Structure and kinematics of edge-on galaxy discs – V. The dynamics of stellar discs     

M. Kregel  P. C. van der Kruit  K. C. Freeman 《Monthly notices of the Royal Astronomical Society》2005,358(2):503-520

  相似文献   

A deep kinematic survey of planetary nebulae in the Andromeda galaxy using the Planetary Nebula Spectrograph     

H. R. Merrett  M. R. Merrifield  N. G. Douglas  K. Kuijken  A. J. Romanowsky  N. R. Napolitano  M. Arnaboldi  M. Capaccioli  K. C. Freeman  O. Gerhard  L. Coccato  D. Carter  N. W. Evans  M. I. Wilkinson  C. Halliday  T. J. Bridges 《Monthly notices of the Royal Astronomical Society》2006,369(1):120-142

  相似文献   

Erratum: The radial velocity dispersion profile of the Galactic halo: constraining the density profile of the dark halo of the Milky Way     

Giuseppina Battaglia  Amina Helmi  Heather Morrison  Paul Harding  Edward W. Olszewski  Mario Mateo  Kenneth C. Freeman  John Norris  Stephen A. Shectman 《Monthly notices of the Royal Astronomical Society》2006,370(2):1055-1056

  相似文献   

Extent of the last ice sheet in northern Scotland tested with cosmogenic 10Be exposure ages     

William M. Phillips  Adrian M. Hall  Colin K. Ballantyne  Steven Binnie  Peter W. Kubik  Stewart Freeman 《第四纪科学杂志》2008,23(2):101-107

The extent of the last British–Irish Ice Sheet (BIIS) in northern Scotland is disputed. A restricted ice sheet model holds that at the global Last Glacial Maximum (LGM; ca. 23–19 ka) the BIIS terminated on land in northern Scotland, leaving Buchan, Caithness and the Orkney Islands ice‐free. An alternative model implies that these three areas were ice‐covered at the LGM, with the BIIS extending offshore onto the adjacent shelves. We test the two models using cosmogenic ¹⁰Be surface exposure dating of erratic boulders and glacially eroded bedrock from the three areas. Our results indicate that the last BIIS covered all of northern Scotland during the LGM, but that widespread deglaciation of Caithness and Orkney occurred prior to rapid warming at ca. 14.5 ka. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   

The HIPASS catalogue – I. Data presentation     

M. J. Meyer  M. A. Zwaan  R. L. Webster  L. Staveley-Smith  E. Ryan-Weber  M. J. Drinkwater  D. G. Barnes  M. Howlett  V. A. Kilborn  J. Stevens  M. Waugh  M. J. Pierce  R. Bhathal  W. J. G. de Blok  M. J. Disney  R. D. Ekers  K. C. Freeman  D. A. Garcia  B. K. Gibson  J. Harnett  P. A. Henning  H. Jerjen  M. J. Kesteven  P. M. Knezek  B. S. Koribalski  S. Mader  M. Marquarding  R. F. Minchin  J. O'Brien  T. Oosterloo  R. M. Price  M. E. Putman  S. D. Ryder  E. M. Sadler  I. M. Stewart  F. Stootman  A. E. Wright 《Monthly notices of the Royal Astronomical Society》2004,350(4):1195-1209

  相似文献   

First results from the H i Jodrell All Sky Survey: inclination-dependent selection effects in a 21-cm blind survey     

Robert H. Lang  Peter J. Boyce  Virginia A. Kilborn  Robert F. Minchin  Michael J. Disney  Christine A. Jordan  Marco Grossi  Diego A. Garcia  Ken C. Freeman  Steven Phillipps  Alan E. Wright 《Monthly notices of the Royal Astronomical Society》2003,342(3):738-758

  相似文献   

The HIPASS catalogue – II. Completeness, reliability and parameter accuracy     

M. A. Zwaan  M. J. Meyer  R. L. Webster  L. Staveley-Smith  M. J. Drinkwater  D. G. Barnes  R. Bhathal  W. J. G. de Blok  M. J. Disney  R. D. Ekers  K. C. Freeman  D. A. Garcia  B. K. Gibson  J. Harnett  P. A. Henning  M. Howlett  H. Jerjen  M. J. Kesteven  V. A. Kilborn  P. M. Knezek  B. S. Koribalski  S. Mader  M. Marquarding  R. F. Minchin  J. O'Brien  T. Oosterloo  M. J. Pierce  R. M. Price  M. E. Putman  E. Ryan-Weber  S. D. Ryder  E. M. Sadler  J. Stevens  I. M. Stewart  F. Stootman  M. Waugh  A. E. Wright 《Monthly notices of the Royal Astronomical Society》2004,350(4):1210-1219

  相似文献   

The radial velocity dispersion profile of the Galactic halo: constraining the density profile of the dark halo of the Milky Way     

Giuseppina Battaglia  Amina Helmi  Heather Morrison  Paul Harding  Edward W. Olszewski  Mario Mateo  Kenneth C. Freeman  John Norris  Stephen A. Shectman 《Monthly notices of the Royal Astronomical Society》2005,364(2):433-442

  相似文献   

Mass-to-light ratio gradients in early-type galaxy haloes   总被引：1，自引：0，他引：1  

N. R. Napolitano  M. Capaccioli  A. J. Romanowsky  N. G. Douglas  M. R. Merrifield  K. Kuijken  M. Arnaboldi  O. Gerhard  K. C. Freeman 《Monthly notices of the Royal Astronomical Society》2005,357(2):691-706

Owing to the fact that the near future should see a rapidly expanding set of probes of the halo masses of individual early-type galaxies, we introduce a convenient parameter for characterizing the halo masses from both observational and theoretical results:  ∇_ℓϒ  , the logarithmic radial gradient of the mass-to-light ratio. Using halo density profiles from Λ-cold dark matter (CDM) simulations, we derive predictions for this gradient for various galaxy luminosities and star formation efficiencies  ε_SF  . As a pilot study, we assemble the available  ∇_ℓϒ  data from kinematics in early-type galaxies – representing the first unbiased study of halo masses in a wide range of early-type galaxy luminosities – and find a correlation between luminosity and  ∇_ℓϒ  , such that the brightest galaxies appear the most dark-matter dominated. We find that the gradients in most of the brightest galaxies may fit in well with the ΛCDM predictions, but that there is also a population of fainter galaxies whose gradients are so low as to imply an unreasonably high star formation efficiency  ε_SF > 1  . This difficulty is eased if dark haloes are not assumed to have the standard ΛCDM profiles, but lower central concentrations.  相似文献   

High resolution absorption cross section measurements of SO₂ at 213 K in the wavelength region 172–240 nm     

D.E. Freeman  K. Yoshino  J.R. Esmond  W.H. Parkinson 《Planetary and Space Science》1984,32(9):1125-1134

Laboratory measurements at high resolution of the absorption cross section of SO₂ at the temperature 213 K have been performed in the wavelength region 172–240 nm with a 6.65 m scanning spectrometer/spectrograph operated at an instrumental width of 0.002 nm. The measured cross sections are presented graphically in representative wavelength regions and are available throughout the region 172–240 nm at wavenumber intervals of 0.4–0.1 cm^?1 as a numerical tabulation stored on magnetic tape from the National Space Science Data Center, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, U.S.A. The measured cross sections, which are relevant to the photochemistry of planetary atmospheres, possess significantly more spectroscopic structure, and are more accurate, than previous measurements made at lower resolution.  相似文献