Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.242..570b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 242, Feb. 15, 1990, p. 570-575.
Astronomy and Astrophysics
Astronomy
31
Astronomical Spectroscopy, Radio Galaxies, Red Shift, Visible Spectrum, Cosmic Dust, Hubble Diagram
Scientific paper
The optical spectra of high-redshift radio galaxies are modeled with a single stellar population, but with nonstandard initial mass function. An exponentially decaying star formation rate with time-scale of about 10 Myr, or a burst with t(burst) of less than 100 Myr, can fit the spectra if there are no stars less massive than 5 solar masses, but cannot account for the K-z Hubble diagram. If the star formation rate is strictly constant, then some of the spectra can be fitted provided that there is dust with visual optical depth of about 2, and there are no stars more massive than of about 10 solar masses: this makes the Hubble diagram easier to explain, but it is difficult to match the colors of all the galaxies. For all the models, radio and optical images are expected to be aligned, and this effect should be seen in all optical wave bands. Strong Ly-alpha lines, if present, can only in part be of stellar origin.
Bithell Michael
Rees Martin J.
No associations
LandOfFree
The age of high-redshift radio galaxies 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 The age of high-redshift radio galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The age of high-redshift radio galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1843000