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High Acuity Wide-field K-band Imager

High Acuity Wide-field K-band Imager. HAWK-I. λ range: 0.85 - 2.5  m field: 7.5‘ x 7.5’ with 0.1” pixel filters: VISTA: z,J,H,Ks ; narrow band: Br γ , CH 4 , H 2 , 1.061, 1.187, 2.090 m detectors: 4 Hawaii 2k at 60-80 K

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High Acuity Wide-field K-band Imager

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  1. High Acuity Wide-field K-band Imager HAWK-I • λ range: 0.85 - 2.5 m • field: 7.5‘ x 7.5’ with 0.1” pixel • filters: VISTA: z,J,H,Ks ; narrow band: • Brγ, CH4, H2, 1.061, 1.187, 2.090 m • detectors: 4 Hawaii 2k at 60-80 K • design: all reflective at 120K • sensitivity: 21.6 [mag/10σ/1h] in K • spatial resolution: <0.4’’ (FWHM) with AO

  2. The Adaptive Optics Facility •4 Lasers •Deformable thin-shell secondary mirror with 1070 actuators •WFS modules

  3. GRound layer Adaptive optics Assisted by Lasers GRAAL

  4. HAWK-I with GRAAL • Gain in: • sensitivity • resolution 1.2 0.8 0.4 seeing + GLAO

  5. HAWK-I with GRAAL: + resolution <0.4’’ (FWHM) uniform over 7.5’x7.5’ + 0.5mag sensitivity gain + exposure time reduced by ~2 Galaxy Cluster at z~1.5, FWHM~0.3” in K courtesy C.Lidman

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