Optical Photometry and Spectroscopy of the Seyfert Galaxy SBS 0748+499

 

J. Torrealba,¹ E. Benítez,¹ A. Franco-Balderas,¹ and V. H. Chavushyan¹'²

 

¹ Instituto de Astronomía, UNAM, Apdo. Postal 70-264, 04510 Mexico D. F., Mexico (erika@astroscu.unam.mx, alfred@astroscu.unam.mx, cjanet@astroscu.unam.mx).

² Instituto Nacional de Astrofísica, Óptica y Electrónica (INAOE), Apartado Postal 51 and 216, 72000 Puebla, Pue., Mexico (vahram@astroscu.unam.mx; vahram@inaoep.mx).

 

Received: 2005 June 6
Aaccepted: 2005 September 13

 

RESUMEN

Presentamos el primer estudio óptico fotométrico de la galaxia activa SBS 0748+499. Primero mostramos los datos fotométricos en B, V, R e I: las magnitudes totales y los colores B — V, B — R y B — I; los perfiles de brillo superficial, de color y los perfiles geométricos, poniendo énfasis en la morfología y su relación con las propiedades fotométricas globales de la galaxia. Por tanto, de nuestro estudio de fotometría superficial derivamos el cociente de luminosidades bulbo-disco B/D en las cuatro bandas. Encontramos que la galaxia anfitriona muestra una barra (a ~ 8 kpc) y una estructura espiral de bajo brillo superficial, por lo que su clasificación morfológica es SBab. Adicionalmente, presentamos nuevas observaciones espectrofotométricas que muestran claramente que este objeto puede ser clasificado como galaxia Seyfert 1.9. Finalmente, estimamos la masa del agujero negro (M_BH) asociado con el núcleo de SBS 0748+499 usando la relación magnitud absoluta en la banda R del bulbo —M_BH, y la relación FWHM [O III]₅₀₀₇—σ_* con un resultado de M_BH = 2.6 x 10⁷ M_Θ y M_BH = 8.8 x 10⁷ M_Θ, respectivamente.

 

ABSTRACT

We present the first optical photometric study of the active galaxy SBS 0748+499. First, we present B, V, R, and I photometric data: total magnitudes and B — V, B — R, B — I colors; surface brightness, color and geometric profiles, with emphasis on the morphology and its relation to the global photometric properties of this galaxy. Then, from our surface photometry study we derive the bulge-to-disk luminosity ratio B/D in the four bands. We find that the host galaxy shows a bar (a ~ 8 kpc) and a low-brightness spiral structure. The morphological classification for the host galaxy of this AGN is SBab. Additionally, we present new optical spectrophotometric observations that clearly show that the object can be classified as a Seyfert 1.9 galaxy. Finally, we estimate the black hole mass (M_BH) associated with the nucleus of SBS 0748+499 using the absolute R-band bulge magnitude —M_BH relation, and the FWHM [O III]₅₀₀₇— σ_* relation. We find that M_BH = 2.6 x 10⁷ M_Θ y M_BH = 8.8 x 10⁷ M_Θ, respectively.

Key Words: GALAXIES: ACTIVE — GALAXIES: SEYFERT — GALAXIES: PHOTOMETRY — GALAXIES: INDIVIDUAL (SBS 0748+499).

  

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ACKNOWLEDGEMENTS

The authors want to acknowledge an anonymous referee for very useful comments and suggestions, which helped to improve this work. We also thank Dr. W. Lee who carefully read the final version of the typescript. J. T. acknowledges financial support from grant IN-118601 (PAPIIT-UNAM) scholarship. E. B. acknowledges grants IN-112305 (PAPIIT-UNAM) and CONACyT No. 40096-F for the support given to this research. V. Ch. acknowledges CONACyT basic research grant No. 39560-F. We also acknowledge the OAN-SPM and OAGH stafor their support during the observations. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.

 

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