The Classifications and Some Correlations for Fermi Blazars

In a recent paper, we calculate spectral energy distributions (SEDs) for 1425 Fermi blazars, classifications of low synchrotron peak sources (LSPs) if log νp(Hz) ≤ 14.0, intermediate synchrotron peak sources (ISPs) if 14.0 < log νp(Hz) ≤ 15.3, and high synchrotron peak sources (HSPs) if log νp(Hz) > 15.3 are made based on 999 logarithms of synchrotron peak frequencies with known redshift, and we obtain an empirical relation to estimate the synchrotron peak frequency, ν Eq. p from effective spectral indexes αox and αro as log ν Eq. p = 16 + 4.238X if X < 0, and log ν Eq. p = 16 + 4.005Y if X > 0, where X = 1.0− 1.262αro − 0.623αox, and Y = 1.0 + 0.034αro − 0.978αox [1]. In the present work, we investigate the correlation between the peak frequency and the radio to X-ray spectral index, that between peak luminosity (integrated luminosity) and γ-ray/optical luminosity, and that between peak luminosity and integrated luminosity. Some discussions are presented.