We present a new well defined sample of BL Lac objects selected from the ROSAT All-Sky Survey (RASS). The sample consists of 39 objects with 35 forming a flux limited sample down to f_X = 8 x 10^{-13} cgs, redshifts are known for 33 objects (and 31 of the complete sample). X-ray spectral properties were determined for each object individually with the RASS data. The luminosity function of RASS selected BL Lac objects is compatible with results provided by objects selected with the Einstein observatory, but the RASS selected sample contains objects with luminosities at least tenfold higher. Our analysis confirms the negative evolution for X-ray selected BL Lac objects found in a sample by the Einstein observatory, the parameterization provid...
In an earlier paper we presented nuclear X-ray flux densities, measured with ROSAT, for the B2 brigh...
We present recent X-ray observations of intermediate BL Lac objects (IBLs), i.e. BL Lacs which are l...
Fermi has provided the largest sample of γ-ray-selected blazars to date. In this work we use a unifo...
We present a new well defined sample of BL Lac objects selected from the ROSAT All-Sky Survey (RASS)...
Abstract. We present a new well defined sample of BLLac objects selected from the ROSAT All-Sky Surv...
The unification of X-ray and radio selected BL Lacs has been an outstanding problem in the blazar re...
The unification of X-ray and radio selected BL Lacs has been an outstanding problem in the blazar re...
We present recent ROSAT, ASCA and SAX observations of intermediate BL Lac objects (IBLs), i.e. BL La...
ROSAT observations of a homogeneous sample of radio--selected BL Lac objects are presented. Results ...
ROSAT data as well as archival radio and optical data are used for a broad band study of a large gro...
Fermi has provided the largest sample of γ-ray-selected blazars to date. In this work we use a unifo...
This thesis is an analysis of the X-ray, optical, infrared and radio properties of a sample of c...
Combining newly identified and previously known BL Lacs from the RASS-Green Bank (RGB) catalog, we p...
BL Lac objects are an elusive and rare class of active galactic nuclei. For years their evolutionary...
Many properties of BL Lacs have become explicable in terms of the "relativistic beaming" hypothesis ...
In an earlier paper we presented nuclear X-ray flux densities, measured with ROSAT, for the B2 brigh...
We present recent X-ray observations of intermediate BL Lac objects (IBLs), i.e. BL Lacs which are l...
Fermi has provided the largest sample of γ-ray-selected blazars to date. In this work we use a unifo...
We present a new well defined sample of BL Lac objects selected from the ROSAT All-Sky Survey (RASS)...
Abstract. We present a new well defined sample of BLLac objects selected from the ROSAT All-Sky Surv...
The unification of X-ray and radio selected BL Lacs has been an outstanding problem in the blazar re...
The unification of X-ray and radio selected BL Lacs has been an outstanding problem in the blazar re...
We present recent ROSAT, ASCA and SAX observations of intermediate BL Lac objects (IBLs), i.e. BL La...
ROSAT observations of a homogeneous sample of radio--selected BL Lac objects are presented. Results ...
ROSAT data as well as archival radio and optical data are used for a broad band study of a large gro...
Fermi has provided the largest sample of γ-ray-selected blazars to date. In this work we use a unifo...
This thesis is an analysis of the X-ray, optical, infrared and radio properties of a sample of c...
Combining newly identified and previously known BL Lacs from the RASS-Green Bank (RGB) catalog, we p...
BL Lac objects are an elusive and rare class of active galactic nuclei. For years their evolutionary...
Many properties of BL Lacs have become explicable in terms of the "relativistic beaming" hypothesis ...
In an earlier paper we presented nuclear X-ray flux densities, measured with ROSAT, for the B2 brigh...
We present recent X-ray observations of intermediate BL Lac objects (IBLs), i.e. BL Lacs which are l...
Fermi has provided the largest sample of γ-ray-selected blazars to date. In this work we use a unifo...