Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Wu, Kinwah"'
We investigate the structure of dynamics of large self-gravitating astrophysical systems using a self-interacting two-component model. We consider two cases, galaxy clusters and cosmic walls, for illustrations. In both cases stability analyses are co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b043e1c5c0ee24e7862d52cc5ea0428a
http://arxiv.org/abs/0811.2058
http://arxiv.org/abs/0811.2058
We present a convariant formulation for radiative transfer in curved space time and demonstrate some applications in the black-hole systems. We calculate the emission from semi-transparent accretion tori around black holes, for opacity provided by th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::14f75118380930b423f3dac8a8fabe9c
http://arxiv.org/abs/0811.2060
http://arxiv.org/abs/0811.2060
This is a call for amateur astronomers who have the equipment and experience for producing high quality photometry to contribute to a program of finding periods in the optical light curves of high mass X-ray binaries (HMXB). HMXBs are binary stars in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ea416a8b99be9ba52e7171c8e2fa3180
http://arxiv.org/abs/astro-ph/0702248
http://arxiv.org/abs/astro-ph/0702248
A standard disk around an accreting black hole may become effectively optically-thin and scattering dominated in the inner region, for high accretion rates (as already predicted by the Shakura-Sunyaev model). Radiative emission from that region is le
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8d1a21019aedc80d5ca859d40267fe8c
We have constructed a model to describe the optical emission from ultra-luminous X-ray sources (ULXs). We assume a binary model with a black hole accreting matter from a Roche lobe filling companion star. We consider the effects of radiative transpor
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c47a487fc7a7418cf10a625af606384f
We have studied the candidate optical counterparts and the stellar population in the star-forming complex around a bright ULX in NGC4559, using HST/WFPC2, XMM-Newton/OM, and ground-based data. We find that the ULX is located near a small group of OB
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8f235524a89a72ed04a8b6d41f67b291
Autor:
Soria, Roberto, Wu, Kinwah
We have studied the face-on, barred spiral M83 (NGC 5236) with Chandra. Eighty-one point sources are detected (above 3.5-sigma) in the ACIS S3 image: 15 of them are within the inner 16 arcsec region (starburst nucleus, resolved for the first time wit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f6d1556127f857809016a7488ae4583f
http://arxiv.org/abs/astro-ph/0202014
http://arxiv.org/abs/astro-ph/0202014
We carried out a multiwavelenght study of the black-hole candidate LMC X-3 with XMM-Newton. The system showed a transition to a low-hard state, in which the X-ray spectrum was well fitted by a simple power law. It then returned to a high-soft state,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::212a15dc316f5bc60e03e83f133a3626
The 1998 outburst of XTE J1550-564 started with a hard X-ray spike, rising in less than a day and declining after 3-4 days; at the same time, the soft X-ray flux was rising with a longer timescale (~ 10 days). We suggest that the soft and the initial
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c93732bec2fbc78793de042236577225
http://arxiv.org/abs/astro-ph/0108084
http://arxiv.org/abs/astro-ph/0108084
Autor:
Tennant, Allyn F., Wu, Kinwah, Ghosh, Kajal K., Kolodziejczak, Jeffery J., Swartz, Douglas A.
The Chandra X-ray Observatory obtained a 50-ks observation of the central region of M81 using the ACIS-S in imaging mode. The global properties of the 97 x-ray sources detected in the inner 8.3x8.3 arcmin field of M81 are examined. Roughly half the s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c10c1f8565c5cf6aa992e06e8b01fe2f