Deep imaging of NGC 474 from the Canada-France-Hawaii Telescope

ngc474_cfht_1769
Image Credit & Copyright: P.-A. Duc (CEA, CFHT), Atlas 3D Collaboration

The multiple layers of emission appear strangely complex and unexpected given the relatively featureless appearance of the elliptical galaxy in less deep images. The cause of the shells is currently unknown, but possibly [they are] tidal tails related to debris left over from absorbing numerous small galaxies in the past billion years. Alternatively the shells may be like ripples in a pond, where the ongoing collision with the spiral galaxy just [to the left] of NGC 474 is causing density waves to ripple though the galactic giant. Regardless of the actual cause, the above image dramatically highlights the increasing consensus that at least some elliptical galaxies have formed in the recent past. NGC 474 spans about 250,000 light years and lies about 100 million light years distant toward the constellation of the Fish (Pisces).

For more details and links see the original APOD article from which the image and text are taken. Update: A great article from Scientific American on the trillion-year lifetimes of the lowest mass stars.

Advertisements

4 Responses to “Deep imaging of NGC 474 from the Canada-France-Hawaii Telescope”

  1. Wow! At last I got a website from where I be capable of
    truly obtain helpful information concerning my
    study and knowledge.

  2. Please let me know if you’re looking for a article author for your site.

    You have some really good posts and I think I would be a
    good asset. If you ever want to take some of the load off, I’d really like to write some articles for your blog in exchange for a link
    back to mine. Please send me an email if interested. Thanks!

  3. great site πŸ™‚ but no niblets or diblets πŸ™‚
    please email me.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: