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Galaxy in the constellation Boötes From Wikipedia, the free encyclopedia
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.
LEDA 2108986 | |
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![]() 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) h−1 0.678 |
Characteristics | |
Type | ES, E/S0[2] |
Other designations | |
2MASX J15031550+3745580, SDSS J150315.54+374558.0[1] |
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]
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.
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