absorption line survey toward the galactic center ii miwa goto max-planck-institut fuer astronomie...
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![Page 1: Absorption line survey toward the Galactic center II Miwa Goto Max-Planck-Institut fuer Astronomie Heidelberg, Germany contribution from Subaru to the](https://reader035.vdocument.in/reader035/viewer/2022062314/56649e9e5503460f94b9f369/html5/thumbnails/1.jpg)
Absorption line survey toward the Galactic center II
Miwa Goto Max-Planck-Institut fuer Astronomie
Heidelberg, Germany
contribution from Subaru to the exploitation of H3+ in space
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Here is my acknowledgement to
B. J. McCall (Univ. of Illinois)T. R. Geballe (Gemini Observatory)T. Oka (Univ. of Chicago)T. Usuda (Subaru Telescope)
Japan Society of Promotion of Science
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What is Subaru?
It is a Telescope.
Atop at Mauna Kea in Hawaii
8.2-m primary mirrorthe world largest class
Joined the force of exploitation of H3+ in the ISM since 2000
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Honolulu Hil
o
Honolulu
Hilo
MaunaKea
Hilo
London
Subaru Base facility in Hilo
Subaru Telescope
How to get there
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What is so special about Subaru and its spectrograph
Usually, these two are conflicting demands in observation.
unlike with CO
H3+ so nasty scattered all over the 3um region
still needs high spectral resolution
Velocity dispersion in interstellar cloud < 10 km/s
3.4 um 4.1 um
Oka Phys. Rev. Lett. 45, 531 (1980)
…it is particularly suited for absorption line survey
Which requires wide wavelength coverage
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Subaru/IRCS selling point: wide wavelength coverage
Atmospheric transmission
IRCS(Infrared Camera and Spectrograph
H3+ lines
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Subaru/IRCS selling point: wide wavelength coverage
High dispersion
Low dispersion
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Survey type observation
2-fold:
- extend the series of lines for one object
- Detect lines in as many object 8-m primary helps
Cross-dispersing spectrograph helps
Is powerful mean of observation when a new field is just open
Absorption line Survey
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Brief history
Pre Subaru: 1996; detection in ISM ( If there is H3+ in space? )1998-1999: diffuse cloud enigma widely recognized by community
Subaru I: 2002; metastable state
Subaru II: 2005; R(3, 3)l is ubiquitous in the Galactic center.
Subaru III:
(extension toward wavelength)
(Extension of sources.)
(Tom-sans talk yesterday)
(McCall et al. )
(Oka et al. 2005)
(Geballe & Oka 1996)
2006-; What comes next?
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Subaru IIIt is ubiquitous!
R(2,2)l : -
R(2,2)l
R(3,3)l
R(1,0)l+R(1,1)u
R(3,3)l : +R(1,0)l : +
At least in Galactic CenterBut only in the Galactic Center
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Dots Line Area
-180 pc
Subaru III: How far the boundary extend?
Where R(3,3)ldisappears?
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Trick to increase Absorption line survey Use late type stars. ( we know it is not clean) But See, Can use
it.
R(1,1)
R(1,0)
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Thanks!!
B. J. McCall (Univ. of Illinois)T. R. Geballe (Gemini Observatory)T. Oka (Univ. of Chicago)T. Usuda (Subaru Telescope)
Japan Society of Promotion of Science