Distant radio galaxies in the near IR

Details Distant radio galaxies in the near IR Distant radio galaxies in the near IR

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993egte.conf...76m&link_type=abstract

In NASA. Ames Research Center, The Evolution of Galaxies and Their Environment p 76-77 (SEE N93-26706 10-90)

Astronomy and Astrophysics

Astronomy

Astronomical Photometry, Astronomical Spectroscopy, Galactic Evolution, Infrared Spectroscopy, Lyman Alpha Radiation, Near Infrared Radiation, Radio Galaxies, Red Shift, Sky Surveys (Astronomy), Star Formation, Stellar Evolution, Stellar Spectra, Infrared Imagery, Infrared Spectra, Telescopes, Time Measurement

Scientific paper

We are carrying out a program of near IR imaging and spectroscopy of radio galaxies with redshifts of 1.5 and greater. One of its principal goals is to constrain the ages and star formation histories of massive galaxies at early epochs. The radio galaxies are drawn from the survey of 1Jy class sources by McCarthy et al (1989) and McCarthy (1990). The sample contains 18 radio galaxies with redshifts greater than 2 and an additional 10 objects with 1.5 less than z less than 2.0. The redshifts were obtained from long slit spectra with the CTIO 4 m. While the galaxies are quite faint (r approximately = 21-24.5) all have Lyman alpha emission with rest frame equivalent widths of 100 - 1000 A. Multicolor photometry in the g,r,i and J,H,K bands has been obtained with the 2.5-m Du Pont Telescope on Las Campanas and with the Hale 5 m telescope at Palomar. We have recently obtained near IR spectra, using the 4 m telescopes at KPNO and CTIO, of a few objects with the goal of determining the Lyman alpha/H-alpha ratio and hence the reddening.

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