2XMMp clusters in the SDSS
-
Upload
brandon-nieves -
Category
Documents
-
view
24 -
download
3
description
Transcript of 2XMMp clusters in the SDSS
2XMMp clusters in the SDSS
Georg Lamer
Axel Schwope
Jan Kohnert
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
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
Correlation with SDSS
Spectroscopic z = 0.223
Correlation with SDSS
photometric < z > = 0.38 (11 galaxies)
Results
• Sources investigated: 411
• No SDSS products: 12
• Spectroscopic redshifts: 116
• Photometric redshifts: 131
• Total SDSS redshifts: 247
photo-z / spectroscopic z
BCG colours
X-ray luminosities
Hardness ratios
Redshift distribution
Effects of large scale structure?
0.2
0.4
z
R.A.
120O
180O
240O