On the X-ray spectra of luminous, inhomogeneous accretion flows   总被引：1，自引：0，他引：1  

A. Merloni  J. Malzac  A. C. Fabian  R. R. Ross 《Monthly notices of the Royal Astronomical Society》2006,370(4):1699-1712

  相似文献   

Multiple X-ray reflection from ionized slabs     

R. R. Ross  A. C. Fabian  D. R. Ballantyne 《Monthly notices of the Royal Astronomical Society》2002,336(1):315-318

  相似文献   

Orientation dependency of broad-line widths in quasars and consequences for black hole mass estimation     

Matt J. Jarvis  Ross J. McLure 《Monthly notices of the Royal Astronomical Society》2006,369(1):182-188

We have identified two new galaxies with gas counter-rotation (NGC 1596 and 3203) and have confirmed similar behaviour in another one (NGC 128), this using results from separate studies of the ionized-gas and stellar kinematics of a well-defined sample of 30 edge-on disc galaxies. Gas counter-rotators thus represent 10 ± 5 per cent of our sample, but the fraction climbs to 21 ± 11 per cent when only lenticular (S0) galaxies are considered and to 27 ± 13 per cent for S0 galaxies with detected ionized gas only. Those fractions are consistent with but slightly higher than previous studies. A compilation from well-defined studies of S0 galaxies in the literature yields fractions of 15 ± 4 and 23 ± 5 per cent, respectively. Although mainly based on circumstantial evidence, we argue that the counter-rotating gas originates primarily from minor mergers and tidally induced transfer of material from nearby objects. Assuming isotropic accretion, twice those fractions of objects must have undergone similar processes, underlining the importance of (minor) accretion for galaxy evolution. Applications of gas counter-rotators to barred galaxy dynamics are also discussed.  相似文献   

Intrinsic galaxy alignments from the 2SLAQ and SDSS surveys: luminosity and redshift scalings and implications for weak lensing surveys     

Christopher M. Hirata  Rachel Mandelbaum †  Mustapha Ishak  Uro&#; Seljak  Robert Nichol  Kevin A. Pimbblet  Nicholas P. Ross  David Wake 《Monthly notices of the Royal Astronomical Society》2007,381(3):1197-1218

  相似文献   

Stratospheric ozone: Impact of human activity     

Michael B. McElroy  Ross J. Salawitch 《Planetary and Space Science》1989,37(12):1653-1672

Current knowledge of the chemistry of the stratosphere is reviewed using measurements from the Atmospheric Trace Molecule Spectroscopy (ATMOS) experiment to test the accuracy of our treatment of processes at mid-latitudes, and results from the Airborne Antarctic Ozone Experiment (AAOE) to examine our understanding of processes for the polar environment. It is shown that, except for some difficulties with N₂O₅ and possibly ClNO₃, gas phase models for nitrogen and chlorine species at 30°N in spring are in excellent agreement with the data from ATMOS. Heterogeneous processes may have an influence on the concentrations of NO₂, N₂O₅, HNO₃, and ClNO₃ for the lower stratosphere at 48°S in fall. Comparison of model and observed concentrations of O₃ indicate good agreement at 30°N, with less satisfactory results at 48°S. The discrepancy between the loss rate of O₃ observed over the course of the AAOE mission in 1987 and loss rates calculated using measured concentrations of ClO and BrO is found to be even larger than that reported by Anderson et al. (1989, J. geophys. Res. 94, 11480). There appear to be loss processes for removal of O₃ additional to the HOC1 mechanism proposed by Solomon et al. (1986, Nature 321, 755), the ClO-BrO scheme favored by McElroy et al. (1986, Nature 321, 759), and the ClO dimer mechanism introduced by Molina and Molina (1987, J. phys. Chem. 91, 433). There is little doubt that industrial halocarbons have a significant impact on stratospheric O₃. Controls on emissions more stringent than those defined by the Montreal Protocol will be required if the Antarctic Ozone Hole is not to persist as a permanent feature of the stratosphere.  相似文献   

Race and Physician Location: Trends in Two New Zealand Urban Areas     

J. Ross Barnett 《New Zealand geographer》1978,34(1):2-12

  相似文献   

Theoretical models of planetary nebulae     

L. H. Aller  C. D. Keyes  J. E. Ross  S. J. Czyzak 《Astrophysics and Space Science》1980,67(2):349-366

Theoretical models are attempted for eight moderate excitation planetary nebulae which have been intensively observed with the image-tube scanner at Lick and in other investigations. The models are uniform density structures, often truncated, with central star energy distributions and chemical compositions so adjusted as to give an optimum fit with the observations. Although a satisfactory representation can be obtained for most of the stronger, usually observed lines, those arising from the 3p ³ configuration, specifically the nebular transitions of [Sii], [Cliii], and [Ariv], often give difficulties. A comparison with results of model predictions with those from simple, traditional procedures generally shows a good agreement, except in those instances where different judgments are made in interpreting emissions of ions of 3p ⁿ configurations.  相似文献   

Deflection of plumes by mantle shear flow: experimental results and a simple theory   总被引：4，自引：0，他引：4  

Mark A. Richards  Ross W. Griffiths 《Geophysical Journal International》1988,94(3):367-376

  相似文献   

Neutral gas composition measurements between 80 and 120 km     

D. Offermann  V. Friedrich  P. Ross  U. Von Zahn 《Planetary and Space Science》1981,29(7):747-764

Atmospheric composition in the turbopause regime was determined by four rocket-borne mass spectrometers, which employed shock-freezing cryo-ion sources. Number densities of N₂, O₂, O, Ar and CO₂ are presented for these experiments. The results are compared with those of other rocket experiments taken from the literature. Ar/N₂ ratios are analyzed with respect to atmospheric turbulence. Magnitude and variability of atomic oxygen layer maximum density and layer content are discussed. Variations of O densities and simultaneous Ar/N₂ ratio changes are compared. Six CO₂ measurements are discussed in terms of CO₂/N₂ ratios.  相似文献   

Response to Beckmen et al. ("Organochlorine contaminant exposure and associations with haematological and humoral immune functional assays with dam age as a factor in free-ranging northern fur seal pups"; Marine Pollution Bulletin 46: 594-606)     

Ross PS 《Marine pollution bulletin》2004,48(7-8):806-7; author reply 808-9

  相似文献