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The Hard X-ray Detector (HXD) onboard Suzaku
By the HXD team
1: Introduction and PIN etc. Kazuhiro Nakazawa (ISAS/JAXA) 2: GSO and background etc. Motohide Kokubun (Univ. Tokyo)
Suzaku 2005.07-


Introduction
-the HXD calibration is in the phase to establish default parameters -Identify the match and difference with other observatories. - ground calibration is limited to energy scale cal., shape of response cal., and basic alignment cals. - In orbit calibration for EA, Gain and alignment is held with Crab observations and activation lines in (mainly) discarded events. -Background modeling is ALSO connected to response, because any hard X-ray measurements are always background dominated

See how the HXD data looks like


The HXD design
FOVs
- BGO active shield 4.5o FOV /anti-coincidence - PSnCu passive collimator 0.55o fine FOV
cross section view
Well Unit
60 4 25.5 25.5

top view
Side Anti Unit
60 57 10 40

Passive Fine Collimator BGO

Corner Anti Unit

320
60 57

380mm

340mm Diode

Energy range
-2 mm Si-PIN diode (64 sig.) 10-60 keV -5 mmt GSO scintilator (16 sig.) 40-600 keV
t

GSO

40

340mm Photomultiplier + pre-Amplifier 340mm

CROSS-SECTION

TOP VIEW

Event data format
-PINx4, GSO/BGO in one event data -Hit pattern of 36 units -61s (opt. 30.5s) time resol. 34x34x38 cm 160 kg
3


Key points of the HXD
The lowest background
Crab
RXTE Beppo-SAX/PDS Suzaku/HXD

Narrower Field of View
SAX/PDS
1.3 deg

HXD
<100keV

HEXTE

1 deg

0.55 deg

Wide energy band

keV See Fukazawa et al. proc. SPIE Orlando 2006

Small Eff. Area
155 cm2 @ 15 keV 270 cm2 @ 120 keV


1: FOV, Through-put: Fine collimator alignment In orbit with Crab scans
Defines the through put --> eff. area of the HXD 64 fine collimators 0.1 mm / 30 cm = 1 arcmin
HXD nom. pos. HXD boresight -3.5' ~ -4' XIS nom. pos.

Scatter is 1.7 arcmin (RMS) against 34arcmin FOV.

Crab scan ~5 ks x 24 ~10 ks x6 (+40 ks x2)

Included as TELDEF file


2: Gain, Rsp : Ground Calibration
Detecter Mass Model Utilizing Geant4 framework
0.25mm 15.5 mm 4.2mm 5m
266.4cm AE

GR1:0.35

GR3:0.67 GR2:0.22

HXD
266.5cm

0.83 mm 0.75 mm 0.24 mm

2.0 mm

Full 1.0 1.0 depletion region =
21.5/2 mm

RI


0.0

-20C

See Sugiho et al.
From T.Kisisita Master Thesis, the Univ. of Tokyo, 2006
10
4

experiment data simulation data

10

3

10

2

10

1

PI [ch]


Rejected events by anti-co.

2: Gain, Rsp : In orbit
(traced with <1% accuracy) Gain is allmost constant.
Gd-K from GSO For 64 PINs

Gd-K from GSO 42keV

Energy Resolution 3.5-4.5keV

2006/02-04

2005/08-09


2: Gain, Rsp : In orbit
The Crab fitting
XIS nominal Default response PIN
Current Status at June 2006 (as of 2006/06/13 Suzaku-SWG-team-internal)

Please focus only on PIN

Ignore
Results from team-internal response under verification

Ignore Ignore

with Fixed model =2.12, N(1keV)=9.42

Ignore

PIN: ~10 % residual in effective area in 10-200 keV PIN: 15-40 keV sole fit : =2.16 N=12.5 (flux diff. is much less)


Compare with Kirsch et al. 2005


Compare with Kirsch et al. 2005

Results from team-internal response under verification


Timing Calibration with Crab
61us time resolution

33.6ms

Barycentric correction


Apdx. Expected Sensitivity
3x10
- 11

erg/s/cm2 (10-100 keV)

C o n t in u u m S e n s it iv it y

3x10

-12

dE/E = 0.5 Exp. = 100 ks 3 sigma stat. 1 and 3 % of BGD

10-30 keV, 3 sigma photon
limit for 100 ks : 0.1 mCrab

10-30 keV,
% of BGD : 0.1mCrab

The better modeling of backgrond will allow fainter source, 0.1--0.2 mCrab at 10--40 keV.