A first look at the UKIDSS data

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A first look at the UKIDSS data
Steve Warren UKIDSS Survey Scientist with Steve
Weatherley (Deteca Ltd), Paul Hewett (Cambridge)

1. UKIDSS design
2. First data
3. Survey timetable
4. Summary

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1. UKIDSS design

• 4x2048x2048 Hawaii II arrays
• 0.4 arcsec pixels
• 0.21 sq.degs / exposure
• 2x2 microstep to sample
• 2x2 macrostep to tile
• Filters Z,Y,J,H,K,H2-S(1),Br-g
• 1 deg2 K19.5 / hr (5sig)

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1. UKIDSS design

• Near-infrared explores the cool, the
  dust-obscured,
• and the high-redshift universe

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1. UKIDSS design5 elements of UKIDSS

Large Area Survey LAS YJHK 18.4K 4000 s.d. 262n ExGal
Deep Extragalactic Survey DXS JK 21.0 35 118 ExGal
Ultra Deep Survey UDS JHK 23.0 0.77 296 ExGal
Galactic Plane Survey GPS JHK 19.0 1800 186 Gal
Galactic Clusters Survey GCS ZYJHK 18.7 1600 84 Gal
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1. UKIDSS design
Large Area Survey SDSS near-ir photom, Y dwarfs, z7 quasars
Deep Extragalactic Survey Multiwavelength fields, the Universe at 1ltzlt1.5, FMOS spec
Ultra Deep Survey Multiwavelength field SXDS, the Universe at z3
Galactic Plane Survey Galactic-plane atlas -5ltblt5
Galactic Clusters Survey Universality of the stellar IMF
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Hewett, Warren, Leggett, Hodgkin, 2006, MNRAS,
submitted, The UKIDSS ZYJHK photometric
system
M L T (Y) Jup
T(K) gt2200 2200-1300 1200-400?
(?400-150) 150
SDSS, 2MASS limit T700K
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1. UKIDSS design

• ESO public survey
• 1000 nights UKIRT over 7yrs
• UKIDSS 100 X 2MASS
• near-ir SDSS
• began 2005 May 13

survey P/P2MASS V/V2MASS
LAS 29 7.0
GPS 40 7.2
GCS 18 3.7
DXS 31 2.2
UDS 35 0.8
total 153 20.9
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1. UKIDSS design

• Project structure 4 separate elements
• 1. WFCAM
• Built by ATC for JAC
• UKIRT facility instrument
• 2. Pipeline
• Built at Cambridge (CASU, Mike Irwin)
• Operates on all WFCAM PATT progs
• Responsible for calibration
• 3. Archive
• Built at Edinburgh (WFAU, Nigel Hambly)
• Archives all WFCAM data, with special status for
  UKIDSS
• 4. UKIDSS
• Designs and obtains approval for surveys
• Science input to pipeline and archive design
• Undertakes the observing, with JAC
• Science verification
• Forum for science exploitation
• No proprietary access

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2. First data
2MASS
2MASS
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2. First data
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2. First data
Band Target depth 40s Vega 5sigma Achieved depth 40s Vega 5sigma
K 18.4 18.24/-0.29
H 18.8 18.97/-0.18
J 19.6 19.60/-0.20
Y 20.5 20.10/-0.28
Z 20.25/-0.26
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2. First data GCS (Lodieu, Deacon), GPS
UKIDSS extinction map (Hoare, Gaspar)
M17 2MASS
IC4665, 6.5deg2
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2. First data DXS (Edge)
Partial stack ELAIS-N1 Eduardo Gonzales-Solares
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2. First data DXS (Edge)
Match to SWIRE data Eduardo Gonzales-Solares
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2. First data UDS (Almaini)
K20.8
50 arcmin K23
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2. First data LAS
UKIDSS SV 10 deg2
Large KX survey, Klt16, unbiased by intrinsic or
intervening obscuration
SDSS redshift distribution
Warren, Hewett, and Foltz, 2000
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2. First data LAS
SDSS limit z6.4
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3. Survey timetable

• 2005 Dec end SV
• 2006 Jan 31 DR1 to ESO
• 2006 Jun 1 DR2 to ESO?
• 2006 Nov renewal proposal to UKIRT Board
• 2007 Jun 31 DR1 to world
• 2007 Mar 31 end 2-yr plan observations
• 2012 completion

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4. Summary

• WFCAM is the worlds best near-ir survey camera
• WFCAM pipeline and archive are producing science
  quality data
• UKIDSS design depths achieved in JHK, 0.4mag.
  short in Y
• 10 of UKIDSS has been observed
• 3 of UKIDSS (3X2MASS) will be released 2006 Jan
  31