Leo IV

Leo IV
Ilustracja
Gwiazdy galaktyki Leo IV są niezwykle trudne do odróżnienia od obiektów tła (HST)
Odkrywca

V. Belokurov i inni

Data odkrycia

2006

Dane obserwacyjne (J2000)
Gwiazdozbiór

Lew

Typ

dSph

Rektascensja

11h 32m 57,0s[1]

Deklinacja

–00° 32′ 00″[1]

Odległość

502 tys. ly (154 kpc[1])

Przesunięcie ku czerwieni

0,000441

Jasność obserwowana

15,1[1]m

Charakterystyka fizyczna
Jasność absolutna

–5,8[1]m

Masa

19 tys. M☉[1]

Alternatywne oznaczenia
LEO IV DWARF GALAXY

Leo IV (Lew IV) – karłowata galaktyka sferoidalna znajdująca się w konstelacji Lwa w odległości około 502 tys. lat świetlnych od Słońca. Galaktyka ta jest członkiem Grupy Lokalnej oraz satelitą Drogi Mlecznej. Galaktyka Leo IV została odkryta w 2006 roku. Jest ona powiązana mostem gwiezdnym z inną karłowatą galaktyką sferoidalną Leo V.

Obrazy galaktyki Leo IV wykonane za pomocą teleskopu Hubble’a wykazały, że zaczęła ona produkować swoje gwiazdy ponad 13 miliardów lat temu, po czym nagle i gwałtownie przerwała ten proces w ciągu pierwszego miliarda lat od Wielkiego Wybuchu[2].

Przypisy

  1. ↑ a b c d e f Alan W. McConnachie. The observed properties of dwarf galaxies in and around the Local Group. „The Astronomical Journal”. 144 (1), s. 4, lipiec 2012. DOI: 10.1088/0004-6256/144/1/4. (ang.). 
  2. ↑ NASA: Teleskop Hubble bada galaktyki widma. www.spacetelescope.org, 2012-07-11. [dostęp 2012-09-10]. (pol.).

Linki zewnętrzne

Droga Mleczna
Lokalizacja
Galaktyki satelitarne
Ramiona spiralne
główne
mniejsze
Strumienie gwiazd
inne
Galaktyka Drogi Mlecznej
Galaktyka Drogi Mlecznej

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