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<HEAD>
<TITLE>M51 From Chicago</TITLE>
</HEAD>

<h2>Messier 51--The Whirlpool Galaxy!</h2>
<HR>

<P>This image is a 56 minute exposure, all combined together.  It has been
dark-subtracted, flat-fielded, translated to account for clock drive
errors, and processed in Iris with a final modified equalization to bring
both bright and faint details together.  Take a look just below the
companion galaxy.  See those three faint tendrils?  They are plumes of
stars and dust thrown out of the galaxy during its interaction with M51.
There is also a more distant galaxy visible to the far lower left as a
fuzzy
dot.
<P>
<A
HREf="http://astro.uchicago.edu/RAS/rchive/images/ccd/2000-03-29/m51final.jpg"><IMG
SRC="http://astro.uchicago.edu/RAS/rchive/images/ccd/2000-03-29/m51s.jpg">M51,
56minutes.</A>

<hr>

<P>These images are a combination of 14 images of thirty seconds each.  
It was moderately hazy in Chicago that night, so there is room for
improvement of the signal to noise ratio!  I've processed the images in
different ways, to highlight various parts of the galaxy pair.

<P><A
HREF="http://astro.uchicago.edu/RAS/rchive/images/ccd/2000-03-13/m51-7min-stretch.jpg"><img
src="http://astro.uchicago.edu/RAS/rchive/images/ccd/2000-03-13/m51-7min-stretchs.jpg">This
is a high-contrast version, so fainter detail stands out.</a> <P> <P><A


HREF="http://astro.uchicago.edu/RAS/rchive/images/ccd/2000-03-13/m51-7min-detail.jpg"><img
src="http://astro.uchicago.edu/RAS/rchive/images/ccd/2000-03-13/m51-7min-details.jpg">This
is an attempt to show both the bright nuclear region and the outlying
spiral arms.</a>

<HR>
<I>Dean W. Armstrong, 29 March 2000</I>
<P><B>Return to:</B> <A HREF="http://astro.uchicago.edu/RAS">RAS home page</A>&nbsp;