SBS 1415+437 is a blue compact dwarf galaxy and Wolf-Rayet galaxy located in the constellation Boötes. It is approximately 45.3 million light-years away from the Milky Way, and was discovered in 1995 by a team of astronomers from the University of Virginia coordinated by Trinh Thuan.[1]
| SBS 1415+437 | |
|---|---|
 | |
| Observation data (J2000 epoch) | |
| Constellation | Boötes |
| Right ascension | 14h 27m 01.68s |
| Declination | +43° 30′ 22.88″ |
| Redshift | 0.002055 |
| Heliocentric radial velocity | 616 km/s |
| Distance | 45.3 million ly |
| Apparent magnitude (B) | 15.6 |
| Characteristics | |
| Type | Dwarf galaxy |
| Size | 10,000 ly |
| Apparent size (V) | 0.75' x 0.15' |
| Other designations | |
| PGC 51017, SBSG 1415+437, SDSS CGB 12067.1 | |
It was initially thought that the galaxy hosted only very young stars, but the stars were later found to be up to 1.3 billion years old.[1][2][3]
SBS 1415+437 is also a starburst galaxy of the rare Wolf-Rayet type, as it contains an unusually large number of Wolf-Rayet stars. These are massive stars (at least 20 solar masses), short-lived, with surface temperatures of over 25,000 kelvin which, due to very strong stellar winds (over 2,000 km/s), lose large quantities of their mass (in about 100,000 years a Wolf-Rayet star can lose the equivalent of the mass of the Sun).[4][1][5] It is said the galaxy hosted a number of Red-giant branch stars apart from Wolf-Rayets as well.[6]
In 2019, astronomers found there are traces of ionized gas inside the star-forming regions of SBS 1415+437, hinting the presence of elemental abundances of chemical elements such as nitrogen, argon and sulfur.[7]
See also
edit- List of galaxies
- Kiso 5639, a similar dwarf galaxy
References
edit- ^ a b c Guseva, N. G. (May 16, 2003). "Spectroscopic and photometric studies of low-metallicity star-forming dwarf galaxies" (PDF). AaNDA. Retrieved July 22, 2024.
- ^ "Hubble Sees an Intriguing Young-Looking Dwarf Galaxy - NASA Science". science.nasa.gov. Retrieved 2024-07-22.
- ^ Thuan, Trinh X.; Izotov, Yuri I.; Foltz, Craig B. (November 1999). "The Young Age of the Extremely Metal‐deficient Blue Compact Dwarf Galaxy SBS 1415+437". The Astrophysical Journal. 525 (1): 105–126. doi:10.1086/307877. ISSN 0004-637X.
- ^ López-Sánchez, A. R.; Esteban, C. (2009-12-01). "Massive star formation in Wolf-Rayet galaxies - II. Optical spectroscopy results". Astronomy & Astrophysics. 508 (2): 615–640. doi:10.1051/0004-6361/200912042. ISSN 0004-6361.
- ^ information@eso.org. "Intense and short-lived". www.esahubble.org. Retrieved 2024-07-22.
- ^ Aloisi, A.; van der Marel, R. P.; Mack, J.; Leitherer, C.; Sirianni, M.; Tosi, M. (2005-09-01). "Do Young Galaxies Exist in the Local Universe? Red Giant Branch Detection in the Metal-poor Dwarf Galaxy SBS 1415+437". The Astrophysical Journal. 631: L45–L48. doi:10.1086/497112. ISSN 0004-637X.
- ^ Kumari, Nimisha; James, Bethan L; Irwin, Mike J; Aloisi, Alessandra (2019-02-05). "Small-scale chemical abundance analysis in a blue compact dwarf galaxy SBS 1415+437". Monthly Notices of the Royal Astronomical Society. 485 (1): 1103–1120. doi:10.1093/mnras/stz343. ISSN 0035-8711.