NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-24 T03:11:57 PDT
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For refcode 2003A&A...406..493R:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2003A&A...406..493R An H(alpha} 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? Rossa, J.; Dettmar, R.-J. Abstract. 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| ~ 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 (S_60_/S_100_) and the SFR per unit area (L_FIR_/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 S_60_/S_100_ values, at which extended emission has been detected, was derived, which amounts to dot E_A_25^thres^ = (3.2+/-0.5)*E^40^erg s^-1^ kpc^-2^. There are galaxies where extraplanar emission was detected at smaller values of L_FIR_/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. Keywords: galaxies: halos, galaxies: spiral, galaxies: starburst, galaxies: ISM, galaxies: structure
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