|
Dorado Group
The Dorado Group is a loose concentration of galaxies containing both spirals and ellipticals. It is generally considered a 'galaxy group' but may approach the size of a 'galaxy cluster'. It lies primarily in the southern constellation Dorado and is one of the richest galaxy groups of the Southern Hemisphere. Gérard de Vaucouleurs was the first to identify it in 1975 as a large complex nebulae II in the Dorado region, designating it as G16. Characteristics A rough distance estimate from NGC 1549 (using the Hubble constant as 70) put the cluster at 18.4 megaparsecs (Mpc). The Cepheid distance estimate from Freedman et al. 2001 is 15.3 Mpc. Based upon the 2001 work of Tonry et al. the surface brightness fluctuation (SBF) of six member galaxies was averaged and adjusted to estimate the group's distance at in 2007. At the center of the cluster lie interacting galaxies NGC 1549 and NGC 1553. The dominant group members, ordered by luminosity, are: spiral NGC 1566, lenticular N ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sig05-013 Small
Sig used as a name may refer to: *Sig (given name) *Sig, Algeria, a city on the banks of the Sig River *Sig Alert, an alert for traffic congestion in California, named after Loyd Sigmon *Sig River, a river of Algeria also known as Mekerra sig (lower case) may refer to: *sig (rune), an Armanen rune, later used for the Schutzstaffel (SS) logo *sig, the distinctive hand actions of sign language that form words; see movement (sign language) * .sig, a signature block in e-mail messaging ''sig'' as a loanword may refer to: *''sig'' (Russian), the common whitefish; see ''Coregonus'' *''Sig'' (Italian), abbreviation of ''Signore'' ("Lord") *''Sig.'' (Latin, also ''Signa'' or ''Signatura''), the "signature" section of a medical prescription, which contains directions to the patient, and the signature of the prescribing doctor *Sig. Signaling ( in R''ail transport'') the signals and associated equipment required for their operation. SIG (capitalized) may refer to: *SIG, the IATA Callsign o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
