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Detection of the Polarized Broad Emission Line in the Seyfert 2 Galaxy Markarian 573
We report the discovery of the scattered emission from a hiddenbroad-line region (BLR) in a Seyfert 2 galaxy, Mrk 573, based on ourrecent spectropolarimetric observation performed at the SubaruTelescope. This object has been regarded as a type 2 active galacticnucleus (AGN) without a hidden BLR by previous observations. However,our high-quality spectrum of the polarized flux of Mrk 573 showsprominent broad (~3000 km s-1) Hα emission, broad weakHβ emission, and subtle Fe II multiplet emission. Our new detectionof these indications for the presence of the hidden BLR in the nucleusof Mrk 573 is thought to be because of the high signal-to-noise ratio ofour data, but the possibility of a time variation of the scattered BLRemission is also mentioned. Some diagnostic quantities such as the IRAScolor, the radio power, and the line ratio of the emission from thenarrow-line region of Mrk 573 are consistent with the distributions ofsuch quantities of type 2 AGNs with a hidden BLR. Mrk 573 is thought tobe an object whose level of the AGN activity is the weakest among thetype 2 AGNs with a hidden BLR. In terms of the systematic differencesbetween the type 2 AGNs with and without a hidden BLR, we brieflycomment on an interesting Seyfert 2 galaxy, Mrk 266 SW, which maypossess a hidden BLR but has been treated as a type 2 AGNs without ahidden BLR.Based on data collected at Subaru Telescope, which is operated by theNational Astronomical Observatory of Japan.
| UVBY photometry of HIPPARCOS stars
Photoelectric data in the uvby system have been obtained for 367southern stars of the Hipparcos Input Catalogue. Most of the stars are Fand G main sequence and fall in the magnitude range V = 9 to 10.
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