Broad absorption line disappearance and emergence using multiple-epoch spectroscopy from the Sloan Digital Sky Survey
Sign Up to like & getrecommendations! Published in 2017 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stx1063
Abstract: We investigate broad absorption line (BAL) disappearance and emergence using a 470 BAL-quasar sample over 1x10^-7 pc (0.02 au) using the ionization-change scenario, and constrain a nominal outflow location of < 0.5 pc and a… read more here.
Keywords: absorption line; emergence using; broad absorption; disappearance emergence ... See more keywords
Quasars with P v broad absorption in BOSS data release 9
Sign Up to like & getrecommendations! Published in 2017 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stx870
Abstract: Broad absorption lines (BALs) found in a significant fraction of quasar spectra identify highâvelocity outflows that might be present in all quasars and could be a major factor in feedback to galaxy evolution. Understanding the… read more here.
Keywords: absorption; column densities; broad absorption; bal quasars ... See more keywords
Redshifted broad absorption line quasars found via machine-learned spectral similarity
Sign Up to like & getrecommendations! Published in 2018 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/sty2127
Abstract: We report the discovery of 31 new redshifted broad absorption line quasars (RSBALs) from the Sloan Digital Sky Survey (SDSS). The number of previously known such objects is 19. The identification of the new objects… read more here.
Keywords: absorption line; broad absorption; redshifted broad; line quasars ... See more keywords
On the structure and energetics of quasar broad absorption-line outflows
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DOI: 10.1093/mnras/sty2900
Abstract: Quasar accretion-disk outflows might play an important role in galaxy evolution, but they are notoriously difficult to study due to line saturation and blending problems in the Ly-alpha forest. We circumvent these problems by constructing… read more here.
Keywords: structure energetics; line; energetics quasar; quasar broad ... See more keywords
Two broad absorption bands in infrared atmosphere transparent windows by trapezoid multilayered grating
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DOI: 10.1364/ome.383383
Abstract: We proposed a metamaterial absorber composed of an array of trapezoid multilayered grating Au and InP on top of an opaque substrate, which covers two atmosphere-transparent-window bands with appropriate modulation of geometric parameters. The absorption… read more here.
Keywords: two broad; multilayered grating; broad absorption; atmosphere transparent ... See more keywords
C IV Broad Absorption Line Variability in QSO Spectra from SDSS Surveys
Sign Up to like & getrecommendations! Published in 2017 at "Frontiers in Astronomy and Space Sciences"
DOI: 10.3389/fspas.2017.00064
Abstract: Broad absorption lines (BALs) in the spectra of quasi-stellar objects (QSOs) are thought to arise from outflowing winds along our line of sight; winds, in turn, are thought to originate from the accretion disk, in… read more here.
Keywords: absorption line; line; variability; broad absorption ... See more keywords