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Date and Time of the Query: 2019-04-25 T11:57:21 PDT
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For refcode 1988A&A...196...59X:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1988A&A...196...59X Optical and far-IR luminosity functions of Markarian galaxies C. Xu, G. De Zotti, A. Franceschini, and L. Danese, International School for Advanced Studies, Strada Costiera 11, I-34014 Trieste, Italy Osservatorio Astronomico, Vicolo dell' Osservatorio 5, I-35122 Padova, Italy Dipartimento di Astronomia, Vicolo dell' Osservatorio 5, I-35122 Padova, Italy Received August 13, accepted October 24, 1987 Summary. A new optical luminosity function of Markarian galaxies is presented, which improves on earlier determinations both because of the improved data situation (the sample is complete, Zwicky magnitudes and redshifts are available for essentially all objects) and for a more accurate treatment of several effects: Tully-Fisher distances have been used for low-z-galaxies; appropriate corrections have been applied to allow for binning and errors on apparent magnitudes; the results produced by the generalized Schmidt's estimator have been compared with those given by Turner's (1979) method, to investigate the effect of inhomogeneities in the galaxy distribution. The mean surface density of Markarian galaxies has been derived taking into account the non-uniform sky coverage of the survey; these objects are found to comprise ~11% of galaxies brighter than m_ZW_ = 14.5. Luminosity functions have been constructed both including and excluding Seyferts. The contributions of "stellar" and "diffuse" objects to the space densities of non-Seyfert Markarians have been computed. IRAS data have been used to derive, exploiting survival analysis techniques to take into account also upper limits, the far-IR luminosity function. We find that Markarian galaxies comprise an important fraction of IRAS galaxies above L_IR_ ~2 10^11^ L_sun_ yet, contrary to earlier claims, they are never the dominant component. Finally, we show that the far-IR to blue luminosity ratios of these sources increase with luminosity just as expected if the bulk of the energy comes from actively star-forming regions, cocooned by dust. Key words: galaxies: active - luminosity function - infrared radiation
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