نتایج جستجو برای: ionized gas
تعداد نتایج: 251546 فیلتر نتایج به سال:
Abundance differences between the neutral and the ionized gas of the dwarf galaxy IZw 36 Abstract. We present a FUSE spectroscopic study of the nearby gas–rich, metal–deficient blue compact dwarf (BCD) galaxy IZw 36. Atomic hydrogen and many metal lines are observed in absorption against the stellar continuum of young, massive stars embedded in the ionized region. Profile fitting of absorption ...
The Wisconsin H-Alpha Mapper (WHAM) Northern Sky Survey is revealing that many intermediate-velocity (|v LSR | ≤ 100 km s −1) neutral clouds and complexes have an associated ionized component. We present the first map of the Hα emission from an intermediate-or high-velocity structure: Complex K. This large, high-latitude feature stretches from ℓ ≈ 10 • to 70 • , b ≈ +30 • to +70 • and peaks in ...
A map of the core of OrionA, with a 42′′ resolution in the 64α recombination line of hydrogen, covering ∼5′ by ∼5′, is presented. The Vlsr distribution shows a complex variation about the center of the ionized gas emission: From ∆α=-200′′ to +300′′, the Vlsr varies from -5km s−1 to +2km s−1 then to -4km s−1, finally rising to +3km s−1. A search for cold (Te ∼3000K) ionized gas toward the KL neb...
We present V and I continuum images and H +[N ii] maps of nine early-type galaxies observed with the Wide Field Channel of the Advanced Camera for Surveys on the Hubble Space Telescope. Dust and ionized gas are detected in all galaxies. The optical nebulae are primarily concentrated on the nuclei and extend out to radii of a few hundred parsecs in compact clumps, filaments, or disks. Two galaxi...
We present interstellar absorption line measurements of the ions S III and Al III towards the stars β Sco, μ Col, ξ Per, ζ Oph, ρ Leo, and HD 18100 using archival data from the Goddard High Resolution Spectrograph on board the Hubble Space Telescope. The ions Al III and S III trace heavily depleted and non-depleted elements, respectively, in ionized gas along the sightlines to these late-O/earl...
This review gives a brief introduction to the physics and the structure of active galactic nuclei (AGN). The main topics that are being discussed are general accretion, the structure and the spectrum of various types of accretion disks, photoionization and recombination, energy balance and gas temperature, the spectrum of ionized gas including the effect of dust, and the dynamics of ionized gas...
We present radio continuum observations of the spiral-shaped ionized feature (Sgr A West) within the inner pc of the Galactic center at three epochs spanning 1986 to 1995. The VLA A-configuration was used at λ2cm (resolution of 0. ′′ 1×0. ′′ 2). We detect proper motions of a number of features in the Northern and Eastern Arms of Sgr A West including the ionized gas associated with IRS 13 with V...
We report on a detailed morphological and kinematic study of the isolated non-barred nearby Seyfert 2 galaxy NGC 2110. We combine Integral Field optical spectroscopy, with long-slit and WFPC2 imaging available in the HST archive to investigate the fueling mechanism in this galaxy. Previous work (Wilson & Baldwin 1985) concluded that the kinematic center of the galaxy is displaced ∼ 220 pc from ...
We present two ROSAT PSPC observations of the radio-loud, lobe-dominated quasar 3C 351, which shows an ‘ionized absorber’ in its X-ray spectrum. The factor 1.7 change in flux in the ∼2 years between the observations allows a test of models for this ionized absorber. The absorption feature at ∼ 0.7 keV (quasar frame) is present in both spectra but with a lower optical depth when the source inten...
Supermassive black holes in the nuclei of active galaxies expel large amounts of matter through powerful winds of ionized gas. The archetypal active galaxy NGC 5548 has been studied for decades, and high-resolution x-ray and ultraviolet (UV) observations have previously shown a persistent ionized outflow. An observing campaign in 2013 with six space observatories shows the nucleus to be obscure...
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