Two merging galaxy clusters with very hot shock fronts observed shortly before pericentric passage

Laganá, T. F.; S., Souza, Gilvan; Machado, Rubens E. G.; Volert, R. C.; Lopes, P. A. A.

doi:10.1093/mnras/stz1575

Cited by 6 publications

(4 citation statements)

References 56 publications

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“…Abell 4059 is a relaxed, cool-core cluster (Laganá et al 2019) at z = 0.048 (Abell et al 1989), dominated by the cD galaxy ESO 349-G010 (R. A. 23:57:00.74, decl.…”

Section: Introductionmentioning

confidence: 99%

Unveiling the Interplay between the GASP Jellyfish Galaxy JO194 and Its Environment with Chandra

Bartolini

Ignesti

Gitti

et al. 2022

ApJ

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X-ray studies of jellyfish galaxies opened a window into the physics of the interplay between the intracluster medium (ICM) and interstellar medium (ISM). In this paper, we present the study of an archival Chandra observation of the GASP jellyfish galaxy JO194. We observe X-ray emission extending from the stellar disk to the unwinding spiral arms with an average temperature of kT = 0.79 ± 0.03 keV. To investigate the origin of the X-ray emission, we compare the observed X-ray luminosities with those expected from the star formation rates (SFRs) obtained from Hα emission. We estimate an X-ray luminosity excess of a factor ∼2–4 with respect to the SF; therefore, we conclude that SF is not the main event responsible for the extended X-ray emission of JO194. The metallicity in the spiral arms ( Z = 0.24 − 0.12 + 0.19 Z ⊙ ) is consistent with that of the ICM around JO194 (Z = 0.35 ± 0.07); thus, we suggest that ICM radiative cooling dominates the X-ray emission of the arms. We speculate that the X-ray plasma results from the ISM‒ICM interplay, although the nature of this interplay is still mostly unknown. Finally, we observe that the X-ray properties of JO194 are consistent with those of two other GASP galaxies with different stellar mass, phase-space conditions in their hosting clusters, and local ICM conditions. We suggest that the conditions required to induce extended X-ray emission in jellyfish galaxies are established at the beginning of the stripping, and they can persist on long timescales so that galaxies in different clusters and evolutionary stages can present a similar extended X-ray emission.

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“…Abell 4059 is a relaxed, cool-core cluster (Laganá et al 2019) at z = 0.048 (Abell et al 1989), dominated by the cD galaxy ESO 349-G010 (R. A. 23:57:00.74, decl.…”

Section: Introductionmentioning

confidence: 99%

Unveiling the Interplay between the GASP Jellyfish Galaxy JO194 and Its Environment with Chandra

Bartolini

Ignesti

Gitti

et al. 2022

ApJ

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“…These considerations about projection effects on gas properties are also relevant when analysing shock fronts in cluster mergers (e.g. Machado & Lima Neto 2013;Laganá et al 2019b;Chadayammuri et al 2021).…”

Section: The Spiral-like Morphologymentioning

confidence: 99%

Simulating nearly edge-on sloshing in the galaxy cluster Abell 2199

Machado,

Laganá,

Souza

et al. 2022

Preprint

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Off-axis collisions between galaxy clusters may induce the phenomenon of sloshing, causing dense gas to be dragged from the cool core of a cluster, resulting in a spiral of enhanced Xray emission. Abell 2199 displays signatures of sloshing in its core and it is possible that the orbital plane of the collision is seen nearly edge-on. We aim to evaluate whether the features of Abell 2199 can be explained by a sloshing spiral seen under a large inclination angle.To address this, we perform tailored hydrodynamical N-body simulations of a non-frontal collision with a galaxy group of M 200 = 1.6 × 10 13 M . We obtain a suitable scenario in which the group passed by the main cluster core 0.8 Gyr ago, with a pericentric separation of 292 kpc. Good agreement is obtained from the temperature maps as well as the residuals from a β-model fit to the simulated X-ray emission. We find that under an inclination of i = 70 • the simulation results remain consistent with the observations.

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“…To overcome these limitations, we consider the impacts on multiple dynamical state indicators over a complete range of merger stages, from first infall through final coalescence and eventually to several gigayears after coalescence. Mergers are energetic events that perturb the cluster dynamical state (Biviano et al 2006;Laganá et al 2019;Li et al 2022;Zhang et al 2022). There are two main factors that impact the rate at which objects pass through the merger stages.…”

Section: Introductionmentioning

confidence: 99%

New Observational Recipes for Measuring Dynamical States of Galaxy Clusters

Kim,

Smith,

et al. 2024

ApJ

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During cluster assembly, a cluster’s virialization process leaves behind signatures that can provide information on its dynamical state. However, no clear consensus yet exists on the best way to achieve this. Therefore, we attempt to derive improved recipes for classifying the dynamical states of clusters in observations using cosmological simulations. The cluster halo mass and their subhalos’ mass are used to 1014 M ⊙ h −1 and 1010 M ⊙ h −1 to calculate five independent dynamical state indicators. We experiment with recipes by combining two to four indicators for detecting specific merger stages, like recent and ancient mergers. These recipes are made by plotting merging clusters and a control sample of relaxed clusters in multiple-indicator parameter space, then applying a rotation matrix method to derive the best way to separate mergers from the control sample. The success of the recipe is quantified using the success rate and overlap percentage of the merger and control histograms along the newly rotated x-axis. This provides us with recipes using different numbers of combined indicators and for different merger stages. Among the recipes, the stellar mass gap and center offset are the first and second most dominant of the indicators, and using more indicators improves the effectiveness of the recipe. When applied to observations, our results show good agreement with literature values of cluster dynamical states.

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Two merging galaxy clusters with very hot shock fronts observed shortly before pericentric passage

Cited by 6 publications

References 56 publications

Unveiling the Interplay between the GASP Jellyfish Galaxy JO194 and Its Environment with Chandra

Unveiling the Interplay between the GASP Jellyfish Galaxy JO194 and Its Environment with Chandra

Simulating nearly edge-on sloshing in the galaxy cluster Abell 2199

New Observational Recipes for Measuring Dynamical States of Galaxy Clusters

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