Brief summaryof

the Tomo-e Gozen on Kiso Schmidt telescope

†based on SDSS-g, ±0.5 mag inaccuracy

2018/3/16

Tomo-e Gozen,Heike monogatari

Field of view ofthe Tomo-e Gozen

• Field of view 20 deg2 in φ9 deg

• Image sensors 84 chips of CMOS

• Data acquisition rate full-area: 2 fps,

=time-resolution partial-area: < 160 fps

• Data production rate 30 TB/night (max)

the first astronomical wide-field CMOS camera

the Tomo-e Gozen

84 chips of high-sensitive CMOS sensors

Sako et al. 2016, SPIE• No filters

• Absolute time accuracy ~ 1msec w/GPS

• Room temperature, No vacuumedfront-side type, w micro-lenses

Q1

Q4

Q3

Q2

• Field of view: φ 9 degrees• Primary: 150 cm spherical mirror• Corrector : 105 cm aperture• Focal ratio : 3.1• Location: Kiso, Nagano, Japan- Latitude: 35d 47m 38.7s N- Longitude: 137d 37m 42.2s E- Altitude: 1130 m

Kiso observatory, the Univ. of TokyoKiso Schmidt telescope

300 500 700 900 1100wavelength(nm)

A・η

1

0

- Chips 21 sensors- Format 2160 x 1200 pix2/chip (total), 2000 x 1128 pix2/chip (photosensitive)- File size (full-area) 4.9 Mbyte/frame/chip, 10.3 GByte (100 frames, 21 chips)- Pix size and scale 19 um/pix, 1.189 arcsec/pix- Frame rate 0.5 sec/frame, 1.5 TB/night (ave.)- Time-stamp accuracy absolute: ~1msec, stability: ~10-6

- Available exposure time 0.5 – 60 sec (full-area readout), <0.5 sec (partial-area readout)- Available continuous read 400 frames (T.B.D.)- Sensor gain Low (2.6 e-/ADU, read noise= 9.9 e- , full-well = 59,000 e-)

Mid (0.95 e- /ADU, read noise= 4.3 e- , full-well = 26,000 e-)High (0.26 e- /ADU, read noise= 1.9 e- , full-well = 6,400 e-)

- Sensitive wavelength λ = 400 – 650 nm- Filter None (nominal, transparent windows)

SDSS-g, r, i, Hα (optional, for 1 chip)Grism of R~20 (optional, for 1 chip)

• Q1 camera

- Telescope 105cm Schmidt telescope(F/3.1, f=3,300mm), Kiso observatory- Instrument rotator Not supported (position angle is fixed)- Elevation limit 8 deg- Typical seeing size 3-4 arcsec

• Telescope

Specifications of Telescope and Q1 Camera

Overview of Tomo-e Gozen Q1

FoV of Q1 camera

DET1-4

DET2-4

DET3-4

DET4-4

DET1-3

DET2-3

DET3-3

DET4-3

DET1-2

DET2-2

DET3-2

DET4-2

DET1-1

DET2-1

DET3-1

DET4-1

DET1-5

DET2-5

DET3-5

DET1-6

DET2-6

Center of Telescope FoV

25.0’

25.6’

39.7’ x 22.4’

RA-RA+

DEC+

DEC-

15.5’

159.5’

255.5’

15.5’209.6’

vignetting freeε = 1.0

ε = 0.75

Field of ViewSee Tomo-e Gozen Field Checkerhttp://www.ioa.s.u-tokyo.ac.jp/tomoe/aladin/

Detection limit and Saturation

300 500 700 900 1100Wavelength (nm)

Rela

tive

QELi

miti

ng m

agni

tude

No filter

Integration time (sec)

Integration time (sec)

LimitingMag (5σ)

SaturationMag

0.1 17.2 10.0

1 18.8 12.6

10 20.0 15.0

100 21.3 saturated by sky

Detection limit (5σ)

High-GMid-GLow-G

Saturation

Integration time (sec)

LimitingMag (5σ)

SaturationMag

0.1 16.8 8.4

1 18.7 11.0

10 20.0 13.4

100 21.3 16.0

High-G

Mid-G

Integration time (sec)

LimitingMag (5σ)

SaturationMag

0.1 16.0 7.4

1 18.3 10.0

10 20.0 12.4

100 21.3 15.0

Low-GLinearity 1% range

Gain Relative to Full-well

High 90 %

Mid 90 %

Low 80 %

Sensitivity of sensor

7