Mathematics – Logic
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasj...45..487t&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 45, no. 4, p. 487-495
Mathematics
Logic
1
Galaxies, Luminosity, Masking, Quasars, Red Shift, Angular Resolution, Astronomical Models, Brightness, Cosmology
Scientific paper
Light from high-redshift QSOs often passes through foreground galaxies. If the apparent brightness of QSOs corresponding to the angular resolution is smaller than the integrated brightness of the galaxies, we may be prevented from discriminating the QSOs and galaxies, unless we use other methods, such as spectroscopic analyses. The critical QSO luminosity for this masking effect of galaxies depends on the cosmological model. In this study the equivalent QSO luminosities corresponding to the integrated galactic brightness were calculated while taking into account the evolutionary change in the galactic luminosity in models with (Omega0, lambda0 = (1.0, 0.0), (0.1, 0.0), and (0.1, 0.9); their mean values and dispersions were considered with the expected changes in the QSO luminosity function. It was found that the masking effect is the smallest and largest in the models with (Omega0, lambda0 - (1.0, 0.0), and (0.1, 0.9), respectively, and is sensitive to Omega0. It was found that, if the resolution angle is 2.5 arcseconds, it is small for QSOs with redshifts less than or equal to 5 and brighter than -24 mag.
Tagoshi Hideyuki
Tomita Kenji
Watanabe Kazuya
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