Tololo 1247-232

Tololo 1247-232 (T1247)
An image from the HST WFC of T1247, which was observed in 2013 as part of Program 13027. This is a combination image (by stacking) made by William Keel (University of Alabama) in 2015. The images used are taken from Program 13027.
Observation data (J2000 epoch)
ConstellationHydra
Right ascension12h 50m 18.80s
Declination−23° 33′ 57.0″
Redshift0.0480
Distance652 million
Apparent magnitude (V)−21
Characteristics
TypeStarburst galaxy
Notable featuresLyman Continuum leaker
Other designations
Tol 1247, EC 12476-2317, To 1247,
PGC 83589

Tololo 1247-232 (Tol 1247 or T1247) is a small galaxy at a distance of 652 million light-years (200 million parsecs) (redshift z=0.0480).[1] It is situated in the southern equatorial constellation of Hydra. Visually, Tol 1247 appears to be an irregular or possibly a barred spiral galaxy.[2] Tol 1247 is named after the surveys that were carried at the Cerro Tololo Inter-American Observatory (CTIO), the first of which was in 1976.[3] It is one of nine galaxies in the local universe known to emit Lyman continuum photons.[4][5][6]

  1. ^ E. Leitet; N. Bergvall; M. Hayes; S. Linné; et al. (2013). "Escape of Lyman continuum radiation from local galaxies. Detection of leakage from the young starburst Tol 1247-232". Astronomy & Astrophysics. 553: A106. arXiv:1302.6971. Bibcode:2013A&A...553A.106L. doi:10.1051/0004-6361/201118370. S2CID 118476876.
  2. ^ U. Christoffer Fremling (6 June 2013). "Leakage of ionizing radiation from the nearby galaxy Tololo 1247-232" (PDF). The University of Stockholm. pp. 1–117. Retrieved 4 February 2015.
  3. ^ M.G. Smith; C. Aguirre; M. Zemelman (1976). "Emission-line galaxies and quasars. II - The classification systems and list N1, declination not exceeding about -27.5 deg, galactic latitude not less than about +20 deg". Astrophysical Journal Supplement Series. 32: 217–231. Bibcode:1976ApJS...32..217S. doi:10.1086/190397.
  4. ^ Dawn Erb (2016). "Cosmology: Photons from dwarf galaxy zap hydrogen". Nature. 529 (7585): 159–160. Bibcode:2016Natur.529..159E. doi:10.1038/529159a. PMID 26762452.
  5. ^ Y.I. Izotov; I. Orlitova; D. Schaerer; T.X. Thuan; A. Verhamme; N.G. Guseva; G. Worseck (2016). "Eight per cent leakage of Lyman continuum photons from a compact, star-forming dwarf galaxy". Nature. 529 (7585): 178–180. arXiv:1601.03068. Bibcode:2016Natur.529..178I. doi:10.1038/nature16456. PMID 26762455. S2CID 3033749.
  6. ^ Y. I. Izotov; D. Schaerer; T. X. Thuan; G. Worseck; N. G. Guseva; I. Orlitova; A. Verhamme (October 2016). "Detection of high Lyman continuum leakage from four low-redshift compact star-forming galaxies". MNRAS. 461 (4): 3683–3701. arXiv:1605.05160. Bibcode:2016MNRAS.461.3683I. doi:10.1093/mnras/stw1205.