Spectrum of 24.5-mag Quasar in MS1008 Field

The spectrum obtained with FORS2 at KUEYEN of a quasar at redshift z = 4.0, lensed by the massive cluster of galaxies MS 1008. The redshifted Lyman-alpha line from hydrogen (rest wavelength 1216 Å in the far-ultraviolet part of the spectrum) is clearly seen in emission at 6025 Å as a high peak in the red spectral region. Another emission line, from four times ionized nitrogen (rest wavelength 1240 Å), is seen in the right wing of the Lyman-alpha line. The spectrum was obtained after two hours of exposure through a 1.0 arcsec slit in good atmospheric conditions (seeing: 0.6 arcsec).

Credit:

ESO

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About the Image

Id:eso0015b
Type:Chart
Release date:13 April 2000
Related releases:eso0015
Size:800 x 597 px

About the Object

Name:MS 1008-1224 field, Spectrum
Type:• Early Universe : Galaxy : Activity : AGN : Quasar
• X - Quasars & Black Holes
Distance:z=4.0 (redshift)

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BandTelescope
Optical Very Large Telescope
FORS2
Infrared
Near-IR
Very Large Telescope
FORS2

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