Volume 538, February 2012
|Number of page(s)||9|
|Section||Catalogs and data|
|Published online||30 January 2012|
The ROSAT-ESO flux limited X-ray galaxy cluster survey (REFLEX II)⋆
I. Newly identified X-ray luminous clusters at z ≥ 0.2
Max-Planck-Institut für extraterrestrische Physik, 85748 Garching, Germany
Received: 1 September 2011
Accepted: 22 November 2011
We report 19 intermediate redshift clusters newly detected in the ROSAT All-Sky survey that are spectroscopically confirmed. They form a part of 911 objects in the REFLEX II cluster catalogue with a limiting flux of 1.8 × 10-12 erg/s/cm2 in the 0.1–2.4 keV ROSAT band at redshift z ≥ 0.2. In addition we report three clusters from the REFLEX III supplementary catalogue, which contains objects below the REFLEX II flux limit but satisfies the redshift constraint above. These clusters are spectroscopically followed-up by our ESO NTT-EFOSC2 campaigns for the redshift measurement. We describe our observing and data reduction methods. We show how X-ray properties such as spectral hardness ratio and source extent can be used as important diagnostics in selecting galaxy cluster candidates. Physical properties of the clusters are subsequently calculated from the X-ray observations. This sample contains the high mass and intermediate-redshift galaxy clusters for astrophysical and cosmological applications.
Key words: X-rays: galaxies: clusters / galaxies: clusters: general / galaxies: distances and redshifts
© ESO, 2012
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.