NGC 7469
NGC 7469 is a Seyfert 1 galaxy with a well known starburst rin
around it. It has been observed with the Hubble Space
Telescope in the visible amd with other adaptive optics system
in the infrared. The Seyfert 1 nucleus provides a good source
to lock the loop, and the very close environment is rich with
morphological information on the starburst phenomena.
The left pannel shows the image of NGC 7469 with a logarithmic scale,
while the right pannel shows the same image with a linear scale and
cuts to enhance the starburst ring around it. This image was obtained
through the wide band H filter (1.65 microns). It is a mosaic
of images obtained over two nights (July 23rd and 24th 1999);
each individual frames was 5 second long and the image is the
sum of approximately one hundred such frames.
The scale here is the same as above, but these images were obtained in
the K' band (2.1 microns). The individial frames were 5
seconds long and there are approximately 50 such frames
mosaiced here. Note that even though the signal to noise ratio
on the ring is slightly less than on he H band image (due to
the lesser number of frames obtained in the mosaic process), the
resolution and image quality is somewhat better (as shown by
the diffraction ring around the nucleus).
Combining these two images produces the images below. Because of very
low absorption and because most of the flux in the starburst
ring is stellar, there are no color gradients or proeminent
features in this true color composite. [NB, blue is K' and red
is H].
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