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

This presentation explores the 2MASS Star Count model to determine Galactic structure parameters in the IR sky. It covers famous models, our works, data analysis, and the Simple VO Star Count Tool. Future work includes developing a VO SC tool with a model and TAOS time-series data for publishing.

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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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