New Infrared Seyfert Galaxies

We present optical spectra for new infrared Seyfert galaxies obtained with the 2.16m telescope at Bei-jing Astronomical Observatory (BAO). After wavelength and flux calibration, they are classified by the degree of nuclear activity: nine Seyfert 2 and three Seyfert 3 galaxies. In addition, by using the data from de Grijp et al.(1992), we find that (1) there exists a tight correlation between luminosities of far-infrared (L FIR) and Hα (L Hα) for both Seyfert and HII-like (starburst) galaxies; (2) the median value of Hα luminosities of Seyfert 1s is one magnitude larger than that of Seyfert 2s and starburst galaxies; (3) the cumulative distributions of FIR luminosities and in-frared spectral index α(100, 60) for Seyfert 1s and 2s are similar to that of starburst galaxies. We conclude that most of the far-infrared emission from Seyfert 2 galaxies is due to the violent nuclear/circumnuclear starburst, rather than the nonthermal activity in the nucleus, this may also be the case for many Seyfert 1s as well.