H 2 » H
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H 2 » H Scoville and Sanders 198 Molecule or Atom? he Central Molecular Zone CMZ H 2 H H +
description
Molecule or Atom?. H 2 » H. The Central Molecular Zone. H 2. H. H +. CMZ. Scoville and Sanders 1987. The great ocean of truth lay all undiscovered before us. Distribution of YSOs near the Galactic center. Takeshi Oka. DIB meeting, November 22, 2008. - PowerPoint PPT Presentation
Transcript of H 2 » H
Ridgway, Carbon, Hall, Jewell, ApJS, 54, 177 (1984)
οCet M5e-M9e
R And S6-6e
TX Psc C7.2
Late-type stars are hopeless for IR spectroscopy
Nagata, Hyland, Straw, Sato, Kawara, ApJ, 406, 501 (1993)
Usable stars (hot, bright YSOs) are few
H – K ≥ 1.4
Spitzer IRAC survey if the Galactic center
Ramírez, Arendt, Sellgren, Stolovy, Cotera, Smith, Yusef-Zadeh, ApJS 175, 147 (2008)
3.6 μm (L), 4.5 μm, 5.8 μm, 8.0 μm
Two micron all sky survey (2MASS) 1.25 μm (J), 1.65 μm (H), 2.16 μm (K)
Sources of stars
Skrutskie et al. ApJ, 131, 1163 (2006)
> 106
L < 7.5
- 1.2º < ℓ < 1.2 - 0.1º < b < 0.1º
→ 1420 →
J – K ~ 5K – L ~ 1.5
~ 300