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TheLSSTDeep-DrillingFields:WhitePapersandScienceCouncilSelectedFields

W.NielBrandtPennStateUniversity

LSST2016August15,2016

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ScopeofMini-Surveys

Inaddition toexecuting themainsurvey,theLSSTobservingprogramwillinclude aselection ofMini-Surveys.

These haveawiderangeofscience goalsandtotalexposures.Theyinclude theDeep-DrillingFields(DDF)aswellastheNorthEclipticSpur(NES),theSouthCelestial Pole(SCP),theGalacticPlane(GP),andseveralotherprograms.

Thebaseline expectation isthattheMini-Surveyswillutilizeupto~ 10%oftheLSSTtime,butthefinalpercentage isnotyetdetermined. Thefinaldecisionwillbeinformedbytheongoingcommunity-based studyofobservingstrategy.

ScienceplansfortheseMini-Surveysstill beingdeveloped, andtheselection ofMini-Surveysisstill largelyopen.Plentyofopportunitytogetinvolvedifinterested!

Discussions expected tocontinueuptoandbeyondfirstlight.

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WhitePapers

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LSSTDeep-DrillingFieldWhitePapers

MembersoftheLSSTDeep-Drilling InterestGroup(DDIG; ~75members)preparedasetofeightsciencewhitepapers.

These arenotbindinginanyway,buttheydorepresentsomegreatideasfromthecommunity.Additionalwhitepapersarestillwelcomed.

Thesewhitepapersfollowauniformformatanddothefollowing:

1. Providescience goals2. Suggestfieldsforobservation3. Describetheneeded LSSTobservations4. Demonstrate theneedforLSSTandforDeepDrilling5. Assess feasibility issues6. Highlightareasneedingadditional workandobservations

Publiclyavailablefromhttps://project.lsst.org/content/whitepapers32012

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LSSTDeep-DrillingFieldWhitePapers

SolarSystem

GalacticandLocalGroupDistantExtragalactic

Thankyougreatlytothosewhodeveloped thesewhitepapers!

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DeepDrillingofaNearbyGalaxyCluster

Intergalacticandgalactictransients,dwarfgalaxies,LSBfeatures.

Fergusonetal.whitepaper

FornaxCluster

LSSTFOV

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LMCandSMC:AFewScienceGoals

High-cadence observations ofLMCandSMC(and47Tuc)tocharacterizebinary,pulsating, eruptive,andflaringvariables.

Assessmetallicity andageeffectsuponvariabilitybycomparingpopulations inLMC,SMC,galacticclusters,andGalactichalo.

LMC

SMC 47Tuc

Szkody etal.whitepaper

LSSTLSST

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BasicProposedPropertiesofanExtragalactic“Blank-Field”DDF

5300-13800visitsperbandover~10yearperiod.265sequences of20-52exposures perband.Cost isabout335hoursforeachsuchfield.

Approx.finalco-addeddepths:u =28.5,g =28.7,r =28.9,i =28.4,z =28.0,y =27.0.Detections for~3x106 galaxiesand~40,000AGNs.

Cadence shouldenableoptimal supernova,AGN,transientstudies.

Measuretheproperties andclustering ofsamples ofhigh-redshift galaxies andAGNstoofainttobedetected inthemainsurvey.

Utilizethedensetime samplingtoidentifyandstudysupernovae,AGNs,transients,andstronglenses.

Testandimprovephotometric redshifts neededformainsurvey.

Assess shearsystematics andtheeffectsoflensingmagnification uponLSS.

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DDFsSelectedbytheScienceCouncil

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PromptSelectionofFour“Blank-Field”DDFs

TheLSSTScienceCouncil, inconsultation withtheDDIG,chosefour“blank-field” DDFsforobservationbyLSST.Thiswasdone in2011-2012.

Thiswasseparatefromthewhite-paper activities; i.e.,thewhitepaperswerenot“proposals”totheScienceCouncil thatwerejudgedcompetitively.

TheScienceCouncil’smotivationwascommunityservice. Enablespreparatoryobservations; e.g.,thosebyobservatorieswithlimited lifetimes.

Spitzerobservationsnowongoingforthreeofthefields.XMM-Newton observationsnowongoingforpartofXMM-LSSfield,andmoreX-raycoverageproposed forthese fields.

Asidefromthefieldpositions, nothingelse decidedaboutthesefields.

TheLSSTandbroadercommunities willbeengaged,onalongertimescale, inworkingoutthebestchoices ofLSSTcadence,filters, filterbalance, dithering,etc.forthese fourfields.

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TheFourSelectedDDFs:MultiwavelengthCoverage

ELAIS-S1XMM-LSS

NewSpitzer

NewXMM-Newtonongoing

ExtendedCDF-S

COSMOS

NewSpitzer

NewSpitzer

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TheFourSelectedDDFsontheSky

UltimatelywillwanttobroadenRAdistributionofextragalacticDDFsforefficientobserving.

Someadditionalfields suggested.

SomepossibleDDFs(alreadyselectedinred)

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ThursdaySessionSchedule

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TheEnd

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