Broad band properties of medium and low Lx/Lb Early Type Galaxies

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dc.creatorTrinchieri, G.
dc.creatorPellegrini, S.
dc.creatorWolter, A.
dc.creatorFabbiano, G.
dc.creatorFiore, F.
dc.date2000-10-12
dc.date.accessioned2026-07-07T01:55:57Z
dc.date.available2026-07-07T01:55:57Z
dc.descriptionWe have measured the spectral properties of five galaxies of low to intermediate Lx/Lb ratios with BeppoSAX and ASCA. A hard component (kT ~4-10 keV) is observed in all galaxies. In NGC1553 the BeppoSAX data show that this component is extended, and suggest an origin for the emission in the evolved stellar population. In NGC3115, a point-like source appears embedded in an extended component morphologically similar to the stellar body, suggesting an almost equal contribution from the nuclear region and the binary population. A large central mass concentration and low level optical activity in NGC3379 argue for a contribution from the nucleus also in this object. However, for both NGC3115 and NGC3379 the nuclear emission is at a level well below that observed in other galaxies who host similar nuclear black holes. A second soft (kT ~0.3-0.7 keV) spectral component is needed to fit the data of NGC1407, NGC1553 and NGC4125 over the entire energy range probed (about 0.2-10 keV), best represented by a thermal component with line emission. We discuss possible interpretations of the origin of this component, which however will be better defined only with higher quality data.
dc.descriptionAccepted for publication in A&A, main journal
dc.identifierhttps://arxiv.org/abs/astro-ph/0010234
dc.identifierhttp://arxiv.org/abs/astro-ph/0010234
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/1830
dc.subjectAstrophysics
dc.titleBroad band properties of medium and low Lx/Lb Early Type Galaxies
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