ESO 461-36
"Stellar Glitter in a Field of Black"
Although this Hubble image appears to be full of galaxies, they are actually beyond the void, and instead form part of other galaxy clusters.[1]
Observation data (J2000 epoch)
ConstellationSagittarius[2]
Right ascension20h 03m 57.4s[3]
Declination−31° 40′ 53″[3]
Redshift0.001429[3]
Heliocentric radial velocity428.2 km/s[3]
Characteristics
TypedIrr[4]
Other designations
KK 246, LEDA 64054, HIPASS J2003-31[2]

KK 246, also known as ESO 461-036 or ESO 461-G036, is a dwarf irregular galaxy residing within the Local Void. This galaxy is the only one confirmed to be located in the Local Void, while 15 others have been tentatively identified;[5] presenting a challenge to ΛCDM, which overpopulates the voids.[6]

It has been identified as the most isolated dwarf galaxy known in the Local Volume, with no galaxies discovered within 3 Mpc (9.8 Mly).[7]

Its distance was estimated to be 7.8 ± 0.6 Mpc (25.4 ± 2.0 Mly) by Karachentsev et al. (2006) using the TRGB method, which was deemed to be too high by Tully et al. (2008) because of the reddening estimate used.

  1. ^ "Stellar Glitter in a Field of Black". European Space Agency. 2020-05-18. Retrieved 2024-04-07.
  2. ^ a b Lazaro, Enrico de (2020-05-18). "Hubble Spots Lonely Dwarf Galaxy | Sci.News". Sci.News: Breaking Science News. Archived from the original on 2024-04-07. Retrieved 2024-04-07.
  3. ^ a b c d "ESO 461-36". simbad.u-strasbg.fr. Retrieved 2024-04-07.
  4. ^ Kirby, Emma M.; Jerjen, Helmut; Ryder, Stuart D.; Driver, Simon P. (2008-10-07). "DEEP NEAR-INFRARED SURFACE PHOTOMETRY OF 57 GALAXIES IN THE LOCAL SPHERE OF INFLUENCE". The Astronomical Journal. 136 (5): 1866–1888. doi:10.1088/0004-6256/136/5/1866. ISSN 0004-6256.
  5. ^ "Hubble Sees Stellar Glitter in a Cosmic Void". NASA. 2020-05-22. Retrieved 2024-04-07.
  6. ^ Kreckel, K.; Peebles, P. J. E.; van Gorkom, J. H.; van de Weygaert, R.; van der Hulst, J. M. (2011-05-12). "KK 246: A DWARF GALAXY WITH AN EXTENDED H I DISK IN THE LOCAL VOID". The Astronomical Journal. 141 (6): 204. doi:10.1088/0004-6256/141/6/204. ISSN 0004-6256.
  7. ^ Nicholls, David C.; Jerjen, Helmut; Dopita, Michael A.; Basurah, Hassan (2013-12-13). "NEBULAR METALLICITIES IN TWO ISOLATED LOCAL VOID DWARF GALAXIES". The Astrophysical Journal. 780 (1): 88. doi:10.1088/0004-637X/780/1/88. ISSN 0004-637X.