Tololo 1247-232
Tololo 1247-232 (T1247) | |
---|---|
J2000 epoch) | |
Constellation | Hydra |
Right ascension | 12h 50m 18.80s |
Declination | −23° 33′ 57.0″ |
Redshift | 0.0480 |
Distance | 652 million |
Apparent magnitude (V) | −21 |
Characteristics | |
Type | Starburst galaxy |
Notable features | Lyman 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]
Background
![](http://upload.wikimedia.org/wikipedia/commons/thumb/c/cb/4m-Victor_M._Blanco_Telescope.jpg/220px-4m-Victor_M._Blanco_Telescope.jpg)
Tol 1247-232 (T1247) was first described in 1985.[7] It was observed in the infrared using the Cerro Tololo Inter-American Observatory (CTIO) 4m telescope, as part of a study of regions of intense star formation.[7]
Six years later, T1247 was identified as an HII galaxy in the paper 'A spectrophotometric catalogue of HII galaxies', a study of 425 emission-line galaxies.
Lyman continuum leakage
T1247 is one of nine galaxies in the local universe that have been identified as leaking Lyman continuum (LyC) photons.[1][4][9] The first published detection of Lyman continuum photons from T1247 was made in 2013 by Leitet et al. using data from the Far Ultraviolet Spectroscopic Explorer (FUSE). It was the second-known LyC-leaking source in the local universe.[1]
![](http://upload.wikimedia.org/wikipedia/commons/thumb/9/92/Tololo-1247-232_v2.png/220px-Tololo-1247-232_v2.png)
LyC leakage is crucial to the process known as
See also
- Pea galaxy
- Haro 11
- Lyman-alpha forest
- Lyman series
- Precision Array for Probing the Epoch of Reionization
References
- ^ S2CID 118476876.
- ^ a b c d 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.
- doi:10.1086/190397.
- ^ PMID 26762452.
- S2CID 3033749.
- .
- ^ Bibcode:1985RMxAA..11...91M.
- Bibcode:1991A&AS...91..285T.
- S2CID 206557611.
- S2CID 1386346.
- ^ .
External links
![](http://upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png)
- Simulation of the Reionization of the Universe - A video showing the gradual reionization of a typical patch of the universe (links to YouTube).