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Revista mexicana de astronomía y astrofísica
versión impresa ISSN 0185-1101
Rev. mex. astron. astrofis vol.48 no.2 Ciudad de México oct. 2012
The filamentary multipolar planetary nebula NGC 51891
L. Sabin,2 R. Vázquez,2 J. A. López,2 Ma. T. GarcíaDíaz,2 and G. RamosLarios3
2 Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 877, 22830 Ensenada B. C., México. (lsabin@astrosen.unam.mx, vazquez@astrosen.unam.mx, jal@astrosen.unam.mx, tere@astrosen.unam.mx).
3 Instituto de Astronomía y Meteorología, Departamento de Física, CUCEI, Universidad de Guadalajara, Av. Vallarta 2602, C.P. 44130, Guadalajara, Jal., México. (gerardo@astro.iam.udg.mx).
Received 2011 December 29.
Accepted 2012 March 5.
RESUMEN
Presentamos un conjunto de imágenes ópticas e infrarrojas combinadas con espectros de rendija larga de mediana y alta dispersión de la Nebulosa Planetaria (NP) del sur NGC 5189. La compleja morfología de esta NP es desconcertante y no había sido estudiada en detalle hasta ahora. Nuestra investigación revela la presencia de un toroide denso y frío, en el infrarrojo, el cual probablemente generó uno de los dos flujos bipolares vistos en el óptico y podría, mediante un proceso de interacción, ser también responsable de la apariencia retorcida del toroide óptico. Los espectros de alta resolución del MESAAT muestran claramente la presencia de nudos y estructuras filamentosas, así como tres burbujas en expansión. Nuestros hallazgos sugieren que NGC 5189 es una NP cuadrupolar con varios conjuntos de condensaciones simétricas en la cual la interacción de flujos determinó su compleja morfología.
ABSTRACT
We present a set of optical and infrared images combined with longslit, medium and high dispersion spectra of the southern planetary nebula (PN) NGC 5189. The complex morphology of this PN is puzzling and has not been studied in detailed so far. Our investigation reveals the presence of a new dense and cold infrared torus (alongside the optical one) which probably generated one of the two optically seen bipolar outflows and which might be responsible for the twisted appearance of the optical torus via an interaction process. The highresolution MESAAT spectra clearly show the presence of filamentary and knotty structures as well as three expanding bubbles. Our findings therefore suggest that NGC 5189 is a quadrupolar nebula with multiple sets of symmetrical condensations in which the interaction of outflows has determined its complex morphology.
Key Words: planetary nebulae: individual (NGC 5189).
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ACKNOWLEDGMENTS
This work is supported by PAPIITUNAM grant IN109509 (México). LS acknowledges a Post-Doctoral fellowship from Universidad Nacional Autónoma de México. Based on observations obtained at the Gemini Observatory (acquired through the Gemini Science Archive), which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Science and Technology Facilities Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).This research has also made use of the NASA/ IPAC Infrared Science Archive, 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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1 Based on observations obtained with the Swope and du Pont telescopes at Las Campanas Observatory and archival material from the Gemini Observatory and NASA/IPAC Infrared Science Archive.