Cluster-subcluster mergers and the formation of narrow-angle tailed radio sources

Bliton, M.; Rizza, E.; Burns, J. O.; Owen, F. N.; Ledlow, M. J.

doi:10.1111/j.1365-8711.1998.01973.x

Cited by 34 publications

(3 citation statements)

References 58 publications

(82 reference statements)

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“…The presence of the two galaxy number density peaks and the elongated X-ray morphology between them strongly suggest that A514 is currently undergoing a binary merger in the NW-SE direction. Previous observations have reported three headtail radio galaxies in A514 (Burns et al 1994;Bliton et al 1998;Govoni et al 2001), which are all classified as spectroscopic members (Owen et al 1995;Katgert et al 1998). With our new uGMRT radio observations, we revealed the bent morphology in these three radio galaxies.…”

Section: A Large-scale Bent Radio Jet In A514supporting

confidence: 50%

Discovery of A Large-scale Bent Radio Jet in the Merging Cluster A514

Lee,

ZuHone,

James Jee

et al. 2023

ApJL

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We report a discovery of a large-scale bent radio jet in the merging galaxy cluster A514 (z = 0.071). The radio emission originates from the two radio lobes of the active galactic nucleus (AGN) located near the center of the southern subcluster and extends toward the southern outskirts with multiple bends. Its peculiar morphology is characterized by a 400 kpc “bridge,” a 300 kpc “arc,” and a 400 kpc “tail,” which together contribute to its largest linear size of ∼0.7 Mpc. We find that both the flux and spectral features of the emission change with the distance from the AGN. Also, the “bridge” presents a 60% polarized radio emission, which coincided with an X-ray cold front. Based on our multiwavelength observations, we propose that A514 presents a clear case for the redistribution of an old AGN plasma due to merger-driven gas motions. We support our interpretation with idealized cluster merger simulations employing a passive tracer field to represent cosmic-ray electrons and find that merger-driven motions can efficiently create a cloud of these particles in the cluster outskirts, which later can be reaccelerated by the cluster merger shock and produce radio relics.

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Section: A Large-scale Bent Radio Jet In A514supporting

confidence: 50%

Discovery of A Large-scale Bent Radio Jet in the Merging Cluster A514

Lee,

ZuHone,

James Jee

et al. 2023

ApJL

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“…Evidence of dynamical substructure was also found with optical spectroscopy of the member galaxies (Oegerle et al 1995). Interestingly, the presence of a narrow-angle tailed radio galaxy may be explained by significant bulk motions in the ICM, as suggested by the statistical analysis of Bliton et al (1998). Finally, Cuciti et al (2015) reported A2142 to have a radio halo.…”

Section: Abell 2142mentioning

confidence: 74%

Searching for Bulk Motions in the Intracluster Medium of Massive, Merging Clusters With Chandra CCD Data

Liu

Tozzi

et al. 2016

ApJ

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We search for bulk motions in the intracluster medium (ICM) of massive clusters showing evidence of an ongoing or recent major merger with spatially resolved spectroscopy in Chandra CCD data. We identify a sample of six merging clusters with >150 ks Chandra exposure in the redshift range 0.1 <z< 0.3. By performing X-ray spectral analysis of projected ICM regions selected according to their surface brightness, we obtain the projected redshift maps for all of these clusters. After performing a robust analysis of the statistical and systematic uncertainties in the measured X-ray redshift z X , we check whether or not the global z X distribution differs from that expected when the ICM is at rest. We find evidence of significant bulk motions at more than 3σ in A2142 and A115, and less than 2σ in A2034 and A520. Focusing on single regions, we identify significant localized velocity differences in all of the merger clusters. We also perform the same analysis on two relaxed clusters with no signatures of recent mergers, finding no signs of bulk motions, as expected. Our results indicate that deep Chandra CCD data enable us to identify the presence of bulk motions at the level of v BM >1000 km s −1 in the ICM of massive merging clusters at 0.1<z<0.3. Although the CCD spectral resolution is not sufficient for a detailed analysis of the ICM dynamics, Chandra CCD data constitute a key diagnostic tool complementing X-ray bolometers on board future X-ray missions.

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“…NATs are generally thought to be formed via ram pressure resulting from the high-speed infall or orbital motions of the host galaxy relative to the ICM. However, Bliton et al (1998) suggest that, in many cases, the orbital velocity of the host galaxy is simply not high enough to produce the high degree of bending seen in NATs. They present an alternative scenario of NAT formation due to the host cluster experiencing a merger event.…”

Section: Introductionmentioning

confidence: 99%

CHANDRA X-Ray Observations of A119: Cold Fronts and a Shock in an Evolved Off-axis Merger

Watson,

Blanton,

Randall

et al. 2023

ApJ

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We present Chandra X-ray observations of the dynamically complex galaxy cluster A119 (z = 0.044). A119 is host to two narrow-angle-tail (NAT) radio sources (0053-015 and 0053-016), whose tails are oriented parallel to each other, despite orthogonally oriented jet axes. Imaging and spectral analysis reveal X-ray emission elongated along the NE–SW axis, along with the presence of complex structures, including surface brightness discontinuities, which suggest possible merger activity along this axis. From radial profiles of the X-ray surface brightness, temperature, pressure, and density, we identify two surface brightness edges that are found to be cold fronts, possibly associated with large-scale sloshing of intracluster medium gas. We also identify a brightness edge to the S that is found to be a shock front with Mach number M = 1.21 ± 0.11, consistent with a merger shock. In addition, previous optical studies show the alignment of optical substructures along the N–S direction. The elongated X-ray emission, orientations of the NAT tails, and alignment of the optical substructure all suggest recent or ongoing merger activity in the NE–SW direction.

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Cluster-subcluster mergers and the formation of narrow-angle tailed radio sources

Cited by 34 publications

References 58 publications

Discovery of A Large-scale Bent Radio Jet in the Merging Cluster A514

Discovery of A Large-scale Bent Radio Jet in the Merging Cluster A514

Searching for Bulk Motions in the Intracluster Medium of Massive, Merging Clusters With Chandra CCD Data

CHANDRA X-Ray Observations of A119: Cold Fronts and a Shock in an Evolved Off-axis Merger

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