constraints on the nature of BL Lacertae objects and their parent population

1992 ◽  
Vol 104 ◽  
pp. 1687 ◽  
Author(s):  
R. I. Kollgaard ◽  
J. F. C. Wardle ◽  
D. H. Roberts ◽  
D. C. Gabuzda
Keyword(s):  
Parent Population ◽  
Bl Lacertae Objects ◽  
Bl Lacertae

Radio morphology and parent population of X-ray selected BL Lacertae objects

1993 ◽  
Vol 106 ◽  
pp. 875 ◽  
Author(s):  
S. A. Laurent-Muehleisen ◽  
R. I. Kollgaard ◽  
G. A. Moellenbrock ◽  
E. D. Feigelson
Keyword(s):  
Parent Population ◽  
Bl Lacertae Objects ◽  
X Ray ◽  
Bl Lacertae

scholarly journals Radio to X-ray Energy Distribution of BL Lacertae Objects

1994 ◽  
Vol 159 ◽  
pp. 506-507
Author(s):  
P. Giommi ◽  
S. G. Ansari ◽  
A. Micol
Keyword(s):  
Energy Distribution ◽  
High Energy ◽  
Optical Spectra ◽  
Archival Data ◽  
Parent Population ◽  
Energy Distributions ◽  
Bl Lacertae Objects ◽  
X Ray ◽  
Bl Lacertae

We have constructed radio to X-ray energy distributions for a large number of BL Lacertae objects using archival data. We find that Radio to optical spectra of RBLs and XBLs are very similar. Large differences are seen at higher frequencies where RBLs very frequently show a cutoff near the optical band while XBLs usually do not show any turnover before UV/X-ray energies. Our data is consistent with a picture where RBL and XBL are from the same parent population, the XBL simply being those (rare) objects where the break in the energy distribution is located at high energy.

scholarly journals Astrophysical implications of binary black holes in BL Lacertae objects

2002 ◽  
Vol 388 (2) ◽  
pp. 470-476 ◽  
Author(s):  
F. De Paolis ◽  
G. Ingrosso ◽  
A. A. Nucita
Keyword(s):  
Black Holes ◽  
Bl Lacertae Objects ◽  
Binary Black Holes ◽  
Bl Lacertae

scholarly journals Longterm optical monitoring of bright BL Lacertae objects with ATOM: Spectral variability and multiwavelength correlations

2014 ◽  
Vol 573 ◽  
pp. A69 ◽  
Author(s):  
Alicja Wierzcholska ◽  
Michał Ostrowski ◽  
Łukasz Stawarz ◽  
Stefan Wagner ◽  
Marcus Hauser
Keyword(s):  
Optical Monitoring ◽  
Spectral Variability ◽  
Bl Lacertae Objects ◽  
Bl Lacertae

scholarly journals Polarization VLBI Observations of a Complete Sample of Northern BL Lacertae Objects

1998 ◽  
Vol 164 ◽  
pp. 165-166
Author(s):  
A. B. Pushkarev ◽  
D. C. Gabuzda
Keyword(s):  
Magnetic Field ◽  
Radio Emission ◽  
Synchrotron Emission ◽  
Complete Sample ◽  
Bl Lacertae Objects ◽  
Bl Lacertae ◽  
Vlbi Observations ◽  
Core Components ◽  
Jet Structure ◽  
The Magnetic Field

AbstractThe polarization electric vectors in the VLBI jets of BL Lacertae objects are typically aligned with the jet structure. If the jet radio emission is optically thin synchrotron emission, this implies that the magnetic field is perpendicular to the jet, usually interpreted as a signature of shocks. The distribution of polarization position angles in the VLBI core components appears to be bimodal, with the polarization angles either aligned with or perpendicular to the jet direction. In order to study the origin of this characteristic polarization structure, we have made VLBI polarization observations of all 34 sources in the Kühr and Schmidt sample of BL Lacertae objects.

scholarly journals Host galaxy subtraction of TeV candidate BL Lacertae objects

2007 ◽  
Vol 475 (1) ◽  
pp. 199-207 ◽  
Author(s):  
K. Nilsson ◽  
M. Pasanen ◽  
L. O. Takalo ◽  
E. Lindfors ◽  
A. Berdyugin ◽  
...  
Keyword(s):  
Host Galaxy ◽  
Bl Lacertae Objects ◽  
Bl Lacertae

scholarly journals The intraday variability in the radio-selected and X-ray-selected BL Lacertae objects

1998 ◽  
Vol 132 (1) ◽  
pp. 83-92 ◽  
Author(s):  
J. M. Bai ◽  
G. Z. Xie ◽  
K. H. Li ◽  
X. Zhang ◽  
W. W. Liu
Keyword(s):  
Bl Lacertae Objects ◽  
X Ray ◽  
Bl Lacertae ◽  
Intraday Variability
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