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POX 52: A Dwarf Seyfert 1 Galaxy with an Intermediate-Mass Black Hole
We describe new optical images and spectra of POX 52, a dwarf galaxywith an active nucleus that was originally detected in the POXobjective-prism survey. While POX 52 was originally thought to be aSeyfert 2 galaxy, the new data reveal an emission-line spectrum verysimilar to that of the dwarf Seyfert 1 galaxy NGC 4395, with broadcomponents to the permitted line profiles, and we classify POX 52 as aSeyfert 1 galaxy. The host galaxy appears to be a dwarf elliptical, andits brightness profile is best fit by a Sérsic model with anindex of 3.6+/-0.2 and a total magnitude of MV=-17.6.Applying mass-luminosity-line width scaling relations to estimate theblack hole mass from the broad Hβ line width and nonstellarcontinuum luminosity, we findMBH~1.6×105Msolar. The stellarvelocity dispersion in the host galaxy, measured from the Ca IIλ8498, 8542 lines, is 36+/-5 km s-1, also suggestiveof a black hole mass of order 105Msolar. Furthersearches for active nuclei in dwarf galaxies can provide uniqueconstraints on the demographics of black holes in the mass range below106Msolar.
| Mesures de vitesses radiales. VIII. Accompagnement AU sol DU programme d'observation DU satellite HIPPARCOS
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| MK classification and photometry of stars used for time and latitude observations at Mizusawa and Washington
MK spectral classifications are given for 591 stars which are used fortime and latitude observations at Mizusawa and Washington. Theclassifications in the MK system were made by slit spectrograms ofdispersion 73 A/mm at H-gamma which were taken with the 91 cm reflectorat the Okayama Astrophysical Observatory. Photometric observations in UBV were made with the 1-meter reflector at the Flagstaff Station of U.S.Naval Observatory. The spectrum of HD 139216 was found to show a strongabsorption line of H-beta. The following new Am stars were found:HD9550, 25271, 32784, 57245, 71494, and 219109. The following new Apstars were found: HD6116, 143806, 166894, 185171, and 209260. The threestars, HD80492, 116204, and 211376, were found to show the emission inCaII H and K lines.
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Osservazione e dati astrometrici
| Costellazione: | Lucertola |
| Ascensione retta: | 22h17m49.94s |
| Declinazione: | +39°01'33.6" |
| Magnitudine apparente: | 7.4 |
| Distanza: | 212.766 parsec |
| Moto proprio RA: | 68.6 |
| Moto proprio Dec: | 15.7 |
| B-T magnitude: | 8.985 |
| V-T magnitude: | 7.531 |
Cataloghi e designazioni:
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