Gemini 3D spectroscopy of Haro 15: Solving the dilemma of galactic rotation and starburst kinematics

FIRPO, V.; BOSCH, G.; HÄGELE, G. F.; DÍAZ, R.

San Francisco- California

Congreso; 2012 Gemini Science and User Meeting; 2012

Gemini Observatory

The most intense star-forming regions in the BCD galaxy Haro 15 have shown a peculiar kinematic behavior in our high resolution spectra which provided information regarding the motion of the individual knots in the galaxy potential. We focus our study in their kinematic structure with the purpose of distinguishing the presence of different components with different velocities which could be contributing to the observed widths in the global emission profile. Using high quality Integral Field Unit (IFU) data from GMOS-S, we mapped the velocity fields and flux distribution from fits to the Halpha and [OIII] emission lines. The observed kinematic structure in Haro 15 has shown to be extremely complex, combining an evident rotation around a preferential axis with local deviations in and/or around star-forming regions. With the high spatial resolution IFU data we are able to explain the double peak profile seen in knot A as being due to the presence of a blue-shifted outflow component. The external bright star forming region (knot B) is located next to a giant shell structure, suggesting that the starburst phenomenon was triggered by an ancient supernova burst.