Naoki Kita - 東京大学 · 2018. 7. 20. · Naoki Kita May 9, 2018 @Ando Lab. Why X-ray? ⇒There...
Transcript of Naoki Kita - 東京大学 · 2018. 7. 20. · Naoki Kita May 9, 2018 @Ando Lab. Why X-ray? ⇒There...
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Naoki KitaMay 9, 2018 @Ando Lab
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Why X-ray?⇒There are many kinds of electromagnetic waves.
Especially X-ray and γ-ray are suitable for high-energy objects.How to research?⇒Analysis the data from the X-ray observatories.What main target?⇒Galaxy, Cluster of Garaxies, Black Hole, AGN, NS and so on…
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5 − 15 𝑀⨀ 102 𝑀⨀~ 10
6 −109 𝑀⨀
This type is generatedfrom supernova of
fixed stars.
This type is generatedfrom the union of two
Stellar-mass BHs. The candidates is
called “ULX”, Ultra-Luminous X-ray
source.
This type is generatedfrom mass accretion
around intermediate-mass BHs. But this is
one of hypotheses andthe existence is almost
unknown.
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We apply Fourier Transform to Light Curve and get Power Spectrum.
Light Curve
FT
Power Spectrum
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0.0065 Hz
0.013 Hz
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X-ray radiation from dilute high-temperature gas model
Spe
ctr
al int
ensi
ty[c
oun
t/s/
keV
]
Energy[KeV]0.5 1 2 5 100
.01
0
.1
1
OFe-K
SiFe-L Ca
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PN
TimeResolution
[s]
TimeResolution
[s]
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【Lorentzian】
𝐿 𝑥 =𝐿𝑁
1 +2 𝑥 − 𝑥0
∆𝑥
2
【Power-law】
𝐴 𝐸 = 𝐾𝐸−𝛼
Exponential model
【Constant】C=C
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𝑓 [Hz] = 1903.28𝑀
𝑀⨀
−1
inverse proportionality
If we can adopt the relation toother type BH candidates,Their QPO frequency should bemuch smaller…?
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Analysis QPO of 6 candidates andAdopt the relation
Then…The mass of all objects are included inIntermediate-mass BH region!!
𝑓 [Hz] = 1903.28𝑀
𝑀⨀
−1