2XMMp clusters in the SDSS

1
2XMMp clusters in the SDSS

• Georg Lamer
• Axel Schwope
• Jan Kohnert

2
Extended sources in 2XMMp

• Total extended sources 6271
• Selections
• offax gt 4 arcmin, all EPIC full frame
• abs (bII) gt 20o , ext_ml gt 5
• Remaining 2136
• In SDSS DR5 footprint 867
• Unique 569
• After visual screening 411

3
Correlation with SDSS

• Select SDSS galaxies within 1 arcmin of 411 X-ray
  positions
• photometry (ugriz), photometric redshifts
• spectra, spectroscopic redshifts
• colour thumbnail images
• Visual inspection of images, spectroscopic and
  photoscopic redshifts

4
Correlation with SDSS

• Spectroscopic z 0.223

5
Correlation with SDSS

• photometric lt z gt 0.38 (11 galaxies)

6
Results

• Sources investigated 411
• No SDSS products 12
• Spectroscopic redshifts 116
• Photometric redshifts 131
• Total SDSS redshifts 247

7
photo-z / spectroscopic z
8
BCG colours
9
X-ray luminosities
10
Hardness ratios
11
Redshift distribution
12
Effects of large scale structure?