discussion of ideas building a winning proposal

e-BOSS: Extending BOSS
discussion of ideas
building a winning proposal
Jean-Paul Kneib (LAM)
1
vendredi 24 juin 2011
e-BOSS ideas
• a ~4-year cosmology project that pushes the reach of the
•
•
Sloan Telescope to map the LSS beyond z=0.6:
• probe 0.6<z<~1 with Emission-Line-Galaxies (ELG)
• probe 1<z<~2 with QSOs
• increase the sample of z>2.2 QSOs for Ly-forest survey
provide new competitive BAO Dark Energy constraints in
the 0.6<z<2 range using ELGs and Quasars as tracers:
• double the signal in the Ly-alpha forest compared to BOSS
• a factor of ~2+ improvement in DETF-FOM compared to BOSS.
provide a wealth of ancillary sciences:
• Galaxy & Quasars science
• Lensing (photo-z calibration and tracing the structures)
• Multi-wavelength science using synergy with other very wide field survey
Jean-Paul Kneib - eBOSS - LBL - June, 24th 2011
vendredi 24 juin 2011
2
eBOSS opportunity
•
A great opportunity to:
LSS from z~0.6 to z~3 extending BOSS, providing
‣ map
new cosmological constraints at z>0.6
use of the powerful BOSS spectrograph (working
‣ make
spectrograph with the largest multiplexing - just need
adequate targets density!)
Sloan Telescope very productive & maintain legacy
‣ keep
in cosmological surveys from SDSS/BOSS community
us ready for future survey: BigBOSS/EUCLID/
‣ Get
WFIRST ...
Jean-Paul Kneib - eBOSS - LBL - June, 24th 2011
vendredi 24 juin 2011
3
e-BOSS LSS mapping
QSOs
ELGs
BOSS
vendredi 24 juin 2011
Jean-Paul Kneib - eBOSS - LBL - June, 24th 2011
from Anze Slozar
Examples of BOSS spectra for
ELGs and QSOs
ELGs and QSOs have strong emission lines that make the redshift
identification very efficient, down to the photometry limit of DR8.
z= 1.79477
SiIV
CIV
CIII]
z= 2.00803
CII]
MgII
Ly!
SiIV
CIV
CIII]
z= 1.49553
CIV
CIII]
CII]
z= 1.66239
MgII
SiIVCIV
CIII]
CII]
z= 1.00481
CIII]
4000
CII]
5000
MgII
Jean-Paul Kneib - eBOSS - LBL - June, 24th 2011
vendredi 24 juin 2011
MgII
z= 1.39984
NeV
6000
CII]
[OII]NeIII
CIV
CIII]
7000
8000 4000
5000
Observed Frame Wavelength (Å)
CII]
MgII
6000
7000
NeV
8000
5
Some examples of z>1 [OII] emitters from BOSS data
z=1.488
z=1.487
z=1.434
Jean-Paul Kneib - eBOSS - LBL - June, 24th 2011
vendredi 24 juin 2011
z=1.622 !!!
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e-BOSS numbers
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Area coverage:
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[A] at maximum, the BOSS footprint (~10k square degrees) using DR8 photometry
(g<23) => ~1 plate per position for a ~4 year survey (probe 150 targets/sqdeg)
•
but could also focus on less compact ~2-5k sq.degrees on deeper areas, allowing repeat
observations on some targets (Ly-alpha QSOs, hi-z LRGs, time-variability spectroscopy), and
observation of close objects closer than the fiber collision limit (galaxy pairs, galaxy
members in a cluster, galaxy-quasar close pairs ...)
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•
[B] ~5k => ~2 visit per position (probe ~300 targets/sqdeg)
[C] ~3.3k => ~3(4) visit per position (probe ~450 targets/sqdeg)
Duration:
•
About 4 year to obtain the redshift of a large number of objects: Aim is to reach up to
~1.5 to 2 million objects [Wiggle-z has done ~1000 sq.deg, ~0.25 Million ELGs - we
need to do better!]
•
Finish before new facility really start! (BigBOSS, PFS, any space mission)
Jean-Paul Kneib - eBOSS - LBL - June, 24th 2011
vendredi 24 juin 2011
7
e-BOSS targets
•
Case [A] (~10k sq.deg/150 targets/sqdeg) DR8 photometry is
enough(g<22.5) no real need for other photometric data
•
Case [B] (~5k sq.deg/300 targets/sqdeg) => 2 visit per position
(probe ~300 target/sqdeg), DR8 should be just OK, deeper
data would help!
•
Case [C] 3.3k => ~3(4) visit per position (probe ~450 target/
sqdeg), DR8 is not enough, need deeper data: DES, HSC,VST/
KIDS - could also benefit from u-band survey: SGCUSS,
WIRO?, CFHT? HSC?
Jean-Paul Kneib - eBOSS - LBL - June, 24th 2011
vendredi 24 juin 2011
8
e-BOSS targets
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ELGs: see Johan’s talk for different selections ugr vs. gri
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AGN from follow-up of eROSITA/Herschel(?) ~10 agn/sqdeg
(first year of eROSITA data)
QSOs: see Christophe’s talk
z~0.8 LRGs from WISE ?? (to be explored)
Clusters BCGs/LRGs from follow-up of X-ray/SZ experiments:
~a few gal/sqdeg
Jean-Paul Kneib - eBOSS - LBL - June, 24th 2011
vendredi 24 juin 2011
9
e-BOSS imaging data
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DR8: 10k sqdeg
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VST/KIDS: 750 sq.deg on the Equator NGC (should be publicly accessible on
some form by mid-2014) - no repeat strategy
•
HSC: 2000 sq.deg on the equator ~1500 sq.deg on NGC, ~500 sqdeg on SGC?
(access?)
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SGCUSS: 3000 sqdeg on SGC to U<23 (access?)
•
WIRO proposal accepted (Adam Myers) u~23 on a few k sq.degs looks possible
DES: current design ~500 sqdeg overlap, could be increase to 1500 sq.deg on
South Galactic cap. We can apply for DECam imaging on NGC - yearly repeat
observation strategy
CFHT u-band: 10 sqdeg/hour with u<~24 - plan for a LP, next call end of 2011
=> ~400h, 4000 sqdeg on NGC?
Jean-Paul Kneib - eBOSS - LBL - June, 24th 2011
vendredi 24 juin 2011
10
e-BOSS next steps
• Informal discussion of After-Sloan-3 projects (including eBOSS) during the BOSS
meeting March 24-26 2011. eBOSS was very well received.
• This meeting
• After-Sloan-3 Proposal LOI deadline -- July 1, 2011
• Do we need an other meeting mid/late August (focussed on
proposal writing) ?
• After-Sloan-3 Proposal deadline -- September 1, 2011
• Review proposals, assemble AS3 program -- Sept through November 2011
• ARC Board review -- November 2011
• ARC Board review, submit funding proposals -- 2012 through 2013
• Partners signed on, agency funding decisions -- 2013 through 2014
• Start AS3 -- mid-2014
Jean-Paul Kneib - eBOSS - LBL - June, 24th 2011
vendredi 24 juin 2011
11
e-BOSS meeting agenda
• Felipe Abdala/Masao Sako: DES interest
• David Schlegel: BOSS heritage
• Johan Comparat: ELG selection
• Christophe Yeche: QSO selection
• Adrian Lee: CMB lensing measurement
• Sudeep Das: cross-correlations of POLARBEAR with BOSS
• Nic Ross: BOSS+
• @noon: lunch talk
Jean-Paul Kneib - eBOSS - LBL - June, 24th 2011
vendredi 24 juin 2011
12
e-BOSS proposal writing
20 pages - need writing team - new/better name for proposal?
• abstract + list of proposers (1 page)
• introduction/motivation (1page)
• science goals/survey optimization
• Other science, synergy with other surveys
• description of the survey (survey area/imaging data) - addressing feasibility and
risk
• target selection ELG
• target selection QSO 1<z<2
• target selection Lyman-alpha QSO
• other/ancillary targets (eROSITA, Clusters, other?)
• Survey management
• implementation: dark nights, number of plates, requirements
• operation, data processing/analysis distribution
• key people and role
• letter of interests
• Funding model
Jean-Paul Kneib - eBOSS - LBL - June, 24th 2011
vendredi 24 juin 2011
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