ar X iv : a st ro - p h / 99 02 06 3 v 1 4 F eb 1 99 9 Simulation of Stellar Objects in SDSS Color Space
نویسنده
چکیده
We present a simulation of the spatial, luminosity and spectral distributions of four types of stellar objects. We simulate: (1) Galactic stars, based on a Galactic structure model, a stellar population synthesis model, stellar isochrones, and stellar spectral libraries; (2) white dwarfs, based on model atmospheres, the observed luminosity function , mass distribution, and Galactic distribution of white dwarfs; (3) quasars, based on their observed luminosity function and its evolution, and models of emission and absorption spectra of quasars; and (4) compact emission line galaxies, based on the observed distribution of their spectral properties and sizes. The results are presented in the color system of the Sloan Digital Sky Survey (SDSS), with realistic photometric error and Galactic extinction. The simulated colors of stars and quasars are compared with observations in the SDSS system and show good agreement. The stellar simulation can be used as a tool to analyze star counts and constrain models of Galactic structure, as well as to identify stars with unusual colors. The simulation can also be used to establish the quasar target selection algorithm for the SDSS.
منابع مشابه
ar X iv : a st ro - p h / 99 02 06 2 v 1 4 F eb 1 99 9 SOURCES OF RELATIVISTIC JETS IN THE GALAXY
متن کامل
ar X iv : a st ro - p h / 98 02 06 9 v 1 5 F eb 1 99 8 1 Beppo - SAX Observations of Galaxy Clusters
The high spatial resolution of the MECS experiment on board Beppo-SAX has encouraged a few scientists, including the author, to perform observations of galaxy clusters. Results from the analysis of the first few observed objects are encouraging. After having reviewed the Beppo-SAX observing program for galaxy clusters and referenced contributions to these proceedings by other authors on the sam...
متن کاملar X iv : a st ro - p h / 99 02 09 5 v 1 5 F eb 1 99 9 Radiospectra and Kinematics in Blazars
Broad band spectra of total and compact–scale radio emission from blazars, used in combination with kinematic information inferred from VLBI monitoring programs, can be applied successfully to better constrain the models of compact jets. We discuss here a " hands-on " approach for tying together the kinematic and spectral properties of radio emission from blazars.
متن کاملar X iv : a st ro - p h / 98 02 06 3 v 1 5 F eb 1 99 8 The Redshift Distribution of Distant Sources from Gravitational Depletion in Clusters
Gravitational lensing can be used to analyze the redshift distribution of faint galaxies. In particular the magnification bias modifies locally the galaxy number density of lensed sources observed in lensing clusters. This depletion area probes the redshift distribution of galaxies beyond B = 25. In this proceedings I present this new tool to infer the redhsift distribution of faint galaxies.
متن کامل