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A1703 zD6
A1703 zD6 (top right)
Observation data (J2000 epoch )
Constellation	Canes Venatici
Right ascension	13 h 15 m 01.0068 s [1]
Declination	+51° 50′ 04.353″ [1]
Redshift	7.045 [1]
Heliocentric radial velocity	2,112,038 km/s (1,312,360 mi/s)
Galactocentric velocity	2,112,133 km/s (1,312,419 mi/s)
Distance	12.9  billion   ly (4.0 billion  pc ) (light travel distance) 29  billion   ly (8.9 billion  pc ) (comoving distance)
Apparent magnitude   (V)	25.8J
Other designations
[BBZ2012] A1703-zD6

A1703 zD6 is a strongly lensed Lyman-alpha emitter . It is located behind a foreground galaxy cluster known as Abell 1703 , hence its name. It has a spectroscopically determined redshift of over 7, ^[1] corresponding to a light travel time of 12.9 billion years. ^{[ citation needed ]} It is located in the Canes Venatici constellation. It was discovered in 2012, by a group led by L. D. Bradley, published in The Astrophysical Journal . ^[1]

The C IV emission line (with a wavelength of 1548 A ) was detected from this galaxy, signifying triply ionized carbon . Because it takes high amounts of energy to triply ionize carbon, it may suggest that A1703 zD6 has an active galactic nucleus (AGN), or a population of very young, hot, and metal-poor stars. ^[2] Subsequent investigations found that the ionization source is likely to be the latter: a cluster of stars (abbreviated SF, for star-forming region). ^[3]

References [ edit ]