UIT images of M74 (original) (raw)

UIT images of M74 from the ASTRO-1 mission

The following images of the spiral galaxy M74 were obtained with the Ultraviolet Imaging Telescope (UIT) during its first flight on the ASTRO-1 Space Shuttle mission (STS-35).

[ [M74, Astro-1 early pic] ](../Pics/Jpg/m74a1.jpg) [ [PNG] ](../Pics/Png/m74a1.png)

This is an early release UIT image of spiral galaxy M74, taken in the UV light. This image was taken by UIT during Astro-1 and is shown here in false-color.

[ [M74 in UV, Astro-1] ](../Pics/More/m74uv.jpg) [ [PNG] ](../Pics/Png/m74uv.png)

Ultraviolet image from the ASTRO-1 mission. In this image, the regions of star formation along the spiral arms stand out prominently because of their high UV brightness. UIT is a 38-cm f/9 Ritchey-Chretien telescope.

This image was taken at a wavelength of 2,500 angstroms.

This image was featured as Astronomy Picture of the Day (APOD) April 9, 1996 and ofMarch 14, 1998 (together with M33 andM81)
[ ](../Pics/More/m74vis.jpg) [](../Pics/Png/m74vis.png)
Visible image, taken for comparison with the UV results from the ASTRO-1 mission. This is a direct CCD image of M74, obtained in October 1991 from the San Diego State University's Mount Laguna Observatory, with a 1-meter telescope. See Cornett et.al. (1994).
This image was taken in the visible V band. Both images above have the same scale. The central bulge, consisting primarily of old, red stars, dominates this ground-based image, while the above UIT image shows the patchy regions of star formation, containing young bright and hot stars, and tracing the spiral arms.
Photometric investigations in different UV bands can give information on the age and distribution of masses of young stars in M74 and other spiral galaxies.
[ ](../Pics/Jpg/m74uit.jpg) [](../Pics/Png/m74uit.png)
UV and visible overlay.
This image was featured as Astronomy Picture of the Day (APOD) July 9, 1996
Links:
T.P. Stecher's Ultraviolet Imaging Telescope webpage
References:
Peter C. Chen et.al., 1992. Ultraviolet Imaging Telescope observations of the ScI galaxy NGC 628 (M74). Astrophysical Journal Letters, Vol. 395, No. 1, pp. L41-L43 (08/1992) [ADS: 1992ApJ...395L..41C]
Robert H. Cornett et.al., 1994. UIT: Ultraviolet Surface Photometry of the Spiral Galaxy M74 (NGC 628). Astrophysical Journal, Vol. 426, No. 2, pp. 553-562 (May 10, 1994) [ADS: 1994ApJ...426..553C]
Pamela M. Marcum et.al., 2001. An Ultraviolet/Optical Atlas of Bright Galaxies. Astrophysical Journal Supplement, Vol. 132, No. 2, pp. 129-198 (02/2001). [ADS: 2001ApJS..132..129M]. Available online (NED Level 5)

Hartmut Frommert
Christine Kronberg
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Last Modification: June 28, 1999