Fine-structure diagnostics of neutral carbon toward HE 0515-4414
نویسندگان
چکیده
منابع مشابه
Fine - structure diagnostics of neutral carbon toward HE 0515 - 4414
New high-resolution high signal-to-noise spectra of the z = 1.15 damped Lyman α (DLA) system toward the quasi-stellar object HE 0515-4414 reveal absorption lines of the multiplets 2 and 3 in C i. The resonance lines are seen in two components with total column densities of logN = 13.79 ± 0.01 and logN = 13.36 ± 0.01, respectively. The comparision of theoretical calculations of the relative fine...
متن کاملDetection of molecular hydrogen at z = 1 . 15 toward HE 0515 – 4414 ⋆
A new molecular hydrogen cloud is found in the sub-damped Lyα absorber [logN(H i) = 19.88± 0.05] at the redshift zabs = 1.15 toward the bright quasar HE 0515–4414 (zem = 1.71). More than 30 absorption features in the Lyman band system of H2 are identified in the UV spectrum of this quasar obtained with the Space Telescope Imaging Spectrograph (STIS) aboard the Hubble Space Telescope. The H2-bea...
متن کاملPhotoionized O vi absorbers toward the bright QSO HE 0515 – 4414 ⋆
We report on detailed Monte Carlo inversion analysis of five Ovi systems from the spectrum of the bright quasar HE 0515–4414 (zem = 1.71). The associated system at zabs = 1.697 with the neutral hydrogen column density N(H i) = 4.4×10 cm shows pronounced absorption from highly ionized transitions of C iii, C iv, Nv, Ovi, Si iv, and probably Svi. We found that only a power law type ionizing spect...
متن کاملKey words: Quasars: absorption lines – Quasars: individual: HE 1122−1649, HE 0515−4414 Galaxies: abundances – Galaxies: evolution – Galaxies: ISM – Cosmology: observations
Detailed analysis of the spectral lines from two low redshift damped Lyman alpha absorbers (DLA) confirms that they are a heterogeneous population. Both systems have low metal abundances of approximately 0.05 to 0.1 solar. The abundance pattern of the DLA at z = 1.15 towards HE 0515-4414 shows dust depletion comparable to that found in our Galaxy, while the system at z = 0.68 towards HE 1122-16...
متن کاملFar-infrared Fine-structure Line Diagnostics of Ultraluminous Infrared Galaxies
We present Herschel observations of six fine-structure lines in 25 Ultraluminous Infrared Galaxies at z < 0.27. The lines, [O III]52μm, [N III]57μm, [O I]63μm, [N II]122μm, [O I]145μm, and [C II]158μm, are mostly single gaussians with widths <600 km s and luminosities of 10 − 10L⊙. There are deficits in the [O I]63/LIR, [N II]/LIR, [O I]145/LIR, and [C II]/LIR ratios compared to lower luminosit...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2002
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20020342