2005A&A...441..491V


C.D.S. - SIMBAD4 rel 1.7 - 2019.07.18CEST16:10:33

2005A&A...441..491V - Astronomy and Astrophysics, volume 441, 491-511 (2005/10-2)

Dissecting the spiral galaxy M83: mid-infrared emission and comparison with other tracers of star formation.

VOGLER A., MADDEN S.C., BECK R., LUNDGREN A.A., SAUVAGE M., VIGROUX L. and EHLE M.

Abstract (from CDS):

We present a detailed mid-infrared study of the nearby, face-on spiral galaxy M83 based on ISOCAM data. M83 is a unique case study, since a wide variety of MIR broad-band filters as well as spectra, covering the wavelength range of 4 to 18µm, were observed and are presented here. Emission maxima trace the nuclear and bulge area, star-formation regions at the end of the bar, as well as the inner spiral arms. The fainter outer spiral arms and interarm regions are also evident in the MIR map. Spectral imaging of the central 3'x3' (4kpcx4kpc) field allows us to investigate five regions of different environments. The various MIR components (very small grains, polycyclic aromatic hydrocarbon (PAH) molecules, ionic lines) are analyzed for different regions throughout the galaxy. In the total λ4µm to 18µm wavelength range, the PAHs dominate the luminosity, contributing between 60% in the nuclear and bulge regions and 90% in the less active, interarm regions. Throughout the galaxy, the underlying continuum emission from the small grains is always a smaller contribution in the total MIR wavelength regime, peaking in the nuclear and bulge components. The implications of using broad-band filters only to characterize the mid-infrared emission of galaxies, a commonly used ISOCAM observation mode, are discussed. We present the first quantitative analysis of new Hα and λ6cm VLA+Effelsberg radio continuum maps of M83. The distribution of the MIR emission is compared with that of the CO, HI, R band, Hα and λ6cm radio. A striking correlation is found between the intensities in the two mid-infrared filter bands and the λ6cm radio continuum. To explain the tight mid-infrared-radio correlation we propose the anchoring of magnetic field lines in the photoionized shells of gas clouds.

Abstract Copyright:

Journal keyword(s): galaxies: individual: M83 - galaxies: spiral - galaxies: ISM - ISM: dust, extinction - ISM: magnetic fields

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2837 2
2 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 3951 2
3 NGC 1097 LIN 02 46 19.059 -30 16 29.68 10.46 9.97 9.48 8.72 9.8 ~ 1139 3
4 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5181 6
5 NAME HYA-CEN SUPERCL SCG 13 14 -33.3           ~ 125 0
6 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2138 2
7 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2164 2

    Equat.    Gal    SGal    Ecl

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2019.07.18-16:10:33

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