ISO observations of Wolf-Rayet galaxy Haro 3.
Hanlon, L.; McBreen, B.; Clavel, J.; Smith, N.; Metcalfe, L.; Laureijs, R. J.; Gallais, P.; Ott, S.; Barr, P.; Leech, K.; Delaney, M.; Steel, S. J.
Abstract
Observations of the blue compact dwarf galaxy Haro 3 have been obtained with the ISOCAM and ISOPHOT instruments on the Infrared Space Observatory (ISO). The PHT-S spectrum (6-12μm) is dominated by four emission bands that are frequently attributed to polycyclic aromatic hydrocarbons (PAHs) and strong SIV emission. Two CAM filters, LW6 (7-8.5μm) and LW3 (12-18μm) were used to map the galaxy. The LW6 image is essentially a map of the galaxy in the 7.7μm PAH feature. The emission in both maps is extended and matches very well a map of the Hα emission. Both maps show coincident single peak emission and a spatial correspondance with the nuclear region of the galaxy and the brightest optical region, an off-axis starburst containing Wolf-Rayet stars. A ratio map of LW6/LW3 images shows two peaks on a ridge elongated along the optical axis of the galaxy.