MOS observation of spiral galaxy NGC 4303
The very efficient multi-object-slit observing technique with the multi-mode instrument FORS1 is demonstrated on the Virgo cluster galaxy NGC 4303. Nineteen moveable slits at the instrument focal plane are positioned so that the faint light from several H II regions in this galaxy can pass into the spectrograph, while the much stronger "background" light (from the nearby areas in the galaxy and, to a large extent, from the Earth''s upper atmosphere) is blocked by the mask.
Credit:
ESO
About the Image
| Id: | eso0223b |
| Type: | Observation |
| Release date: | 23 August 2002 |
| Related releases: | eso0223 |
| Size: | 2076 x 2073 px |
About the Object
| Name: | Messier 61, NGC 4303 |
| Type: | • Local Universe : Nebula : Appearance : Emission : H II Region • Local Universe : Galaxy : Type : Spiral • X - Galaxies |
| Distance: | 40 million light years |
Colours & filters
| Band | Telescope |
| Optical | Very Large Telescope FORS1 |
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