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

VO Status @ NCU, TW Information From 2MASS Star Count. 章展誥 a ，高仲明 a,b ，彭定弘 a a. Ins t. of Astronomy, Nat ’ l Central Univ . , Taiwan b. Dep t. of Physics and Center for Complex System, Nat ’ l Central Univ . , Taiwan. Outline. VO@NCU,TW Status & Strategy 2MASS Star Count (SC) Model Data

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

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  1. VO Status @ NCU, TWInformation From 2MASS Star Count 章展誥a，高仲明a,b，彭定弘a a. Inst. of Astronomy, Nat’l Central Univ., Taiwanb. Dept. of Physics and Center for Complex System, Nat’l Central Univ., Taiwan China-VO 2006, Guilin

  2. Outline • VO@NCU,TW Status & Strategy • 2MASS Star Count (SC) • Model • Data • SIMPLE 2MASS SC Tool • Future Work • SC Model • TAOS Light Curve DB Publish

  3. Status & Strategy • Be a user rather than a developer • Infrastructureex: JVO skynode toolkit……etc. • Available and suitable VO resourcesex: VOPlot, 2MASS DB…etc. • IT SupportsNCHC@TW , ASCC , and CSIE Dept • Science Oriented

  4. So… There we go 2MASS Star Count

  5. What is Star Count • Why the starry sky looks like that • Galactic structure parametersn0, Hr, Hz, Zsun, LF and extinction

  6. 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

  7. 0.6 0.4(γ-1) Cutoff Our Works(1) — Simple Model • A Double exponential decay disk, spheroid not included • A Power Law Luminosity Function, L-γ, B0 to M9 • No extinction 0.6 0.4(γ-1) Cutoff

  8.   Our Works (2) — Data • 2MASS Point Source Catalog (SNR > 5, detected in all JHKs band) • HTM~1 square degree, 32768 nodes(JHU HTM package) • Data FittingFind out the structure parameters

  9. Simple VO Star Count Tool • Software • JVO skynode 0.4.3 • Tomcat 5.x • JDK 1.4 above • VOPlot • 2MASS SC toolhttp://140.115.34.187:8080/2MASSSC • Star Count Cataloghttp://140.115.34.187:8080/skynode

  10. Future Work • VO SC tool with model • TAOS time serious data base………………if data is suitable for publish

  11. Brief Introduction of TAOS • Taiwan-American Occultation Survey • KBO searching • Telescopes • How it works ? What we see ? • Byproduct– light curve database.

  12. TAOS Telescopes

  13. How does TAOS work ?

  14. What Would We See ? t=0 t=+1s t=+2s t=+3s

  15. TAOS Byproduct - Light Curve Hundreds to thousands stars are monitored per night. We have huge and unique light curve database

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