Lines of sight
نویسندگان
چکیده
منابع مشابه
Two Lines of Sight with Exceedingly Anomalous Uv Interstellar Extinction
Low resolution IUE data obtained towards HD 62542, a B5 V star in a line of sight associated with a dark cloud in the Gum Nebula region near & Pup (OS Iaf) and y Vel (WC8 + 09 I), yields an extinction curve with an extremely broad and weak W extinction bump and the highest far-UV extinction yet obseaved in the Milky Way, reaching a value of E(1200-V)/E(B-v)p115. The weak bump is very similar to...
متن کاملObservations of Rotationally Resolved C3 in Translucent Sight Lines
The rotationally resolved spectrum of the A1 u X 1 g 000–000 transition of C3, centered at 4051.6 Å, has been observed along 10 translucent lines of sight. To interpret these spectra, a new method for the determination of column densities and analysis of excitation profiles involving the simulation and fitting of observed spectra has been developed. The populations of lower rotational levels (J...
متن کاملDust obscuration studies along quasar sight lines using simulated galaxies
We use the results of a set of three–dimensional SPH–Treecode simulations which model the formation and early evolution of disk galaxies, including the generation of heavy elements by star formation, to investigate the effects of dust absorption in quasar absorption line systems. Using a simple prescription for the production of dust, we have compared the column density, zinc abundance and opti...
متن کاملStatistics and characteristics of MgII absorbers along GRB lines of sight observed with VLT-UVES
We analyse the properties of Mg ii absorption systems detected along the sightlines toward GRBs using a sample of 10 GRB afterglow spectra obtained with VLT-UVES over the past six years. The signal-to-noise ratio is sufficiently high that we can extend previous studies to smaller equivalent widths (typically Wr > 0.3 Å). Over a pathlength of ∆z ∼ 14, we detect 9 intervening Mg ii systems with W...
متن کاملFirst Comparison of Ionization and Metallicity in Two Lines of Sight Toward
Using new Hubble Space Telescope Faint Object Spectrograph, New Technology Telescope EMMI, and Keck HIRES spectra of the gravitationally-lensed double QSO HE 1104–1805 AB (zem = 2.31), and assuming UV photoionization by a metagalactic radiation field, we derive physical conditions (ionization levels, metal abundances and cloud sizes along the lines of sight) in five C iv+Mg ii absorption system...
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ژورنال
عنوان ژورنال: Social Identities
سال: 2018
ISSN: 1350-4630,1363-0296
DOI: 10.1080/13504630.2018.1514149