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  Synchrotron X-ray Emission from Flat-spectrum Radio Quasars

Padovani, P., Costamante, L., Ghisellini, G., Giommi, P., & Perlman, E. (2003). Synchrotron X-ray Emission from Flat-spectrum Radio Quasars. In L. O. Takalo, & E. Valtaoja (Eds.), High Energy Blazar Astronomy, ASP Conference Proceedings. San Francisco: Astronomical Society of the Pacific.

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Datensatz-Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-8E87-B Versions-Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-8E88-9
Genre: Konferenzbeitrag

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 Urheber:
Padovani, P., Autor
Costamante, L.1, Autor           
Ghisellini, G., Autor
Giommi, P., Autor
Perlman, E., Autor
Affiliations:
1Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society, ou_904550              

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Schlagwörter: -
 Zusammenfassung: We present new BeppoSAX observations of four flat-spectrum radio quasars (FSRQ) with spectral energy distributions similar to those of high-energy peaked BL Lacs. In one of our sources the BeppoSAX band is dominated by synchrotron emission peaking at ∼ 2 × 1016 Hz, as also shown by its steep (energy index αx ∼ 1.5) spectrum. This makes this object the first known FSRQ whose X-ray emission is not due to inverse Compton radiation. Two other sources display a flat X-ray spectrum (αx ∼ 0.7) but with indications of steepening at low energies. In these objects, the combination of BeppoSAX and ROSAT observations, (non-simultaneous) multifrequency data, and a synchrotron inverse Compton model suggest synchrotron peak frequencies ≈ 1015 Hz, although a better coverage of the spectral energy distributions is needed to provide firmer values. Our sources, although firmly in the radio--loud regime, have powers more typical of high--energy peaked BL Lacs than of FSRQ, and indeed their radio powers put them near the low--luminosity end of the FSRQ luminosity function. We discuss this in terms of an anti-correlation between synchrotron peak frequency and total power, based on physical arguments, and also as possibly due to a selection effect.

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Sprache(n): eng - English
 Datum: 2003-07
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: eDoc: 205962
 Art des Abschluß: -

Veranstaltung

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Titel: High Energy Blazar Astronomy
Veranstaltungsort: Piikkio, Finland
Start-/Enddatum: 2002-06-17 - 2002-06-21

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Titel: High Energy Blazar Astronomy, ASP Conference Proceedings
Genre der Quelle: Konferenzband
 Urheber:
Takalo, Leo O., Herausgeber
Valtaoja, Esko, Herausgeber
Affiliations:
-
Ort, Verlag, Ausgabe: San Francisco : Astronomical Society of the Pacific
Seiten: - Band / Heft: - Artikelnummer: - Start- / Endseite: - Identifikator: ISBN: 1-58381-146-X