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          Institute: MPI für Kernphysik     Collection: High-Energy Astrophysics     Display Documents

ID: 56181.0, MPI für Kernphysik / High-Energy Astrophysics
BeppoSAX observations of 1-Jy BL Lacertae objects - II.
Authors:Padovani, P.; Costamante, L.; Giommi, P.; Ghisellini, G.; Celotti, A.; Wolter, A.
Date of Publication (YYYY-MM-DD):2004-02
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:MNRAS
Issue / Number:4
Start Page:1282
End Page:1293
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present new BeppoSAX LECS and MECS observations, covering the energy range 0.1 - 10 keV (observer's frame), of four BL Lacertae objects selected from the 1 Jy sample. All sources display a flat (alpha_x ~ 0.7) X-ray spectrum, which we interpret as inverse Compton emission. One object shows evidence for a low-energy steepening (Delta alpha_x ~ 0.9) which is likely due to the synchrotron component merging into the inverse Compton one around ~ 2 keV. A variable synchrotron tail would explain why the ROSAT spectra of our sources are typically steeper than the BeppoSAX ones (Delta alpha_x} ~ 0.7). The broad-band spectral energy distributions fully confirm this picture and model fits using a synchrotron inverse Compton model allow us to derive the physical parameters (intrinsic power, magnetic field, etc.) of our sources. By combining the results of this paper with those previously obtained on other sources we present a detailed study of the BeppoSAX properties of a well-defined sub-sample of 14 X-ray bright (f_x (0.1 - 10 keV) > 3 x 10^{-12} erg/cm^2/s) 1-Jy BL Lacs. We find a very tight proportionality between nearly simultaneous radio and X-ray powers for the 1-Jy sources in which the X-ray band is dominated by inverse Compton emission, which points to a strong link between X-ray and radio emission components in these objects.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group H. J. Völk/High Energy Astrophysics (F. Aharonian)
External Affiliations:Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA 2Università degli Studi di Milano, Via Celoria 16, I-20133 Milano, Italy 3ASI Science Data Center, ASDC, c/o ESRIN, Via G. Galilei, I-00044 Frascati, Italy 4Osservatorio Astronomico di Brera, Via Bianchi 46, I-23807 Merate, Italy 5SISSA, via Beirut 24, I-34014 Trieste, Italy 6Osservatorio Astronomico di Brera, Via Brera 28, I-20121 Milano, Italy
Identifiers:URL:http://de.arxiv.org/abs/astro-ph/0311084 [Preprint version of this paper available on arXiv]
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