The Diffuse Ionized Gas Perpendicular to the Plane of NGC 891
نویسندگان
چکیده
منابع مشابه
Integral Field Unit Observations of NGC 891: Kinematics of the Diffuse Ionized Gas Halo
We present high and moderate spectral resolution spectroscopy of diffuse ionized gas (DIG) emission in the halo of NGC 891. The data were obtained with the SparsePak integral field unit at the WIYN Observatory. The wavelength coverage includes the [N II]λλ 6548, 6583, Hα, and [S II]λλ 6716, 6731 emission lines. Position-velocity (PV) diagrams, constructed using spectra extracted from four Spars...
متن کاملSparsepak Observations of Diffuse Ionized Gas Halo Kinematics in Ngc 891
We present WIYN SparsePak observations of the diffuse ionized gas (DIG) halo of NGC 891. Preliminary results of an analysis of the halo velocity field reveal a clear gradient of the azimuthal velocity with z which agrees with results for the neutral gas. The magnitude of the gradient has been determined, using two independent methods, to be approximately 15 km s kpc. 1. Observations and Data Re...
متن کاملKinematics of diffuse ionized gas in the disk halo interface of NGC 891 from Fabry-Pérot observations
Context. The properties of the gas in halos of galaxies constrain global models of the interstellar medium. Kinematical information is of particular interest since it is a clue to the origin of the gas. Aims. Here we report observations of the kinematics of the thick layer of the diffuse ionized gas in NGC 891 in order to determine the rotation curve of the halo gas. Methods. We have obtained a...
متن کاملFurther Spectroscopy of the Diffuse Ionized Gas in NGC 891 and Evidence for a Secondary Source of Ionization
Two long-slit spectra of the diffuse ionized gas in NGC 891 are presented. The first reveals variations parallel to the major axis in emission line ratios in the halo gas at z = 700 pc. It is found that filaments of Hα emission show lower values of [N II]/Hα, [S II]/Hα and [O I]/Hα. Although this result is expected if the filaments represent the walls of evacuated chimneys, it merely reflects a...
متن کاملLong 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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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1991
ISSN: 0074-1809
DOI: 10.1017/s0074180900089191