An XMM-Newton look at the strongly variable radio-weak BL Lac Fermi J1544-0639

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dc.contributor.authorUrsini, F.
dc.contributor.authorBassani, L.
dc.contributor.authorPanessa, F.
dc.contributor.authorPian, E.
dc.contributor.authorBruni, G.
dc.contributor.authorBazzano, A.
dc.contributor.authorMasetti, N.
dc.contributor.authorSokolovsky, K.
dc.contributor.authorUbertini, P.
dc.date.accessioned2023-07-27T16:06:49Z
dc.date.available2023-07-27T16:06:49Z
dc.date.issued2019-02-01
dc.descriptionIndexación Scopuses
dc.description.abstractContext. Fermi J1544-0639/ASASSN-17gs/AT2017egv was identified as a gamma-ray/optical transient on May 15, 2017. Subsequent multiwavelength observations suggest that this source may belong to the new class of radio-weak BL Lacs. Aims. We studied the X-ray spectral properties and short-term variability of Fermi J1544-0639 to constrain the X-ray continuum emission mechanism of this peculiar source. Methods. We present the analysis of an XMM-Newton observation, 56 ks in length, performed on February 21, 2018. Results. The source exhibits strong X-ray variability, both in flux and spectral shape, on timescales of ∼10 ks, with a harder-when-brighter behaviour typical of BL Lacs. The X-ray spectrum is nicely described by a variable broken power law, with a break energy of around 2.7 keV consistent with radiative cooling due to Comptonization of broad-line region photons. We find evidence for a "soft excess", nicely described by a blackbody with a temperature of ∼0.2 keV, consistent with being produced by bulk Comptonization along the jet.es
dc.identifier.citationAstronomy and Astrophysics Volume 622 1 February 2019 Article number A116es
dc.identifier.doi10.1051/0004-6361/201834662en
dc.identifier.issn0004-6361
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/52059
dc.language.isoenes
dc.publisherAstronomy and Astrophysicses
dc.rights.licenseAtribución 4.0 Internacional (CC BY 4.0)en
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/deed.esen
dc.subjectBL Lacertae objects: generales
dc.subjectQuasars: generales
dc.subjectRadiation mechanisms: non-thermales
dc.subjectX-rays: galaxieses
dc.titleAn XMM-Newton look at the strongly variable radio-weak BL Lac Fermi J1544-0639es
dc.typeArtículoes
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