Schechter Function Model for the QSO Luminosity Function from the SDSS DR7
| Autor: | Salam Ajitkumar Singh, K. Yugindro Singh, I. Ablu Meitei |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
QSOS
Physics Polynomial 010504 meteorology & atmospheric sciences media_common.quotation_subject Young stellar object Astrophysics::Instrumentation and Methods for Astrophysics Astronomy Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences Redshift Luminosity Sky 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics Mass-to-light ratio Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences media_common Luminosity function (astronomy) |
| Zdroj: | International Journal of Astronomy and Astrophysics. :247-253 |
| ISSN: | 2161-4725 2161-4717 |
| DOI: | 10.4236/ijaa.2016.63020 |
| Popis: | A study of the optical luminosity function of Quasi Stellar Objects (QSOs) and its evolution with redshift is carried out using the data from the Sloan Digital Sky Survey Data Release Seven (SDSS DR7). It is shown that the observed QSO luminosity function is well fitted by a Schechter function model of the form , where is the break or characteristic luminosity with luminosity evolution characterized by a second order polynomial in red shift. The best fit parameters are determined by using the Levenberg-Marquardt method of nonlinear least square fit. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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