Tunable filters and large telescopes

Details Tunable filters and large telescopes Tunable filters and large telescopes

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001msngr.103...10j&link_type=abstract

The Messenger, No. 103, p. 10 - 14 (March 2001)

Astronomy and Astrophysics

Astronomy

5

Telescopes, Filters

Scientific paper

Traditionally, astronomy has relied upon filters with a fixed bandpass to select the wavelengths of the light allowed to reach the detector, thus allowing the astronomer to derive some colour information about the objects under study. In the optical, these filters are most often classical broadband UBVRI, or narrow passbands centred at the wavelengths of the common emission-line features, either at rest-frame or redshifted wavelengths. Examples of the latter are becoming numerous, especially on the 8-10-mclass telescopes that make it possible to detect very faint, distant emissionline objects, even through narrow passbands. In this vein, Kurk et al. (2000) used FORS1 at the VLT with a 65-Åwide filter at 3814 Å to image a z = 2.2 radio galaxy, searching for nearby Lyalpha detections at the same redshift. They detected around 50 such objects, collectively suggestive of strong clustering around the dominant radio galaxy. Moreover, they also found extended Ly-alpha emission (~ 100 kpc in extent) centred on the galaxy, adding further evidence to the possible scenario of protocluster formation.

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