Finding protoquasars at high redshifts

Details Finding protoquasars at high redshifts Finding protoquasars at high redshifts

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...404l..37l&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 404, no. 2, p. L37-L39.

Astronomy and Astrophysics

Astronomy

23

Active Galaxies, Cosmology, Galactic Evolution, Quasars, Red Shift, Black Holes (Astronomy), Line Spectra, Lyman Alpha Radiation, Millimeter Waves

Scientific paper

Phenomenological and theoretical arguments suggest that the progenitors of quasars form at high redshifts (greater than about 10). Searches for protoquasars may best be undertaken in the infrared or millimeter regimes; optical surveys are limited by intrinsic dust extinction or intergalactic absorption. Under plausible conditions, the emission of fine-structure lines from the host systems of quasars can be detected by millimeter telescopes. For example, the forbidden C II 158-micron line flux from a bulge surrounding a bright quasar at a redshift of 10 can reach a value of about 2 mJy. This signal will be detectable at the 3 sigma level with a 1-arcsec beam and a velocity resolution of 150 km/s after 40 minutes of observation by the future Millimeter Array telescope. Before the central activity turns on, the emission would be weaker. Detection of host systems with spatial and velocity resolutions would provide information about the origin of quasars.

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