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Spectrum-Roentgen-Gammaastrophysical
project, current status
Mikhail Pavlinsky (IKI, Moscow) on behalf of SRG
team
X-RAY Astronomy 2009, Bologna, 11 September, 2009
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News August 18, 2009, Roscosmos (Russia) and
DLR (Germany) signed an Agreement On cooperation
in the framework of Spectrum-Roentgen-Gamma
orbital astrophysical project
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• Roscosmos, Russia
• Space Research Institute, IKI, Moscow, Russia
• Lavochkin Association, Khimki, Russia
• VNIIEF, Sarov, Russia
• Max-Planck-Institute for Astrophysics, MPA,
  Garching, Germany
• Istitut fur Astronomie und Astrophysik, Univ.
  Tubingen, Germany
• Astrophysikalishes Institut Potsdam, Germany
• University Erlangen-Nuernberg, Germany
• Hamburg University, Germany
• Max-Planck-Institute for Extraterrestrial
  Physics, MPE, Garching, Germany
• DLR, Germany

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• S/C to be launched in 2012 from Baikonur
• Rocket Soyuz-2/1b buster Fregat, with gravity
  manoeuvre around the Moon
• Halo-orbit around L2
• Platform Navigator (Lavochkin Association)
• S/C total mass 2200 kg
• Payload - 1110 kg, 800 W
• eROSITA (MPE, DLR, Germany), X-ray mirror
  telescopes, 0.5-10 keV
• ART-XC (IKI VNIIEF, Roscosmos, Russia), X-ray
  mirror telescopes, 6-30 keV
• Life time - 7 years

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June, 2008
2009
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Navigator
S/C dry mass 900 kg S/C propellant up to 300
kg PL mass 2000 kg PL power 1500 W (HEO) PL
power 600 W (LEO) Pointing 2? Stabilization
5? Stabilization rate 0.36?/s Reappointing
rate 0.25?/s Life time 7 years
On-board control system, radio system and TMS
equipment
Flywheel engines
Body
Solar panels drive mechanism
Tank
Solar panels
Propulsion system
Radiator
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Observing strategy

• The three months flight to L2, verification and
  calibration of payload
• 4 years an all sky survey
• 3 years on follow-up pointed observations of a
  selection of the most interesting galaxy clusters
  and AGNs.

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eROSITA _at_ ART-XC on-axis effective area and grasp
2500 cm2 _at_ 1.4 keV 510 cm2 _at_ 7 keV
1100 cm2?deg2 _at_ 1.4 keV 45 cm2?deg2 _at_ 7 keV
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The scientific goals of the SRG/eROSITA all-sky
survey

• The study of the large-scale structure of the
  Universe ? with 100 000 galaxy clusters
• The exploration of the growth and cosmological
  evolution of supermassive Black holes in the
  Universe ? with sample ?3 million AGNs

• ?3.5?1014 M? (T?4.5 keV) up to z2
• ?2.3?1014 M? (T?3.5 keV) up to z1
• ?1014 M? (T ?2 keV) up to z0.4

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and with ART-XC complementary instrument

• All-sky survey at 6 ? 11 keV energy band with
  sensitivity
  ?3 ? 10-13 erg s-1 cm-2 keV-1 ? discovery at
  local Universe several thousands new AGNs
• Study of massive nearby galaxies clusters with T
  ? 5 keV in the pointing observation mode
• Study of intrinsically heavily absorbed/Compton
  thick AGNs ( NH ?
  3 ? 1023 ??-2)
• Survey of galactic black holes and neutron stars
  with low luminosity
• Study heavily obscured galactic X-ray binary
  systems
• Study broad band spectra of Galactic objects
  (including binary systems, anomalous pulsars,
  SNRs) up to 30 keV, spectroscopy and timing of
  point sources
• Study of cyclotron lines features of X-ray
  pulsars with energy resolution 1.5 keV up to 30
  keV

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????????? ?????? ????? ???? eROSITA
Survey
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eROSITA (MPE, DLR)

• Number of mirror systems 7
• Number of nested mirror shells 54
• FOV 1?
• On-axis angular resolution 15? (1 keV)
• Energy range 0.2 12 keV
• Diameter of 1 mirror system 358 mm
• Form of shell Wolter-1
• Focal length 1600 mm
• Material of mirror shells Nickel
• Mirror coating Gold
• Total weight 760 kg
• Power consumption 405 W

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eROSITA (MPE, DLR)

• Detector principle pn-CCD, Si
• Size 28.8?28.8 mm2
• Energy resolution 130 eV _at_ 6 keV
• Pixels 384?384
• Pixel size 75?75 µm2
• Circle time 50 msec
• Working temperature ? 80? C

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ART-XC (IKI, VNIIEF, Roscosmos)

• Number of mirror systems 7
• Number of nested mirror shells 28
• FOV ?32?
• On-axis angular resolution ?1?
• Energy range 6 30 keV
• Diameter of mirror system 148 mm
• Form of shell cone-cone
• Length of shell 580 mm
• Focal length 2700 mm
• Material of mirror shells Nickel
• Mirror coating Iridium
• Total weight 350 kg
• Power consumption 300 W

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ART-XC, detector
Am241

• Number of detectors 7
• Detector principle DSSD CdTe
• CdTe manufacturer ACRORAD
• Size 25.6?25.6 mm2
• Thickness 1 mm
• Number of strips 64?64
• Strip pitch 0.4 mm
• Energy resolution ?10 _at_ 14 keV
• Time resolution 1 ms
• Working temperature ? 40? ? ? 35? C
• Entrance window 100 ?m, Be
• ASIC VA64TA
• Background 10-2 cnt s-1 cm-2 keV-1

Prototype with 32 pixels
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ART-XC
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ART-XC
Exposition time map for ½ year all-sky survey.
The rotational axis is directed on Sun constantly.
The minimal 4-year exposition is ?1900 sec deg-2.
The survey poles position are coincide with
ecliptic poles. The total size of 2 zones with
exposition larger than 8000 sec deg-2 (near the
survey poles) is ?1260 deg2.
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ART-XC
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