A Comprehensive Investigation of Metals in the Circumgalactic Medium of Nearby Dwarf Galaxies

Zheng 郑, Yong 永; Faerman, Yakov; Oppenheimer, Benjamin D.; Putman, Mary E.; McQuinn, Kristen B. W.; Kirby, Evan N.; Burchett, Joseph N.; Telford, O. Grace; Werk, Jessica K.; Kim, Doyeon A.

doi:10.3847/1538-4357/acfe6b

Cited by 10 publications

(1 citation statement)

References 95 publications

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“…For sub-L * galaxies, the predicted O VI is consistent with observations, indicating O VI is also abundant in the outskirts of these galaxy halos. On the other hand, the observed O VI mass in the CGM of dwarf galaxies or massive quiescent galaxies is significantly lower than the model prediction, suggesting that the typical ionization state in these halos is offset from O VI, assuming f CGM ≈ 0.3 (see also Zahedy et al 2019;Zheng et al 2024). However, the CGM mass fraction in dwarf galaxies may be as low as ≈0.1 (e.g., Schaller et al 2015;Hafen et al 2019), which also affects the O VI mass.…”

Section: Total Mass Of the Warm-hot Cgm Probed By O VI And Ne Viiimentioning

confidence: 87%

The Cosmic Ultraviolet Baryon Survey (CUBS). VII. On the Warm-hot Circumgalactic Medium Probed by O vi and Ne viii at 0.4 ≲ z ≲ 0.7

Qu,

Chen,

Johnson

et al. 2024

ApJ

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This paper presents a newly established sample of 103 unique galaxies or galaxy groups at 0.4 ≲ z ≲ 0.7 from the Cosmic Ultraviolet Baryon Survey (CUBS) for studying the warm-hot circumgalactic medium (CGM) probed by both O vi and Ne viii absorption. The galaxies and associated neighbors are identified at <1 physical Mpc from the sightlines toward 15 CUBS QSOs at z QSO ≳ 0.8. A total of 30 galaxies or galaxy groups exhibit associated O vi λ λ 1031, 1037 doublet absorption within a line-of-sight velocity interval of ±250 km s−1, while the rest show no trace of O vi to a detection limit of log N OVI / cm − 2 ≈ 13.7 . Meanwhile, only five galaxies or galaxy groups exhibit the Ne viii λ λ 770, 780 doublet absorption, down to a limiting column density of log N NeVIII / cm − 2 ≈ 14.0 . These O vi- and Ne viii-bearing halos reside in different galaxy environments with stellar masses ranging from log M star / M ⊙ ≈ 8 to ≈11.5. The warm-hot CGM around galaxies of different stellar masses and star formation rates exhibits different spatial profiles and kinematics. In particular, star-forming galaxies with log M star / M ⊙ ≈ 9 – 11 show a significant concentration of metal-enriched warm-hot CGM within the virial radius, while massive quiescent galaxies exhibit flatter radial profiles of both column densities and covering fractions. In addition, the velocity dispersion of O vi absorption is broad with σ υ > 40 km s−1 for galaxies of log M star / M ⊙ > 9 within the virial radius, suggesting a more dynamic warm-hot halo around these galaxies. Finally, the warm-hot CGM probed by O vi and Ne viii is suggested to be the dominant phase in sub-L* galaxies with log M star / M ⊙ ≈ 9 – 10 based on their high ionization fractions in the CGM.

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Section: Total Mass Of the Warm-hot Cgm Probed By O VI And Ne Viiimentioning

confidence: 87%

The Cosmic Ultraviolet Baryon Survey (CUBS). VII. On the Warm-hot Circumgalactic Medium Probed by O vi and Ne viii at 0.4 ≲ z ≲ 0.7

Qu,

Chen,

Johnson

et al. 2024

ApJ

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The Smallest Scale of Hierarchy Survey (SSH)

Sacchi,

Bellazzini,

Annibali

et al. 2024

A&A

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We present new deep, wide-field imaging data from the Large Binocular Telescope (LBT) in $g$ and $r$ bands from the Smallest Scale of Hierarchy Survey (SSH) that reveal previously undetected tidal features and stellar streams in the outskirts of six dwarf irregular galaxies (NGC 5238, UGC 6456, UGC 6541, UGC 7605, UGC 8638, and UGC 8760) with stellar masses in the range $1.2 odot $ to $1.4 odot $. The six dwarfs are located 1-2 Mpc away from large galaxies, which implies that the observed distortions are unlikely to be due to tidal effects from a nearby, massive companion. At the distances of sim 3-4 Mpc at which the dwarfs lie, the identified tidal features are all resolved into individual stars in the LBT images and appear to consist of a population older than 1-2 Gyr. This excludes the possibility that they result from irregular and asymmetric star formation episodes that are common in gas-rich dwarf galaxies. The most plausible explanation is that we witness the hierarchical merging assembly of these dwarfs with their satellite populations. This scenario is also supported by the peculiar morphology and disturbed velocity field of their HI component. From the SSH sample, we estimate that a fraction of sim 13<!PCT!> of the late-type dwarfs show signs of merging with satellites. This is in agreement with other recent independent studies and theoretical predictions within the Lambda CDM cosmological framework.

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The H i covering fraction of Lyman Limit Systems in FIRE haloes

Tortora,

Feldmann,

Bernardini

et al. 2024

Monthly Notices of the Royal Astronomical Society

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Atomic hydrogen (H i) serves a crucial role in connecting galactic-scale properties such as star formation with the large-scale structure of the Universe. While recent numerical simulations have successfully matched the observed covering fraction of H i near Lyman Break Galaxies (LBGs) and in the foreground of luminous quasars at redshifts $z \lesssim 3$, the low-mass end remains as-of-yet unexplored in observational and computational surveys. We employ a cosmological, hydrodynamical simulation (FIREbox) supplemented with zoom-in simulations (MassiveFIRE) from the Feedback In Realistic Environments (FIRE) project to investigate the H i covering fraction of Lyman Limit Systems ($N_{{\text{H}}\, \rm{{\small I}}} \gtrsim 10^{17.2}$ cm$^{-2}$) across a wide range of redshifts ($z=0-6$) and halo masses ($10^8-10^{13} \, \,\mathrm{ M}_{\odot }$ at $z=0$, $10^8-10^{11}\, \,\mathrm{ M}_{\odot }$ at $z=6$) in the absence of feedback from active galactic nuclei. We find that the covering fraction inside haloes exhibits a strong increase with redshift, with only a weak dependence on halo mass for higher mass haloes. For massive haloes ($M_{\mathrm{vir}} \sim 10^{11}-10^{12} \,\mathrm{ M}_{\odot }$), the radial profiles showcase scale-invariance and remain independent of mass. The radial dependence is well captured by a fitting function. The covering fractions in our simulations are in good agreement with measurements of the covering fraction in LBGs. Our comprehensive analysis unveils a complex dependence with redshift and halo mass for haloes with $M_{\mathrm{vir}} \lesssim 10^{10} \,\mathrm{ M}_{\odot }$ that future observations aim to constrain, providing key insights into the physics of structure formation and gas assembly.

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A Comprehensive Investigation of Metals in the Circumgalactic Medium of Nearby Dwarf Galaxies

Cited by 10 publications

References 95 publications

The Cosmic Ultraviolet Baryon Survey (CUBS). VII. On the Warm-hot Circumgalactic Medium Probed by O vi and Ne viii at 0.4 ≲ z ≲ 0.7

The Cosmic Ultraviolet Baryon Survey (CUBS). VII. On the Warm-hot Circumgalactic Medium Probed by O vi and Ne viii at 0.4 ≲ z ≲ 0.7

The Smallest Scale of Hierarchy Survey (SSH)

The H i covering fraction of Lyman Limit Systems in FIRE haloes

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