NOAO >   Observing Info >   Approved Programs >   2014B-0278

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Proposal Information for 2014B-0278


PI: Hanae Inami, NOAO, inami@noao.edu
Address: PO Box 26732, 950 North Cherry Avenue, Tucson, AZ 85726-6732, USA

CoI: Sabrina Stierwalt, University of Virginia
CoI: Lee Armus, Caltech IPAC
CoI: Sebastian Haan, The Commonwealth Scientific and Industrial Research Organisation (CSIRO)
CoI: Tanio Diaz-Santos, Caltech IPAC
CoI: Mark Dickinson, NOAO
CoI: Jason Surace, Caltech IPAC

Title: Star formation in giant clumps in NGC 1961: A local analog of high-z normal star-forming galaxies?

Abstract: NGC1961 is a luminous infrared galaxy with log(LIR/Lsun)=11.1 at z=0.013. In spite of its relatively stable spiral disk, very strong shocks were detected with Spitzer mid-infrared spectra. The shocks seem to be associated with a very extended neutral atomic hydrogen gas (HI) at north-west of the nuclues. The HI gas distribution in this region shows a strong streaming motion (velocity gradient of 400 km/s over 180''). At the west side of nucleus, giant clumps are presented which may be also related to the HI gas and caused by the fresh gas fueling from the halo. These peculiar characteristics of NGC1961 resemble high-z normal star-forming galaxies whose star formation is suggested to be mostly happened in commonly detected giant clumps. The NIFS K-band IFU observations will detect a series of the hydrogen molecular lines (H2 1-0), Br-gamma, HeI line, and the CO absorption features in NGC1961. We will explore (1) gas heating mechanism using the H2 line fluxes, (2) ages of the stellar populations based on the Br-gamma, HeI, and CO features, and (3) gas and stellar kinematics. The proposed observation will provide insights into the mechanism of the star formation in NGC1961 and also advance our understanding in high-z normal star-forming galaxies.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



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