SBS 1415+437 explained

SBS 1415+437
Epoch:J2000
Ra:14h 27m 01.68s
Dec:+43° 30′ 22.88″
Constellation Name:Boötes
Dist Ly:45.3 million ly
Type:Dwarf galaxy
Names:PGC 51017, SBSG 1415+437, SDSS CGB 12067.1
Z:0.002055
H Radial V:616 km/s
Appmag B:15.6
Size:10,000 ly
Size V:0.75' x 0.15'

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]

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.[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] [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

Notes and References

  1. Web site: Guseva . N. G. . May 16, 2003 . Spectroscopic and photometric studies of low-metallicity star-forming dwarf galaxies . July 22, 2024 . AaNDA.
  2. Web site: Hubble Sees an Intriguing Young-Looking Dwarf Galaxy - NASA Science . 2024-07-22 . science.nasa.gov . en-US.
  3. 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 . 10.1086/307877 . astro-ph/9905345 . 1999ApJ...525..105T . 0004-637X.
  4. López-Sánchez . A. R. . Esteban . C. . 2009-12-01 . Massive star formation in Wolf-Rayet galaxies - II. Optical spectroscopy results . Astronomy & Astrophysics . en . 508 . 2 . 615–640 . 10.1051/0004-6361/200912042 . 0910.1578 . 2009A&A...508..615L . 0004-6361.
  5. Web site: information@eso.org . Intense and short-lived . 2024-07-22 . www.esahubble.org . en.
  6. 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 . 1 . L45–L48 . 10.1086/497112 . astro-ph/0508484 . 2005ApJ...631L..45A . 0004-637X.
  7. 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 . 10.1093/mnras/stz343 . free . 0035-8711. 1901.08600 .

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