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(Abridged) We present a deep Chandra observation of the late-type barredspiral galaxy NGC 2903. The Chandra data reveal soft (kT_e ~ 0.2-0.5keV)diffuse emission in the nuclear starburst region and extending ~5kpc to thenorth and west of the nucleus. Much of this soft hot gas is likely to be fromlocal active star-forming regions; however, besides the nuclear region, themorphology of hot gas does not strongly correlate with sites of active starformation. The central ~650 pc radius starburst zone exhibits much highersurface brightness diffuse emission than the surrounding regions and a harderspectral component in addition to its soft component. We interpret the hardcomponent as being of thermal origin with kT_e~3.6keV and to be directlyassociated with a wind fluid produced by supernovae and massive star winds. Theinferred terminal velocity for this hard component, ~1100 km/s, exceeds thelocal galaxy escape velocity suggesting a potential outflow. The softerextended emission does not display an obvious outflow geometry. However, thecolumn density through which the X-rays are transmitted is lower to the west ofthe nucleus compared to the east and the surface brightness is higher theresuggesting some soft hot gas originates from above the disk; viewed directlyfrom the western zone but through the intervening galaxy disk from the easternzone. There are several point-like sources in the nuclear region with X-rayspectra typical of compact binaries. None of these are coincident with the masscenter of the galaxy and we place an upper limit luminosity from any point-likenuclear source to be < 2x10^38 ergs/s in the 0.5-8.0keV band which indicatesthat NGC 2903 lacks an active galactic nucleus. Heating from the nuclearstarburst and a galactic wind may be responsible for preventing cold gas fromaccreting onto the galactic center.

Hot Diffuse Emission in the Nuclear Starburst Region of NGC 2903