2XMMp clusters in the SDSS
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2XMMp clusters in the SDSS
Georg Lamer
Axel Schwope
Jan Kohnert
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Extended sources in 2XMMp
• Total extended sources: 6271• Selections:
– offax > 4 arcmin, all EPIC full frame– abs (bII) > 20o , ext_ml > 5
• Remaining: 2136 • In SDSS DR5 footprint: 867• Unique: 569• After visual screening: 411
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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
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Correlation with SDSS
Spectroscopic z = 0.223
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Correlation with SDSS
photometric < z > = 0.38 (11 galaxies)
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Results
• Sources investigated: 411
• No SDSS products: 12
• Spectroscopic redshifts: 116
• Photometric redshifts: 131
• Total SDSS redshifts: 247
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photo-z / spectroscopic z
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BCG colours
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X-ray luminosities
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Hardness ratios
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Redshift distribution
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Effects of large scale structure?
0.2
0.4
z
R.A.
120O
180O
240O