NAOS-CONICA performance in a crowded field - the Arches cluster

Details NAOS-CONICA performance in a crowded field - the Arches cluster NAOS-CONICA performance in a crowded field - the Arches cluster

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003msngr.111....9s&link_type=abstract

The Messenger (ISSN 0722-6691), No. 111, p. 9 - 13 (March 2003)

Physics

Optics

5

Infrared Imaging Cameras, Spectrographs, Star Clusters

Scientific paper

NAOS-CONICA is a near-infrared imaging camera and spectrograph (CONICA) attached to an adaptive optics (AO) system (NAOS) for wavefront corrections (Lenzen et al. 1998, Rousset et al. 2000). The AO system is designed to deliver diffraction-limited observations at an 8-metre-class telescope. NAOS is equipped with two Shack-Hartmann wavefront sensors operating at visual and NIR wavelengths, respectively. Most existing AO systems feed near-infrared (NIR) cameras, but operate at visual wavelengths. In addition to the fact that the spectral energy distribution of bright stars peaks at optical wavelengths, visual detectors offer higher sensitivity and lower read-out noise than NIR detectors, thus allowing one to use fainter targets for wavefront sensing. The restriction to visual reference sources, however, excludes deeply embedded objects located in regions with active star formation or high foreground extinction such as the Galactic Centre. With wavefront sensors operating both at visual and NIR wavelengths, NAOS combines the advantages of visual, faint reference targets with the option to penetrate highly obscured regions containing bright infrared sources. NAOS-CONICA was commissioned on Yepun (UT4) in the course of Period 69. For more detailed information on NACO performance and first light, see Brandner et al. (2002) in The Messenger 107.

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