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Revista mexicana de astronomía y astrofísica
Print version ISSN 0185-1101
Rev. mex. astron. astrofis vol.45 n.2 Ciudad de México Oct. 2009
A premerger in the Luminous Infrared System IRAS 02290+2533
Fidel Cruz1 and Héctor Aceves2
1 Bahía San Quintín, Ensenada, B. C., México. (fidelcru@gmail.com).
2 Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 877, 22800 Ensenada, B. C., México. (aceves@astrosen.unam.mx).
Received 2008 October 21
Accepted 2009 August 3
RESUMEN
Reportamos imágenes y fotometría obtenidas en el óptico y cercano infrarrojo, de la fuente IRAS 02290+2533. Las observaciones muestran que esta fuente es un sistema de tres galaxias. Dos galaxias (A y B), cuya separación proyectada es de ≈ 10kpc, muestran evidencias de una interacción de marea entre ellas. La galaxia tipo espiral B presenta una emisión extendida en Hα y una luminosidad infrarroja alta, desde longitudes de onda cercanas a medias. Sugerimos que tal luminosidad se debe a un brote de formación estelar, que abarca probablemente casi todo el disco, originado por la interacción gravitacional en curso con la galaxia A. La galaxia B puede ser clasificada como una Galaxia Infrarroja Luminosa (LIRG). Estimamos que una fusión binaria de galaxias puede ocurrir en el sistema dentro de 1 Gyr. Es probable que esta fuente IRAS albergue en un futuro una galaxia Ultra LIRG, en concordancia con el modelo evolutivo de Sanders & Mirabel (1996).
ABSTRACT
We report optical and nearinfrared imaging and photometry for the IRAS 02290+2533 source. Observations show that this source is a system of three galaxies. Two galaxies (A and B), which are separated in projection ≈ 10kpc, show some evidence of tidal interaction between them. The spirallike Galaxy B presents a diskwide Ha emission and a high infrared luminosity, from near to midinfrared wavelengths. We suggest that such luminosity is due to a probable diskwide starburst triggered by the ongoing gravitational interaction with Galaxy A. Galaxy B can be classified as a Luminous Infrared Galaxy (LIRG). We estimate that a binary merger in the system is likely to occur in 1 Gyr. It is probable that this IRAS source will harbor in the future an Ultra LIRG, according to the evolutionary scheme of Sanders & Mirabel (1996).
Key Words: galaxies: interactions galaxies: photometry infrared: galaxies infrared: general.
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