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Artículo

The gamma-ray sky seen at X-ray energies. I. Searching for the connection between X-ray and gamma-rays in Fermi BL Lac objects

Marchesini, Ezequiel JoaquínIcon ; Paggi, A.; Massaro, F.; Masetti, N.; D'Abrusco, R.; Andruchow, IleanaIcon ; de Menezes, R.
Fecha de publicación: 10/2019
Editorial: EDP Sciences
Revista: Astronomy and Astrophysics
ISSN: 0004-6361
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Astronomía

Resumen

Context. BL Lac objects are an extreme type of active galactic nuclei (AGNs) that belong to the largest population of γ-ray sources: blazars. This class of AGNs shows a double-bumped spectral energy distribution that is commonly described in terms of a synchrotron self-Compton (SSC) emission process, whereas the low-energy component that dominates their emission between the infrared and the X-ray band is tightly connected to the high-energy component that peaks in the γ-rays. Two strong connections that link radio and mid-infrared emission of blazars to the emission in the γ-ray band are well established. They constitute the basis for associating γ-ray sources with their low-energy counterparts.Aims. We searched for a possible link between X-ray and γ-ray emissions for the subclass of BL Lacs using all archival Swift/XRT observations combined with Fermi data for a selected sample of 351 sources.Methods. Analyzing ∼2400 ks of Swift/XRT observations that were carried out until December 2018, we discovered that above the γ-ray flux threshold Fγ ≈ 3 × 10−12 erg cm−2 s−1 , 96% of all Fermi BL Lacs have an X-ray counterpart that is detected with signal-to-noise ratio higher than 3.Results. We did not find any correlation or clear trend between X-ray and γ-ray fluxes and/or spectral shapes, but we discovered a correlation between the X-ray flux and the mid-infrared color. Finally, we discuss on a possible interpretation of our results in the SSC framework.
Palabras clave: BL LACERTAE OBJECTSS: GENRAL , X-RAYS: GALAXIES , GAMMA RAYS: GALAXIES , GALAXIES:ACTIVE , GALAXIES: JETS
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/137870
URL: https://www.aanda.org/10.1051/0004-6361/201936285
DOI: https://doi.org/10.1051/0004-6361/201936285
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Articulos(IALP)
Articulos de INST.DE ASTROFISICA LA PLATA
Citación
Marchesini, Ezequiel Joaquín; Paggi, A.; Massaro, F.; Masetti, N.; D'Abrusco, R.; et al.; The gamma-ray sky seen at X-ray energies. I. Searching for the connection between X-ray and gamma-rays in Fermi BL Lac objects; EDP Sciences; Astronomy and Astrophysics; 631; A150; 10-2019; 1-12
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