Double nucleus in elliptical and galaxy formation
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by Budgieye moderator
Double-nucleus elliptical MCG-01-12-005 in an X-ray emitting cluster
of galaxiesNesci, Roberto; Fiocchi, Mariateresa; Bassani, Loredana; Parisi,
PietroAbstract. The scenario of galaxy formation is believed to follow a
structure that builds up from the bottom, with large galaxies being
formed by several merging episodes of smaller ones. In this scenario a
number of galaxies can be expected to be seen in the merging phase,
with their external regions already mixed, while their nuclei, with
stronger self-gravitation, are still recognizable as such. During a
photometric monitoring of active galactic nuclei (AGNs) in the field
of a long-exposure INTEGRAL pointing, we serendipitously found an
elliptical galaxy in the center of the X-ray cluster (EXO 0422-086)
with two nuclei. We performed surface photometry on our images and
those of the SDSS archive and obtained slit spectra of both nuclei.
Aperture photometry of the two stellar-like nuclei showed very similar
colors in the SDSS image and in our Johnson BVRI images, which is
typical of an elliptical galaxy nucleus. The spectra of the nuclei
showed the typical absorption lines of an elliptical galaxy without
appreciable emission lines. The redshifts derived from each nucleus
were equal and fully consistent with the literature value (0.0397). We
can therefore exclude the possibility that one of the nuclei is a
foreground star or a background AGN and consider this elliptical
galaxy as a bona fide example of a galaxy merger.http://ned.ipac.caltech.edu/cgi-bin/ex_refcode?refcode=2015A%26A...576A.124N but the link is not working for me at the moment.
1237674284848971813
http://skyserver.sdss.org/dr9/en/tools/explore/obj.asp?ra=66.46387448242223&dec=-8.561103059567415
Re: Wanted! Galaxy pairs which overlap but are not merging
« Reply #9171 on: January 30, 2011, 04:56:47 pm » http://www.galaxyzooforum.org/index.php?topic=6732.msg526791#msg526791 by c_c;dRe: Vorontsov-Velyaminov Interacting Galaxies
« Reply #259 on: December 17, 2012, 02:16:18 am » http://www.galaxyzooforum.org/index.php?topic=279218.msg622432#msg622432 by elizabethRe: Galaxy systems
« Reply #1733 on: January 31, 2011, 07:52:58 am » http://www.galaxyzooforum.org/index.php?topic=272654.msg526995#msg526995 by LankyYankeeWhat about if we had recognized its significance, and it could have been a Galaxy Zoo paper?
Posted