NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-05-23 T20:06:11 PDT
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For refcode 2015PASJ...67L...1M:
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NED Abstract

Copyright by Astronomical Society of Japan. 2015PASJ...67L...1M Witness of gas infall and outflow in the young starburst dwarf galaxy NGC 5253 Miura, Rie E.; Espada, Daniel; Sugai, Hajime; Nakanishi, Kouichiro; Hirota, Akihiko Abstract. We present ^12^CO(2-1) observations towards the dwarf galaxy NGC 5253 using the Submillimeter Array. The data shows that a large amount of molecular gas is located in the central ~ 200 pc starburst region, physically associated with two young super stellar clusters (SSCs). The molecular gas traced by ^12^CO(2-1) is elongated along the minor axis (dust lane) of the galaxy and its kinematics suggest that there is an inflow of molecular gas to the direction of the central SSCs, as is also observed in H I gas at a larger scale. Due to their correlation in spatial and velocity domains, the central SSCs were likely formed from molecular gas in the nucleus. We compare the ^12^CO(2-1) with available H_2_ 1-0 S(1) data, and show that while the relatively cold gas traced by ^12^CO(2-1) is distributed around the central starburst region but also along the dust lane, the warm gas traced by H_2_ 1-0 S(1) is associated with the central H II region and other star-forming regions. Interestingly, a cavity in the H_2_ 1-0 S(1) emission is found to be spatially correlated with a Halpha shell. This Halpha shell may trace a bipolar outflow from the central SSCs and the H_2_ 1-0 S(1) gas, the gas shocked by the outflow encountering the surrounding quiescent gas. We calculate a molecular gas inflow rate of ~ 2 M_sun_ yr^-1^, a star formation rate of 0.3-0.5 M_sun_ yr^-1^, and an ionized gas outflow being emitted from the SSCs with a rate of (5-25)x 10^-3^ f M_sun_ yr^-1^, where f is a volume filling factor. Key words: galaxies: individual (NGC 5253), galaxies: starburst, ISM: jets and outflows
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