Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.1907r&link_type=abstract
American Astronomical Society, 191st AAS Meeting, #19.07; Bulletin of the American Astronomical Society, Vol. 29, p.1242
Astronomy and Astrophysics
Astronomy
Scientific paper
The luminosity function (LF) for radio sources was determined at nu =1.4 GHz and lambda =60mu by correlating infrared sources from the Strauss 1.2 Jy IRAS Redshift Survey with their radio counterparts in the NRAO VLA Sky Survey (NVSS). The sample was limited to those galaxies with known redshift and S_{60mu } > 2.00 Jy within two regions of the completed NVSS Sky Survey given by the following coordinates: 4h<=alpha <16h, delta >=30(deg) and -40(deg) <=delta <=-10(deg) . The radio-far-infrared correlation was derived and accurate positions for IRAS Redshift Survey sources were obtained through the correlation process. Luminosity distributions for nu =1.4 GHz and lambda =60mu were then constructed. A determination of the characteristic volume for a given distance and luminosity interval was used to construct the luminosity functions corresponding to the distributions. A chi (2) analysis of the observed distributions and functions yields the Schechter parameters corresponding to the analytic distributions and functions. The analytic distribution at 1.4 GHz is well described by the sum of two Schechter functions with L1(*) =(3.98+/-0.31)x 10(22) W Hz(-1) and L2(*) =(24.78+/-3.84)x 10(22) W Hz(-1) , respectively. The analytic distribution at lambda =60mu is also given by two best-fit curves with L1(*) =(14.00+/-1.20)x 10(9) L_sun and L2(*) =(79.75+/-9.78)x 10(9) L_sun. The 1.4 GHz luminosity function is fitted with one curve with L(*) =(2.80+/-0.15)x 10(22) W Hz(-1) and the 60mu luminosity function is fitted with two curves with L1(*) =(9.16+/-0.84)x 10(9) L_sun and L2(*) =(46.57+/-3.08)x 10(9) L_sun, respectively. Two distinct populations are identified in the radio and far-infrared luminosity functions: 1) normal late-type galaxies; and 2) starburst/AGN population of galaxies. The former matches the spiral population of Condon. The latter can be identified with Condon's but is not identical (Note: all calculation use a Hubble constant value of Ho = 75 km s(-1) Mpc(-1) ).
Reddy Naveen A.
Yun Min. S.
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