TWO PLANES OF SATELLITES IN THE CENTAURUS A GROUP

ABSTRACT Tip of the red giant branch measurements based on Hubble Space Telescope and ground-based imaging have resulted in accurate distances to 29 galaxies in the nearby Centaurus A Group. All but 2 of the 29 galaxies lie in either of two thin planes roughly parallel with the supergalactic equator...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2015-04, Vol.802 (2), p.1-5
Main Authors: Tully, R. Brent, Libeskind, Noam I., Karachentsev, Igor D., Karachentseva, Valentina E., Rizzi, Luca, Shaya, Edward J.
Format: Article
Language:English
Subjects:
Ambiguity
Galaxies
galaxies: distances and redshifts
galaxies: groups: individual (Cen A)
Hubble Space Telescope
Imaging
large-scale structure of universe
Line of sight
Morphology
Planes
Satellites
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Summary:ABSTRACT Tip of the red giant branch measurements based on Hubble Space Telescope and ground-based imaging have resulted in accurate distances to 29 galaxies in the nearby Centaurus A Group. All but 2 of the 29 galaxies lie in either of two thin planes roughly parallel with the supergalactic equator. The planes are only slightly tilted from the line of sight, leaving little ambiguity regarding the morphology of the structure. The planes have characteristic rms long axis dimensions of ∼300 kpc and short axis dimensions of ∼60 kpc, hence axial ratios ∼0.2, and are separated in the short axis direction by 303 kpc.
ISSN:2041-8205
2041-8213
2041-8213
DOI:10.1088/2041-8205/802/2/L25