| Summary: | In a recent paper, we constructed the spectral energy distributions (SEDs) for 1425 Fermi blazars. We classify them as low synchrotron peak sources (LSPs) if log ν p ( Hz ) ≤ 14.0, intermediate synchrotron peak sources (ISPs) if 14.0 < log ν p ( Hz ) ≤ 15.3 , and high synchrotron peak sources (HSPs) if log ν p ( Hz ) > 15.3 . We obtain an empirical relation to estimate the synchrotron peak frequency, ν p Eq . from effective spectral indexes α o x and α r o as log ν p Eq . = 16 + 4.238 X if X < 0 , and log ν p Eq . = 16 + 4.005 Y if X > 0 , where X = 1.0 − 1.262 α r o − 0.623 α o x and Y = 1.0 + 0.034 α r o − 0.978 α o x . In the present work, we investigate the correlation between the peak frequency and the radio-to-X-ray spectral index, between peak luminosity (bolometric luminosity) and γ-ray/optical luminosity, and between peak luminosity and bolometric luminosity. Some discussion is presented.
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