Engineering topics

Laurent-Muehleisen, S. A.

Publications and source records attributed to Laurent-Muehleisen, S. A..

2 records

NASA NTRS1993

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

High-dynamic range (typically 1700:1) radio maps of 15 X-ray BL Lac (XBL) objects from the HEAO-1 Large Area Sky Survey are presented. Morphological characteristics of these sources are compared with Fanaroff-Riley (FR) class I radio galaxies in the context of unified schemes, with reference to one-sided kiloparsec-scale emission. Evidence that cluster membership of XBLs is significantly higher than previously thought is also presented. It is shown that the extended radio powers, X-ray emission, core-to-lobe ratios, and linear sizes of the radio selected BL Lac (RBL) and XBL populations are consistent with an FR I radio galaxy parent population. A source list and VLA observing log and map parameters are provided.

Laurent-Muehleisen, S. A.↗

NASA NTRS1992

VLA studies of X-ray selected BL Lacertae objects

Observations of 13 X-ray selected BL Lacertae objects (X-BL Lacs) from the HEAO-1 Large Area Sky Survey have been obtained with the Very Large Array. These X-BL Lacs are Fanaroff-Riley I radio sources, and are less core-dominated than traditional radio selected BL Lacs (R-BL Lacs). The radio properties are consistent with a 'unified scheme' connecting BL Lacs with FR I radio galaxies, where X-BL Lacs are oriented at larger angles to the line-of-sight than R-BL Lacs. However, the X-ray emission does not appear to be as strongly relativistically beamed as the radio and may be completely unbeamed.

Kollgaard, R. I.↗