LEDA 2108986

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LEDA 2108986
LEDA 2108986.jpeg
False color image of galaxy LEDA 2108986, taken by the Canada–France–Hawaii Telescope. The contrast of this image has been adjusted to highlight the internal bar/spiral structure.
Observation data (J2000 epoch)
Constellation Boötes
Right ascension 15h 03m 15.557s [1]
Declination +37° 45 57.96 [1]
Distance 45.7  Mpc (149,000,000  ly) h1
0.678
Characteristics
Type ES, E/S0 [2]
Other designations
2MASX J15031550+3745580, SDSS J150315.54+374558.0 [1]

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 45.7 megaparsecs (149,000,000 ly) in the Boötes Void and has no significant neighbours within 2.5 Mpc.

Contents

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

Related Research Articles

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<span class="mw-page-title-main">Elliptical galaxy</span> Spherical or ovoid mass of stars

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<span class="mw-page-title-main">Spiral galaxy</span> Class of galaxy that has spiral structures extending from their cores.

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<span class="mw-page-title-main">Lenticular galaxy</span> Class of galaxy between an elliptical galaxy and a spiral galaxy

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<span class="mw-page-title-main">Dwarf spiral galaxy</span> Dwarf counterparts of spiral galaxies

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<span class="mw-page-title-main">Sérsic profile</span>

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<span class="mw-page-title-main">LEDA 74886</span> Dwarf galaxy in the constellation Eridanus with a rectangular shape

LEDA 74886, also known by its 2MASX designation 2MASX J03404323-1838431, and sometimes known as the Emerald-cut Galaxy, is a dwarf galaxy with a rare rectangular shape. It is located at a distance of about 70,000,000 light-years (21 Mpc) in the Eridanus constellation. The galaxy was detected in a wide field of view image taken by the Subaru Telescope using the Subaru Prime Focus Camera (Suprime-Cam). Using the Keck Telescope, a thin disc with a side on orientation was confirmed to be lurking at the center of LEDA 74886, and spinning at a speed of 33 km/s at the orbital radius of half a kpc. LEDA 74886 has a mass of around 109M (Compared to the Milky Way's mass of about 1012M).

<span class="mw-page-title-main">NGC 1277</span> Galaxy in the constellation Perseus

NGC 1277 is a lenticular galaxy in the constellation of Perseus. It is a member of the Perseus Cluster of galaxies and is located approximately 73 Mpc (megaparsecs) or 220 million light-years from the Milky Way. It has an apparent magnitude of about 14.7. It was discovered on December 4, 1875 by Lawrence Parsons, 4th Earl of Rosse.

<span class="mw-page-title-main">NGC 128</span> Elliptical galaxy in Pisces

NGC 128 is a lenticular galaxy in the constellation Pisces. It is approximately 190 million light-years from the Sun and has a diameter of about 165,000 light-years.

<span class="mw-page-title-main">NGC 4488</span> Galaxy in the constellation of Virgo

NGC 4488 is a lenticular galaxy located about 60 million light-years away in the constellation of Virgo. The galaxy was discovered by astronomer William Herschel on December 28, 1785. NGC 4488 is a member of the Virgo Cluster.

<span class="mw-page-title-main">NGC 4469</span> Spiral galaxy in the constellation of Virgo

NGC 4469 is a nearly edge-on spiral galaxy located about 55 million light-years away in the constellation of Virgo. It is also classified as a LINER galaxy. NGC 4469 was discovered by astronomer William Herschel on April 15, 1784. It is a member of the Virgo Cluster.

<span class="mw-page-title-main">NGC 1271</span> Galaxy in the constellation Perseus

NGC 1271 is a compact elliptical or lenticular galaxy located about 250 million light-years away in the constellation Perseus. The galaxy was discovered by astronomer Guillaume Bigourdan on November 14, 1884. NGC 1271 is a member of the Perseus Cluster and has a nuclear dust disk in its center. It also has an edge-on, intermediate-scale disk and has a central bulge. Like NGC 1277, NGC 1271 is a candidate "relic galaxy".

References

  1. 1 2 3 "2MASX J15031550+3745580". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 20 March 2018.
  2. NED, (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. 1 2 Graham, Alister W.; Janz, Joachim; Penny, Samantha J.; Chilingarian, Igor V.; Ciambur, Bogdan C.; Forbes, Duncan A.; Davies, Roger L. (May 8, 2017). "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. arXiv: 1705.03587 . Bibcode:2017ApJ...840...68G. doi: 10.3847/1538-4357/aa6e56 . S2CID   54018338.
  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