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Astronomy Picture of the Day

Posted By Editor On December 23, 2011 @ 4:24 pm In Photo Essays | Comments Disabled

Similar in size to the Milky Way, elliptical galaxy NGC 7600 is about 160 million light-years distant. In this deep image, spanning about 1/2 degree on the sky toward the constellation Aquarius, NGC 7600 sports a remarkable outer halo of nested shells and broad circumgalactic structures. The tantalizing features can be explained by the accretion of dark matter and stars on a cosmic timescale.

 

 

NGC7600 crawford Astronomy Picture of the Day [1]

Shell Galaxy NGC 7600 
Image Credit & Copyright [2]Ken Crawford (Rancho Del Sol Observatory [3])
Collaboration: Andrew Cooper (MPA [4]), Carlos Frenk, John Helly, Shaun Cole (Institute for Computational Cosmology [5]),
David Martinez-Delgado (MPIA [4]), Star Stream Pilot Survey [6] Group

Explanation: Similar in size to the Milky Way, elliptical galaxy NGC 7600 is about 160 million light-years distant. In this deep image [7], spanning about 1/2 degree on the sky toward [8] the constellation Aquarius, NGC 7600 sports a remarkable outer halo of nested shells and broad circumgalactic structures. The tantalizing features can be explained by the accretion of dark matter and stars on a cosmic timescale [9]. In fact, a movie generated by simulating galaxy formation using a cosmological model [10] with cold dark matter [11] for the halos of merging galaxies reproduces the appearance of NGC 7600 in amazing detail. The remarkable simulation movie is available here on Vimeo [12] and here in other formats [13]. It presents compelling evidence that detailed features of galaxy mergers observed with small, wide field telescopes on planet Earth, are natural consequences of galaxy formation and fundamental properties of dark matter [14].


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URL to article: http://www.berthoudrecorder.com/astronomy-picture-of-the-day-99/

URLs in this post:

[1] Image: http://www.berthoudrecorder.com/wp-content/uploads/2011/12/NGC7600_crawford.jpg

[2] Copyright: http://apod.nasa.gov/apod/lib/about_apod.html#srapply

[3] Rancho Del Sol Observatory: http://www.imagingdeepsky.com/

[4] MPA: http://www.mpa-garching.mpg.de/

[5] Institute for Computational Cosmology: http://www.icc.dur.ac.uk/

[6] Star Stream Pilot Survey: http://arxiv.org/abs/1003.4860

[7] In this deep image: http://www.imagingdeepsky.com/Galaxies/NGC7600/NGC7600.htm

[8] the sky toward: http://www.gcadventure.com/cosmic-voyage.net/n7600.html

[9] dark matter and stars on a cosmic timescale: http://www.cosmotography.com/images/galaxy_formation_and_evolution.html

[10] cosmological model: http://science.nasa.gov/astrophysics/focus-areas/what-is-dark-energy/

[11] cold dark matter: http://en.wikipedia.org/wiki/Dark_matter#Cold_dark_matter

[12] here on Vimeo: http://vimeo.com/32176781

[13] here in other formats: http://www.virgo.dur.ac.uk/shell-galaxies/

[14] properties of dark matter: http://arxiv.org/abs/1111.2864

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