Details

Autor(en) / Beteiligte

• Sanders, J. S.
• Fabian, A. C.

Titel

Velocity width measurements of the coolest X-ray emitting material in the cores of clusters, groups and elliptical galaxies

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 2013-03, Vol.429 (3), p.2727-2738

Ort / Verlag

London: Oxford University Press

Erscheinungsjahr

2013

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We examine the velocity width of cool X-ray emitting material using XMM-Newton Reflection Grating Spectrometer (RGS) spectra of a sample of clusters and group of galaxies and elliptical galaxies. Improving on our previous analyses, we apply a spectral model which accounts for broadening due to the spatial extent of the source. With both conventional and Markov Chain Monte Carlo approaches we obtain limits, or in a few cases measurements, of the velocity broadening of the coolest X-ray material. In our sample, we include new observations targeting objects with compact, bright, line-rich cores. One of these, MACS J2229.7−2755, gives a velocity limit of at the 90 per cent confidence level. Other systems with limits close to include A 1835, NGC 4261 and NGC 4472. For more than a third of the targets we find limits better than . HCG 62, NGC 1399 and A 3112 show evidence for velocity broadening. For a smaller sample of objects, we use continuum-subtracted emission line surface brightness profiles to account for the spatial broadening. Although there are significant systematic errors associated with the technique ( ), we find broadening at the level of 280 to in A 3112, NGC 1399 and NGC 4636.