The Complex X-Ray Morphology of NGC 7618: A Major Group-Group Merger in the Local Universe?

@article{Kraft2006TheCX,
  title={The Complex X-Ray Morphology of NGC 7618: A Major Group-Group Merger in the Local Universe?},
  author={Ralph P. Kraft and C. Jones and P. E. J. Nulsen and Martin J. Hardcastle},
  journal={The Astrophysical Journal},
  year={2006},
  volume={640},
  pages={762-767}
}
We present results from a short Chandra ACIS-S observation of NGC 7618, the dominant central galaxy of a nearby (z = 0.017309, d = 74.1 Mpc) group. We detect a sharp surface brightness discontinuity 14.4 kpc north of the nucleus subtending an angle of 130° with an X-ray tail extending ~70 kpc in the opposite direction. The temperature of the gas inside and outside the discontinuity is 0.79 ± 0.03 and 0.81 ± 0.07 keV, respectively. There is marginal evidence for a discontinuous change in the… 

Figures and Tables from this paper

Revealing a Head-on Major Merger in the Nearby NGC 6338 Group with Chandra and VLA Observations
By analyzing the Chandra archival data of the nearby NGC 6338 galaxy group, we identify two X-ray bright clumps (N-clump and S-clump) within the central 100 kpc, and detect an arc-like X-ray
On the Anomalous Temperature Distribution of the Intergalactic Medium in the NGC 3411 Group of Galaxies
We present XMM-Newton, Chandra, and VLA observations of the USGC S152 group and its central elliptical NGC 3411. Imaging of the group X-ray halo suggests that it is relaxed with little apparent
THE GAS DYNAMICS OF NGC 4472 REVEALED BY XMM-NEWTON
We present results from a 100 ks XMM-Newton observation of the hot gas in the Virgo cluster elliptical galaxy NGC 4472. We find a surface brightness discontinuity {approx}21 kpc north of the nucleus,
The bow shock, cold fronts and disintegrating cool core in the merging galaxy group RX J0751.3+5012
We present a new Chandra X-ray observation of the off-axis galaxy group merger RX J0751.3+5012. The hot atmospheres of the two colliding groups appear highly distorted by the merger. The images
Building a cluster: shocks, cavities, and cooling filaments in the group–group merger NGC 6338
We present deep Chandra, XMM–Newton, Giant Metrewave Radio Telescope, and Hα observations of the group–group merger NGC 6338. X-ray imaging and spectral mapping show that as well as trailing tails
The Unusually Weak and Exceptionally Steep Radio Relic in A2108
Mergers between galaxy clusters often drive shocks into the intracluster medium, the effects of which are sometimes visible via temperature and density jumps in the X-ray and via radio emission from
MeerKAT-64 discovers wide-spread tidal debris in the nearby NGC 7232 galaxy group
We report the discovery of large amounts of previously undetected cold neutral atomic hydrogen (H i) around the core triplet galaxies in the nearby NGC 7232 galaxy group withMeerKAT. With a physical
The hot interstellar medium in normal elliptical galaxies
This is the third paper in a series analyzing X-ray emission from the hot interstellar medium in a sample of 54 normal elliptical galaxies observed by Chandra. We focus on a subset of 36 galaxies
Gas sloshing, cold fronts, Kelvin–Helmholtz instabilities and the merger history of the cluster of galaxies Abell 496
We investigate the origin and nature of the multiple sloshing cold fronts in the core of Abell 496 by direct comparison between observations and dedicated hydrodynamical simulations. Our simulations
Temperature profiles of hot gas in early-type galaxies
Using the data products of the Chandra Galaxy Atlas (Kim et al. 2019a), we have investigated the radial profiles of the hot gas temperature in 60 early type galaxies. Considering the characteristic
...
...

References

SHOWING 1-10 OF 28 REFERENCES
An Unusual Discontinuity in the X-Ray Surface Brightness Profile of NGC 507: Evidence of an Abundance Gradient?
We present results from a 45 ks Chandra ACIS-I observation of the nearby (z = 0.01646) NGC 507 group. The X-ray surface brightness profile of the outer region of the group is well described by an
ROSAT PSPC observations of the early-type galaxies NGC 507 and NGC 499: Central cooling and mass determination
We present the results of a deep observation of NGC 507 and NGC 499 with the ROSAT Position Sensitive Proportional Counter (PSPC). The X-ray emission of NGC 507 is extended at least out to 1000 sec
Hot gas structure in the elliptical galaxy NGC 4472
We present X-ray spectroscopic and morphological analyses using Chandra ACIS and ROSAT observations of the giant elliptical galaxy NGC 4472 in the Virgo Cluster. We discuss previously unobserved
Chandra Observation of RX J1720.1+2638: a Nearly Relaxed Cluster with a Fast-moving Core?
We have analyzed the Chandra observation of the distant (z = 0.164) galaxy cluster RX J1720.1+2638, in which we find sharp features in the X-ray surface brightness on opposite sides of the X-ray
Infall of the Elliptical Galaxy NGC 1404 into the Fornax Cluster
We use three Chandra observations, totaling 134.3 ks, to constrain the dynamical motion of NGC 1404 falling toward the dominant elliptical NGC 1399 through the Fornax Cluster gas. The surface
Chandra X-Ray Observations of the Hydra A Cluster: An Interaction between the Radio Source and the X-Ray-emitting Gas.
TLDR
Ch Chandra X-ray observations of the Hydra A cluster of galaxies are presented, and the discovery of structure in the central 80 kpc of the cluster's X-Ray-emitting gas is reported, suggesting that the gas within the surface brightness depressions was displaced as the radio lobes expanded subsonically, leaving cavities in the hot atmosphere.
A Moving Cold Front in the Intergalactic Medium of A3667
We present results from a Chandra observation of the central region of the galaxy cluster A3667 with emphasis on the prominent sharp X-ray brightness edge spanning 0.5 Mpc near the cluster core. Our
WIDE-FIELD X-RAY TEMPERATURE, PRESSURE, AND ENTROPY MAPS OF A754
We present a mosaic of XMM-Newton observations of the nearby major-merger cluster A754 that has either a wider field or better spectral or spatial resolution than previous observations. We construct
A Systematic X-Ray Search for Clusters of Galaxies behind the Milky Way*
We report on the design and status of the Clusters in the Zone of Avoidance (CIZA) project, the first systematic X-ray search for clusters of galaxies behind the Milky Way. We demonstrate that an
XMM-Newton EPIC observation of the galaxy cluster A 3667
The Abell cluster of galaxies A 3667 was observed with XMM-Newton in 6 partially overlapping pointings. We present here the resulting X-ray surface brightness, temperature, entropy and pressure maps
...
...