VO Status @ NCU, TW Information From 2MASS Star Count

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VO Status _at_ NCU, TW Information From 2MASS
Star Count

• ???a,???a,b,???a
• a. Inst. of Astronomy, Natl Central Univ.,
  Taiwan b. Dept. of Physics and Center for
  Complex System, Natl Central Univ., Taiwan

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Outline

• VO_at_NCU,TW Status Strategy
• 2MASS Star Count (SC)
• Model
• Data
• SIMPLE 2MASS SC Tool
• Future Work
• SC Model
• TAOS Light Curve DB Publish

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Status Strategy

• Be a user rather than a developer
• Infrastructureex JVO skynode toolkitetc.
• Available and suitable VO resourcesex VOPlot,
  2MASS DBetc.
• IT SupportsNCHC_at_TW , ASCC , and
  CSIE Dept
• Science Oriented

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• So
• There we go
• 2MASS Star Count

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What is Star Count

• Why the starry sky looks like that
• Galactic structure parametersn0, Hr, Hz, Zsun,
  LF and extinction

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Motivation

• IR SkyWhat kind of Galaxy Model can describe
  star count of the IR sky?
• Famous Model
• Bahcall, 1984 Pop. I double exp disk, Pop. II de
  Vaucoleur halo
• Gilmore,1984Bahcall Pop. intermediate double
  exp THICK disk

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Our Works(1) Simple Model

• A Double exponential decay disk, spheroid not
  included
• A Power Law Luminosity Function, L-?, B0 to M9
• No extinction

0.4(?-1)
Cutoff
0.6
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Our Works (2) Data

• 2MASS Point Source Catalog (SNR gt 5, detected
  in all JHKs band)
• HTM1 square degree, 32768 nodes(JHU HTM
  package)
• Data FittingFind out the structure parameters

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Simple VO Star Count Tool

• Software
• JVO skynode 0.4.3
• Tomcat 5.x
• JDK 1.4 above
• VOPlot
• 2MASS SC toolhttp//140.115.34.1878080/2MASSSC
• Star Count Cataloghttp//140.115.34.1878080/skyn
  ode

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Future Work

• VO SC tool with model
• TAOS time serious data baseif data is
  suitable for publish

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Brief Introduction of TAOS

• Taiwan-American Occultation Survey
• KBO searching
• Telescopes
• How it works ? What we see ?
• Byproduct light curve database.

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TAOS Telescopes
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How does TAOS work ?
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What Would We See ?
t0
t1s
t2s
t3s
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TAOS Byproduct - Light Curve
Hundreds to thousands stars are monitored per
night. We have huge and unique light curve
database