Publications by James Binney


Accretion by galaxies

ASTR SOC P 197 (2000) 107-114

JJ Binney

Both theory and observation indicate that galaxies like the Milky Way accrete matter at the rate of a few M. per year.


The orbit and mass of the Sagittarius dwarf galaxy

Monthly Notices of the Royal Astronomical Society 314 (2000) 468-474

IG Jiang, J Binney

Possible orbital histories of the Sgr dwarf galaxy are explored. A special-purpose N-body code is used to construct the first models of the Milky Way-Sgr dwarf system in which both the Milky Way and the Sgr dwarf are represented by full N-body systems and followed for a Hubble time. These models are used to calibrate a semi-analytic model of the Sgr dwarf's orbit that enables us to explore a wider parameter space than is accessible to the N-body models. We conclude that the extant data on the Sgr dwarf are compatible with a wide range of orbital histories. At one extreme the Sgr dwarf initially possesses ∼1011 M⊙ and starts from a Galactocentric distance RD(0) ≳ 200 kpc. At the other extreme the Sgr dwarf starts with ∼109 M⊙ and RD(0) ∼60 kpc, similar to its present apocentric distance. In all cases the Sgr dwarf is initially dark matter dominated and the current velocity dispersion of the Sgr dwarf's dark matter is tightly constrained to be 21 ± 2 km s-1. This number is probably compatible with the smaller measured dispersion of the Sgr dwarf's stars because of (i) the dynamical difference between dark and luminous matter, and (ii) velocity anisotropy.


Obituary - Dennis Sciama 1926-1999

PHYSICS WORLD 13 (2000) 11-11

J Binney


Dark matter - Lumpy haloes spin faster

NATURE 401 (1999) 27-+

J Binney


The abundance of brown dwarfs

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 307 (1999) L27-L30

J Binney


Warps and cosmic infall

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 303 (1999) L7-L10

IG Jiang, J Binney


Dynamics of the solar neighborhood

ASTR SOC P 182 (1999) 285-296

JJ Binney

The Hipparcos mission has prompted a thorough reanalysis of the kinematics of the Solar neighborhood. Reliable proper motions are now available for a photometrically complete sample of similar to 10(6) stars, but the largest complete sample of stars with good parallaxes contains only similar to 10(4) stars. The latter sample yields precise values for the first and second moments of near main-sequence stars as a function of color. The effects of the secular increase in velocity dispersion are very evident. From these moments one can redetermine the velocity of the LSR and the age of the Solar neighborhood rather precisely. One can also determine how the density of stars in velocity space varies in the neighborhood of the LSR. This density distribution proves to be significantly more complex than the Schwarzschild distribution and may be affected by the Galactic bar. The larger sample for which only proper motions can be obtained allows one to probe gradients in the large-scale streaming motions that the Oort constants aim to describe. Here again the data imply a significantly more complex situation than has been considered previously. It is probable that these complexities are in part caused by spiral arms and/or the central Galactic bar.


M 87 and cooling flows

RADIO GALAXY MESSIER 87 530 (1999) 116-129

J Binney


Dynamical models of the inner milky way

GALAXY DYNAMICS: A RUTGERS SYMPOSIUM 182 (1999) 327-328

R Hafner, W Evans, W Dehnen, J Binney


The persistence of warps in spiral galaxies with massive haloes

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 297 (1998) 1237-1244

J Binney, IG Jiang, S Dutta


The LMC microlensing events: Evidence for a warped and flaring Milky Way disk?

ASTROPHYSICAL JOURNAL 501 (1998) L45-L49

NW Evans, G Gyuk, MS Turner, J Binney


Unexpected stellar velocity distribution in the warped Galactic disk

NATURE 392 (1998) 471-473

RL Smart, R Drimmel, MG Lattanzi, JJ Binney


Mass models of the Milky Way

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 294 (1998) 429-438

W Dehnen, J Binney


The persistence of warps in massive halos

GALACTIC HALOS: A UC SANTA CRUZ WORKSHOP 136 (1998) 379-381

IG Jiang, S Dutta, J Binney


Galactic astronomy

Princeton Univ Pr, 1998

J Binney, M Merrifield

GALACTIC ASTRONOMY introduces all astronomical concepts necessary to understand the properties of galaxies, including coordinate systems, magnitudes and colors, ...


The microlensing optical depth of the COBE bulge

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 289 (1997) 651-659

N Bissantz, P Englmaier, J Binney, O Gerhard


Summary of the RAS Discussion Meeting on HIPPARCOS and the H-R Diagram

OBSERVATORY 117 (1997) 201-204

DW Evans, J Binney, C Hansen, F vanLeeuwen, M Perryman, J Lub, M Feast


The photometric structure of the inner Galaxy

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 288 (1997) 365-374

J Binney, O Gerhard, D Spergel


The outer rotation curve of the Milky Way

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 287 (1997) L5-L7

J Binney, W Dehnen


The properties of main-sequence stars from Hipparcos data

ESA SP PUBL 402 (1997) 279-282

N Houk, CM Swift, CA Murray, MJ Penston, JJ Binney

We received a sample of 6840 Hipparcos stars south of declination -26 degrees that (i) have MK spectral types in the Michigan catalogues and (ii) had spectroscopic parallaxes that placed them within 80 pc of the Sun. Of these, 3727 are well determined as luminosity class V and actually lie within 100 pc. From this subsample we can determine the distribution in M-V of main-sequence stars of given spectral type for spectral types that range from early F to early K. These distributions are significantly non-Gaussian, but when fitted to Gaussians they yield central values of M-V in good agreement with earlier estimates of the absolute magnitudes of main-sequence stars. We also determine anew the distribution of B-V at each spectral type. We find that the dispersion in B-V at given spectral type is very small.

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