Cinemática e excitação do gás em galáxias com emissão megamaser de OH

Abstract

We present a multiwavelength study of galaxies that host OH Megamaser emission. We used integral field unit spectroscopic data obtained with the GMOS-IFU instrument, radio data obtained with VLA and HST data for IRASF23199+0123 and IRAS03056+2034. From this data we are able to obtain information about gas dynamics and excitation in the galaxies IRASF23199+0123 and IRAS03056+2034. The main goals of this work are the identification of the central engine that ionizes the gas in these objects e propose a scenario in order to justify the OH megamaser emission. The observations of IRASF23199+0123 allow us to show that this system is formed by two interacting galaxies, in which the eastern member (IRAS23199E) presents two OH Megamaser emission hosts and the two members present extended radio emission in 3 and 20cm with the peak at the nucleus. The IFU spectroscopic data covers the inner region of IRAS23199E with 6 kpc and 2.3kpc of resolution. The flux maps constructed from this data reveal three extranuclear regions that are attributed to star forming complexes. We discovered a Seyfert 1 nucleus in IRAS23199E, due to the detection of a broad component, in the H emission-line from the BLR. Besides, the gas kinematics analysis suggests the presence of non circular motions that could be associated to the presence of outflows from the nucleus and inflows in its vicinity. The data analysis for IRAS03056+2034 does not indicate morphological evidence of interactions with other galaxies, but indicates several star forming regions along the spiral arms. The comparison between GMOS-IFU and HST observations allows the identification of a circumnuclear star forming ring. We built diagnostic diagrams that in addiction with the brightness temperature value and spectral index allow us to conclude that the gas excitation is due to not only to Starburst but also due to the presence of an AGN. The analysis of the gas kinematics suggests the presence of inflows towards to the nucleus, and coincident to the position of a patchy spiral arms that is observed in the HST image.