Naoki KitaMay 9, 2018 @Ando Lab

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…

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.

We apply Fourier Transform to Light Curve and get Power Spectrum.

Light Curve

FT

Power Spectrum

0.0065 Hz

0.013 Hz

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

PN

TimeResolution

[s]

TimeResolution

[s]

【Lorentzian】

𝐿 𝑥 =𝐿𝑁

1 +2 𝑥 − 𝑥0

∆𝑥

2

【Power-law】

𝐴 𝐸 = 𝐾𝐸−𝛼

Exponential model

【Constant】C=C

𝑓 [Hz] = 1903.28𝑀

𝑀⨀

−1

inverse proportionality

If we can adopt the relation toother type BH candidates,Their QPO frequency should bemuch smaller…?

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