H3+H3+. Search for hot and bright stars for H 3 + spectroscopy Near the Galactic center Takeshi Oka Department of Astronomy and Astrophysics and Department.

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Presentation transcript:

H3+H3+

Search for hot and bright stars for H 3 + spectroscopy Near the Galactic center Takeshi Oka Department of Astronomy and Astrophysics and Department of Chemistry The Enrico Fermi Institute, University of Chicago and T. R. Geballe Gemini Observatory OSU international symposium on molecular spectroscopy, June 25, 2009

(2,2) (3,3) (1,1) (2,2) (3,3) (1,1) 8 stars within 30 pc from GC all show the warm and diffuse gas T = K n ≤ 100 cm -3 Goto, Usuda, Nagata, Geballe, McCall, Indriolo, Suto, Henning, Morong, Oka, ApJ, 688, 306 (2008)

A lucky summer at the Gemini South Observatory

The great ocean of truth lay all undiscovered before us We must find hot and bright young stars ! Long pathlength of H 3 +

Old (late-type) stars are useless

Nagata, Hyland, Straw, Sato, Kawara, ApJ, 406, 501 (1993) Bright and hot young stars are scarce

Search for bright and hot stars in the CMZ GLIMPSE Point Source Catalogue of the Spitzer Space Telescope, L to M Ramírez et al. 2008, ApJS, 175, 147 2MASS photometry at J, H, and K bands Skrutskie et al. 2006, AJ, 131, 1163 ~ 2,000,000 stars L < 7.5 ~ 3,000 stars (J – K)/(K – L) < 2.5K - L > 1.5J - K > 5 ~ 300 stars Low res. CO first overtone, 2.2 – 2.4μm Candidate stars Selected stars High res. H 3 + and CO spectroscopy 83 stars so far 10 new stars and 5 known stars Star L J – K K – L (J – K)/(K – L) GCS GCS NHS * NHS * 1.27* 3.79* brightness youth hotness location

Typical hot young star and cool old star (both very bright!) HotCool Spectra taken by UIST spectrometer of the UKIRT CO 2 – 0 3 – 1 4 – 2 5 – 3

Medium resolution spectroscopy at UKIRT using UIST spectrometer

# Star Spectrum location 1 J _24 K=6.5 L= pc West 2 J _56 K=8.8 L= pc West 3 J _28 K=10.0 L= pc West ? 4 J _64 K=9.4 L= pc West 5 J _33 K=9.0 L= pc West 6 J _71 K=9.2 L= pc out of plane 7 J _68 K=10.1 L=5.6 Close to Quint. 8 J _72 K=7.8 L=5.5 Close to Quint. 9 J _40 K=9.2 L= pc East 10 J _143 K=10.2 L=6.5 ?? 11 J _79 K=10.4 L= pc East. 12 J _76 K=10.3 L= pc East Candidate stars

High resolution spectroscpy for radial location

The central 2 pc Circum nuclear disk Adaptive Optics needed VLT, Subaru The central 30 pc Super-massive clusters Velocity analysis GS Whole CMZ Hunting stars UKIRT Observation Subaru, GS Tons of work ahead of us → IRTF → SOAR

Radio CO, CS, HCN, CH emission H 3 + IR abs. Understanding a monster X-rayγ-ray HII region Radio recomb. Fine structure Radio continuum H 2 FIR H 2 IR emission CO IR abs

H3+H3+