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- Leo_IV_(dwarf_galaxy) abstract "Leo IV is a dwarf spheroidal galaxy situated in the Leo constellation and discovered in 2006 in the data obtained by the Sloan Digital Sky Survey. The galaxy is located at the distance of about 160 kpc from the Sun and moves away from the Sun with the velocity of about 130 km/s. It is classified as a dwarf spheroidal galaxy (dSph) meaning that it has an approximately round shape with the half-light radius of about 130 pc.Leo IV is one of the smallest and faintest satellites of the Milky Way; its integrated luminosity is about 7004150000000000000♠15000 times that of the Sun (absolute visible magnitude of 2999450000000000000♠−5.5±0.3), which is much lower than the luminosity of a typical globular cluster. However, its mass is about 1.5 million solar masses, which means that Leo's mass to light ratio is around 150. A high mass to light ratio implies that Leo IV is dominated by the dark matter.The stellar population of Leo IV consists mainly of old stars formed more than 12 billion years ago. The metallicity of these old stars is also very low at [Fe/H] ≈ −2.58 ± 0.75, which means that they contain 400 times less heavy elements than the Sun. The observed stars were primarily red giants, although a number of Horizontal branch stars including three variable RR Lyrae stars were also discovered. The stars of Leo IV were probably among the first stars to form in the Universe. Nevertheless, the detailed study of the stellar population revealed the presence of a small number of much younger stars with the age of about 2 billion years or less. This discovery points to a complicated star formation history of this galaxy. Currently there is no star formation in Leo IV. The measurements have so far failed to detect any neutral hydrogen in it—the upper limit is just 600 solar masses.In 2008, another galaxy called Leo V was discovered in the vicinity of Leo IV. The former is located 20 kpc further from the Milky Way than the latter and 3 degrees (~ 10 kpc) away from it. These two galaxies may be physically associated with each other.".
- Leo_IV_(dwarf_galaxy) thumbnail Leo_IV_dwarf_galaxy.jpeg?width=300.
- Leo_IV_(dwarf_galaxy) wikiPageID "26017059".
- Leo_IV_(dwarf_galaxy) wikiPageLength "7368".
- Leo_IV_(dwarf_galaxy) wikiPageOutDegree "28".
- Leo_IV_(dwarf_galaxy) wikiPageRevisionID "678443396".
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Apparent_magnitude.
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Category:Astronomical_objects_discovered_in_2006.
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Category:Dwarf_spheroidal_galaxies.
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Category:Leo_(constellation).
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Category:Local_Group.
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Category:Milky_Way_Subgroup.
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Category:PGC_objects.
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Constellation.
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Dark_matter.
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Dwarf_spheroidal_galaxy.
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Epoch_(astronomy).
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Globular_cluster.
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Horizontal_branch.
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Hydrogen_line.
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Leo_(constellation).
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Leo_V_(dwarf_galaxy).
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Mass-to-light_ratio.
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Mass_to_light_ratio.
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Milky_Way.
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Neutral_hydrogen.
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink RR_Lyrae.
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Red_giant.
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Sloan_Digital_Sky_Survey.
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Solar_mass.
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Star_formation.
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Universe.
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink Visible_magnitude.
- Leo_IV_(dwarf_galaxy) wikiPageWikiLink File:Leo_IV_dwarf_galaxy.jpeg.
- Leo_IV_(dwarf_galaxy) wikiPageWikiLinkText "Leo IV (dwarf galaxy)".
- Leo_IV_(dwarf_galaxy) wikiPageWikiLinkText "Leo IV".
- Leo_IV_(dwarf_galaxy) caption "Leo IV is one of more than a dozen ultra-faint dwarf galaxies found lurking around the Milky Way galaxy.".
- Leo_IV_(dwarf_galaxy) constellationName Leo_(constellation).
- Leo_IV_(dwarf_galaxy) epoch Epoch_(astronomy).
- Leo_IV_(dwarf_galaxy) hasPhotoCollection Leo_IV_(dwarf_galaxy).
- Leo_IV_(dwarf_galaxy) name "Leo IV Dwarf Galaxy".
- Leo_IV_(dwarf_galaxy) names "Leo IV, PGC 4713561".
- Leo_IV_(dwarf_galaxy) sizeV "5.7".
- Leo_IV_(dwarf_galaxy) type "dSph".
- Leo_IV_(dwarf_galaxy) wikiPageUsesTemplate Template:Infobox_Galaxy.
- Leo_IV_(dwarf_galaxy) wikiPageUsesTemplate Template:Milky_Way.
- Leo_IV_(dwarf_galaxy) wikiPageUsesTemplate Template:Other_uses.
- Leo_IV_(dwarf_galaxy) wikiPageUsesTemplate Template:Reflist.
- Leo_IV_(dwarf_galaxy) wikiPageUsesTemplate Template:Val.
- Leo_IV_(dwarf_galaxy) subject Category:Astronomical_objects_discovered_in_2006.
- Leo_IV_(dwarf_galaxy) subject Category:Dwarf_spheroidal_galaxies.
- Leo_IV_(dwarf_galaxy) subject Category:Leo_(constellation).
- Leo_IV_(dwarf_galaxy) subject Category:Local_Group.
- Leo_IV_(dwarf_galaxy) subject Category:Milky_Way_Subgroup.
- Leo_IV_(dwarf_galaxy) subject Category:PGC_objects.
- Leo_IV_(dwarf_galaxy) hypernym Galaxy.
- Leo_IV_(dwarf_galaxy) type CelestialBody.
- Leo_IV_(dwarf_galaxy) type Galaxy.
- Leo_IV_(dwarf_galaxy) type Place.
- Leo_IV_(dwarf_galaxy) type Location.
- Leo_IV_(dwarf_galaxy) type Place.
- Leo_IV_(dwarf_galaxy) type Thing.
- Leo_IV_(dwarf_galaxy) type Q318.
- Leo_IV_(dwarf_galaxy) comment "Leo IV is a dwarf spheroidal galaxy situated in the Leo constellation and discovered in 2006 in the data obtained by the Sloan Digital Sky Survey. The galaxy is located at the distance of about 160 kpc from the Sun and moves away from the Sun with the velocity of about 130 km/s.".
- Leo_IV_(dwarf_galaxy) label "Leo IV (dwarf galaxy)".
- Leo_IV_(dwarf_galaxy) sameAs Leo_IV-dwergsterrestelsel.
- Leo_IV_(dwarf_galaxy) sameAs Leo-IV-Zwerggalaxie.
- Leo_IV_(dwarf_galaxy) sameAs しし座IV.
- Leo_IV_(dwarf_galaxy) sameAs Leo_IV.
- Leo_IV_(dwarf_galaxy) sameAs m.0b6g738.
- Leo_IV_(dwarf_galaxy) sameAs Лев_IV_(карликовая_галактика).
- Leo_IV_(dwarf_galaxy) sameAs Aslan_IV_(cüce_galaksi).
- Leo_IV_(dwarf_galaxy) sameAs Q32868.
- Leo_IV_(dwarf_galaxy) sameAs Q32868.
- Leo_IV_(dwarf_galaxy) sameAs 獅子座IV_(矮星系).
- Leo_IV_(dwarf_galaxy) wasDerivedFrom Leo_IV_(dwarf_galaxy)?oldid=678443396.
- Leo_IV_(dwarf_galaxy) depiction Leo_IV_dwarf_galaxy.jpeg.
- Leo_IV_(dwarf_galaxy) isPrimaryTopicOf Leo_IV_(dwarf_galaxy).
- Leo_IV_(dwarf_galaxy) name "Leo IV Dwarf Galaxy".
- Leo_IV_(dwarf_galaxy) name "Leo IV, PGC 4713561".