Mathematics – Logic
Scientific paper
Sep 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002msngr.109...54w&link_type=abstract
The Messenger (ISSN 0722-6691), No. 109, p. 54 - 56 (September 2002)
Mathematics
Logic
4
3D Spectroscopy
Scientific paper
One of the inherent preoccupations of astronomy is to obtain a three-dimensional view of the Universe and its components. Except for Solar System objects, we are always presented with a two-dimensional view of celestial objects. Spiral galaxies for example could be considered only as flat structures if it were not for the rotational velocity which shows them to be spinning threedimensional entities. The distance scale is another fundamental aspect of this question - placing astronomical sources in the third dimension. Once their distance is determined, physical parameters can follow such as luminosity, radius and mass. In order to determine this information one could ideally imagine a “maximal spectrograph'' which produced the spectrum of the whole sky at some desired spectral resolution and spatial sampling on the sky. The complexity of such an instrument is obviously beyond current technological means and the sheer size of the resulting data set would be prohibitively large. Nevertheless, a small, but significant, step towards this goal is to obtain the spectrum of an area of sky and this is what 3D spectroscopy achieves. With advances in technology the sampled area is becoming bigger.
Roth Marcel
Walsh Jonathan R.
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