A raw spectrum from ISAAC

A long, narrow slit isolates a small strip of sky. On this image, the slit is vertical, and slightly curved by the optics in ISAAC. The spectrograph then splits the light from the slit into its individual infrared colours, each point of the slit forming a horizontal rainbow. In the lower part, the horizontal fuzzy line is the spectrum of a faint galaxy. The glowing areas on the edge mark the position of the four amplifiers dealing each with a quarter of the detector. These electronic devices are slightly warmer than the rest, causing a minute amount of infrared light registered by the detector.

Credit:

ESO

About the Image

Id:isaac_spec_cc
Type:Photographic
Release date:13 March 2015, 03:07
Size:1024 x 1024 px

About the Object

Name:ISAAC
Type:Unspecified : Technology : Observatory : Detector
Category:Paranal

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