User:RedHummingbird/sandbox
| Hen 2-10 | |
|---|---|
.jpg) A composite image of Hen 2-10. Visual data comes from Hubble, X-ray data comes from the Chandra X-Ray Observatory, and radio data comes from the Very Large Array. | |
| Observation data (J2000 epoch) | |
| Constellation | Pyxis |
| Right ascension | 08h 36m 15s [1] |
| Declination | −26° 24′ 34″[1] |
| Redshift | 0.002912[1] |
| Heliocentric radial velocity | 873 km/s[1] |
| Galactocentric velocity | 657 km/s[1] |
| Distance | 34.24 Mly[1] |
| Apparent magnitude (V) | 11.09 (R Band)[1] |
| Characteristics | |
| Type | dwarf |
| Mass | ~1×1010[2] M☉ |
| Apparent size (V) | 1.8'[1] |
| Other designations | |
| ESO 495-21, MCG-04-21-005, PGC 24171/24175 [1] | |
Hen 2-10, also known as He 2-10 and Henize 2-10, is a dwarf galaxy located 34 million light years away in the constellation of Pyxis.[1] It is the first dwarf galaxy ever discovered that contains, at its center, a supermassive black hole.[3] This discovery was surprising since the black hole was about one quarter of the size of the black hole at the center of the Milky Way Galaxy, despite the fact that the galaxy is roughly one thousandth the size of the Milky Way. This discovery suggests that the black holes found at the center of most large galaxies may have formed before the galaxies themselves.[4] Recent estimates have placed the mass of this black hole around , and the mass of the entire dwarf galaxy at about .[2]
Structure
Central black hole
References
- ^ a b c d e f g h i j "NED entry for HE 2-10". Retrieved 1 June 2011.
- ^ a b Reines, Amy E.; Reynolds, Mark T.; Miller, Jon M.; Sivakoff, Gregory R.; Greene, Jenny E.; Hickox, Ryan C.; Johnson, Kelsey E. (2016). "Deep Chandra Observations of the Compact Starburst Galaxy Henize 2-10: X-rays from the Massive Black Hole". The Astrophysical Journal Letters,. 830. arXiv:1610.01598. doi:10.3847/2041-8205/830/2/L35.
{{cite journal}}: CS1 maint: extra punctuation (link) CS1 maint: unflagged free DOI (link) - ^ Kaufman, Rachel (10 January 2011). "Huge Black Hole Found in Dwarf Galaxy". National Geographic. Retrieved 1 June 2011.
- ^ Grossman, Lisa (10 January 2011). "Baby Galaxy Hosts Monster Black Hole". Wired News. Retrieved 3 July 2011.
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