منابع مشابه
Spectroscopy of diffuse ionized gas in halos of selected edge - on galaxies ?
In order to examine the excitation and ionization mechanism of extraplanar diffuse ionized gas (DIG) we have obtained optical longslit spectra of seven edge-on spiral galaxies. In four objects the brightest emission lines can be traced out to distances of typically 1.5 kpc above the disk. For NGC 1963 and NGC 3044 line ratios such as [N ii] λ6583/Hα or [S ii] λ6717/Hα as well as [O iii] λ5007/H...
متن کاملExtraplanar diffuse ionized gas in a small sample of nearby edge-on galaxies
We present narrowband Hα imaging data of a small survey of nearby edge-on spiral galaxies, aiming at the detection of ‘extraplanar’ diffuse ionized gas (DIG). A few of our studied edge–on spirals show signs of disk–halo interaction (DHI), where extended line emission far above the galactic plane of these galaxies is detected. In some cases an extraplanar diffuse ionized gas (eDIG) layer is disc...
متن کاملIonization Sources and Physical Conditions in the Diffuse Ionized Gas Halos of Four Edge-On Galaxies
Deep long-slit spectra of the diffuse ionized gas halos of the edge-on spiral galaxies NGC 4302 and UGC 10288 are presented. Emission lines are detected up to about z = 2 kpc in NGC 4302, and to nearly z = 3 kpc on the north side of UGC 10288. For both galaxies, the line ratios [N II]/Hα and [S II]/Hα increase with z in accordance with dilute photo-ionization models. Runs of [S II]/[N II], and ...
متن کاملEmission Line Ratios and Variations in Temperature and Ionization State in the Diffuse Ionized Gas of Five Edge–on Galaxies
We present spectroscopic observations of ionized gas in the disk–halo regions of five edge–on galaxies, covering a wavelength range from [O II] λ3727Å to [S II] λ6716.4Å. The inclusion of the [O II] emission provides additional constraints on the properties of the diffuse ionized gas (DIG), in particular, the origin of the observed spatial variations in the line intensity ratios. We have derive...
متن کاملLocalized magnetic reconnection as a cause of extraplanar diffuse ionised gas in the galactic halo
Many observations indicate the occurrence of ionised gas in the distant halos of galaxies (including our own). Since photoionisation by stars (mainly O stars, young or evolved low-mass stars depending on the kind of galaxy) does not seem to be exclusively responsible for the ionisation of the hydrogen filaments that should otherwise cool fast and recombine quickly, the question arises which ext...
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of Australia
سال: 1998
ISSN: 1323-3580,1448-6083
DOI: 10.1071/as98106