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An H-alpha survey aiming at the detection of extraplanar diffuse ionized gas in halos of ed.pdf

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An H-alpha survey aiming at the detection of extraplanar diffuse ionized gas in halos of ed

a r X i v : a s t r o - p h / 0 3 0 4 4 5 2 v 1 2 4 A p r 2 0 0 3 Astronomy Astrophysics manuscript no. (will be inserted by hand later) An Hα survey aiming at the detection of extraplanar diffuse ionized gas in halos of edge–on spiral galaxies ? I. How common are gaseous halos among non–starburst galaxies? J. Rossa ??1,2 and R.–J. Dettmar1 1 Astronomisches Institut, Ruhr–Universita?t Bochum, D–44780 Bochum, Germany e-mail: jrossa@stsci.edu, dettmar@astro.ruhr-uni-bochum.de 2 Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, U.S.A. (present address) Received 28 January 2003 / Accepted 15 April 2003 Abstract. In a series of two papers we present results of a new Hα 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| ～ 1 ? 2 kpc. Individual filaments can be traced out to |z| ≤ 6 kpc in a few cases. We find a good correlation between the FIR flux ratio (S60/S100) and the SFR per unit area (LFIR/D 2 25), 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 S60/S100 values, at which extended emission has been detected, was derived, which amounts to E?thresA25 = (3.2 ± 0.5) × 10 40 erg s?1 kpc?2. There are galaxies where extraplanar emission was detected at smaller values of LFIR/D 2 25, 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. Key words. galaxies: halos – galaxies: spiral – galaxies: starburst – galaxies: ISM – galaxies: structure 1. Introduction In recent years observations revealed the presence of an extraplanar diffus