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• W3104953062 abstract "view Abstract Citations (108) References (33) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Striking Near-Infrared Morphology of the Inner Region in M100 Knapen, J. H. ; Beckman, J. E. ; Shlosman, I. ; Peletier, R. F. ; Heller, C. H. ; de Jong, R. S. Abstract New optical and near-infrared (NIR) X-band images of the inner 3 kpc region of the nearby Virgo spiral M100 (NGC 4321) display remarkable morphological changes with wavelength. While in the optical the light is dominated by a circumnuclear zone of enhanced star formation, the morphological features in the 2.2 micron image correspond to a newly discovered kiloparsec-size stellar bar and a pair of leading arms situated inside an ovally shaped region. Analysis of the K image confirms its symmetry: only a very small percentage of the flux, some 5%, is emitted in antisymmetric structures. This indicates that the overall morphology observed in the NIR is dominated by a global density wave. Making a first-order correction for the presence of localized dust extinction in the K light using the I - K image, we find that the observed leading arm morphology is not caused or enhanced but in fact slightly hidden by dust. Possible mechanisms responsible for the optical and NIR morphology are discussed, and tests are proposed to discriminate between them. Our dynamical conclusions are supported with an evolutionary stellar population model reproducing the observed optical and NIR colors in a number of star-forming zones. We argue that the observed morphology is compatible with the presence of a pair of inner Lindblad resonances in the region and show this explicitly in an accompanying paper by detailed numerical modeling. The phenomena observed in NGC 4321 may provide insight into physical processes leading to central activity in galaxies. Publication: The Astrophysical Journal Pub Date: April 1995 DOI: 10.1086/187839 arXiv: arXiv:astro-ph/9502031 Bibcode: 1995ApJ...443L..73K Keywords: Density Wave Model; Galactic Evolution; Infrared Astronomy; Infrared Spectra; Morphology; Near Infrared Radiation; Spiral Galaxies; Star Formation; Stellar Models; Virgo Galactic Cluster; Visible Spectrum; Galactic Structure; Hydrodynamics; Infrared Spectroscopy; Interstellar Extinction; Optical Emission Spectroscopy; Astrophysics; GALAXIES: EVOLUTION; GALAXIES: INDIVIDUAL MESSIER NUMBER: M100; GALAXIES: INDIVIDUAL NGC NUMBER: NGC 4321; GALAXIES: ISM; GALAXIES: STARBURST; GALAXIES: STRUCTURE; HYDRODYNAMICS; Astrophysics E-Print: 8 pages: postscript,compressed,uuencoded. 8 compressed postscript figures available at ftp://asta.pa.uky.edu/shlosman/lett100/, mget *.eps.Z To appear in ApJ. Letters full text sources arXiv | ADS | data products SIMBAD (7) NED (1) MAST (1) ESA (1)" @default.
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• W3104953062 title "The striking near-infrared morphology of the inner region in M100" @default.
• W3104953062 doi "https://doi.org/10.1086/187839" @default.
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