Zobrazeno 1 - 10
of 1 093
pro vyhledávání: '"Ferland G"'
The radiative cooling time of hot gas in the cool cores of many galaxy clusters and massive elliptical galaxies drops in the centre to below 100 million years. The mass cooling rates inferred from simple modelling of X-ray observations of these objec
Externí odkaz:
http://arxiv.org/abs/2411.03864
Autor:
Fabian, A. C., Ferland, G. J., Sanders, J. S., Russell, H. R., McNamara, B. R., Pinto, C., Hlavacek-Larrondo, J., Walker, S. A., Ivey, L. R., McDonald, M.
Cooling flows are common in galaxy clusters which have cool cores. The soft X-ray emission below 1 keV from the flows is mostly absorbed by cold dusty gas within the central cooling sites. Further evidence for this process is presented here through a
Externí odkaz:
http://arxiv.org/abs/2410.10675
High resolution X-ray spectra reveal hidden cooling flows depositing cold gas at the centres of massive nearby early-type galaxies with little sign of normal star formation. Optical observations are revealing that a bottom-heavy Initial Mass Function
Externí odkaz:
http://arxiv.org/abs/2405.01865
Autor:
Mitchell, J. A. J., Ward, M. J., Kynoch, D., Santisteban, J. V. Hernández, Horne, K., Pott, J. -U., Esser, J., Mercatoris, P., Packham, C., Ferland, G. J., Lawrence, A., Fischer, T., Barth, A. J., Villforth, C., Winkler, H.
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 529, Issue 4, April 2024, Pages 4824 - 4839
Near IR spectroscopic reverberation of Active Galactic Nuclei (AGN) potentially allows the infrared (IR) broad line region (BLR) to be reverberated alongside the disc and dust continua, while the spectra can also reveal details of dust astro-chemistr
Externí odkaz:
http://arxiv.org/abs/2404.06930
Autor:
Rose, Tom, McNamara, B. R., Combes, F., Edge, A. C., McDonald, M., O'Sullivan, Ewan, Russell, H., Fabian, A. C., Ferland, G., Salome, P., Tremblay, G.
We present new ALMA observations of CO, CN, CS, HCN and HCO$^{+}$ absorption seen against the bright and compact radio continuum sources of eight massive galaxies. Combined with archival observations, they reveal two distinct populations of molecular
Externí odkaz:
http://arxiv.org/abs/2403.03974
Autor:
Riley, D., Singh, R. L., White, S, Charlwood, M., Bailie, D., Hyland, C., Audet, T., Sarri, G., Kettle, B., Gribakin, G., Rose, S. J., Hill, E. G., Ferland, G. J., Williams, R. J. R., Keenan, F. P.
We describe laboratory experiments to generate X-ray photoionized plasmas of relevance to accretion-powered X-ray sources such as neutron star binaries and quasars, with significant improvements over previous work. A key quantity is referenced, namel
Externí odkaz:
http://arxiv.org/abs/2309.07267
Recently, we have uncovered Hidden Cooling Flows (HCF) in the X-ray spectra of the central Brightest Galaxies of 11 clusters, 1 group and 2 elliptical galaxies. Here we report such flows in a further 15 objects, consisting of 8 clusters, 3 groups, 3
Externí odkaz:
http://arxiv.org/abs/2306.11077
We have recently uncovered Hidden Cooling Flows (HCFs) in the XMM RGS spectra of 3 clusters of galaxies, Centaurus, Perseus and A1835. Here we search for them in a wider sample of objects: the X-ray brightest group NGC5044; 4 moderate X-ray luminosit
Externí odkaz:
http://arxiv.org/abs/2211.13971
Examination of emission lines in high-velocity resolution optical spectra of the Orion Nebula confirms that the velocity component on the red wing of the main ionization front emission line is due to backscattering in the Photon Dominated Region. Thi
Externí odkaz:
http://arxiv.org/abs/2211.00159
Autor:
Rose, Tom, McNamara, B. R., Combes, F., Edge, A. C., Fabian, A. C., Gaspari, M., Russell, H., Salomé, P., Tremblay, G., Ferland, G.
Galaxies often contain large reservoirs of molecular gas which shape their evolution. This can be through cooling of the gas -- which leads to star formation, or accretion onto the central supermassive black hole -- which fuels AGN activity and produ
Externí odkaz:
http://arxiv.org/abs/2210.14922