scholarly journals Co-Evolution of Brightest Cluster Galaxies and Galaxy Activity in the Host Clusters

2009 ◽  
Vol 5 (S267) ◽  
pp. 110-110
Author(s):  
Mei-Ling Huang ◽  
Lin-wen Chen
Keyword(s):  
Galaxy Clusters ◽  
Radio Galaxy ◽  
Host Galaxy ◽  
Radio Sources ◽  
Wide Angle ◽  
Cluster Galaxies ◽  
Brightest Cluster Galaxies ◽  
Radio Power

AbstractWe have identified ~500 relatively relaxed galaxy clusters at low redshift (z < 0.3) from the maxBCG catalog with double radio lobes at the center; about 200 radio counterparts of brightest cluster galaxies (BCGs) of these clusters appear to be wide-angle tailed (WAT) radio sources, indicating ongoing interaction between its host galaxy and the surrounding ICM. Our analysis suggests that the radio power of WAT is positively correlated with the optical luminosities of host BCGs, and increases with redshift; whereas the cluster ellipticity-radio galaxy fraction relation shows no obvious difference between WAT and non-WAT clusters.

Wide-angle tailed radio galaxies

1986 ◽  
Vol 64 (4) ◽  
pp. 373-377 ◽  
Author(s):  
Jack O. Burns
Keyword(s):  
Pressure Gradient ◽  
Radio Galaxy ◽  
Dynamic Pressure ◽  
Radio Galaxies ◽  
Radio Sources ◽  
Wide Angle ◽  
Cluster Galaxies ◽  
Moderate Size ◽  
Insight Into ◽  
Radio Power

In this paper, the properties of a class of extragalactic radio sources associated with dominant cluster galaxies known as wide-angle tails (WATs) are reviewed. The mechanism responsible for forming and, in particular, bending these sources remains controversial nearly 10 years after their discovery. To gain possibly new insight into these radio galaxies, we divide them into three subclasses according to linear size. The smallest WATs are limited in size to the optical extent of the galaxies, are weaker in radio power, and may be bent by dynamic pressure as a result of motion of the radio galaxy about a second large galaxy or subcondensation of galaxies in the cluster. The large, 1-Mpc size WATs are associated with a single, dominant cD galaxy, have only sharp and irregularly placed bends in the jets, and probably interact with clouds in the cluster gas. The moderate-size, symmetrically bent WATs such as 3C 465 may bend and decollimate as a result of the passage of a jet through a sharp pressure gradient, which occurs within the halos of these galaxies.

scholarly journals WATCAT: a tale of wide-angle tailed radio galaxies

2019 ◽  
Vol 626 ◽  
pp. A8 ◽  
Author(s):  
V. Missaglia ◽  
F. Massaro ◽  
A. Capetti ◽  
M. Paolillo ◽  
R. P. Kraft ◽  
...  
Keyword(s):  
Radio Galaxies ◽  
Sloan Digital Sky Survey ◽  
Host Galaxy ◽  
Wide Angle ◽  
Host Galaxies ◽  
Very Large Array ◽  
Sky Survey ◽  
Black Hole Masses ◽  
Extended Emission ◽  
Radio Power

We present a catalog of 47 wide-angle tailed radio galaxies (WATs), the WATCAT, mainly built including a radio morphological classification; WATs were selected by combining observations from the National Radio Astronomy Observatory/Very Large Array Sky Survey (NVSS), the Faint Images of the Radio Sky at Twenty-Centimeters (FIRST), and the Sloan Digital Sky Survey (SDSS). We included in the catalog only radio sources showing two-sided jets with two clear “warmspots” (i.e., jet knots as bright as 20% of the nucleus) lying on the opposite side of the radio core, and having classical extended emission resembling a plume beyond them. The catalog is limited to redshifts z ≤ 0.15, and lists only sources with radio emission extended beyond 30 kpc from the host galaxy. We found that host galaxies of WATCAT sources are all luminous (−20.5 ≳ Mr ≳ −23.7), red early-type galaxies with black hole masses in the range 108 ≲ MBH ≲ 109 M⊙. The spectroscopic classification indicates that they are all low-excitation galaxies (LEGs). Comparing WAT multifrequency properties with those of FR I and FR II radio galaxies at the same redshifts, we conclude that WATs show multifrequency properties remarkably similar to FR I radio galaxies, having radio power of typical FR IIs.

scholarly journals What Bends Wide-Angle Tailed Radio Sources?

1982 ◽  
Vol 97 ◽  
pp. 45-46
Author(s):  
Jack O. Burns ◽  
Jean A. Eilek ◽  
Frazer N. Owen
Keyword(s):  
Radio Galaxy ◽  
Radio Sources ◽  
Wide Angle ◽  
Velocity Data ◽  
Cluster Galaxy ◽  
Potential Wells ◽  
X Ray ◽  
Ram Pressure ◽  
The Galaxy ◽  
Cd Galaxies

It has been generally assumed that wide-angle tailed (WAT) sources like 3C465 are formed in a manner similar to that of the more strongly bent U-shaped sources such as NGC 1265, i.e., by ram pressure arising from galaxy motion through a dense intracluster medium (ICM). The WAT sources were thought to be less strongly bent because of the smaller ratio of tail plasma flow momentum flux to galaxy velocity. However, as noted recently by Burns (1981), there is a serious discrepancy between the ram pressure model requirements for bending WATs and the dynamics of the associated radio galaxy. To bend the tails, we calculate that the galaxy must typically move at velocities of 0.7–1×103 km s−1 for distances comparable to the length of the radio tails (∼200 kpc for 3C465). This implied galaxy motion is inconsistent with the nature of the massive cD galaxies generally associated with WATs. Cluster galaxy velocity data, X-ray observations, and recent models suggest that these giant galaxies are nearly at rest at the bottoms of cluster potential wells, at most moving ∼200 km s−1 in an oscillatory motion of small amplitude (<0.3 of a core radius, Malumuth, 1981, private communication). Thus it appears that some other mechanism is responsible for bending WAT sources.

scholarly journals Cool gas in brightest cluster galaxies

2009 ◽  
Vol 5 (H15) ◽  
pp. 279-279
Author(s):  
J. B. R. Oonk ◽  
W. Jaffe ◽  
M. N. Bremer ◽  
N. Hatch
Keyword(s):  
Galaxy Clusters ◽  
Line Emission ◽  
Young Stars ◽  
Molecular Gas ◽  
Strongly Coupled ◽  
Cluster Galaxies ◽  
Gas Phases ◽  
Brightest Cluster Galaxies ◽  
Cool Gas

AbstractGas in galaxy clusters requires re-heating. We study the re-heating of the cool gas phases. Ionized and molecular gas is traced out to 20 kpc and found to be strongly coupled. The observed line emission may in part be explained by excitation due to hot, young stars.

scholarly journals Spectroscopic Evidences for Star Formation in Cooling Flow Galaxies

1996 ◽  
Vol 171 ◽  
pp. 349-349
Author(s):  
N. Cardiel ◽  
J. Gorgas ◽  
A. Aragon-Salamanca
Keyword(s):  
Star Formation ◽  
Galaxy Clusters ◽  
X Ray ◽  
Cluster Galaxies ◽  
Cooling Flows ◽  
Cooling Flow ◽  
Brightest Cluster Galaxies

X-ray observations have led to the conclusion that many galaxy clusters are hosting cooling flows. The brightest cluster galaxies could have accreted masses of the order of 1011–1012M⊙, but is still uncertain what the final fate of the accreted gas may be.

scholarly journals A detection of wobbling brightest cluster galaxies within massive galaxy clusters

2017 ◽  
Vol 472 (2) ◽  
pp. 1972-1980 ◽  
Author(s):  
David Harvey ◽  
F. Courbin ◽  
J. P. Kneib ◽  
Ian G. McCarthy
Keyword(s):  
Galaxy Clusters ◽  
Cluster Galaxies ◽  
Brightest Cluster Galaxies ◽  
Massive Galaxy

scholarly journals Updated catalog of 132,684 galaxy clusters and evolution of brightest cluster galaxies

2012 ◽  
Vol 8 (S295) ◽  
pp. 188-188
Author(s):  
Z. L. Wen ◽  
J. L. Han
Keyword(s):  
Galaxy Clusters ◽  
Redshift Range ◽  
Cluster Galaxies ◽  
Brightest Cluster Galaxies

AbstractWe identified 132,684 clusters in the redshift range of 0.05 < z < 0.8 from SDSS DR8. The spectroscopic redshifts of 52,683 clusters have been included in the catalog using SDSS DR9 data. We found that BCGs are more luminous in richer clusters and at higher redshifts.

scholarly journals The High-Redshift Clusters Occupied by Bent Radio AGN (COBRA) Survey

2015 ◽  
Vol 11 (S319) ◽  
pp. 62-62
Author(s):  
Rachel Paterno-Mahler ◽  
Elizabeth L. Blanton ◽  
Joshua Wing ◽  
M.L.N. Ashby ◽  
Mark Brodwin ◽  
...  
Keyword(s):  
Radio Source ◽  
Galaxy Clusters ◽  
Large Range ◽  
High Redshift ◽  
Cosmic Time ◽  
Optical Data ◽  
Radio Sources ◽  
Cluster Galaxies ◽  
Redshift Galaxy ◽  
Red Sequence

AbstractThe number of confirmed, high-redshift galaxy clusters is very low compared to the number of well-studied clusters nearby. Bent, double-lobed radio sources are frequently found in galaxy clusters, and thus can be used as tracers for efficiently locating high-redshift clusters. Using our Spitzer Snapshot Survey, we have identified approximately 300 potential new clusters with redshifts 0.7 < z < 3. These objects make up the high-redshift portion of the Cluster Occupied by Bent Radio AGN (COBRA) survey. We have created color-magnitude diagrams using infrared and optical data. Using the colors of the radio source host and the red sequence we can estimate redshifts for our clusters, as well as examine the evolution of the cluster galaxies over a large range of cosmic time.

scholarly journals Discovery of Rare Dying Radio Galaxies Using MeerKAT

Galaxies ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 102
Author(s):  
Nadeem Oozeer ◽  
Lawrence Rudnick ◽  
Michael F. Bietenholz ◽  
Tiziana Venturi ◽  
Kenda Knowles ◽  
...  
Keyword(s):  
Active Galactic Nuclei ◽  
Radio Galaxy ◽  
Galaxy Cluster ◽  
Galactic Nuclei ◽  
Radio Galaxies ◽  
Radio Sources ◽  
Central Black Hole ◽  
Massive Galaxies ◽  
Multi Wavelength ◽  
Radio Power

Dying radio galaxies represent a stage of the evolution of active galactic nuclei (AGN), during which the accreting central black hole has switched off and/or falls to such a low level that the plasma outflow can no longer be sustained. When this happens, the radio source undergoes a period of fading, the dying phase, before it disappears completely. We present the study of three potential dying radio sources using the MeerKAT radio telescope: MKT J072851.2-752743, MKT J001940.4-654722, and ACO 548B. The identification as dying radio sources came from the MeerKAT Galaxy Cluster Legacy Survey (MGCLS). We carry out a multi-wavelength analysis of the sources and derive their energetics. The ages of the sources are ∼30–70 Myr, they have magnetic fields of the order of a few μG, and they have relatively low radio power. Their potential optical counterparts are associated with massive galaxies. We show that ACO 548B, previously classified as two peripheral relic radio sources, is a dying radio galaxy. With its good sensitivity and resolution, MeerKAT is an ideal instrument to detect potential dying radio sources, and contribute to the understanding of the evolution of AGN population.

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