Odin’s Hunt for Molecules cooperation between Canada, Finland, France and Sweden.
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Transcript of Odin’s Hunt for Molecules cooperation between Canada, Finland, France and Sweden.
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Odin’s Hunt for Moleculescooperation between Canada, Finland, France and Sweden
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Some Odin Quick - Facts :* 1.1 m telescope (beam size: 2’ / 9’ at mm / submm)
* 4 x cryo-cooled, tuneable submm mixers (486-504 & 541-581 GHz)* Cryo-cooled HEMT receiver at 119 GHz for sensitive O2 searches* Broad-band AOS (BW = 1040 MHz)
* 2 x Hybrid autocorrelators (BW= 100-800 MHz)
”Simultaneous observations using any combination of three receivers”
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Odin projects not to be discussed by me:
• Hunting for O2 - Pagani
• Hunt of Comets - Biver
• The Atmosphere of Mars - Lellouch
• and also … by Signore & by Maoli …
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Spectral scan searches for Primordial Molecules -
”Hunting structure formation during the dark ages”
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Ammonia and water in IRC+10216• Hasegawa et al. 2005,
submitted to ApJ
• Confirms SWAS -H2O (60 hours vs 600hours)
• Ammonia and water abundances are very high in this C-rich source :
1x10-6 and 2x10-6
Suggested SWAS scenario is ”Evaporation of Comets”,
but cannot explain ammonia level (in case of solar-type comets)
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Water in W Hya
• Justtanont et al. 2005
(A&A 439, 627)
• Water abundance is very high: (2-3)x10-3
• ”Another extra-solar cometary system may
have been detected”
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Ammonia in Sgr B2 & Orion KL
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Water in Sgr B2
• 18O/17O ratio = 2.9, after correction for optical depth
• H2O absorption is
very optically thick;
H2O emission, too…
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Water & HCO+(J=1-0) towards W49N
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Infall / Outflow / Absorption towards the G34.3-0.2 hot core
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Orion KL spectral scan
In total:
487- 492 and
541-576 GHz
Shown here:
547- 562 GHz
Observing time:
50 hours / GHz
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Orion KL spectral scan 550.5-553.5 GHz
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Water emission regions in Orion KL• HDO (20 2 - 111)
Eu = 66 K
• para-H2O ( 62 4 - 71 7)
Eu = 868 K - Hot Core
• ortho-H2O (110 - 101)
Eu = 27 K (61 K)
- H218O
- H217O
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Water and CO(5-4) at 40” resolution”Deconvolution of mapping cubes”
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Shocked H2 in Orion KL
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Water & CO in the Orion Bar
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Orion KL 13CO(5-4) at 40” resolution ”Deconvolution of mapping cubes”
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Ammonia et al. in Orion KL
- H2S (331-322), Eu=166 K
Blend with SO2
- NH3 (10-00), Eu= 29 K
- 15NH3 (10-00), Eu= 29 K
- CH3CN (J=30-29, K=4)
Eu=500 K
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Herschel vs Odin
* Small source Odin signals will be
> 10 times stronger * Herschel’s SIS noise level will be
> 10 times lower that of Odin’s Scottky mixers
* Counted in required integration time this means
> 10000 : 1 & Great hope !!!
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Some Odin References :• Odin Special Issue of A&A Letters (A&A 402, L21-L81)
• Hjalmarson et al. 2005, Advances in Space Research
• Wilson et al. 2005, A&A 433, L5 (O2 search in SMC)
• Justtanont et al. 2005, A&A 439, 627 (W Hya)
• Hasegawa et al. 2005, ApJ, submitted (IRC+10216)
• Talks at the recent Asilomar IAU Symposium*
by René Liseau and by Hans Olofsson 2005
• Posters at the recent Asilomar IAU Symposium*
by Persson et al., Encrenaz et al, Wirström et al & Ristorcelli et al. 2005
* http://asilomar.caltech.edu/