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2011MNRAS.410..313S - Mon. Not. R. Astron. Soc., 410, 313-340 (2011/January-1)
PPAK wide-field integral field spectroscopy of NGC 628 – I. The largest spectroscopic mosaic on a single galaxy.
SANCHEZ S.F., ROSALES-ORTEGA F.F., KENNICUTT R.C., JOHNSON B.D., DIAZ A.I., PASQUALI A. and HAO C.N.
Abstract (from CDS):
The age of the stellar populations shows a negative gradient from the inner (older) to the outer (younger) regions. We found an inversion of this gradient in the central ∼ 1 kpc region, where a somewhat younger stellar population is present within a ring at this radius. This structure is associated with a circumnuclear star-forming region at ∼ 500 pc, also found in similar spiral galaxies. From the study of the integrated and spatially resolved ionized gas, we found a moderate SFR of ∼ 2.4 M☉/yr. The oxygen abundance shows a clear gradient of higher metallicity values from the inner part to the outer part of the galaxy, with a mean value of 12 + log(O/H) ∼ 8.7. At some specific regions of the galaxy, the spatially resolved distribution of the physical properties shows some level of structure, suggesting real point-to-point variations within an individual H II region. Our results are consistent with an inside-out growth scheme, with stronger star formation at the outer regions, and with evolved stellar populations in the inner ones.
Abstract Copyright: 2010 The Authors. Journal compilation2010 RAS
Journal keyword(s): techniques: spectroscopic - stars: formation - galaxies: abundances - galaxies: individual: NGC 628 (M74) - galaxies: ISM - galaxies: stellar content
Simbad objects: 2
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