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13 results on '"Zahedy, F"'

1. MALS discovery of a rare HI 21-cm absorber at $z\sim1.35$: origin of the absorbing gas in powerful AGN

Author

Deka, P. P., Gupta, N., Chen, H. W., Johnson, S. D., Noterdaeme, P., Combes, F., Boettcher, E., Balashev, S. A., Emig, K. L., Józsa, G. I. G., Klöckner, H. -R., Krogager, J-. K., Momjian, E., Petitjean, P., Rudie, G. C., Wagenveld, J., and Zahedy, F. S.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

We report a new, rare detection of HI 21-cm absorption associated with a quasar (only six known at $15$ GHz). The simplest explanation would be that no large HI column (N(HI)$>10^{17}$ cm$^{-2}$) is present towards the radio `core' and the optical AGN. Based on the joint optical and radio analysis of a heterogeneous sample of 16 quasars ($z_{median}$ = 0.7) and 15 radio galaxies ($z_{median}$ = 0.3) with HI 21-cm absorption detection and matched in 1.4 GHz luminosity (L$_{\rm 1.4\,GHz}$), a consistent picture emerges where quasars are primarily tracing the gas in the inner circumnuclear disk and cocoon created by the jet-ISM interaction. These exhibit L$_{1.4\,\rm GHz}$ - $\Delta V_{\rm null}$ correlation, and frequent mismatch between the radio and optical spectral lines. The radio galaxies show no such correlation and likely trace the gas from the cocoon and the galaxy-wide ISM outside the photoionization cone. The analysis presented here demonstrates the potential of radio spectroscopic observations to reveal the origin of the absorbing gas associated with AGN that may be missed in optical observations., Comment: 10 pages, 8 figures, accepted for publication in A&A

Published
2023

2. Circumgalactic Gas and the Precipitation Limit

Author

Voit, G. M., Babul, A., Babyk, Iu., Bryan, G. L., Chen, H. -W., Donahue, M., Fielding, D., Gaspari, M., Li, Y., McDonald, M., O'Shea, B. W., Prasad, D., Sharma, P., Sun, M., Tremblay, G., Werk, J., Werner, N., and Zahedy, F.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

During the last decade, numerous and varied observations, along with increasingly sophisticated numerical simulations, have awakened astronomers to the central role the circumgalactic medium (CGM) plays in regulating galaxy evolution. It contains the majority of the baryonic matter associated with a galaxy, along with most of the metals, and must continually replenish the star forming gas in galaxies that continue to sustain star formation. And while the CGM is complex, containing gas ranging over orders of magnitude in temperature and density, a simple emergent property may be governing its structure and role. Observations increasingly suggest that the ambient CGM pressure cannot exceed the limit at which cold clouds start to condense out and precipitate toward the center of the potential well. If feedback fueled by those clouds then heats the CGM and causes it to expand, the pressure will drop and the "rain" will diminish. Such a feedback loop tends to suspend the CGM at the threshold pressure for precipitation. The coming decade will offer many opportunities to test this potentially fundamental principle of galaxy evolution., Comment: Astro2020 White Paper, 8 pages, 2 figures (differences from Astro2020 version: some typos fixed, some references added)

Published
2019

3. Circumgalactic Pressure Profiles Indicate Precipitation-Limited Atmospheres for $M_* \sim 10^9$$-$$10^{11.5}\,M_\odot$

Author

Voit, G. M., Donahue, M., Zahedy, F., Chen, H. -W., Werk, J., Bryan, G. L., and O'Shea, B. W.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

Cosmic gas cycles in and out of galaxies, but outside of galaxies it is difficult to observe except for the absorption lines that circumgalactic clouds leave in the spectra of background quasars. Using photoionization modeling of those lines to determine cloud pressures, we find that galaxies are surrounded by extended atmospheres that confine the clouds and have a radial pressure profile that depends on galaxy mass. Motivated by observations of the universe's most massive galaxies, we compare those pressure measurements with models predicting the critical pressure at which cooler clouds start to precipitate out of the hot atmosphere and rain toward the center. We find excellent agreement, implying that the precipitation limit applies to galaxies over a wide mass range., Comment: Accepted to ApJ Letters (8 pages, 4 figures)

Published
2019
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4. An Ensemble Study of Turbulence in Extended QSO Nebulae at z ≈ 0.5-1

Author

Chen, M, Chen, H, Rauch, M, Qu, Z, Johnson, S, Schaye, J, Rudie, G, Li, J, Liu, Z, Zahedy, F, Cantalupo, S, Boettcher, E, Chen M. C., Chen H. -W., Rauch M., Qu Z., Johnson S. D., Schaye J., Rudie G. C., Li J. I., Liu Z., Zahedy F. S., Cantalupo S., Boettcher E., Chen, M, Chen, H, Rauch, M, Qu, Z, Johnson, S, Schaye, J, Rudie, G, Li, J, Liu, Z, Zahedy, F, Cantalupo, S, Boettcher, E, Chen M. C., Chen H. -W., Rauch M., Qu Z., Johnson S. D., Schaye J., Rudie G. C., Li J. I., Liu Z., Zahedy F. S., Cantalupo S., and Boettcher E.

Abstract

Turbulent motions in the circumgalactic medium play a critical role in regulating the evolution of galaxies, yet their detailed characterization remains elusive. Using two-dimensional velocity maps constructed from spatially extended [O ii] and [O iii] emission, Chen et al. measured the velocity structure functions (VSFs) of four quasar nebulae at z ≈ 0.5-1.1. One of these exhibits a spectacular Kolmogorov relation. Here, we carry out an ensemble study using an expanded sample incorporating four new nebulae from three additional quasi-stellar object (QSO) fields. The VSFs measured for all eight nebulae are best explained by subsonic turbulence revealed by the line-emitting gas, which in turn strongly suggests that the cool gas (T ∼ 104 K) is dynamically coupled to the hot ambient medium. Previous work demonstrates that the largest nebulae in our sample reside in group environments with clear signs of tidal interactions, suggesting that environmental effects are vital in seeding and enhancing the turbulence within the gaseous halos, ultimately promoting the formation of the extended nebulae. No discernible differences are observed in the VSF properties between radio-loud and radio-quiet QSO fields. We estimate the turbulent heating rate per unit volume, Q turb, in the QSO nebulae to be ∼10−26-10−22 erg cm−3 s−1 for the cool phase and ∼10−28-10−25 erg cm−3 s−1 for the hot phase. This range aligns with measurements in the intracluster medium and star-forming molecular clouds but is ∼103 times higher than the Q turb observed inside cool gas clumps on scales ≲1 kpc using absorption-line techniques. We discuss the prospect of bridging the gap between emission and absorption studies by pushing the emission-based VSF measurements to below ≈10 kpc.

Published
2024

5. MALS discovery of a rare H I 21 cm absorber at z ∼ 1.35: Origin of the absorbing gas in powerful active galactic nuclei.

Author

Deka, P. P., Gupta, N., Chen, H. W., Johnson, S. D., Noterdaeme, P., Combes, F., Boettcher, E., Balashev, S. A., Emig, K. L., Józsa, G. I. G., Klöckner, H.-R., Krogager, J-. K., Momjian, E., Petitjean, P., Rudie, G. C., Wagenveld, J., and Zahedy, F. S.

Subjects
ACTIVE galactic nuclei, RADIO galaxies, INTERSTELLAR medium, TRACE gases, ACTINIC flux, QUASARS
Abstract

We report a new, rare detection of H I 21 cm absorption associated with a quasar (only six quasars are known at 1 < z < 2) toward J2339−5523 at zem = 1.3531, discovered through the MeerKAT Absorption Line Survey (MALS). The absorption profile is broad (∼400 km s−1), and the peak is redshifted by ∼200 km s−1 from zem. Interestingly, optical/far-UV spectra of the quasar from the Magellan-MIKE/HST-COS spectrographs do not show any absorption features associated with the 21 cm absorption, despite the coincident presence of the optical quasar and the radio core inferred from a flat-spectrum component with a flux density of ∼65 mJy at high frequencies (> 5 GHz). The simplest explanation would be that no large H I column (N(H I) > 1017 cm−2) is present toward the radio core and the optical active galactic nucleus. Based on the joint optical and radio analysis of a heterogeneous sample of 16 quasars (zmedian = 0.7) and 19 radio galaxies (zmedian = 0.4) with H I 21 cm absorption detection and matched in 1.4 GHz luminosity (L1.4 GHz), a consistent picture emerges according to which quasars primarily trace the gas in the inner circumnuclear disk and cocoon created by the interaction of the jet with interstellar medium. They (i.e., quasars) exhibit a L1.4 GHz – ΔVnull correlation and a frequent mismatch of the radio and optical spectral lines. The radio galaxies show no such correlation and likely trace the gas from the cocoon and the galaxy-wide interstellar medium outside the photoionization cone. The analysis presented here demonstrates the potential of radio spectroscopic observations to reveal the origin of the absorbing gas associated with active galactic nuclei that may be missed in optical observations. [ABSTRACT FROM AUTHOR]

Published
2024
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6. EMPRESS. VI. Outflows Investigated in Low-mass Galaxies with M*=104-107 M (circle dot):Weak Feedback in Low-mass Galaxies?

Author

Xu, Yi, Ouchi, M., Rauch, Michael, Nakajima, Kimihiko, Harikane, Yuichi, Sugahara, Yuma, Komiyama, Yutaka, Kusakabe, Haruka, Fujimoto, Seiji, Isobe, Yuki, Kim, Ji-Hoon, Ono, Yasuhirov, Zahedy, F S., Xu, Yi, Ouchi, M., Rauch, Michael, Nakajima, Kimihiko, Harikane, Yuichi, Sugahara, Yuma, Komiyama, Yutaka, Kusakabe, Haruka, Fujimoto, Seiji, Isobe, Yuki, Kim, Ji-Hoon, Ono, Yasuhirov, and Zahedy, F S.

Published
2022

7. The Cosmic Ultraviolet Baryon Survey (CUBS) V: on the thermodynamic properties of the cool circumgalactic medium at z ≲ 1

Author

Qu, Z, Chen, H, C Rudie, G, S Zahedy, F, D Johnson, S, Boettcher, E, Cantalupo, S, C Chen, M, L Cooksey, K, Depalma, D, Faucher-Giguère, C, Rauch, M, Schaye, J, A Simcoe, R, Qu, Z, Chen, H, C Rudie, G, S Zahedy, F, D Johnson, S, Boettcher, E, Cantalupo, S, C Chen, M, L Cooksey, K, Depalma, D, Faucher-Giguère, C, Rauch, M, Schaye, J, and A Simcoe, R

Abstract

This paper presents a systematic study of the photoionization and thermodynamic properties of the cool circumgalactic medium (CGM) as traced by rest-frame ultraviolet absorption lines around 26 galaxies at redshift z less than or similar to 1. The study utilizes both high-quality far-ultraviolet and optical spectra of background QSOs and deep galaxy redshift surveys to characterize the gas density, temperature, and pressure of individual absorbing components and to resolve their internal non-thermal motions. The derived gas density spans more than three decades, from log(n(H)/cm(-3)) approximate to -4 to -1, while the temperature of the gas is confined in a narrow range of log (T/K) approximate to 4.3 +/- 0.3. In addition, a weak anticorrelation between gas density and temperature is observed, consistent with the expectation of the gas being in photoionization equilibrium. Furthermore, decomposing the observed line widths into thermal and non-thermal contributions reveals that more than 30 per cent of the components at z less than or similar to 1 exhibit line widths driven by non-thermal motions, in comparison to <20 per cent found at z approximate to 2-3. Attributing the observed non-thermal line widths to intra-clump turbulence, we find that massive quenched galaxies on average exhibit higher non-thermal broadening/turbulent energy in their CGM compared to star-forming galaxies at z less than or similar to 1. Finally, strong absorption features from multiple ions covering a wide range of ionization energy (e.g. from Mg II to O IV) can be present simultaneously in a single absorption system with kinematically aligned component structure, but the inferred pressure in different phases may differ by a factor of approximate to 10.

Published
2022

8. Characterizing circumgalactic gas around massive ellipticals at z ≈ 0.4-III. the galactic environment of a chemically pristine Lyman limit absorber

Author

Chen, H, Johnson, S, Straka, L, Zahedy, F, Schaye, J, Muzahid, S, Bouche, N, Cantalupo, S, Marino, R, Wendt, M, Chen H. -W., Johnson S. D., Straka L. A., Zahedy F. S., Schaye J., Muzahid S., Bouche N., Cantalupo S., Marino R. A., Wendt M., Chen, H, Johnson, S, Straka, L, Zahedy, F, Schaye, J, Muzahid, S, Bouche, N, Cantalupo, S, Marino, R, Wendt, M, Chen H. -W., Johnson S. D., Straka L. A., Zahedy F. S., Schaye J., Muzahid S., Bouche N., Cantalupo S., Marino R. A., and Wendt M.

Abstract

This paper presents a study of the galactic environment of a chemically pristine (<0.6 per cent solar metallicity) Lyman Limit system (LLS) discovered along the sightline towards QSO SDSSJ 135726.27+043541.4 (zQSO = 1.233) at projected distance d = 126 physical kpc (pkpc) from a luminous red galaxy (LRG) at z = 0.33. Combining deep Hubble Space Telescope images, MUSE integral field spectroscopic data, and wide-field redshift survey data has enabled an unprecedented, ultradeep view of the environment around this LRG-LLS pair. A total of 12 galaxies, including the LRG, are found at d 400 pkpc and line-of-sight velocity v < 600 km s-1 of the LLS, with intrinsic luminosity ranging from 0.001 L∗ to 2 L∗ and a corresponding stellar mass range of Mstar 107-11 M. All 12 galaxies contribute to a total mass of Mstar = 1.6 × 1011 M with80 per cent contained in the LRG. The line-of-sight velocity dispersion of these galaxies is found to be s group = 230 km s-1 with the centre of mass at d group = 118 pkpc and line-of-sight velocity offset of vgroup = 181 km s-1 from the LLS. Three of these are located at d 100 pkpc from the LLS, and they are all faint with intrinsic luminosity < 0.02 L∗ and gas-phase metallicity of10 per cent solar in their interstellar medium. The disparity in the chemical enrichment level between the LLS and the group members suggests that the LLS originates in infalling intergalactic medium and that parts of the intergalactic gas near old and massive galaxies can still remain chemically pristine through the not too distant past.

Published
2019

9. The Cosmic Ultraviolet Baryon Survey (CUBS) V: on the thermodynamic properties of the cool circumgalactic medium at z ≲ 1

Author

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-André Faucher-Giguère, Michael Rauch, Joop Schaye, Robert A Simcoe, Qu, Z, Chen, H, C Rudie, G, S Zahedy, F, D Johnson, S, Boettcher, E, Cantalupo, S, C Chen, M, L Cooksey, K, Depalma, D, Faucher-Giguère, C, Rauch, M, Schaye, J, and A Simcoe, R

Subjects
quasars: absorption lines, Galaxies - haloes, galaxies: haloe, Space and Planetary Science, Astronomy and Astrophysics, Quasars - absorption lines, survey, intergalactic medium, Surveys, Astrophysics - Astrophysics of Galaxies
Abstract

This paper presents a systematic study of the photoionization and thermodynamic properties of the cool circumgalactic medium (CGM) as traced by rest-frame ultraviolet absorption lines around 26 galaxies at redshift $z\lesssim1$. The study utilizes both high-quality far-ultraviolet and optical spectra of background QSOs and deep galaxy redshift surveys to characterize the gas density, temperature, and pressure of individual absorbing components and to resolve their internal non-thermal motions. The derived gas density spans more than three decades, from $\log (n_{\rm H}/{\rm cm^{-3}}) \approx -4$ to $-1$, while the temperature of the gas is confined in a narrow range of $\log (T/{\rm K})\approx 4.3\pm 0.3$. In addition, a weak anti-correlation between gas density and temperature is observed, consistent with the expectation of the gas being in photoionization equilibrium. Furthermore, decomposing the observed line widths into thermal and non-thermal contributions reveals that more than 30% of the components at $z\lesssim 1$ exhibit line widths driven by non-thermal motions, in comparison to $, Comment: 16 pages, 4 figures, 1 table, accepted for publication in MNRAS

Published
2022

10. The cosmic ultraviolet baryon survey (CUBS)

Author

Jenny E. Greene, Robert A. Simcoe, Gregory Walth, Sebastiano Cantalupo, Marc Rafelski, Mandy C. Chen, Michael Rauch, Mary E. Putman, Kathy L. Cooksey, Joop Schaye, Thomas J. Cooper, Sebastian Lopez, Steven V. Penton, Erin Boettcher, Hsiao-Wen Chen, Claude André Faucher-Giguère, Gwen C. Rudie, Sean D. Johnson, John S. Mulchaey, Patrick Petitjean, Fakhri S. Zahedy, Cooper, T, Rudie, G, Chen, H, Johnson, S, Zahedy, F, Chen, M, Boettcher, E, Walth, G, Cantalupo, S, Cooksey, K, Faucher-Giguere, C, Greene, J, Lopez, S, Mulchaey, J, Penton, S, Petitjean, P, Putman, M, Rafelski, M, Rauch, M, Schaye, J, and Simcoe, R

Subjects
Stellar mass, Cosmic Origins Spectrograph, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics - astrophysics of galaxies, FOS: Physical sciences, quasars: absorption line, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Surveys, Spectral line, symbols.namesake, galaxies: haloe, Astrophysics::Solar and Stellar Astrophysics, survey, Absorption (logic), Galaxies: haloes, Astrophysics::Galaxy Astrophysics, Intergalactic medium, Physics, Balmer series, Astronomy and Astrophysics, Quasars: absorption lines, Galaxy, Lyman limit, Baryon, haloes, intergalactic medium, quasars: absorption lines [surveys, galaxies], Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), symbols
Abstract

We present a detailed study of two partial Lyman limit systems (pLLSs) of neutral hydrogen column density $N_\mathrm{H\,I}\approx(1-3)\times10^{16}\,\mathrm{cm}^{-2}$ discovered at $z=0.5$ in the Cosmic Ultraviolet Baryon Survey (CUBS). Available far-ultraviolet spectra from the Hubble Space Telescope Cosmic Origins Spectrograph and optical echelle spectra from MIKE on the Magellan Telescopes enable a comprehensive ionization analysis of diffuse circumgalactic gas based on resolved kinematics and abundance ratios of atomic species spanning five different ionization stages. These data provide unambiguous evidence of kinematically aligned multi-phase gas that masquerades as a single-phase structure and can only be resolved by simultaneous accounting of the full range of observed ionic species. Both systems are resolved into multiple components with inferred $\alpha$-element abundance varying from $[\alpha/\text{H}]\approx\!{-0.8}$ to near solar and densities spanning over two decades from $\log n_\mathrm{H}\mathrm{cm}^{-3}\approx\!-2.2$ to $, Comment: Accepted for publication in MNRAS, 27 pages, 21 figures

Published
2021

11. The cosmic ultraviolet baryon survey (CUBS) - I. overview and the diverse environments of lyman limit systems at z < 1

Author

Thomas M. Cooper, Claude André Faucher-Giguère, Erin Boettcher, Gregory Walth, Benjamin J. Weiner, Mandy C. Chen, Mary E. Putman, Michael Rauch, Sean D. Johnson, Joop Schaye, Kathy L. Cooksey, Fakhri S. Zahedy, Marc Rafelski, Steven V. Penton, Robert A. Simcoe, Hsiao-Wen Chen, Gwen C. Rudie, Jenny E. Greene, Sebastiano Cantalupo, Sebastian Lopez, Patrick Petitjean, John S. Mulchaey, Chen, H, Zahedy, F, Boettcher, E, Cooper, T, Johnson, S, Rudie, G, Chen, M, Walth, G, Cantalupo, S, Cooksey, K, Faucher-Giguere, C, Greene, J, Lopez, S, Mulchaey, J, Penton, S, Petitjean, P, Putman, M, Rafelski, M, Rauch, M, Schaye, J, Simcoe, R, and Weiner, B

Subjects
Physics, 010308 nuclear & particles physics, Library science, Galaxies: evolution, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Astrophysics - Astrophysics of Galaxies, Lyman limit, Spitzer Space Telescope, 13. Climate action, Space and Planetary Science, Observatory, evolution, galaxies: haloes, quasars: absorption lines [surveys, galaxies], 0103 physical sciences, Quasars: absorption line, European commission, Galaxies: haloe, Survey, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

We present initial results from the Cosmic Ultraviolet Baryon Survey (CUBS). CUBS is designed to map diffuse baryonic structures at redshift z~ 17.2 over a total redshift survey pathlength of dz=9.3, and a number density of n(z)=0.43 (-0.18, +0.26). Considering all absorbers with log N(HI)/cm^-2 > 16.5 leads to n(z)=1.08 (-0.25, +0.31) at z, Comment: 26 pages, 14 figures, MNRAS in press

Published
2020

12. The Cosmic Ultraviolet Baryon Survey (CUBS) II: Discovery of an H$_{2}$-Bearing DLA in the Vicinity of an Early-Type Galaxy at z = 0.576

Author

Thomas J. Cooper, Fakhri S. Zahedy, Robert A. Simcoe, Jenny E. Greene, Sebastiano Cantalupo, Sebastian Lopez, John S. Mulchaey, Mary E. Putman, Patrick Petitjean, Steven V. Penton, Hsiao-Wen Chen, Gwen C. Rudie, Mandy C. Chen, Gregory Walth, Sean D. Johnson, Claude André Faucher-Giguère, Joop Schaye, Erin Boettcher, Marc Rafelski, Michael Rauch, Kathy L. Cooksey, Boettcher, E, Chen, H, Zahedy, F, Cooper, T, Johnson, S, Rudie, G, Chen, M, Petitjean, P, Cantalupo, S, Cooksey, K, Faucher-Gigu re, C, Greene, J, Lopez, S, Mulchaey, J, Penton, S, Putman, M, Rafelski, M, Rauch, M, Schaye, J, Simcoe, R, and Walth, G

Subjects
Circumgalactic medium, Astrophysics - astrophysics of galaxies, FOS: Physical sciences, Astrophysics, medicine.disease_cause, 01 natural sciences, law.invention, Extragalactic astronomy, law, Interstellar medium, Galaxy group, 0103 physical sciences, galaxies, medicine, 010303 astronomy & astrophysics, Physics, Galaxy groups, COSMIC cancer database, Bearing (mechanical), 010308 nuclear & particles physics, Astronomy and Astrophysics, Interstellar molecules, Galaxy, Baryon, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), 1879, 506, 1317, 849, 847, 597, Quasar absorption line spectroscopy, Ultraviolet
Abstract

We report the serendipitous detection of an H$_{2}$-bearing damped Lyman-$��$ absorber at z = 0.576 in the spectrum of the QSO J0111-0316 in the Cosmic Ultraviolet Baryon Survey. Spectroscopic observations from HST-COS in the far-ultraviolet reveal a damped absorber with log[N(HI)/cm^-2] = 20.1 +/- 0.2 and log[N(H$_{2}$)/cm^-2] = 18.97 (-0.06, +0.05). The diffuse molecular gas is found in two velocity components separated by dv = 60 km/s, with >99.9% of the total H$_{2}$ column density concentrated in one component. At a metallicity of $\approx$ 50% of solar, there is evidence for Fe enhancement and dust depletion, with a dust-to-gas ratio $��_{\text{O}} \approx$ 0.4. A galaxy redshift survey conducted with IMACS and LDSS-3C on Magellan reveals an overdensity of nine galaxies at projected distance d, 19 pages, 6 figures. Accepted for publication in ApJ

Published
2020
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13. Characterizing circumgalactic gas around massive ellipticals at z ≈ 0.4 – III. The galactic environment of a chemically pristine Lyman limit absorber

Author

Nicolas Bouché, Sebastiano Cantalupo, Lorrie A. Straka, Martin Wendt, Fakhri S. Zahedy, Hsiao-Wen Chen, Raffaella Anna Marino, Sowgat Muzahid, Sean D. Johnson, Joop Schaye, Leiden Observatory [Leiden], Universiteit Leiden [Leiden], Équipe de droit international, européen et comparé (EDIEC), Université Jean Moulin - Lyon 3 (UJML), Université de Lyon-Université de Lyon, Department of Computer Science [ETH Zürich] (D-INFK), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology in Zürich [Zürich] (ETH Zürich), Universiteit Leiden, Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Centre de Recherche Astrophysique de Lyon (CRAL), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), Chen, H, Johnson, S, Straka, L, Zahedy, F, Schaye, J, Muzahid, S, Bouche, N, Cantalupo, S, Marino, R, and Wendt, M

Subjects
Stellar mass, [SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Metallicity, elliptical and lenticular, cD, galaxies: formation, intergalactic medium, quasars: absorption lines [galaxies], FOS: Physical sciences, Astrophysics, Galaxies: formation, 01 natural sciences, 0103 physical sciences, Quasars: absorption line, 010303 astronomy & astrophysics, ComputingMilieux_MISCELLANEOUS, Intergalactic medium, Physics, 010308 nuclear & particles physics, Velocity dispersion, Astronomy and Astrophysics, Redshift survey, Astrophysics - Astrophysics of Galaxies, Galaxy, Lyman limit, Interstellar medium, Galaxies: elliptical and lenticular, cD, 13. Climate action, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Intergalactic travel
Abstract

This paper presents a study of the galactic environment of a chemically-pristine (, Comment: 13 pages, 4 figures, published in MNRAS

Published
2019
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