Proposal code

v050

Proposal title

Subparsec scale structure of X-ray selected BL Lacertae objects

The

Investigators and their

Affiliations

P.I. R. I. Kollgaard The Pennsylvania State University
D. C. Gabuzda Lebedev Physical Institute
E. D. Feigelson The Pennsylvania State University

Proposal Abstract

The HEAO-1 all-sky X-ray survey provides a well-defined sample of X- ray selected BL Lacertae objects (XBLs). These objects lie within FR I radio galaxies with 0.03 < z < 0.3 (closer than the XBL samples from Einstein and Rosat) and are the only sample of XBLs suitable for detailed VLBI studies. Our VLA studies show that HEAO-1 XBLs are less core-dominated and likely less strongly beamed than radio-selected BL Lacs (RBLs). Our initial work shows intrinsic differences between XBL and RBL parsec-scale jets, in addition to orientation effects. We request VSOP observations of the radio brightest HEAO-1 XBLs to complement our ongoing VLA, VLBA and X-ray observations. Both by themselves and with coordinated X-ray observations, the VSOP results can test competing theories about XBLs and RBLs and elucidate the physical conditions in the relativistic jets.

The full Cover Sheets (compressed post-script, typically 50kbytes) can be retrieved. Note that many proposals were reduced in extent by the Scientific Review Committee (e.g. by reducing the number of experiments), however the Cover Sheets contain the full proposal as submitted. Also note that AO1 proposals were submitted in November 1995, and information such as affiliations and contact details has changed for some proposers since that time. The Cover Sheets (and the details on this page, which were derived from the Cover Sheets) may therefore have changed.