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).
Crédito:ESO
Sobre la imagen
Identificador: | eso0015b |
Tipo: | Mapa |
Fecha de publicación: | 13 de Abril de 2000 |
Noticias relacionadas: | eso0015 |
Tamaño: | 800 x 597 px |
Sobre el objeto
Nombre: | MS 1008-1224 field, Spectrum |
Tipo: | Early Universe : Galaxy : Activity : AGN : Quasar |
Distancia: | z=4.0 (desplazamiento al rojo) |
Categoría: | Quasars and Black Holes |
Colores y filtros
Banda | Telescopio |
---|---|
Infrarrojo Near-IR | Very Large Telescope FORS2 |
Óptico | Very Large Telescope FORS2 |