Zobrazeno 1 - 10
of 40
pro vyhledávání: '"Dasgupta, Surajit"'
Autor:
Dasgupta, Surajit
Investigation of infiltration provides insights about the flow of water and transport of contaminants through the vadose zone. Infiltration is governed by prevailing environmental conditions like soil characteristics, plant cover and geologic setting
Externí odkaz:
http://hdl.handle.net/1969.1/2387
Autor:
Dasgupta, Surajit, 1976
Thesis (M. S.)--Texas A&M University, 2005.
"Major Subject: Rangeland Ecology and Management" Title from author supplied metadata (automated record created on Sep. 21, 2005.) Vita. Abstract. Includes bibliographical references.
"Major Subject: Rangeland Ecology and Management" Title from author supplied metadata (automated record created on Sep. 21, 2005.) Vita. Abstract. Includes bibliographical references.
Externí odkaz:
http://handle.tamu.edu/1969.1/2387
The origin of soft X-ray excess emission from type 1 active galactic nuclei has remained a major problem for the last two decades. It has not been possible to distinguish alternative models for the soft excess emission despite the excellent data qual
Externí odkaz:
http://arxiv.org/abs/0709.1969
We investigate the origin of the soft X-ray excess emission from narrow-line Seyfert 1 galaxies Akn564 and Mrk1044 using XMM-Newton observations. We find clear evidence for time delays between the soft and hard X-ray emission from Akn564 based on a 1
Externí odkaz:
http://arxiv.org/abs/0709.1962
Autor:
Dasgupta, Surajit, Rao, A. R.
Publikováno v:
Astrophys.J.651:L13-L16,2006
We report the discovery of hard X-ray delays in the X-ray emission of the Seyfert 1 galaxy Mrk 110, based on a long XMM-Newton observation. Cross correlation between the X-ray light curves of different energy bands reveals an energy dependent delay r
Externí odkaz:
http://arxiv.org/abs/astro-ph/0609346
Publikováno v:
JCAP 0706:009,2007
We formulate and solve the equations governing the transonic behaviour of a general relativistic black-hole accretion disc with non-zero advection velocity. We demonstrate that a relativistic Rankine-Hugoniot shock may form leading to the formation o
Externí odkaz:
http://arxiv.org/abs/astro-ph/0604477
Autor:
Choudhury, Manojendu, Rao, A. R., Dasgupta, Surajit, Pendharkar, J., Sriram, K., Agrawal, V. K.
Publikováno v:
Astrophys.J. 631 (2005) 1072-1081
Multi-wavelength observations of Galactic black hole candidate sources indicate a close connection between the accretion disk emission and the jet emission. The recent discovery of an anti-correlated time lag between the soft and hard X-rays in Cygnu
Externí odkaz:
http://arxiv.org/abs/astro-ph/0506325
Publikováno v:
Gen.Rel.Grav. 37 (2005) 1877-1890
We demonstrate that a spherical accretion onto astrophysical black holes, under the influence of Newtonian or various post-Newtonian pseudo-Schwarzschild gravitational potentials, may constitute a concrete example of classical analogue gravity natura
Externí odkaz:
http://arxiv.org/abs/astro-ph/0501410
Publikováno v:
Astrophys.J. 618 (2004) L87-L90
We present the results of an analysis of data from XMM-Newton and CHANDRA observations of the high luminosity narrow-line quasar PG 1404+226. We confirm a strong soft X-ray excess in the X-ray spectrum and we find rapid variability (a factor of two i
Externí odkaz:
http://arxiv.org/abs/astro-ph/0409495
Publikováno v:
Astrophys.J. 614 (2004) 626-633
We present results based on an XMM-Newton observation of the high luminosity narrow-line QSO PHL 1092 performed in 2003 January. The 0.3 - 10 keV spectrum is well described by a model which includes a power-law (Gamma ~ 2.1) and two blackbody compone
Externí odkaz:
http://arxiv.org/abs/astro-ph/0404550