Integral field spectroscopy of Markarian 273: Mapping high-velocity gas flows and an off-nucleus Seyfert 2 nebula
Integral field optical spectroscopy with the INTEGRAL fiber-based system is used to map the extended ionized regions and gas flows in Mrk 273, one of the closest ultraluminous infrared galaxies. The Hβ and [O III] λ5007 maps show the presence of two distinct regions separated by 4″ (3.1 kpc) along p...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 1999 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/199205 |
| Acceso en línea: | http://hdl.handle.net/10261/199205 |
| Access Level: | acceso abierto |
| Palabra clave: | Galaxies: active Galaxies: individual (Markarian 273) Galaxies: interactions Galaxies: nuclei Galaxies: seyfert Galaxies: starburst |
| Sumario: | Integral field optical spectroscopy with the INTEGRAL fiber-based system is used to map the extended ionized regions and gas flows in Mrk 273, one of the closest ultraluminous infrared galaxies. The Hβ and [O III] λ5007 maps show the presence of two distinct regions separated by 4″ (3.1 kpc) along position angle (P.A.) 240°. The northeastern region coincides with the optical nucleus of the galaxy and shows the spectral characteristics of LINERs. The southwestern region is dominated by [O III] emission and is classified as a Seyfert 2. Therefore, in the optical, Mrk 273 is an ultraluminous infrared galaxy with a LINER nucleus and an extended off-nucleus Seyfert 2 nebula. The kinematics of the [O III] ionized gas shows (1) the presence of highly disturbed gas in the regions around the LINER nucleus, (2) a high-velocity gas flow with a peak-to-peak amplitude of 2.4 × 103 km s-1, and (3) quiescent gas in the outer regions (at 3 kpc). We hypothesize that the high-velocity flow is the starburst-driven superwind generated in an optically obscured nuclear starburst and that the quiescent gas is directly ionized by a nuclear source, similar to the ionization cones typically seen in Seyfert galaxies. |
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