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Infrared Universe to be seen by QDs

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Presentation on theme: "Infrared Universe to be seen by QDs"— Presentation transcript:

1 Infrared Universe to be seen by QDs
? Y.DOI

2 Infrared View Of The Constellation Orion (オリオン座)
11/22/2018 IR Universe, Y.DOI

3 IRAS - The Infrared Astronomical Satellite
Launched in 1983 by ESA and NASA 60 cm telescope, cooled by LHe Survey the whole sky in IR ( mm)

4 IRAS view of the whole sky
12,25,60, and 100 micron bands – composite image 11/22/2018 IR Universe, Y.DOI

5 Infrared Cirrus (絹雲orすじ雲)
Diffuse, hazy emission covers the whole sky 11/22/2018 IR Universe, Y.DOI

6 Infrared Spectrum Desert, Boulanger, and Puget, 1990, A&A 237, 215-236
11/22/2018 IR Universe, Y.DOI

7 THE GALAXY (銀河系) Artistic Paint (based on Scientific Observations)

8 Interstellar Matter (星間物質)
Interstellar gas (星間ガス) H(90%), He(10%), others(<10^-4)… nT≒10^4 [K cm^-3] Interstellar dust (星間塵) C and SiO compounds 0.1 micron or smaller (down to “big molecules”) Dust/gas mass ratio～0.01 11/22/2018 IR Universe, Y.DOI

9 Dust Absorption Spectrum
Desert, Boulanger, and Puget, 1990, A&A 237, 11/22/2018 IR Universe, Y.DOI

10 Dust Size Distribution
Desert, Boulanger, and Puget, 1990, A&A 237, 11/22/2018 IR Universe, Y.DOI

11 Cold Dust? Cf. e∝sT4 11/22/2018 IR Universe, Y.DOI

12 Dust absorption (星間吸収)
11/22/2018 IR Universe, Y.DOI

13 Gas Heating Photoelectron emission from gaseous particles
Photoionization of hydrogen atom Ionization potential: 13.6 eV Random walk of recombination photons Finally absorbed by dust particles “HII region” T ～ 10^4 [K] 11/22/2018 IR Universe, Y.DOI

14 Emission Nebula (散光星雲)
11/22/2018 IR Universe, Y.DOI

15 Gas Heating II Photoelectron emission from dust particles
Photoelectric effect Work function ～ 6 eV ⇒ eV photons ～1 % of energy absorbed by dusts T ～ 100 [K] 11/22/2018 IR Universe, Y.DOI

16 FIR Emission Lines [CII] 158 mm [OI] 63, 145 mm [OIII] 52, 88 mm
[NII] 122, 205 mm etc… Fischer, 2000, ESA SP-456 11/22/2018 IR Universe, Y.DOI

17 Balloon telescope 11/22/2018 IR Universe, Y.DOI

18 [CII] 158mm Milky Way 11/22/2018 IR Universe, Y.DOI

19 Density measurement 11/22/2018 IR Universe, Y.DOI

20 [CII] 158 & [NII] 205 distribution
7°resolution… No 122 mm data ISO observed 122 mm but the region is quite limited. 11/22/2018 IR Universe, Y.DOI

21 Viewing the early universe

22 Red-shift (z: 赤方偏移) l *= (1+z)
Galaxy formation epoch: Z～5-10?? (nobody knows) 300 mm or longer should be observed!! 11/22/2018 IR Universe, Y.DOI

23 Newborn stars – future home of ET
SETI: Search for Extraterrestrial Intelligence “proto-planetary disk” 11/22/2018 IR Universe, Y.DOI

24 Our approach ASTRO-F Launch: Feb. 2004 Main mirror: 70 cm
Obs. band: 2～200μm 11/22/2018 IR Universe, Y.DOI

25 FIR Detector ( mm) 11/22/2018 IR Universe, Y.DOI

26 Detector Structure 11/22/2018 IR Universe, Y.DOI

27 Ge:Ga chips in cavities
11/22/2018 IR Universe, Y.DOI

28 15 sets… 11/22/2018 IR Universe, Y.DOI

29 Spectrum Response 11/22/2018 IR Universe, Y.DOI

30 dN/dz 11/22/2018 IR Universe, Y.DOI

31 And Beyond… To be launched (hopefully) around 2010
Launch by HII rocket to Lagrangian point 2. Higher spatial resolution, longer wavelength! 11/22/2018 IR Universe, Y.DOI

32 Summary FIR emission traces “Star-formation history”.
Emission from interstellar matter Energy input from newly formed stars Gas density, ionization state, abundance, etc. Important for look back ancient universe Due to redshift 11/22/2018 IR Universe, Y.DOI

33 We need QDs! Longer wavelength Large format [NII] 205 mm, CI 370 mm
Low temperature dust Redshifted [CII] 158 mm, [OI] 63 mm Large format Indispensable for obs. with higher spatial resolution 11/22/2018 IR Universe, Y.DOI

34 Helium burning “Nominal” nuclear fusion in stars
p(p,e++n)d d(p,g)3He 3He(3He,p+p)4He Helium burning: later stage 4He+4He→ 8Be, 8Be+4He→12C+g 11/22/2018 IR Universe, Y.DOI

35 Galactic plane 11/22/2018 IR Universe, Y.DOI

36 CI distribution Tielens and Hollenbach, 1985, ApJ 291, 722-746
van Dishoeck and Black, 1988, ApJ 334, 11/22/2018 IR Universe, Y.DOI

37 2.73 K CBR 11/22/2018 IR Universe, Y.DOI

38 CRE回路 11/22/2018 IR Universe, Y.DOI

39 Newborn stars – future home of ET
11/22/2018 IR Universe, Y.DOI

40 Emission Nebulae (散光星雲)
Orion M42 and Carina 11/22/2018 IR Universe, Y.DOI

41 波長感度特性(400 N mm-2) 11/22/2018 IR Universe, Y.DOI

42 HI(21cm) H2(CO) HII(2.7G) IR 11/22/2018 IR Universe, Y.DOI

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