A Search for Low-Luminosity ``Type 1'' AGNs

Details A Search for Low-Luminosity ``Type 1'' AGNs A Search for Low-Luminosity ``Type 1'' AGNs

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...18912209h&link_type=abstract

American Astronomical Society, 189th AAS Meeting, late abstracts, #122.09; Bulletin of the American Astronomical, Vol. 29, p. 73

Statistics

Scientific paper

We present the results of an optical spectroscopic survey designed to search for low-luminosity Seyfert nuclei in a magnitude-limited (B_T<= 12.5 mag) sample of 486 bright, northern galaxies. Moderate-resolution spectra of exceptionally high quality were obtained in part to detect broad Hα emission, similar in character to, but much weaker than, the broad permitted lines that define type 1 Seyfert nuclei. Of the 211 emission-line galaxies classified as having Seyfert or LINER (low-ionization nuclear emission-line region) nuclei in our survey, the broad Hα line was detected with confidence in 34 objects, and with less certainty in another 12. Most of the detections are reported for the first time, and the detection rate represents a lower limit to the true incidence of active nuclei harboring a broad emission-line region. These statistics imply that broad-lined (``type 1'') active nuclei are much more common than previously believed: they exist in at least 20% of all galaxies spectroscopically classified to be ``active'' and in more than 10% of all luminous galaxies at the current epoch. Excluding nine well-known Seyfert 1 nuclei, the broad Hα line of the remaining sample has a median luminosity of ~ 1x 10(39) ergs s(-1) and a median full width at half maximum ~ 2200 km s(-1) . It constitutes approximately 30% of the total emission of the Hα and [N II] lambda lambda 6548, 6583 blend. Several objects have broad Hα luminosities as low as (1--3)x 10(38) ergs s(-1) , several orders of magnitude fainter than in traditionally studied AGNs.

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