Results 31 to 40 of about 335 (139)
The Astrophysical JournalUnderstanding the circumgalactic medium (CGM) distribution of galaxies is the key to revealing the dynamical exchange of materials between galaxies and their surroundings.
Zeyu Chen +12 more
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A Classification Scheme for Quasar Absorption Lines
The Astrophysical JournalWe present a method to classify intergalactic absorption lines and apply it to 10,772 low-redshift systems. The classification gives the number of components (reflecting the kinematics) in four different ionization phases, using detections and ...
Benjamin E. Rosenwasser +2 more
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Long Dark Gaps in the Lyβ Forest at z < 6: Evidence of Ultra-late Reionization from XQR-30 Spectra
The Astrophysical Journal, 2022 We present a new investigation of the intergalactic medium near reionization using dark gaps in the Ly β forest. With its lower optical depth, Ly β offers a potentially more sensitive probe to any remaining neutral gas compared to the commonly used Ly α ...
Yongda Zhu +24 more
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H I 21 cm Absorption Associated with Foreground Galaxies on Top of Quasars
The Astrophysical JournalA systematic search for H i 21 cm absorption in quasar–galaxy pairs (QGPs) provides a powerful means to map the distribution of cold gas around high-redshift star-forming galaxies.
Labanya K. Guha +2 more
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The Astrophysical JournalWe present a systematic study of the multiphase circumgalactic medium (CGM) around galaxies and quasars, traced by Ca ii λλ 3934, 3969, Mg ii λλ 2796, 2803, and C iv λλ 1548, 1550, using the Year 1 dataset from the Dark Energy Spectroscopic Instrument ...
Weiwen Kong +9 more
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Galactic-scale Emission-line Outflow from the Radio-loud Quasar 3C 191
The Astrophysical Journal Supplement SeriesQuasar feedback is routinely invoked as an indispensable ingredient in galaxy formation models. Galactic outflows are a crucial agent of quasar feedback that frequently manifest themselves in absorption and emission lines.
Qinyuan Zhao +8 more
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Deep Learning Voigt Profiles. I. Single-Cloud Doublets
The Astronomical JournalVoigt profile (VP) decomposition of quasar absorption lines is key to studying intergalactic gas and the baryon cycle governing the formation and evolution of galaxies.
Bryson Stemock +5 more
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The Astrophysical JournalWe analyze the O vi content and kinematics for 126 H i -selected absorbers at 0.14 ≲ z ≲ 0.73 for which the metallicities of their cool photoionized phase have been determined. We separate the absorbers into 100 strong Ly α forest systems (SLFSs with 15 ≲
Sameer +5 more
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The Astrophysical JournalHigh-resolution spectra provide a powerful tool in studying the associated absorption lines in quasars. We present a case study of the quasar J014741-030247 at z ∼ 4.75, which hosts complex intrinsic absorption lines revealed by the high-resolution ...
Huiyang Mao +5 more
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The CIViL* Survey: The Discovery of a C iv Dichotomy in the Circumgalactic Medium of L* Galaxies
The Astrophysical Journal LettersThis paper investigates C iv absorption in the circumgalactic medium (CGM) of L ^⋆ galaxies and its relationship with galaxy star formation rates. We present new observations from the C iv in L ^⋆ galaxies survey (PID # 17076) using the Hubble Space ...
Samantha L. Garza +6 more
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