David S. Graff
Ohio State University
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Publication
Featured researches published by David S. Graff.
The Astrophysical Journal | 2000
C. Afonso; C. Alard; J. N. Albert; J. Andersen; R. Ansari; E. Aubourg; P. Bareyre; F. Bauer; J. P. Beaulieu; A. Bouquet; S. Char; X. Charlot; F. Couchot; C. Coutures; F. Derue; R. Ferlet; J. F. Glicenstein; A. Gould; David S. Graff; M. Gros; J. Haissinski; J. C. Hamilton; D. Hardin; J. de Kat; A. Kim; T. Lasserre; E. Lesquoy; C. Loup; C. Magneville; J.-B. Marquette
We fit the data for the binary lens microlensing event MACHO 98-SMC-1 from five different microlensing collaborations and find two distinct solutions characterized by binary separation d and mass ratio q: (d,q) = (0.54,0.50) and (d,q) = (3.65,0.36), where d is in units of the Einstein radius. However, the relative proper motion of the lens is very similar in the two solutions, 1.30 km s-1 kpc-1 and 1.48 km s-1 kpc-1, thus confirming that the lens is in the Small Magellanic Cloud. The close binary can be either rotating or approximately static but the wide binary must be rotating at close to its maximum allowed rate to be consistent with all the data. We measure limb-darkening coefficients for five bands ranging from I to V. As expected, these progressively decrease with rising wavelength. This is the first measurement of limb darkening for a metal-poor A star.
The Astrophysical Journal | 2001
Fred C. Adams; David S. Graff; Douglas O. Richstone
We construct a model for the formation of black holes within galactic bulges. The initial state is a slowly rotating isothermal sphere, characterized by effective transport speed
Astronomy and Astrophysics | 2003
C. Afonso; Julie N. L. Albert; J. Andersen; R. Ansari; E. Aubourg; P. Bareyre; J. P. Beaulieu; Guillaume Blanc; X. Charlot; Francois Couchot; C. Coutures; R. Ferlet; P. Fouque; J. F. Glicenstein; Bertrand Goldman; A. Gould; David S. Graff; M. Gros; J. Haissinski; C. Hamadache; J. de Kat; T. Lasserre; L. Leguillou; E. Lesquoy; C. Loup; C. Magneville; J.-B. Marquette; E. Maurice; A. Maury; A. Milsztajn
\aeff
Astronomy and Astrophysics | 2006
C. Hamadache; L. Le Guillou; P. Tisserand; C. Afonso; J. N. Albert; J. Andersen; R. Ansari; E. Aubourg; P. Bareyre; J. P. Beaulieu; X. Charlot; C. Coutures; R. Ferlet; P. Fouque; J. F. Glicenstein; Bertrand Goldman; A. Gould; David S. Graff; M. Gros; J. Haissinski; J. de Kat; E. Lesquoy; C. Loup; C. Magneville; J.-B. Marquette; E. Maurice; A. Maury; A. Milsztajn; M. Moniez; N. Palanque-Delabrouille
and rotation rate
Astronomy and Astrophysics | 2004
G. Blanc; C. Afonso; C. Alard; J. N. Albert; G. Aldering; A. Amadon; J. Andersen; R. Ansari; E. Aubourg; C. Balland; P. Bareyre; J. P. Beaulieu; X. Charlot; A. Conley; C. Coutures; Tomas Dahlen; F. Derue; Xiaohui Fan; R. Ferlet; G. Folatelli; P. Fouque; G. Garavini; J. F. Glicenstein; Ariel Goobar; A. Gould; David S. Graff; M. Gros; J. Haissinski; C. Hamadache; D. Hardin
\Omega
The Astrophysical Journal | 1996
David S. Graff; Katherine Freese
. The black hole mass is determined when the centrifugal radius of the collapse flow exceeds the capture radius of the central black hole. This model reproduces the observed correlation between black hole masses and galactic velocity dispersions,
The Astrophysical Journal | 2000
Brian D. Fields; Katherine Freese; David S. Graff
\mbh \approx 10^8 M_\odot (\sigma/200 \kms)^4
The Astrophysical Journal | 2000
David S. Graff; Andrew Gould; Nicholas B. Suntzeff; Robert A. Schommer; Eduardo Hardy
, where
The Astrophysical Journal | 1996
David S. Graff; Katherine Freese
\sigma = \sqrt{2} \aeff
New Astronomy | 1998
Brian D. Fields; Katherine Freese; David S. Graff
. This model also predicts the ratio
