An Infrared Emission Line Galaxy at z = 2.43

Details An Infrared Emission Line Galaxy at z = 2.43 An Infrared Emission Line Galaxy at z = 2.43

1998-04-22

arxiv.org/abs/astro-ph/9804226v1

Astronomy and Astrophysics

Astrophysics

ApJ in press, 21 pages, 2 figures. Also available at http://www.mpia-hd.mpg.de/MPIA/Projects/STARS/preprints.html

Scientific paper

10.1086/306063

An object discovered during an infrared survey of the field near the quasar B2 0149+33 has an emission line at 2.25$\mu$m that we interpret as H$\alpha$ at a redshift of 2.43. The K-band image shows two compact components 10 kpc apart surrounded by more extended emission over ~20 kpc. The H$\alpha$ emission appears to be extended over ~15 kpc (2") in a coarsely sampled (0".8/pixel) image. The star formation rate may be as high as 250 - 1000 M$_\odot$ yr$^{-1}$, depending on the extinction. Alternatively, the line may be powered by an active nucleus, although the probability of serendipitously discovering an AGN in the survey volume is only ~0.02. The increasing number of similar objects reported in the literature indicate that they may be an important, unstudied population in the high redshift universe.

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