Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-04-10
Astrophys.J. 486 (1997) L75
Astronomy and Astrophysics
Astrophysics
13 pages, AAS LaTex, 6 figures, ApJ Letters 486, L75, in press. This is the final version. Text and high quality figures also
Scientific paper
10.1086/310844
The cluster CL1358+62 displays a prominent red arc in WFPC2 images obtained with the Hubble Space Telescope. Keck spectra of the arc show Ly alpha emission at 7204 Angstrom, a continuum drop blueward of the line, and several absorption lines to the red. We identify the arc as a gravitationally lensed galaxy at a redshift of z=4.92. It is the highest redshift object currently known. A gravitational lens model was used to reconstruct images of the high-redshift galaxy. The reconstructed image is asymmetric, containing a bright knot and a patch of extended emission 0.4 arcsec from the knot. The effective radius of the bright knot is 0.022 arcsec or 130 h^-1 pc. The extended patch is partially resolved into compact regions of star formation. The reconstructed galaxy has I_AB= 24, giving a bolometric luminosity of about 3e11 Lsun. This can be produced by a star formation rate of 36 h^-2 Msun /yr (q0=0.5), or by an instantaneous star burst of 3e8 Msun. The spectral lines show velocity variations on the order of 300 km/s along the arc. The Si II line is blue shifted with respect to the Ly alpha emission, and the Ly alpha emission line is asymmetric with a red tail. These spectral features are naturally explained by an outflow model, in which the blue side of the Ly alpha line has been absorbed by outflowing neutral H I. Evidence from other sources indicates that outflows are common in starburst galaxies at high and low redshift. We have discovered a companion galaxy with a radial velocity only 450 km/s different than the arc's. The serendipitous discovery of these two galaxies suggests that systematic searches may uncover galaxies at even higher redshifts.
Franx Marijn
Illingworth Garth D.
Kelson Daniel D.
Tran K.-V.
van Dokkum Pieter G.
No associations
LandOfFree
A Pair of Lensed Galaxies at z=4.92 in the Field of CL1358+62 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A Pair of Lensed Galaxies at z=4.92 in the Field of CL1358+62, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Pair of Lensed Galaxies at z=4.92 in the Field of CL1358+62 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-82776