Zobrazeno 1 - 10
of 272
pro vyhledávání: '"Mathews, William G."'
Autor:
Snios, Bradford, Nulsen, Paul E. J., Wise, Michael W., de Vries, Martijn, Birkinshaw, Mark, Worrall, Diana M., Duffy, Ryan T., Kraft, Ralph P., McNamara, Brian R., Carilli, Chris, Croston, Judith H., Edge, Alastair C., Godfrey, Leith E. H., Hardcastle, Martin J., Harris, Daniel E., Laing, Robert A., Mathews, William G., McKean, John P., Perley, Richard A., Rafferty, David A., Young, Andrew J.
We use 2.0 Msec of Chandra observations to investigate the cocoon shocks of Cygnus A and some implications for its lobes and jet. Measured shock Mach numbers vary in the range 1.18-1.66 around the cocoon. We estimate a total outburst energy of $\sime
Externí odkaz:
http://arxiv.org/abs/1802.10106
Autor:
Temi, Pasquale, Amblard, Alexandre, Gitti, Myriam, Brighenti, Fabrizio, Gaspari, Massimo, Mathews, William G., David, Laurence
We present new ALMA CO(2--1) observations of two well studied group-centered elliptical galaxies: NGC~4636 and NGC~5846. In addition, we include a revised analysis of Cycle 0 ALMA observations of the central galaxy in the NGC~5044 group that has been
Externí odkaz:
http://arxiv.org/abs/1711.10630
OVI absorption in quasar spectra caused by intervening circumgalactic atmospheres suggests a downturn in the atmospheric column density in sightlines passing beyond about 100 kpc from central star-forming galaxies. This turnover supports the hypothes
Externí odkaz:
http://arxiv.org/abs/1708.07140
Expanding X-ray cavities observed in hot gas atmospheres of many galaxy groups and clusters generate shock waves and turbulence that are primary heating mechanisms required to avoid uninhibited radiatively cooling flows which are not observed. Howeve
Externí odkaz:
http://arxiv.org/abs/1501.07647
Autor:
Mathews, William G.
Cosmic rays, thermal gas and magnetic fields in FRII radio cavities are assumed to come entirely from winds flowing from just behind the jet shocks. Combining analytic and computational methods, it is shown that the computed radio-electron energy dis
Externí odkaz:
http://arxiv.org/abs/1402.0853
Autor:
Guo, Fulai, Mathews, William G.
Feedback heating from active galactic nuclei (AGNs) has been commonly invoked to suppress cooling flows predicted in hot gas in elliptical galaxies, galaxy groups and clusters. Previous studies have focused on if and how AGN feedback heats the gas, b
Externí odkaz:
http://arxiv.org/abs/1305.2958
The Hubble morphological sequence from early to late galaxies corresponds to an increasing rate of specific star formation. The Hubble sequence also follows a banana-shaped correlation between 24 and 70 micron luminosities, both normalized with the K
Externí odkaz:
http://arxiv.org/abs/1303.3350
Autor:
Mathews, William G., Guo, Fulai
We describe approximate axisymmetric computations of the dynamical evolution of material inside radio lobes and X-ray cluster gas cavities in Fanaroff-Riley II sources such as Cygnus A. All energy is delivered by a jet to the lobe/cavity via a moving
Externí odkaz:
http://arxiv.org/abs/1206.4997
Autor:
Mathews, William G., Guo, Fulai
Steady accretion of a radiating gas onto a central mass point is described and compared to classic Bondi accretion. Radiation losses are essential for accretion flows to be observed. Unlike Bondi flows, radiating Bondi flows pass through a sonic poin
Externí odkaz:
http://arxiv.org/abs/1206.4585
Autor:
Humphrey, Philip J., Buote, David A., Brighenti, Fabrizio, Gebhardt, Karl, Mathews, William G.
Recent hydrostatic X-ray studies of the hot interstellar medium (ISM) in early-type galaxies underestimate the gravitating mass as compared to stellar dynamics, implying modest, but significant deviations from exact hydrostatic equilibrium. We presen
Externí odkaz:
http://arxiv.org/abs/1205.0256