Observaciones del remanente de supernova G296.5+10.0 con el satélite XMM-Newton
; Combi, Jorge Ariel
; Reynoso, Estela Marta 
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Fecha
07/2022
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Asociación Argentina de Astronomía
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Boletín de la Asociación Argentina de Astronomía
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1669-9521
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Resumen
G296.5+10.0 es un remanente de supernova (RSN) que presenta una morfolog´ıa bilateral de 900×650 en torno a un eje de simetr´ıa perpendicular al plano de la Galaxia en la banda de radio. El remanente muestra dos m´aximos de emisi´on en los extremos sureste y suroeste de la c´ascara de radio. Adem´as, el instrumento de rayos X EXOSAT detect´o una emisi´on extendida entre 0.1-1.2 keV con una distribuci´on axisim´etrica similar a la encontrada en radio, cuyos m´aximos coinciden en posici´on. Adem´as, se detect´o una estrella de neutrones en el centro del RSN que no es visible en la banda de radio. En este trabajo presentamos un mosaico de cinco apuntamientos en direcci´on a G296.5+10.0 usando el instrumento XMM-Newton en el modo full window, mejorando la resoluci´on espacial en un factor 5 con respecto a la mejor imagen obtenida hasta el momento por el instrumento EXOSAT en esta banda de energ´ıa. Estos datos muestran en detalle la emisi´on de rayos X asociada al remanente, donde se observa que la distribuci´on del plasma est´a contenida entre los bordes de radio del RSN. Adem´as, se observa una d´ebil emisi´on de rayos X entre 0.4-2 keV que puede ser bien ajustada con un modelo de una sola temperatura en equilibrio de ionizaci´on. El estudio espectral de este gas de rayos X permiti´o encontrar variaciones en las abundancias de algunos metales. Finalmente, con una estimaci´on de NH y el exceso de color E(B-V) del RSN, calculamos la distancia a la fuente utilizando un modelo de enrojecimiento vs distancia para la Galaxia.
G296.5+10.0 is a 900 ×650 -size supernova remnant (SNR) that displays a bilateral distribution in the radio band with the symmetry axis perpendicular to the Galactic Plane. The remnant shows two emission peaks at the South-East and South-West of the radio shell. In addition, the EXOSAT instrument detected an extended X-ray plasma with an axisymmetric distribution between 0.1-1.2 keV, being both the radio and X-ray emission peaks coincident in position. A neutron star was detected at the center of the SNR in the X-ray band but with no radio counterpart. In this work we present an X-ray mosaic of five pointings towards G296.5+10.0 performed with the satellite XMM-Newton in the full window mode, improving the spatial resolution by a factor of 5 as compared to the best image obtained so far by the EXOSAT instrument in this energy band. The XMM-Newton observations show in detail the X-ray emission associated with the remnant, where the distribution of the plasma is observed to be within the outermost radio continuum contours of the remnant. We also noted a weak X-ray emission between 0.4-2 keV that was well fitted using a ionization equilibrium model with a single temperature. Through a spectral X-ray study we found variations in the abundances of some metals. Finally, we calculated the distance to the SNR using NH from our spectral study and a Galactic reddening-distance model.
G296.5+10.0 is a 900 ×650 -size supernova remnant (SNR) that displays a bilateral distribution in the radio band with the symmetry axis perpendicular to the Galactic Plane. The remnant shows two emission peaks at the South-East and South-West of the radio shell. In addition, the EXOSAT instrument detected an extended X-ray plasma with an axisymmetric distribution between 0.1-1.2 keV, being both the radio and X-ray emission peaks coincident in position. A neutron star was detected at the center of the SNR in the X-ray band but with no radio counterpart. In this work we present an X-ray mosaic of five pointings towards G296.5+10.0 performed with the satellite XMM-Newton in the full window mode, improving the spatial resolution by a factor of 5 as compared to the best image obtained so far by the EXOSAT instrument in this energy band. The XMM-Newton observations show in detail the X-ray emission associated with the remnant, where the distribution of the plasma is observed to be within the outermost radio continuum contours of the remnant. We also noted a weak X-ray emission between 0.4-2 keV that was well fitted using a ionization equilibrium model with a single temperature. Through a spectral X-ray study we found variations in the abundances of some metals. Finally, we calculated the distance to the SNR using NH from our spectral study and a Galactic reddening-distance model.
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