Tomo GOTO z>7 QSOs and 1.25 7 QSOs and 1.25
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Transcript of Tomo GOTO z>7 QSOs and 1.25 7 QSOs and 1.25
- z>7 QSOs and 1.25
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Why z>7 QSOs are important?
Tomo GOTO
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Why z>7 QSOs are important?QSO/AGN evolution (LF/number evolution, why metallicity so high?)Formation of super massive black holes(Can a black hole of billion Msun be formed in 1 Gyr?)Direct probe of re-ionization of the Universe
Tomo GOTO
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Reionization of the Universe(Jelle Ritzerveld & Rien van de Weijgaert & Vincent Icke) When and how our Universe reionized?One of the outstanding questions on observational cosmology.
Tomo GOTO
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Reionization through QSOIonized bubblesGalaxy continuum is too faint. LF is indirect, depends on evolution, dust, modeletc.GRBs disappear too quickly.Neutral Hydrogen
Tomo GOTO
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Current status of high-z QSO surveys
Tomo GOTO
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High-z QSO surveys in the pastComplete Gunn-Peterson troughRemaining flux(White et al. 2003,AJ,126,1)Reionization depends line-of-sight
The resolution of these questions will have to wait for the discovery of additional z>6 quasars. (Richard L. White)
=6.28z=6.28z=6.42
Tomo GOTO
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Japan/Subaru has been contributing:A new QSO at z=5.96 MAB,1450 = 26.9 (H0 = 50 km s 1 Mpc 1, q0 = 0.5).
Ly + Nv Ly + Oviz=5.96Goto T., 2006, MNRAS,371,769
Tomo GOTO
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Japan/Subaru has been contributing:z=6.06 (Goto in prep.)
Tomo GOTO
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Japan/Subaru has been contributing:
Ly at 9246 most distant QSO at z=6.6?No questions on this slide please (not published yet).
Tomo GOTO
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How do we make progress?
Tomo GOTO
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How do we find such QSOsWe need to go redder, wider and deeper.perfect for the HSC/WFMOS1.z=6.4 is the limit of optical surveysnear IR large survey for z>7. HSC y-band2. Deeper survey for fainter QSO-spatial dependence of reionization, -break of the LF, QSO evolution-contribution to the reionizationLimitations of the current surveys:
Tomo GOTO
- z=6.4 is the limit of optical surveys Redder: HSC Y-band can find 6.8
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Wider & DeeperQSO density is very small.Only 20 z=6 QSOs in 6000sq.deg We need to go wide.QSO LF is very steep. We need to go deep.
8x10-10@z=6, 2x10-10@z=7, 7x10-11@z=8HSC/WFMOS can do both!
Tomo GOTO
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z=7 QSO selectiony-JAsamiQSOz6 QSO selection: i-z-yMethod:color selection(HSC)id spectroscopy(WFMOS)
Tomo GOTO
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Expected results
Tomo GOTO
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Estimates @ 5.84000 QSOs @z=6(imag is the limit here.)
Escaping flux correlation function. Spatial fluctuation of the reionization (note only 800 for GP-test to z
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Estimates @ 6.890 QSOs @z=7 (depth, especially in Z wins here.)Complete GP-trough at any direction
Tomo GOTO
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How many WFMOS fibers?Z6spectroscopy success rate 15%(Fan+ 2001Goto 2005).4000 QSOs (26000spectra) in 2000sq.deg, 13 fibers/sq.deg.Z7for 90 QSOs (600 spectra) in 2000sq.deg.only 0.3 fibers/sq.deg. Easy to be part of the WFMOS survey.
WFMOS CCDs needs to be red sensitive.
Tomo GOTO
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QSO: SummaryWith 0.3(13)/deg2 WFMOS fiber for z7(6)depth: I=25.8(15min), z=24.9AB(20min), Y=23.7AB(25min) area:2000 sq.deg HSC/WFMOS can find90 QSOs Z7. 0.3/deg2 WFMOS fibers Complete GP-trough at any direction4000 QSOs z6. 13/deg2 WFMOS fibers first spatial variation of reionization, LF, density to M=22mag
Tomo GOTO
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Why galaxy cluster search with the HSC/WFMOS?1.missing link in cluster galaxy evolution
2. estimating wTomo GOTO (Ifa, Univ. of Hawaii)Masamune Ooguri(Stanford)
Tomo GOTO
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z>2.1 (proto) clusters are groups of star-forming galaxies (Lya emitters, LBG),very different from low-z red-sequence clusters.proto-cluster@z=4.11 red, dead cluster@z=0.1Reason: selection effect.4000A break selected vs Lya/LBG selectedEvolutionary path unknown
Tomo GOTO
- missing link:What are 1
- z-band was the limit for the 4000A break search (z
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1.SDSS Data3.Enhance 4.DetectionSDSS Cut&Enhance Galaxy Cluster Catalog (Goto et al.2002, AJ, 123, 1801)2.Color cutsFor 34 color cuts.5.Cluster catalogRADEC
Tomo GOTO
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Waldo is obvious after color-cut
Tomo GOTO
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color-cut works: Newly discovered clusters with the SDSS(Goto et al.2002, AJ, 123, 1801Goto, 2005,MNRAS, 359,1415,)This cluster finder can be easily adopted to HSC z-Y.
Tomo GOTO
- AKARI (the first Japanese IR satellite)is finding 0.9
- Purpose 2: estimating w.By revealing cluster mass function at 1.25
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Oguri
Tomo GOTO
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Is cluster count still useful in WMAP era?
Independent estimate on m
Statistical error is comparable to WMAP
higher z than weak lensing
Tomo GOTO
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Tight correlation:
optical richness vs cluster mass.Reyes etal. 2008
Tomo GOTO
- Survey design and expected resultsDesignz=24.9AB(20min), Y=23.7AB(25min) area:2000 sq.deg expected resultsVolume=4x109 Mpc3 at 1.25
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How many WFMOS fibers?105 clusters in 2000sq.deg.25 fibers/deg2. Can be part of the WFMOS survey.
Tomo GOTO
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Summary
Tomo GOTO
- SummaryWorking with the HSC, WFMOS can find:Clusters: 105 clusters at 1
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Tomo GOTO