NOAO >   Observing Info >   Approved Programs >   2013B-0071

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Proposal Information for 2013B-0071


PI: Dinalva A Sales, Rochester Institute of Technology (Physics), dassps@rit.edu
Address: Department of Physics, College of Science, 85 Lomb Memorial Drive, Rochester, NY, 14623-5603, USA

CoI: Rogemar Riffel, Universidade Federal Santa Maria (UFSM)
CoI: Andrew Robinson, Rochester Institute of Technology (Physics)

Title: Mapping the Inner Structure of OH Megamaser Merger Galaxies

Abstract: We propose observations with GMOS IFU emission-line spectroscopy to map the kinematics and ionization structure of the kpc-scale extended emission line regions revealed by HST imaging in two OH Megamaser galaxies (OHMGs). OHMGs may represent a critical, short-lived transition phase in which massive, dense concentrations of molecular gas are triggering intense episodes of star formation and the onset of AGN fueling, resulting in rapid black hole growth. The proposed observations will form a key component of a large ongoing study of a complete sample of OHMGs using HST, Spitzer, Herschel and EVLA which has the aim of relating the merger state of the OHMG to the growth phase of the AGN, the nuclear starburst, and the concentration and structure of the ionized gas on sub-kiloparsec scales. The targets were selected to represent a range of merger states and relative strength of starburst or AGN activity. The IFU data will be used to determine the velocity field, search for outflows or inflows, and identify the ionization sources of the ionized gas and kinematic components. In this proposal, we focus on two galaxies exhibiting different morphologies and spectral types: IRAS20248+1734 is an H\sc ii galaxy that appears to be in medium-final merger state and IRASF23199+0123 is an interacting galaxy pair classified as a Seyfert 2.


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