VISTA Hemisphere Survey

Dark Energy Survey

VHS & DES

Francisco Javier Castander

VISTA

• Managed: UK Astronomy Technology Center (Edinburgh)

• 4-m telescope

• being built at Paranal

• 16 NIR detectors 2k x 2k

• 0.34”/pix

• f.o.v 0.6 deg2, tile into 1.6deg2

Visual Infrared Survey Telescope for Astronomy

ESO Public Surveys• 75% of ESO time on VST (optical) & VISTA (near-infrared) will be devoted to public surveys

• ESO does not have the man-power, open surveys to the community

ESO Public Surveys Policies• ESO issue Call for Public Surveys, periodicity not fixed

• At no time 2 active PS at same RA

• Public Survey Panel (PSP) review proposals

• ESO informs PI’s of PSP recommendations and invites successful PI’s to submit proposals for OPC consideration.

• OPC evaluate

ESO VST Approved PS• KIDS: The Kilo Degree Survey PI: K Kuijken (Leiden + 18 co-I’s). 1500 deg2 in 4 bands in two large areas. Weak lensing is major goal.

• VST Atlas. PI: T Shanks (Durham + 25 co-I’s) 4500 deg2 at SDSS depths. Main goal DE with LRGs (AAOmega)

• VPHAS+ VST photometric H and broad-band survey of the Southern Galactic Plane. PI J Drew (Imperial College + 27 co-I’s). ugri

ESO Announcement of Opportunity for VISTA PS

• January 15: Call for proposals

• March 15: Deadline for submission

• End April: PSP meets

• June: PSP meets with PI’s

• September 29: final proposals deadline

• End October PSP recommendations

• End November OPC recommendations

VDES collaboration• UK and Spain DES participants explore collaborations with already organized groups

• Spain joins ESO

• Decide to put a proposal ourselves

• 37 collaborators, 5 countries, 15 institutions

VDES – 5K sq degin J, Ks

VISTA Dark Energy Survey• VISTA Public Survey proposal sent to ESO to image the DES area in the near infrared

• Science goals:

Study Dark Energy

Legacy value

• Depth J~21 & Ks~19

• Exposure: J~300s Ks~320s

• 240 nights in 5 years

VISTA Dark Energy SurveyArea

VISTA Dark Energy SurveyPhoto-z

VISTA Dark Energy SurveyPhoto-z

VISTA Dark Energy SurveyClusters of Galaxies

• Emphasize the improvement in photo-z at high redshift and coverage of the SPT area

VISTA Dark Energy SurveyBaryon Acoustic Oscillations

VISTA Dark Energy SurveyIntegrated Sachs-Wolfe

• Emphasize again photo-z and the possibility to do ISW tomography

VISTA Dark Energy SurveyLensing

• Improvement in w errors in 50% and w to 5% (prior dependent)

VISTA Dark Energy SurveyLegacy

• 5 magnitudes deeper than 2MASS• galaxy studies: stellar mass• provide sources for VLT instruments (KMOS)• QSOs• Cool objects: low mass stars and solar system objects

VISTA Public Surveys sent

• 15 proposals sent (8 with UK PI)

VISTA Public Surveys Panel Outcome

• “Interesting proposal”• “it does not optimally match other relevant proposals (SDSS, VST Atlas, KIDS)”• “most of the scientific objectives could be achieved within a revised proposal by McMahon. The PI is encouraged to contact McMahon”

VISTA Public Surveys Panel Outcome

• “The proposal aims to image the entire Southern celestial hemisphere in four bands” (Z,Y,J,K)• “The panel strongly recommends that the PI submits a new proposal which focused on the science that can be achieved by covering the whole southern sky in J+K only”• “The Panel asks the PI to contact Castander …”

VHS: VISTA HEMISPHERE SurveyVHS: VISTA HEMISPHERE Survey

• PI: Richard McMahon (Cambridge)

• Deputy/co-PI: Andy Lawrence (Edinburgh)

• 95 coI’s

VHS: VISTA HEMISPHERE SurveyVHS: VISTA HEMISPHERE Survey

• Southern Hemisphere (20000 deg2) in four bands

• Depth : Z~21.9 (22.4 AB), Y~21.2 (21.8 AB), J~20.2 (21.6 AB) & Ks~18.1 (20.0 AB)

• Exposure: Z~180s, Y~180s, J~60s, K~60s

• 7500 hours => 750 nights

• 7 years

VHS: VISTA HEMISPHERE SurveyVHS: VISTA HEMISPHERE Survey

• legacy ~4 magnitudes deeper than 2MASS

• low mass stars

• LSS out z~1 & DE

• High z QSO’s -> baryonic content during the era of reionization

• merger history and Genesis of our galaxy

• support to ESA cornerstone missions: XMM-Newton, Planck, Herschel & GAIA

VHS-VDES proposal mergingAdapt to ESO’s recommendations

• Explore collaborative proposals

• VHS drops Z & Y over the whole area

• VHS increases time in DES area (VDES reduces time and incorporates H)

• DES provides Y in DES area

• VHS: 800nights 7yr ; VDES: 240nights 5yr;

newVHS: 350nights 5yr

VHS-VDES proposal mergingVHS defines three areas

• VHS-Atlas: 6000 deg2 YJHK 60s : 1120h

• VHS-DES: 4500 deg2 JHK 120s (2nd epoch): 1225h

• VHS-GPS: 8500 deg2 JK 60s : 760h

VISTA Public Surveys Panel & Observing Programme Committee Outcome

• “We are pleased to inform you that based on the feedback of the VISTA Public Survey panel, the Observing Programmes Committee has made to ESO the recommendation to implement your Public Survey proposal: The VISTA Hemisphere Survey (VHS)”

VISTA Public Surveys Panel & Observing Programme Committee Outcome

• Surveys approved: Ultra deep; VIDEO; VIKING; VHS; Magellanic Clouds; Galactic Plane

VISTA Hemisphere SurveyThe Future• Submit a Survey Management Plan Survey observing strategy

Survey data calibration needs

Data reduction process

Manpower & hardware

Data quality assessment process

Data products and VO compliance

Timeline for delivery to ESO archive

VISTA Hemisphere SurveyThe Future

• Schedule:

SMP submission: 2/16/2007

Review by ESO Survey Team feedback: 3/7/2007

SMP resubmission: 4/2/2007

End of SMP review and approval by ESO Director General: end May 2007