A Survey of Extended Radio Jets withChandraand theHubble Space Telescope

2004 ◽  
Vol 608 (2) ◽  
pp. 698-720 ◽  
Author(s):  
Rita M. Sambruna ◽  
Jessica K. Gambill ◽  
L. Maraschi ◽  
F. Tavecchio ◽  
R. Cerutti ◽  
...  
Keyword(s):  
Space Telescope ◽  
Radio Jets ◽  
Extended Radio

scholarly journals A Survey of Extended Radio Jets in Active Galactic Nuclei withChandraand theHubble Space Telescope: First Results

2002 ◽  
Vol 571 (1) ◽  
pp. 206-217 ◽  
Author(s):  
Rita M. Sambruna ◽  
L. Maraschi ◽  
F. Tavecchio ◽  
C. Megan Urry ◽  
C. C. Cheung ◽  
...  
Keyword(s):  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Space Telescope ◽  
Radio Jets ◽  
Extended Radio ◽  
First Results

scholarly journals Hubble Space Telescope Observations of Extragalactic Jets

1996 ◽  
Vol 175 ◽  
pp. 195-200 ◽  
Author(s):  
F. Duccio Macchetto
Keyword(s):  
Hubble Space Telescope ◽  
Space Telescope ◽  
Central Source ◽  
Radio Jets ◽  
Extended Radio ◽  
Extragalactic Jets ◽  
The Subject ◽  
Radio Band ◽  
Better Than

The study of the optical counterparts to the radio jets has been the subject of a number of observing programs with the Hubble Space Telescope (HST). We know that these jets play a fundamental role in transporting energy from the central source to the extended radio lobes. Observations at optical and ultraviolet wavelengths with the HST are essential to obtain spatial resolutions similar to, or better than, those achieved in the radio band and, thus, provide the possibility of directly comparing the sites and mechanisms responsible for the emission at these different wavelengths.

scholarly journals Nonthermal processes in microquasars

2010 ◽  
Vol 6 (S275) ◽  
pp. 215-223
Author(s):  
Valentí Bosch-Ramon
Keyword(s):  
Thermal Emission ◽  
High Energy ◽  
Energy Bands ◽  
X Ray ◽  
Radio Jets ◽  
Extended Radio ◽  
Very High Energy ◽  
X Ray Binaries ◽  
Very High ◽  
Negligible Contribution

AbstractMicroquasars are X-ray binaries that show extended radio jets. These jets can accelerate particles up to relativistic energies that produce non-thermal emission from radio to TeV, and could also make a non-negligible contribution to the galactic CRs in some energy ranges. The orbital motion and compactness of these sources allow the study of high-energy astrophysical phenomena in extreme conditions that change in accessible timescales. In this work, I briefly discuss the production of broadband non-thermal emission in microquasars, putting special emphasis on the high- and the very high-energy bands.

scholarly journals Optical Observations of Radio Jets

1980 ◽  
Vol 5 ◽  
pp. 671-675
Author(s):  
Wil van Breugel ◽  
George Miley ◽  
Harvey R. Butcher
Keyword(s):  
Energy Transport ◽  
Optical Observations ◽  
Radio Sources ◽  
Optical Counterpart ◽  
Radio Structure ◽  
The Past ◽  
Radio Jets ◽  
Extended Radio ◽  
Considerable Body ◽  
Good Agreement

Over the past several years a considerable body of evidence has accumulated, suggesting that extended radio sources are powered quasi-continuously from the nuclei of their parent galaxies. This view is supported by the recent discovery that several radio galaxies have narrow radio jets which connect their active nuclei with the large radio lobes and which often extend for several tens of kiloparsecs. Because of their presumed association with the energy transport outward from the active nuclei, radio jets are at present being intensively studied with high-resolution radio techniques.The closest galaxy known to have a radio jet is the giant elliptical M87 (e.g., Wilkinson 1974), and in this case there is a well-known optical counterpart (e.g., Curtis 1918; de Vaucouleurs, Angione and Fraser 1968), This optical jet is highly polarized (Baade 1956), implying that at least part of the emission is non-thermal. This and the good agreement between the optical and radio structure suggests that these features are closely related.

scholarly journals Discovery of radio jets in the Phoenix galaxy cluster center

2020 ◽  
Vol 72 (4) ◽  
Author(s):  
Takuya Akahori ◽  
Tetsu Kitayama ◽  
Shutaro Ueda ◽  
Takuma Izumi ◽  
Kianhong Lee ◽  
...  
Keyword(s):  
Radio Emission ◽  
Dust Emission ◽  
Galaxy Cluster ◽  
Cluster Center ◽  
Cluster Galaxy ◽  
Cooling Flow ◽  
Radio Jets ◽  
Spatially Resolved ◽  
Extended Radio ◽  
The Phoenix

Abstract We report the results of the Australia Telescope Compact Array (ATCA) 15 mm observation of the Phoenix galaxy cluster possessing an extreme star-burst brightest cluster galaxy (BCG) at the cluster center. We spatially resolved radio emission around the BCG, and found diffuse bipolar and bar-shape structures extending from the active galactic nucleus (AGN) of the BCG. They are likely radio jets/lobes, whose sizes are ∼10–20 kpc and locations are aligned with X-ray cavities. If we assume that the radio jets/lobes expand with the sound velocity, their ages are estimated to be ∼10 Myr. We also found compact radio emissions near the center and suggest that they are more young bipolar jets ∼1 Myr in age. Moreover, we found extended radio emission surrounding the AGN and discussed the possibility that the component is a product of the cooling flow, by considering synchrotron radiation partially absorbed by molecular clumps, free–free emission from the warm ionized gas, and the spinning dust emission from the dusty circumgalactic medium.

scholarly journals Weak Radio Galaxies: Narrow-Band Optical Imaging

1996 ◽  
Vol 175 ◽  
pp. 236-237
Author(s):  
René Carrillo ◽  
Irene Cruz-González
Keyword(s):  
Emission Line ◽  
Narrow Band ◽  
Radio Galaxies ◽  
Convincing Evidence ◽  
Host Galaxy ◽  
Ultraviolet Continuum ◽  
Physical Relationship ◽  
Radio Jets ◽  
Extended Radio ◽  
Extended Emission

Previous studies show that: a) radio galaxies and radio-loud quasars have emission-line gas (ELG) which is extended on scales of tenths of kiloparsecs; b) there is convincing evidence that the kinematics and excitation of the very extended emission-line gas is governed by its interaction with the outflowing radio plasma; c) the evidence for an interaction is weaker in some radio galaxies. It is argued that the ionization of the ELG may be predominantly produced by the nuclear ultraviolet continuum and the kinematics of the gas due to the gravitational potential of the host galaxy, but it is not yet known whether there is a physical relationship between the ELG and the extended radio jets.

scholarly journals A molecular absorption line survey towards the AGN of Hydra-A

2020 ◽  
Vol 496 (1) ◽  
pp. 364-380
Author(s):  
Tom Rose ◽  
A C Edge ◽  
F Combes ◽  
S Hamer ◽  
B R McNamara ◽  
...  
Keyword(s):  
Elliptical Galaxy ◽  
Cluster Galaxy ◽  
Cluster Galaxies ◽  
Continuum Source ◽  
Radio Jets ◽  
Extended Radio ◽  
Brightest Cluster Galaxies ◽  
The Galaxy ◽  
Absorption Features ◽  
Recession Velocity

ABSTRACT We present Atacama Large Millimetre/submillimetre Array observations of the brightest cluster galaxy Hydra-A, a nearby (z = 0.054) giant elliptical galaxy with powerful and extended radio jets. The observations reveal CO(1−0), CO(2–1), 13CO(2–1), CN(2–1), SiO(5–4), HCO+(1–0), HCO+(2–1), HCN(1–0), HCN(2–1), HNC(1–0), and H2CO(3–2) absorption lines against the galaxy’s bright and compact active galactic nucleus. These absorption features are due to at least 12 individual molecular clouds that lie close to the centre of the galaxy and have velocities of approximately −50 to +10 km s−1 relative to its recession velocity, where positive values correspond to inward motion. The absorption profiles are evidence of a clumpy interstellar medium within brightest cluster galaxies composed of clouds with similar column densities, velocity dispersions, and excitation temperatures to those found at radii of several kpc in the Milky Way. We also show potential variation in a ∼10 km s−1 wide section of the absorption profile over a 2 yr time-scale, most likely caused by relativistic motions in the hot spots of the continuum source that change the background illumination of the absorbing clouds.

scholarly journals Active Galaxies and Candidate Remnants in the Core of the Shapley Concentration

2002 ◽  
Vol 199 ◽  
pp. 161-162
Author(s):  
T. Venturi ◽  
S. Bardelli ◽  
D. Dallacasa ◽  
R.W. Hunstead ◽  
R. Morganti ◽  
...  
Keyword(s):  
Spectral Properties ◽  
Radio Galaxies ◽  
Active Galaxies ◽  
Radio Sources ◽  
Nuclear Activity ◽  
The Core ◽  
Radio Jets ◽  
Extended Radio ◽  
Cluster Mergers ◽  
Compact Array

We present preliminary results of a multifrequency and multiresolution study carried out with the Australia Telescope Compact Array for nine of the ten extended radio galaxies located in the merging cluster complexes A3558 and A3528, at the centre of the Shapley Concentration. We found that 5 out of the 9 extended radio galaxies are active radio galaxies, i.e. they have a clear active radio nucleus coincident with the central region of the associated optical galaxy, radio jets and extended lobes; the remaining four lack an obvious radio nucleus, have a very diffuse and amorphous morphology and exhibit peculiar spectral properties. We call these radio sources as remnants and propose that they are (a) either radio galaxies where the nuclear activity has ceased; or (b) regions where pre-existing electrons have been reaccelerated as consequence of shocks due to cluster mergers.

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