Volume 407, Number 2, August IV 2003
|Page(s)||503 - 513|
|Published online||17 November 2003|
Chandra observations of the X-ray environment of BL Lacs
George Mason University, School of Computational Sciences, 4400 University Drive, Fairfax, VA 22030, USA
2 George Mason University, Dept. of Physics & Astronomy, MS 3F3, 4400 University Drive, Fairfax, VA 22030, USA
3 Eureka Scientific
Corresponding author: D. Donato, email@example.com
Accepted: 13 May 2003
We present Chandra observations of the X-ray environment of a sample of 6 BL Lacertae objects. The improved sensitivity of the ACIS experiment allows us to separate the core X-ray emission from the contribution of diffuse emission from the host galaxy/cluster scales. Within the short (2–6 ks) ACIS exposures, we find evidence for diffuse X-ray emission in 3 sources (BL Lac, PKS 0548–322, and PKS 2005–489). The diffuse emission can be modeled with a King profile with , core radii kpc, and 0.4–5 keV luminosities in the range erg s-1. In the remaining 3 sources, one (3C 371) has a radial profile entirely consistent with an unresolved source, while two (1ES 2344+514 and 1ES 2321+419) show evidence for weak diffuse emission on kpc scales. These results support current models for radio-loud AGN unifying BL Lacs and FRI radio galaxies through the orientation of their jets. In PKS 0548–322 and PKS 2005–489, we also find evidence for diffuse emission on cluster scales, although the spatial properties of this emission are not constrained. The temperature ( keV) and luminosity ( erg s-1) of the cluster gas are typical of normal clusters. Interestingly, these are the two brightest sources of the sample, suggesting a link between environment and nuclear activity.
Key words: galaxies: active / galaxies: fundamental parameters / galaxies: nuclei / X-rays: galaxies
© ESO, 2003
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