Article
Astronomy & Astrophysics
Alexander Beckettt, Simon L. Morris, Michele Fumagalli, Nicolas Tejos, Buell Jannuzi, Sebastiano Cantalupo
Summary: We use H i absorption to model potential disc and outflow structures in the circumgalactic medium, and find possible outflows and co-rotating structures, suggesting that geometric cuts are not sufficient to distinguish between discs and outflows in single line-of-sight studies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Martin Wendt, Nicolas F. Bouche, Johannes Zabl, Ilane Schroetter, Sowgat Muzahid
Summary: The study investigates the dust content of the circum-galactic medium (CGM) in relation to the position of quasar sightlines with respect to the galaxy major-axis. It finds a positive correlation between the azimuthal angle and [Zn/Fe], indicating that CGM along the minor axis is on average more metal enriched compared to the gas located along the major axis. This anisotropic distribution is consistent with recent results on outflow and accretion in hydro-dynamical simulations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Sowgat Muzahid, Joop Schaye, Sebastiano Cantalupo, Raffaella Anna Marino, Nicolas F. Bouche, Sean Johnson, Michael Maseda, Martin Wendt, Lutz Wisotzki, Johannes Zabl
Summary: The first characterization of the circumgalactic medium of Ly alpha emitters (LAEs) reveals distinct features in terms of luminosity and interstellar material absorption, with no strong dependence of absorption on transverse distance, redshift, or Ly alpha emission line properties. However, a correlation is found between increased absorption near LAEs with higher star formation rates, suggesting a link between surrounding interstellar hydrogen and star formation in LAEs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Pratyush Anshul, Anand Narayanan, Sowgat Muzahid, Alexander Beckett, Simon L. Morris
Summary: This study presents the physical properties, chemical abundances, and transverse sizes of a multiphase medium in a galaxy field at z = 0.399 using HST/COS spectra of the twin quasar lines of sight Q 0107-025A & Q 0107-025B. The absorber towards Q 0107-025B is a partial Lyman limit system (pLLS) while the absorber along the other sightline has a lower HI column density. OVI and broad HI coinciding in both sightlines are best explained through collisional ionization in a cooling plasma with solar metallicity.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Thomas J. Cooper, Gwen C. Rudie, Hsiao-Wen Chen, Sean D. Johnson, Fakhri S. Zahedy, Mandy C. Chen, Erin Boettcher, Gregory L. Walth, Sebastiano Cantalupo, Kathy L. Cooksey, Claude-Andre Faucher-Giguere, Jenny E. Greene, Sebastian Lopez, John S. Mulchaey, Steven Penton, Patrick Petitjean, Mary E. Putman, Marc Rafelski, Michael Rauch, Joop Schaye, Robert A. Simcoe
Summary: This study investigates two partial Lyman limit systems (pLLSs) discovered in the Cosmic Ultraviolet Baryon Survey (CUBS), providing detailed information on the ionization analysis of multiphase gas in diverse galaxy environments. The data reveal kinematically aligned gas components with varying chemical abundances and densities, stressing the importance of considering the heterogeneous nature of circumgalactic gas in theoretical models. Additionally, survey data point to these systems being located near star-forming galaxies, highlighting the significance of studying the gas surrounding galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Zhijie Qu, Hsiao-Wen Chen, Gwen C. Rudie, Fakhri S. Zahedy, Sean D. Johnson, Erin Boettcher, Sebastiano Cantalupo, Mandy C. Chen, Kathy L. Cooksey, David DePalma, Claude-Andre Faucher-Giguere, Michael Rauch, Joop Schaye, Robert A. Simcoe
Summary: This paper presents a systematic study of the photoionization and thermodynamic properties of the cool circumgalactic medium (CGM) around galaxies at redshift z less than or similar to 1, providing important insights into the gas density, temperature, and pressure of individual absorbing components and their non-thermal motions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Johannes Zabl, Nicolas F. Bouche, Lutz Wisotzki, Joop Schaye, Floriane Leclercq, Thibault Garel, Martin Wendt, Ilane Schroetter, Sowgat Muzahid, Sebastiano Cantalupo, Thierry Contini, Roland Bacon, Jarle Brinchmann, Johan Richard
Summary: The study reports the first detection of extended Mg II emission from a galaxy's halo probed by a quasar sightline, along with observations of Mg II absorption, and compares the kinematics of both emission and absorption. The research suggests that shocks may be a more viable source to power the extended Mg II emission.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Marie Wingyee Lau, Fred Hamann, Jarred Gillette, Serena Perrotta, David S. N. Rupke, Dominika Wylezalek, Nadia L. Zakamska
Summary: A population of luminous, extremely red quasars has been discovered with extreme spectral properties related to powerful quasar-driven outflows. The inner halo of these quasars is dominated by moderate-speed outflow, while the outer halo is dominated by inflow. These extremely red quasars have unique physical conditions compared to other quasar populations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Hiroyuki Hirashita, Ting-Wen Lan
Summary: Observations of reddening in the circum-galactic medium suggest a significant presence of small grains, possibly produced through the shattering of pre-existing large grains. Physical conditions in cool clumps are favorable for small-grain production, explaining the observed reddening phenomenon.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Conor Wildy, Hermine Landt, Martin J. Ward, Bozena Czerny, Daniel Kynoch
Summary: The study found a massive obscuration event at the nucleus of the active galaxy NGC 5548, supporting the existence of warm absorber (WA) and obscurer. The experiment also indicates the impact of helium recombination on the physics of WA gas, but suggests that the reality might be more complex.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Ming-Feng Ho, Simeon Bird, Roman Garnett
Summary: This study introduces a new catalogue of DLAs, estimates their statistical properties using Gaussian process models, and demonstrates unbiased probabilistic predictions of DLA population statistics even with noisy data. The results are consistent with previous measurements and the new model is shown to be able to measure DLA population statistics even in the Lyman-beta forest region.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Alexander Beckett, Simon L. Morris, Michele Fumagalli, Nicolas Tejos, Buell Jannuzi, Sebastiano Cantalupo
Summary: We test simple disc and outflow models against the observations of H i gas within a few virial radii of galaxies in pairs and groups. Our models can reproduce approximately 75% of the identified absorption components within 500 km/s of a group galaxy, suggesting that most of the H i around groups is consistent with the circumgalactic medium (CGM) of individual galaxies. Gas stripped in interactions between galaxies may explain some of the remaining absorption, but further evidence is needed. H i column densities and detections of O vi are higher around groups compared to isolated galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Daniel Kynoch, Hermine Landt, Maryam Dehghanian, Martin J. Ward, Gary J. Ferland
Summary: This study presents the first detailed investigation into the variability of the near-infrared coronal lines in AGN. It is found that the coronal lines in AGN are generally broader and blueshifted compared to low-ionization forbidden lines. The variability primarily occurs in the broad wings of the coronal line profiles, while the cores show negligible changes. This suggests the presence of at least two coronal line regions in AGN.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Ilane Schroetter, Nicolas F. Bouche, Johannes Zabl, Hadi Rahmani, Martin Wendt, Sowgat Muzahid, Thierry Contini, Joop Schaye, Kasper B. Schmidt, Lutz Wisotzki
Summary: Using the MEGAFLOW survey data, CIV and MgII covering fractions with respect to impact parameter b and redshift evolution were measured. Results show an opposite trend in the covering fractions of CIV and MgII with time, and a lack of [OII] counterparts in cases with only Civ absorption systems.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Ying Zu
Summary: Studying the kinematics of Mg II absorbers is crucial for understanding the origin of cool, metal-enriched gas clouds around massive quiescent galaxies. A novel method has been developed to infer the cool cloud kinematics from the redshift-space galaxy-cloud cross-correlation, allowing for comparisons between different cloud kinematic models and observational data. Among the four types of cloud kinematics considered, only the tired wind model was able to replicate the observed truncation effect, suggesting the propagation of ancient wind bubbles.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)