The composite form of the supernova remnant 3C 400.2: two interacting supernova remnants or a single supernova remnant with a blow-out?

 

P. Ambrocio-Cruz,^1,2,4 M. Rosado,¹ and E. de la Fuente^1,3

 

¹ Instituto de Astronomía, UNAM, Apdo. Postal 70-264, 04510 México, D. F., México (margarit@astroscu.unam.mx).

² ITSOEH. Depto. de Ciencias Básicas, Paseo del Agrarismo No. 2000, Carretera Mixquiahuala-Tula km 2.5, 42788, Mixquiahuala, Hgo., México (patricia@astroscu.unam.mx).

³ Instituto de Astronomía y Meteorología, Depto. de Física, CUCEI, Universidad de Guadalajara, Av. Vallarta No. 2602, Col. Arcos Vallarta, 44130 Guadalajara, Jalisco, México.

 

Received 2005 May 05
Accepted 2006 May 18

 

RESUMEN

3C 400.2 es un remanente de supernova galáctico que presenta una morfología que asemeja dos cascarones de diámetros diferentes que se traslapan. Estudiamos la cinemática de ambos cascarones para saber si esta morfología especial es debida al resultado de dos explosiones de supernova diferentes, o bien, a la explosión de una única supernova en un medio que tenga un gradiente de densidad abrupto. Los datos cinemáticos concuerdan mejor con la segunda hipótesis.

 

ABSTRACT

3C 400.2 is a galactic supernova remnant with a complex morphology consisting of two overlapping shells of different diameters: a large shell to the southeastern side and a small shell to the northwestern side. In order to decide whether this morphology is due to two supernova explosions or to the blow-out of one supernova explosion in a medium with a density gradient, we study the kinematics of both shells. Hα Fabry-Perot data are more in agreement with the scenario of only one supernova explosion undergoing a blow-out due to a density gradient in clumpy media.

Key Words: ISM: KINEMATICS AND DYNAMICS - SUPERNOVA REMNANTS - SUPERNOVAE: INDIVIDUAL (3C 400.2).

 

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Acknowledgements

We thank G. Dubner for providing us with her 1465 MHz image of 3C 400.2, L. Hernández, A. Díaz, and C. Guzmán for computer help, and J. Benda for reading the manuscript. The authors acknowledge the important comments of the referee, Dr. John Dickel. This paper was done with financial support from grants 40095-F from CONACYT, and IN120802 and IN100606 from DGAPA-UNAM. E. de la F. acknowledges the financial support from CONACYT grant 124449 through graduate scholarships.

 

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