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Content Provider | AstroPix |
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Description | The image is a false-colour infrared photo of the nearby barred spiral galaxy Messier 83. It shows the central area in detail. Technical information:This image of Messier 83 is based on a composite of three images in the filters Ks (NTT + SOFI ; wavelength 2.162 m; Full-Width-Half-Maximum (FWHM) 0.275 m; total exposure time on target 49 min; approx. 12 min per quadrant; here rendered as red); J (NTT + SOFI; 1.247 m; 0.290 m; 22 min; 5 min; green), and I (Danish 1.54-m + DFOSC ; 0.797 m; 0.142 m; 20 min; full-field coverage; blue). As indicated, the Ks and J images were created from exposures of four neighbouring fields. These images were taken in May 2001 during a period with 1.0 arcsec average seeing. The original frames have 1024 x 1024 pixels, each measuring 0.29 arcsec. The resulting mosaic was created from 31 Ks-band object frames and 17 J-band object frames, each with 100 sec exposure time. From each object frame, a sky frame with the same exposure time was subtracted to remove the sky contribution. The final size of the mosaic image is 1905 x 1839 pixels (9.2 x 8.9 arcmin). The I image was observed in February 1998 by Sren Larsen (more information about this image is available in "Astronomy and Astrophysics Supplement", Vol 139, p.393-415, 1999 and at URL: http://nedwww.ipac.caltech.edu/). The original frame size was 2036 x 2042 pixels, each measuring 0.39 arcsec. The pixel size and the field-of-view of this image was changed to match the characteristics of the Ks and J images. North is up and east to the left. |
File Format | TIF / TIFF |
Language | English |
Publisher | European Southern Observatory |
Publisher Date | 2009-01-07 |
Access Restriction | Open |
Rights License | Creative Commons Attribution 4.0 International License |
Subject Keyword | Galaxy Barred Messier 83 |
Content Type | Image |
Educational Role | Student Teacher |
Educational Use | Self Learning Classroom |
Education Level | Any Level/Generic |
Resource Type | Photograph |
Subject | Physics Solar System |
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