LEDA 2108986 explained

LEDA 2108986
Epoch:J2000
Constellation Name:Boötes
Ra:[1]
Dist Ly:45.7abbr=onNaNabbr=on
Type:ES, E/S0[2]
Names:2MASX J15031550+3745580, SDSS J150315.54+374558.0

LEDA 2108986,[3] also known by its Case Western Reserve University designation "Case Galaxy 611" (CG 611),[4] is an extremely isolated, early-type dwarf galaxy[5] [6] [7] with an embedded spiral structure residing in what is likely an intermediate-scale disk.[8] The galaxy was discovered in 1987 by Sanduleak and Pesch, and is located at a distance of about 45.7Mpc in the Boötes Void and has no significant neighbours within 2.5 Mpc.

The galaxy may be a counterpart to the rectangular-shaped galaxy LEDA 74886, in that they both appear to contain an intermediate-scale disk. In the case of LEDA 74886, that disk is orientated edge-on to our line-of-sight. The "early-type galaxy" class is commonly known to contain elliptical galaxies (E) with no substantial stellar disk (perhaps just a small nuclear disk) and lenticular galaxies (S0) with their large-scale disks that dominate the light at large radii. Bridging these two types of galaxies are the ES galaxies[9] with their intermediate-scale disks, referred to as "Ellicular" galaxies in recent works.[8]

Importance

LEDA 2108986 has accreted a gas disk which counter-rotates relative to its stellar disk. It also displays a young spiral pattern within this stellar disk.The presence of such faint disk structures and rotation within some dwarf early-type galaxies in galaxy clusters has often been heralded as evidence that they were once late-type spiral or dwarf irregular galaxies prior to experiencing a cluster-induced transformation, known as galaxy harassment. The extreme isolation of LEDA 2108986 is proof that dwarf early-type galaxies can be built by accretion events, as opposed to disk-stripping scenarios within the "galaxy harassment" model.

See also

Notes and References

  1. 2MASX J15031550+3745580. 20 March 2018.
  2. NED, http://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=LEDA+2108986&extend=no&hconst=67.8&omegam=0.308&omegav=0.692&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES (accessed 20 March 2018)
  3. Paturel, G., et al. (2003), HYPERLEDA. I. Identification and designation of galaxies
  4. Sanduleak, N.; Pesch, Peter (1987), The case low-dispersion northern sky survey. IV - Galaxies in the Bootes void region
  5. Hernández-Toledo, H.M., et al. (2010), The UNAM-KIAS Catalog of Isolated Galaxies
  6. Fuse, C.; Marcum, P.; Fanelli, M. (2012), Extremely Isolated Early-type Galaxies in the Sloan Digital Sky Survey. I. The Sample
  7. Argudo-Fernández, M., et al. (2015), Catalogues of isolated galaxies, isolated pairs, and isolated triplets in the local Universe
  8. 1705.03587. Implications for the origin of dwarf early-type galaxies: a detailed look at the isolated rotating dwarf early-type galaxy CG 611, with ramifications for the Fundamental Plane's SK2 kinematic scaling and the spin-ellipticity diagram. The Astrophysical Journal. 840. 2. 68. May 8, 2017. Graham. Alister W.. Janz. Joachim. Penny. Samantha J.. Chilingarian. Igor V.. Ciambur. Bogdan C.. Forbes. Duncan A.. Davies. Roger L.. 10.3847/1538-4357/aa6e56. 2017ApJ...840...68G . 54018338 . free .
  9. Liller, M.H. (1966), The Distribution of Intensity in Elliptical Galaxies of the Virgo Cluster. II
  10. Graham, Alister W.; Ciambur, Bogdan C.; Savorgnan, Giulia A.D. (2016), Disky Elliptical Galaxies and the Allegedly Over-massive Black Hole in the Compact “ES“ Galaxy NGC 1271
  11. Savorgnan, Giulia A.D. and Graham, Alister W. (2016), Explaining the reportedly overmassive black holes in early-type galaxies with intermediate-scale discs

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