Issue |
A&A
Volume 399, Number 2, February IV 2003
|
|
---|---|---|
Page(s) | 497 - 504 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20021775 | |
Published online | 07 February 2003 |
High resolution soft X-ray spectroscopy of the elliptical galaxy NGC 5044
Results from the reflection grating spectrometer on-board XMM-Newton
1
SRON National Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Nether lands
2
Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
Corresponding author: T. Tamura, T.Tamura@sron.nl
Received:
28
August
2002
Accepted:
27
November
2002
The results from an X-ray spectroscopic study of the giant elliptical galaxy NGC 5044 in the center of a galaxy group are presented.
The line dominated soft X-ray spectra (mainly Fe-L and
) 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´ (~20 kpc) in full-width can be described
by a two temperature plasma model of 0.7 keV and 1.1 keV.
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
keV.
Furthermore, the Fe and O abundances within the central 10–20 kpc in radius are accurately measured to be
and
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.
Key words: galaxies: individual: NGC 5044 / galaxies: clusters: general / galaxies: abundances / X-rays: galaxies: clusters
© ESO, 2003
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