Radial distribution of stars, gas and dust in SINGS galaxies. I. Surface photometry and morphology - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




Radial distribution of stars, gas and dust in SINGS galaxies. I. Surface photometry and morphology - Astrophysics > Cosmology and Nongalactic Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: We present ultraviolet through far-infrared surface brightness profiles forthe 75 galaxies in the Spitzer Infrared Nearby Galaxies Survey SINGS. Theimagery used to measure the profiles includes GALEX UV data, optical imagesfrom KPNO, CTIO and SDSS, near-IR data from 2MASS, and mid- and far-infraredimages from Spitzer. Along with the radial profiles, we also providemulti-wavelength asymptotic magnitudes and several non-parametric indicators ofgalaxy morphology: the concentration index C 42, the asymmetry A, the Ginicoefficient G and the normalized second-order moment of the brightest 20% ofthe galaxy-s flux M 20. Our radial profiles show a wide range of morphologiesand multiple components bulges, exponential disks, inner and outer disktruncations, etc. that vary not only from galaxy to galaxy but also withwavelength for a given object. In the optical and near-IR, the SINGS galaxiesoccupy the same regions in the C 42-A-G-M 20 parameter space as other normalgalaxies in previous studies. However, they appear much less centrallyconcentrated, more asymmetric and with larger values of G when viewed in the UVdue to star-forming clumps scattered across the disk and in the mid-IR dueto the emission of Polycyclic Aromatic Hydrocarbons at 8.0 microns and very hotdust at 24 microns.



Author: J. C. Muñoz-Mateos 1, A. Gil de Paz 1, J. Zamorano 1, S. Boissier 2, D. A. Dale 3, P. G. Pérez-González 1, J. Gallego 1, B. F.

Source: https://arxiv.org/







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