Results 31 to 40 of about 1,208,682 (349)

The contribution of AGN to the sub-mm population [PDF]

, 2010
We find that X-ray sources in the Extended Chandra Deep Field South are strongly spatially correlated with LABOCA 870 micron sources. We investigate the dependence of this correlation on X-ray flux, hardness ratio and column density, finding that ...
Aird, Alexander, Almaini, Almaini, Andreani, Andreani, Antonucci, Barger, Barger, Bauer, Blain, Borys, Borys, Busswell, Chapman, Chini, Coppin, Coppin, Coppin, Coppin, Dickinson, Dunne, Elbaz, Fabian, Fixsen, Gawiser, Giacconi, Gilli, Granato, Güsten, Holland, Hughes, Hughes, Knudsen, Kuraszkiewicz, Lehmer, Lonsdale, Lutz, Lutz, Martínez-Sansigre, McMahon, Menéndez-Delmestre, Metcalfe, Metcalfe, Michael D. Hill, Omont, Omont, Omont, Page, Page, Petric, Pope, Priddey, Priddey, Puget, Reddy, Rieke, Sanders, Scott, Scott, Siringo, Smail, Smail, Stern, Tom Shanks, Tozzi, Treister, Weiß, Worsley   +68 more
core   +1 more source

Altered chemistry of oxygen and iron under deep Earth conditions

Nature Communications, 2019
Iron oxides prevail in the deep Earth, at extreme pressures and temperatures, with different stoichiometries than in ambient conditions. Here, high-pressure synchrotron X-ray spectroscopic measurements reveal the oxidation states of Fe and O in iron ...
Jin Liu, Qingyang Hu, Wenli Bi, Liuxiang Yang, Yuming Xiao, Paul Chow, Yue Meng, Vitali B. Prakapenka, Ho-Kwang Mao, Wendy L. Mao   +9 more
doaj   +1 more source

Galactic Centre X‐ray Sources [PDF]

AIP Conference Proceedings, 2007
4 pages, 3 figures; Poster to appear in AIP Conf. Proc.: `The Multicoloured Landscape of Compact Objects and their Explosive Origins'; Cefalu, Sicily, 2006 June 11 ...
Gosling, A, Bandyopadhyay, R, Blundell, K   +2 more
openaire   +3 more sources

X-ray observations of ultraluminous X-ray sources [PDF]

Astrophysics and Space Science, 2007
Invited talk at the 5th Stromlo Symposium. 10 pages, 4 figures.
openaire   +4 more sources

X-ray and Optical Study of Low Core Density Globular Clusters NGC6144 and E3 [PDF]

, 2009
We report on the Chandra X-ray Observatory and Hubble Space Telescope observation of two low core density globular clusters, NGC6144 and E3. By comparing the number of X-ray sources inside the half-mass radius to those outside, we found 6 X-ray sources ...
Albert K. H. Kong, Alcaino, Bassa, Cees Bassa, Cool, Cool, David Pooley, Davies, Frank Verbunt, Freeman, Giacconi, Green, Grindlay, Grindlay, Heinke, Heinke, Hills, Kong, Lu, Pooley, Pooley, Pooley, Pryor, Sarajedini, Scott F. Anderson, Shih-Hao Lan, Verbunt, Verbunt, Verbunt, Verbunt, Walter H. G. Lewin, Wijnands   +31 more
core   +2 more sources

Luminous supersoft X-ray sources [PDF]

Astronomy & Astrophysics, 2004
We discuss possible evolution channels that lead to the formation of luminous supersoft X-ray sources, subclasses of which may be progenitors of type Ia supernovae. We carry out full evolution calculations from the zero-age main sequence to the supersoft source.
Bitzaraki, O.M., Rovithis-Livaniou, H., Tout, C.A., van den Heuvel, E.P.J.   +3 more
openaire   +4 more sources

Near-Infrared Counterparts to Chandra X-ray Sources toward the Galactic Center. I. Statistics and a Catalog of Candidates [PDF]

, 2009
We present a catalog of 5184 candidate infrared counterparts to X-ray sources detected towards the Galactic center. The X-ray sample contains 9017 point sources detected in this region by the Chandra X-ray Observatory, including data from a recent deep ...
Bauer, Franz E., Mauerhan, Jon C., Morris, Mark R., Muno, Michael P., Nagata, Tetsuya, Nishiyama, Shogo   +5 more
core   +2 more sources

SPICES II. Optical and Near-Infrared Identifications of Faint X-Ray Sources from Deep Chandra Observations of Lynx [PDF]

, 2002
We present our first results on field X-ray sources detected in a deep, 184.7 ks observation with the ACIS-I camera on Chandra. The observations target the Lynx field of SPICES, and contains three known X-ray-emitting clusters out to z=1.27.
Chaffee, Frederic H., Connolly, Andrew, Dawson, Steve, Dey, Arjun, Eisenhardt, Peter, Elston, Richard, Holden, Brad, Rosati, Piero, Spinrad, Hyron, Stanford, S. A., Stern, Daniel, Tozzi, Paolo, Wu, K. L.   +12 more
core   +2 more sources

X-ray reflection in a sample of X-ray bright Ultraluminous X-ray sources

, 2009
We apply a reflection-based model to the best available XMM-Newton spectra of X-ray bright UltraLuminous X-ray (ULX) sources (NGC 1313 X-1, NGC 1313 X-2, M 81 X-6, Holmberg IX X-1, NGC 5408 X-1 and Holmberg II X-1).
A. C. Fabian, Abolmasov, Arnaud, Blandford, Brenneman, Brown, Cackett, Colbert, Dewangan, Dickey, Fabbiano, Fabbiano, Fabian, Feng, Fryer, Fryer, George, Gladstone, Goad, Guilbert, Hadfield, Kaaret, Karachentsev, King, Kubota, Laor, Li, Liu, M. D. Caballero-García, Makishima, Mapelli, Miller, Miller, Miller, Miller, Miniutti, Miyawaki, Nandra, Paczynski, Pakull, Pakull, Reis, Reis, Remillard, Roberts, Roberts, Ross, Soria, Stobbart, Strohmayer, Tanaka, Ueda, Winter   +52 more
core   +1 more source

The BeppoSAX High Energy Large Area Survey. IV. On the soft X-ray properties of the hard X-ray-selected HELLAS sources [PDF]

, 2001
We present a comprehensive study of the soft X-ray properties of the BeppoSAX High-Energy Large Area Survey (HELLAS) sources. A large fraction (about 2/3) of the hard X-ray selected sources is detected by ROSAT.
A. Comastri, Akiyama, Barger, Boyle, Brandt, C. Vignali, Comastri, Della Ceca, Della Ceca, Dickey, F. Fiore, F. La Franca, Fiore, Fiore, Gendreau, Gilli, Giommi, Giommi, Hasinger, Hasinger, Hasinger, Lehmann, Madau, Mushotzky, Nandra, Ohta, Piccinotti, Schmidt, Setti, Shanks, Taniguchi, Ueda, Vecchi, Vignali, Voges, White   +35 more
core   +3 more sources