H 2 » H Scoville and Sanders 1987 Molecule or Atom? The Central Molecular Zone CMZ H2H2 H H+H+

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H 2 » H Scoville and Sanders 1987 Molecule or Atom? The Central Molecular Zone CMZ H2H2 H H+H+

The great ocean of truth lay all undiscovered before us

Distribution of YSOs near the Galactic center Takeshi Oka DIB meeting, November 22, 2008

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

Eight stars from the center to 30 pc east Oka, Geballe, Goto, Usuda, McCall, ApJ, 632, 882 (2005)

H 3 + everywhere

The great ocean of truth lay all undiscovered before us

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) > 10 6 L < º < ℓ < º < b < 0.1º → 1420 → J – K ~ 5 K – L ~ 1.5 ~ 300

CO UIST medium resolution CO spectrum