Sculptor dwarf galaxy
Galaxy Sculptor dwarf galaxy |
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Sculptor elliptical dwarf galaxy, imaged with the MPG / ESO 2.2 m telescope | |
AladinLite | |
Constellation | sculptor |
Position equinox : J2000.0 , epoch : J2000.0 |
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Right ascension | 01 h 00 m 09.3 s |
declination | -33 ° 42 ′ 33 ″ |
Appearance | |
Morphological type | dE / dSph |
Brightness (visual) | 8.6 likes |
Angular expansion | 39.8 ′ × 30.9 ′ |
Physical data | |
Affiliation | Local group |
Redshift | (3.67 ± 0.05) · 10 −4 |
Radial velocity | (110 ± 1) km / s |
distance | (280,000 ± 20,000) ly / (86,000 ± 6,000) pc |
Absolute brightness | (−11.07 ± 0.51) mag |
diameter | (3200 ± 200) ly |
Metallicity [Fe / H] | −1.5 |
history | |
discovery | Harlow Shapley |
Discovery date | 1937 |
Catalog names | |
PGC 3589 • ESO 351-G30 • MCG -06-03-015 • |
The Sculptor dwarf galaxy (also elliptical Sculptor dwarf galaxy or spheroidal Sculptor dwarf galaxy ) is a dwarf galaxy of early morphological type. It is a satellite of the Milky Way and is located in the constellation of the sculptor ( Latin Sculptor ). It was discovered by Harlow Shapley in 1937 . The galaxy is roughly 280,000 light years from our solar system .
The Sculptor dwarf galaxy contains only 4 percent of the carbon or other heavier elements compared to the Milky Way. This makes them comparable to the most pristine galaxies known to us in the universe .
Not to be confused with the Sculptor dwarf galaxy with the irregular Sculptor dwarf galaxy - PGC 621 - in the Sculptor group .
properties
In the year 1999 , the research group found Majewski et al. within the Sculptor dwarf galaxy a splitting into two different star populations with regard to their metallicity . One with a ratio [Fe / H] = −2.3 the other with [Fe / H] = −1.5.
Comparable to many of the other dwarf galaxies of the local group , a stronger concentration towards the center of the galaxy of the younger metal-rich population compared to the older, metal-poorer population was shown.
additional
Web links
- The Sculptor Group at SEDS
- SEDS
- ESO: A Shy Galactic Neighbor September 16, 2015
- astronews.com: Picture of the day October 6, 2015
Individual evidence
- ↑ a b c d e f g h i NASA / IPAC EXTRAGALACTIC DATABASE
- ↑ Karachentsev, ID; Kashibadze, OG: Masses of the local group and of the M81 group estimated from distortions in the local velocity field . In: Astrophysics . 49, No. 1, 2006, pp. 3-18. bibcode : 2006Ap ..... 49 .... 3K . doi : 10.1007 / s10511-006-0002-6 .
- ↑ Shapley, H. , (1938) Harvard Bull . 908 .
- ^ Shapley H: Two Stellar Systems of a New Kind . In: Nature . 142, No. 3598, 1938, pp. 715-6. bibcode : 1938Natur.142..715S . doi : 10.1038 / 142715b0 .
- ↑ Astronomers Detect Dust Around a Primitive Star, Shedding New Light on Universe's Origins Newswise, accessed January 19, 2008.
- ^ Sidney van den Bergh : Updated Information on the Local Group . In: The Publications of the Astronomical Society of the Pacific . 112, No. 770, April 2000, pp. 529-536. arxiv : astro-ph / 0001040 . bibcode : 2000PASP..112..529V . doi : 10.1086 / 316548 .