tracing the accretion history of the universe by stacking x-rays from red galaxies in the ndwfs
DESCRIPTION
Tracing the Accretion History of the Universe by stacking X-rays from Red Galaxies in the NDWFS. Kate Brand, NOAO, Tucson - PowerPoint PPT PresentationTRANSCRIPT
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Tracing the Accretion History of the Universe by stacking X-rays from
Red Galaxies in the NDWFS
Kate Brand, NOAO, Tucson A. Dey, B. Jannuzi, M. Brown, J. Najita, C. Kochanek, C. Watson, D. Fabricant, G. Fazio, W. Forman, P. Green, C. Jones, A. Kenter,
S. Murray, A. Vikhlinin, B. McNamara, J. Shields, M. Rieke
AAS, Denver, June 2004
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The NDWFS / XBoÖtes fields
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Summary
• Stacking analysis of X-rays from optically selected galaxies to determine mean X-ray properties and how this evolves.
• Wide field / deep multi-band optical data
• AGN / star formation.
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The NDWFS red galaxy population (Brown et al. 2003)
3316 red galaxies in 1.4 deg2 region selected by model SED fitting to photometric dataPhotometric redshifts, z= 0.3-0.9Same evolution corrected absolute magnitude distribution over all redshifts (MR < -20.5) -> tracing same population
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The stacked X-ray images
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Evolution of X-ray Luminosity with Redshift
SOFT
HARD TOTAL
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Future Work
• The full 9 deg2 -> ~ 7 x number of objects -> better number statistics-Smaller errors-Divide population into sub-populations-Mean X-ray spectra-Bimodality in number counts• Stacking of X-rays in different optical populations - AGN / Star formation• Multi-wavelength data - deep radio / FIR - star formation rates
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Extraction radius / off-axis distance
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Results
Redshift No. galaxies
X-ray Counts (bkgd)
X-ray Flux (bkgd)
10-16 ergs cm-2 s-1
X-ray Luminosity
1042 ergs s-1
0.3-0.5 0.5-10keV
0.5-2keV
2-10keV
1040 149 (26.5)
73 (10.5)
76 (16.0)
2.87±0.23 (0.51)
0.64±0.08 (0.09)
3.80±0.43 (0.80)
0.12 ± 0.01
0.028 ± 0.004
0.15 ± 0.02
0.5-0.7 0.5-10keV
0.5-2keV
2-10keV
1271 116 (32.25)
52 (13.25)
64 (19.0)
1.83±0.17 (0.51)
0.37±0.05 (0.09)
2.62±0.32 (0.77)
0.17 ± 0.02
0.036 ± 0.007
0.24 ± 0.05
0.7-0.9 0.5-10keV
0.5-2keV
2-10keV
1005 95 (30.75)
53 (12.5)
42 (18.25)
1.89±0.19 (0.61)
0.48±0.07 (0.11)
2.17±0.34 (0.94)
0.32 ± 0.06
0.093 ± 0.019
0.31 ± 0.10
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Number counts
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Tau distribution
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MR distribution