Volume 374, Number 1, July IV 2001
|Page(s)||66 - 72|
|Section||Cosmology (including clusters of galaxies)|
|Published online||15 July 2001|
Discovery of an absorbed cluster of galaxies (XMMU J183225.4-103645) close to the Galactic plane with XMM-Newton
Astrophysics Division, Space Science Department of ESA, ESTEC, Postbus 299, 2200 AG Noordwijk, The Netherlands
2 Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK
Corresponding author: J. Nevalainen, email@example.com
Accepted: 3 May 2001
During an XMM-Newton observation of the galactic supernova remnant G21.5-09 a bright, previously uncatalogued, source (XMMU J183225.4-103645) was detected 18´from G21.5-09. The European Photon Imaging Camera data inside 1´(180 kpc) radius are consistent with a source at a redshift of with an optically thin thermal spectrum of temperature keV and a metal abundance of solar. This model gives a 2-10 keV luminosity of erg s-1. These characteristics, as well as the source extent of 20 (350 kpc), and the surface brightness profile are consistent with emission from the central region of a moderately rich cluster containing a cooling flow with mass flow rate of - yr-1. The absorption is atom cm-2, 5 times that inferred from low-resolution HI data but consistent with higher spatial resolution infrared dust extinction estimates. XMMU J183225.4-103645 is not visible in earlier ROSAT observations due to high amount of absorption. This discovery demonstrates the capability of XMM-Newton to map the cluster distribution close to the Galactic plane, where few such systems are known. The ability of XMM-Newton to determine cluster redshifts to 1% precision at is especially important in optically crowded and absorbed fields such as close to the Galactic plane, where the optical redshift measurements of galaxies are difficult.
Key words: galaxies: clusters: individual: XMMU J183225.4 / 103645 / galaxies: intergalactic medium / X-rays: galaxies: clusters
© ESO, 2001
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.