SkyMapper

2 2 What is SkyMapper? 1.35m telescope with a 5.7 sq. degree field of view Fully Autonomous observing To conduct the Southern Sky Survey: Five year Multi-colour (6 filters) Multi-epoch (6 exposures, each filter) 2  steradians Limiting mag. g~23 Aiming for regular operations this year Summary of program: Keller et al PASA 24,1 Total Cost: Hardware $15M Software: $1.8M Dedicated Science/Operations: ~ $0.6M/yr

3 SkyMapper 3 Telescope Optics 1.3m primary 0.75m secondary 0.6m fused silica asphere 2 x 0.45m fused silica spherics Telescope – Focal length & f/ ratio mm f/4.78 Modified Cassegrain design

4 SkyMapper 4 The SkyMapper CCDs 32 E2V CCD44-82 devices: 2048x micron pixel CCDs Broadband coated 40 micron (thick) devices Reduced fringing, inc. red response, without bad blue 16384x ” pixels Using new Pan Starrs controllers (Onaka at IfA) Readout in ~12 seconds through 64 channels (64x350 kpix/s) Readnoise ~5-7e-

6 SkyMapper 6 SkyMapper Filter Set Filter+CCD+Atm osphere

7 SkyMapper 7 SkyMapper Filter Set is sensitive to Stellar Parameters g,Z Z

Quantified selection 11 The metallicity sensitive colour scales as expected with (spectroscopic) metallicity Weird stuff – QSOs; WDs; PNe Model expectation [Fe/H]=-5 SSPP derived Keller et al. in prep a star with no detectable Fe (it has other elements) has been found.

9 Other weird things we find A star with rapidly varying photometry and spectra with synchotron? emitting blobs symmetrically around it

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12 OIII 5007 V DSS B H-alpha R DSS R

13 SkyMapper 13 Expected Survey Limits uvgriz 1 epoch epochs Sloan Digital Sky Survey comparison 22.0n/a AB mag. for signal-to-noise = 5 from 110s exposures

14 SkyMapper 14 Conduct a Shallow Survey in photometric conditions cover the southern sky with 3 exposures: 8-15th mag (Hipparchos) Anchor the deeper Main Survey to the Five-Second photometry and astrometry Enables the Main Survey to proceed under non-photometric conditions. Self Calibration via overlaps, colour of main sequence (in low dust areas) and on photometric nights. Calibration

15 SkyMapper Primary Standards HST-based spectrophotometric standards –Normalised by Hipparchos B and V photometry via Bessell (2000) –Provides spectrophotometric standards across the sky 6 secondary standard fields chosen with Primary standards in them. These fields observed with dithers and rotations to produce a photometric flat field, with all stars calibrated to primary standards HST Program to provide network of stars across North and South Sky with spectrophotometry better than 0.5% over optical and 1% from UV through NIR. (These are being completed now) Calibration

16 SkyMapper New Standard System 6-colour photometry will be reduced as soon as possible. 6-colours should provide accurate transformations to most other systems Standard Stars in every southern field 16

17 SkyMapper Calibration Plans SkyDice - PI Nicolas Regnault - LPNHE 17 >20 LEDs covering 0.3-1μ observed through telescope with NIS calibrated photo diode absolute calibration and monitoring of optics

18 Slide Southern Sky Survey Time Poor Seeing Time

19 Slide Supernova Poor Seeing Progam (>1.7”) In Collaboration With LPNHE 1250 sq-degrees v,g,r,i to g~19. Augment with some good seeing data to achieve a 3-4 day cadence. (125,000 sq degrees per year with a 3-4 day cadence to v,g,r,i~19) Fields still be determined - balance between very far south (easy to observe), and coverage for peculiar velocity surveys (like to go North and into the Galaxy) Michael ChildressFang YuanRichard Scalzo

20 Slide Nicolas Guy from IN2P3 Regnault and Guy (IN2P3)

21 Slide Sample Light Curves Regnault and Guy (IN2P3)

SN colours within 30 days of explosion

23 SkyMapper 150 Supernovae per Year Magnitude Limited (m r =19 m ) - with complete spectroscopy Host Galaxy information on Large Fraction of Objects at site of SN Precisely Calibrated 4-colour light curves of all objects Spectroscopic series on selected objects IR photometry on selected objects 23

26 Slide Some Set Backs 13 Jan 2013

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28 Slide Some Challenges ˜

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30 Slide Some Set Backs 13 Jan > Up and Running Again 4April Vibration!

32 Slide Some Set Backs 13 Jan > Up and Running Again 4April Vibration! Richard Scalzo Crashed and Burned on his Bicycle riding home down Mt Stromlo

33 Slide Progress on Vibration We did Fourier analysis of Accelerometers placed around the entire telescope Showed that there were a number of vibrations in all parts of the telescope Modifications have been made to stiffen –Spider –Secondary Mount –Primary Mirror

34 Slide Dec ” Apr ”

35 Slide A SkyMapper Night