| 词条 | LEDA 2108986 |
| 释义 |
| name = LEDA 2108986 | image = LEDA_2108986.jpeg | image_size = 200px | caption = 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. | credit = Alister Graham, Canada–France–Hawaii Telescope | epoch = J2000 | constellation name = Boötes | ra = {{RA|15|03|15.557}}[1] | dec = {{DEC|+37|45|57.96}}[1] | dist_ly = {{convert|45.7|Mpc|ly|abbr=on|lk=on}} {{hub|0.678}} | type = ES, E/S0[2] | names = 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 {{Convert|45.7|Mpc|ly}} 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]ImportanceLEDA 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
References1. ^1 2 {{cite simbad|title=2MASX J15031550+3745580|accessdate=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 {{Cite journal|arxiv=1705.03587|title=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|journal=The Astrophysical Journal|volume=840|issue=2|pages=68|date=May 8, 2017|last1= Graham|first1=Alister W.|last2= Janz|first2=Joachim|last3= Penny|first3=Samantha J.|last4=Chilingarian|first4=Igor V.|last5=Ciambur|first5=Bogdan C.|last6=Forbes|first6=Duncan A.|last7=Davies|first7=Roger L.|doi=10.3847/1538-4357/aa6e56|bibcode = 2017ApJ...840...68G }} 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 3 : LEDA objects|Dwarf galaxies|Boötes |
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