High resolution soft X-ray spectroscopy of the elliptical galaxy NGC 5044. Results from the reflection grating spectrometer on-board XMM-Newton

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dc.creatorTamura, T.
dc.creatorKaastra, J. S.
dc.creatorMakishima, K.
dc.creatorTakahashi, I.
dc.date2002-11-27
dc.date.accessioned2026-07-07T10:31:30Z
dc.date.available2026-07-07T10:31:30Z
dc.descriptionThe results from an X-ray spectroscopic study of the giant elliptical galaxy NGC5044 in the center of a galaxy group are presented. The line dominated soft X-ray spectra (mainly Fe-L and O VIII Ly_a) from the diffuse gas are resolved for the first time in this system with the Reflection Grating Spectrometers on-board XMM-Newton and provide a strong constraint on the temperature structure. The spectra integrated over 2' (\sim 20kpc) in full-width can be described by a two temperature plasma model of 0.7keV and 1.1keV. Most of the latter component is consistent with originating from off-center regions. Compared to the isobaric cooling flow prediction, the observation shows a clear cut-off below a temperature of 0.6 +-0.1keV. Furthermore, the Fe and O abundances within the central 10--20kpc in radius are accurately measured to be 0.55+-0.05 and 0.25+-0.1 times the solar ratios, respectively. The observed cut-off temperature of this galaxy and other central galaxies in galaxy groups and clusters are compared with the scale of the galaxy and properties of the surrounding intra-cluster medium. Based on this comparison, the origin of the lack of predicted cool emission is discussed.
dc.descriptionAccepted for publication in Astronomy & Astrophysics
dc.identifierhttps://arxiv.org/abs/astro-ph/0211603
dc.identifierhttp://arxiv.org/abs/astro-ph/0211603
dc.identifierAstron.Astrophys.399:497-504,2003
dc.identifierdoi:10.1051/0004-6361:20021775
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/178429
dc.subjectAstrophysics
dc.titleHigh resolution soft X-ray spectroscopy of the elliptical galaxy NGC 5044. Results from the reflection grating spectrometer on-board XMM-Newton
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