Spectroscopy of five radio sources in a subsample of RC objects with steep spectra

Details Spectroscopy of five radio sources in a subsample of RC objects with steep spectra Spectroscopy of five radio sources in a subsample of RC objects with steep spectra

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999arep...43..275d&link_type=abstract

Astronomy Reports, Volume 43, Issue 5, May 1999, pp.275-283

Astronomy and Astrophysics

Astronomy

5

Scientific paper

Optical spectra for five steep-spectrum radio sources from the RC catalog are presented. The spectra were obtained using the multipupil spectrograph of the 6-m telescope of the Special Astrophysical Observatory. One of the objects was also observed using a spectrograph at Nasmyth's focus. Redshifts were derived for all the objects. Multicolor photometry was conducted for a typical representative of the sample (an optically faint host galaxy associated with an FRII radio galaxy), and used to estimate the photometric redshift of this galaxy and the age of its stellar population. The average photometric redshift for three models (Z = 2.64) coincides with the spectroscopic redshift (Z = 2.73) to within the errors. The age of this object is about one billion years, indicating that the host galaxy was formed at a redshift of 7-20, depending on the model for the Universe that is adopted.

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