Herschel followup of SCUBA2 and ASTROF AllSky Surveys

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Herschel follow-up of SCUBA-2 and ASTRO-F
All-Sky Surveys

• Stephen Serjeant
• on behalf of SASSy team and ASTRO-F guaranteed
  time PS team

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Synopsis

• The new IRAS surveys for the twenty-first century
• The ASTRO-F All-Sky Survey
• The SCUBA-2 All-Sky Survey
• Herschel follow-up of ASTRO-F and SASSy

using some material borrowed from Planck
plans for Herschel follow-up
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ASTRO-F
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ASTRO-F
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ASTRO-F

• ASTRO-F Japanese-led all-sky far-IR survey
• deeper than IRAS approximately 100?Jy 5? at
  60?m and 200?Jy 5? at 160?m at end of survey
• higher resolution 70cm diffraction-limited
• more passbands 10?m, 20?m, 4 bands from
  50-160?m
• Launch February 20th 2006
• ESA open time call for proposals for pointed
  observations deadline mid-November

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ASTRO-F

• Far IR Surveyor (FIS)
• 4 simultaneous bands, 60-200?m
• 50-200?m spectroscopy ?/?? 250-1000
• Infrared Camera (IRC) 10x10 FOV
• MIR-L 15,20,24?m
• MIR-S 7,9,11?m
• NIR 2.2,3.3,4.5?m
• Prism and grism spectroscopy modes ?/??30-80 at
  ?lt5?m, ?/?? 40-60 at longer ?

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SASSy SCUBA-2 All-Sky Survey

• Response to call for JCMT legacy surveys awarded
  1500 hours over five years from semester 2007A
• 5? 150mJy at 850?m, triple scanning redundancy
• can use fainter limit (e.g. 3? 90mJy) for known
  objects
• Three phases
• Pilot phase two 10 degree wide strips
• P2P strip NEP - Galactic Pole - Galactic Plane
• galactic plane strip
• ALMA sky -30?40
• All sky -30?70 (extended JCMT operations)
• Rapid data release to JCMT (then wider?)
  community - emulate the spirit of the IRAS mission

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SASSy SCUBA-2 All-Sky Survey
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SASSy SCUBA-2 All-Sky Survey

• Strong synergy with ASTRO-F for high-z drop-outs
  photo-z
• What is the complete range of sub-mm galaxy
  properties in the observable Universe?
• SASSy will find galaxies among the top 23 most
  luminous in the Hubble volume
• Are the most luminous proto-spheroids strongly
  lensed?
• predict 100-4000 strong lenses at S850gt100mJy
  over whole sky
• precedents eg APM082795255
• What is the shape of the bright source counts?
• As deep as final Planck HFI catalogue but much
  earlier
• Source count models 200-800 sources
• Are there new low-z undetected populations of
  cool ULIRGs?
• Galactic science e.g. unbiased census of star
  formation at lt1kpc infrared dark clouds

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SASSy SCUBA-2 All-Sky Survey

• What is the complete range of sub-mm galaxy
  properties in the observable Universe?
• SASSy will find galaxies among the top 23 most
  luminous in the Hubble volume
• What is the shape of the bright source counts?
• As deep as final Planck HFI catalogue but much
  earlier
• Source count models 200-800 sources

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SASSy SCUBA-2 All-Sky Survey

• Are the most luminous proto-spheroids strongly
  lensed?
• predict 100-4000 strong lenses at S850gt100mJy
  over whole sky
• precedents eg APM082795255

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SASSy SCUBA-2 All-Sky Survey

• Strong synergy with ASTRO-F for high-z drop-outs
  photo-z

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SASSy SCUBA-2 All-Sky Survey

• Strong synergy with ASTRO-F for high-z drop-outs
  photo-z

• Are there new low-z undetected populations of
  cool ULIRGs?
• Galactic science e.g. unbiased census of star
  formation at lt1kpc infrared dark clouds

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Herschel follow-up

• More timely for Herschel than Planck ERCSC
  astrometry much better
• Possibility of data analysis synergies with
  SCUBA-2
• PACS and SPIRE photometry 75-500?m
• probe the peak of the SEDs, get bolometric
  luminosities, dust masses, better photo-z
• exposure times of a few min per source
• SPIRE FTS/HIFI spectroscopy
• Best possibility of blind redshift
  determination of sub-mm galaxies should be with
  SASSy could try e.g. CII (though deficient in
  local ULIRGs). Other (non-HSO) redshift survey
  programmes will also be in progress.
• Aim is to use atomic line species (e.g. C, O,
  N ) and molecules (e.g. OH, H2O) to probe SFR,
  density and temperature of ISM, radiation field,
  etc, constrained by reference to photoionisation
  and PDR models
• Key diagnostics atomic fine structure lines
  (CII, OI, OIII etc) and molecular lines (OH, H2O
  etc). Also, for brightest sources, SIII (33?m)
  and OI (63?m) may be detectable with PACS
  spectrometer.
• R20 SPIRE FTS spectrum approx. 1 hour per source