The changing circumgalactic medium over the last 10 Gyr – I. Physical and dynamical properties

Huscher, Ezra L.; Oppenheimer, Benjamin D.; Lonardi, Alice; Crain, Robert A.; Richings, Alexander J.; Schaye, Joop

doi:10.1093/mnras/staa3203

Cited by 17 publications

(10 citation statements)

References 83 publications

(110 reference statements)

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“…(iv) The line-of-sight velocities of H absorption found near the major axis of a galaxy show a significant tendency to align with the galaxy rotation, suggesting a strong coupling between the angular momentum of the CGM and galaxy (as found by e.g. DeFelippis et al 2020;Huscher et al 2021).…”

Section: Discussionmentioning

confidence: 86%

“…We attempt to determine whether the major-axis population discussed above is indeed the same co-rotating material identified in Mg (e.g Zabl et al 2019), as well as found in simulations (e.g Huscher et al 2021;DeFelippis et al 2020). We compare the velocity offsets between galaxies and H absorbers found near to their major axes with the stellar rotation of the galaxies determined from emission lines in the MUSE data.…”

Section: Kinematicsmentioning

confidence: 84%

“…DeFelippis et al (2020) find, in Illustris TNG simulations, that this major-axis corotating material often extends in a much thicker 'wedge' out to ∼ 0.75 𝑅 vir for sub-𝐿 ★ galaxies. However, Huscher et al (2021) use the EAGLE simulations and study larger ≈ 𝐿 ★ galaxies, finding substantial rotation only to ≈ 0.3𝑅 vir in cool gas at 𝑧 = 0. Any attempts to constrain the extent of this material through observations will require detections of absorption with impact parameters of 100-300 kpc from isolated galaxies, which our sample lacks.…”

Section: Kinematicsmentioning

confidence: 99%

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The relationship between gas and galaxies at z<1 using the Q0107 quasar triplet

Beckett,

Morris,

Fumagalli

et al. 2021

Preprint

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We study the distribution and dynamics of the circum-and intergalactic medium using a dense galaxy survey covering the field around the Q0107 system, a unique z ≈ 1 projected quasar triplet. With full Ly𝛼 coverage along all three lines-of-sight from z=0.18 to z=0.73, more than 1200 galaxy spectra, and two MUSE fields, we examine the structure of the gas around galaxies on 100-1000 kpc scales. We search for H absorption systems occurring at the same redshift (within 500 km s −1 ) in multiple sightlines, finding with > 99.9% significance that these systems are more frequent in the observed quasar spectra than in a randomly distributed population of absorbers. This is driven primarily by absorption with column densities N(H ) > 10 14 cm −2 , whilst multi-sightline absorbers with lower column densities are consistent with a random distribution. Star-forming galaxies are more likely to be associated with multisightline absorption than quiescent galaxies. HST imaging provides inclinations and position angles for a subset of these galaxies. We observe a bimodality in the position angle of detected galaxy-absorber pairs, again driven mostly by high-column-density absorbers, with absorption preferentially along the major and minor axes of galaxies out to impact parameters of several hundred kpc. We find some evidence supporting a disk/outflow dichotomy, as H absorbers near the projected major-axis of a galaxy show line-of-sight velocities that tend to align with the rotation of that galaxy, whilst minor-axis absorbers are twice as likely to exhibit O at the same redshift.

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Section: Discussionmentioning

confidence: 86%

Section: Kinematicsmentioning

confidence: 84%

Section: Kinematicsmentioning

confidence: 99%

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The relationship between gas and galaxies at z<1 using the Q0107 quasar triplet

Beckett,

Morris,

Fumagalli

et al. 2021

Preprint

Self Cite

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“…Rich and complex kinematic structures of circumgalactic gas around galaxies have already been seen in cosmological simulations (Nelson et al 2013;Ford et al 2014;Anglés-Alcázar et al 2017;Oppenheimer 2018;Hafen et al 2019;Nelson et al 2020), such as extended, warped and thick disks due to cosmological gas accretion (Stewart et al 2011b(Stewart et al , 2013, gas associated with accreting satellites (Shao et al 2018) and stream accretion from the cosmic web (Dekel et al 2009;Danovich et al 2015) etc. In particular, high-angularmomentum co-rotating (with respect to stellar disks) circumgalactic gas associated with simulated galaxies is found to extend to ∼ 100 kpc (El-Badry et al 2018;Ho et al 2020;Huscher et al 2021;DeFelippis et al 2021).…”

Section: Introductionmentioning

confidence: 89%

From large-scale environment to CGM angular momentum to star forming activities -- I: star-forming galaxies

Wang,

Xu,

et al. 2021

Preprint

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The connection between halo gas acquisition through the circumgalactic medium (CGM) and galaxy star formation has long been studied. In this series of two papers, we put this interplay within the context of the galaxy environment on large scales (several hundreds of kpc), which, to a certain degree, maps out various paths for galaxy interactions. We use the IllustrisTNG-100 simulation to demonstrate that the large-scale environment modulates the circumgalactic gas angular momentum, resulting in either enhanced (Paper I) or suppressed (Paper II) star formation inside a galaxy. In this paper (Paper I), we show that the large-scale environment around a star-forming galaxy is often responsible for triggering new episodes of star formation. Such an episodic star formation pattern is well synced with a pulsating motion of the circumgalactic gas, which, on the one hand receives angular momentum modulations from the large-scale environment, yielding in-spiralling gas to fuel the star-forming reservoir, while, on the other hand, is affected by the feedback activities from the galaxy centre. As a result, a present-day star-forming galaxy may have gone through several cycles of star-forming and quiescent phases during its evolutionary history, with the circumgalactic gas carrying out a synchronized cadence of "breathing in and out" motions out to ∼ 100 kpc.

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“…The gradient is of an order two times the estimated one-dimensional velocity dispersion of the dark matter halo. Rotating disc of ∼100 kpc size is not expected to be in place by 𝑧 ∼ 2 (e.g., DeFelippis et al 2020;Huscher et al 2021). Together with the filamentary morphology, the northern and southern edges are most consistent with tracing inflowing streams.…”

Section: Spatially Resolved Kinematicsmentioning

confidence: 99%

Probing the Inner Circumgalactic Medium and Quasar Illumination around the Reddest `Extremely Red Quasar' (ERQ)

Lau,

Hamann,

Gillette

et al. 2022

Preprint

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Dusty quasars might be in a young stage of galaxy evolution with prominent quasar feedback. We study a population of luminous, extremely red quasars at redshifts 𝑧 ∼ 2-4 that has a suite of extreme spectral properties that may all be related to exceptionally powerful quasar-driven outflows. We present Keck/KCWI observations of the reddest known ERQ, at 𝑧 = 2.3184, with an extremely fast [O ] 𝜆5007 outflow at ∼6000 km s −1 . The Ly𝛼 halo spans ∼100 kpc. The halo is kinematically quiet, with velocity dispersion ∼300 km s −1 and no broadening above the dark matter circular velocity down to the spatial resolution ∼6 kpc from the quasar. We detect spatially-resolved He 𝜆1640 and C 𝜆1549 emissions with kinematics similar to the Ly𝛼 halo and a narrow component in the [O ] 𝜆5007. Quasar reddening acts as a coronagraph allowing views of the innermost halo. A narrow Ly𝛼 spike in the quasar spectrum is inner halo emission, confirming the broad C 𝜆1549 in the unresolved quasar is blueshifted by 2242 km s −1 relative to the halo frame. We propose the inner halo is dominated by past/moderate-speed outflow and the outer halo dominated by inflow. The high central concentration of the surface brightness and the circularly symmetric morphology of the inner halo are consistent with the ERQ being young. The He 𝜆1640/Ly𝛼 ratio of the inner halo and the asymmetry level of the overall halo are dissimilar to Type II quasars, implying central ionizing photons can escape along the line of sight. While quasar dominates the ionization, we find no evidence of mechanical quasar feedback on circumgalactic scales.

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The changing circumgalactic medium over the last 10 Gyr – I. Physical and dynamical properties

Cited by 17 publications

References 83 publications

The relationship between gas and galaxies at z<1 using the Q0107 quasar triplet

The relationship between gas and galaxies at z<1 using the Q0107 quasar triplet

From large-scale environment to CGM angular momentum to star forming activities -- I: star-forming galaxies

Probing the Inner Circumgalactic Medium and Quasar Illumination around the Reddest `Extremely Red Quasar' (ERQ)

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