Journal
ASTRONOMY & ASTROPHYSICS
Volume 406, Issue 2, Pages 493-503Publisher
E D P SCIENCES
DOI: 10.1051/0004-6361:20030615
Keywords
galaxies : halos; galaxies : spiral; galaxies : starburst; galaxies : ISM; galaxies : structure
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In a series of two papers we present results of a new Halpha imaging survey, aiming at the detection of extraplanar diffuse ionized gas in halos of late-type spiral galaxies. We have investigated a sample of 74 nearby edge-on spirals, covering the northern and southern hemisphere. In 30 galaxies we detected extraplanar diffuse emission at mean distances of \z\ similar to 1-2 kpc. Individual filaments can be traced out to \z\ less than or equal to 6 kpc in a few cases. We find a good correlation between the FIR flux ratio (S (60)/S (100)) and the SFR per unit area (L-FIR/D-25(2)), based on the detections/non-detections. This is actually valid for starburst, normal and for quiescent galaxies. A minimal SFR per unit area for the lowest S (60)/S (100) values, at which extended emission has been detected, was derived, which amounts to. (E) over dot (thres)(A25) = (3.2 +/- 0.5) x 10(40) erg s(-1) kpc(-2). There are galaxies where extraplanar emission was detected at smaller values of L-FIR/D-25(2), however, only in combination with a significantly enhanced dust temperature. The results corroborate the general view that the gaseous halos are a direct consequence of SF activity in the underlying galactic disk.
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