Optical Spectroscopy of Diffuse Ionized Gas in M31
نویسندگان
چکیده
منابع مشابه
Long slit spectroscopy of diffuse ionized gas in NGC 55 ⋆
Spectroscopic measurements of emission line ratios and velocities are presented for ionized gas across the central plane of NGC 55, a late-type galaxy in the Sculptor group. The low metallicity in NGC 55 leads to relatively low line ratios of [S ii]/Hα and [N ii]/Hα for H ii regions as well as the diffuse ionized gas. These are the first spectroscopical measurements of line ratios in ionized ga...
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We present results of KPNO 4-m optical spectroscopy of discrete emissionline nebulae and regions of diffuse ionized gas (DIG) in M31. Long-slit spectra of 16 positions in the NE half of M31 were obtained over a 5-15 kpc range in radial distance from the center of the galaxy with special attention to the annulus of high star formation between 8 and 12 kpc. Slit positions were chosen such that se...
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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...
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متن کاملOptical Spectroscopy of Highly Ionized Neon
The recent development of sources such as the recoil ion source fl], producing highly charged, low energy (HQLE) ions presents the possibility of bringing highresolution Iascr spectroscopy to the study of highty tharged ions. A prerequisite For performing these measurements is the preparation of the HQLE ions quantum states which participate in transitions accessible to tunable lasers. For this...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1997
ISSN: 0004-637X,1538-4357
DOI: 10.1086/304285