The Quadruple Gravitational Lens PG 1115+080: Time Delays and Models | Zendy

Paul L. Schechter | Zendy; C. D. Bailyn | Zendy; Robert C. Barr | Zendy; Richard Barvainis | Zendy; C. M. Becker | Zendy; G. M. Bernstein | Zendy; John P. Blakeslee | Zendy; S. J. Bus | Zendy; Alan Dressler | Zendy; E. Falco | Zendy; Robert A. Fesen | Zendy; Phillipe Fischer | Zendy; Karl Gebhardt | Zendy; Dianne Harmer | Zendy; Jacqueline N. Hewitt | Zendy; J. Hjorth | Zendy; Todd Hurt | Zendy; A. O. Jaunsen | Zendy; Mario Mateo | Zendy; Doerte Mehlert | Zendy; D. O. Richstone | Zendy; Linda S. Sparke | Zendy; J. R. Thorstensen | Zendy; J. Tonry | Zendy; G. Wegner | Zendy; Daryl W. Willmarth | Zendy; Guy Worthey | Zendy

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The Quadruple Gravitational Lens PG 1115+080: Time Delays and Models

Author(s) -

Paul L. Schechter,

C. D. Bailyn,

Robert C. Barr,

Richard Barvainis,

C. M. Becker,

G. M. Bernstein,

John P. Blakeslee,

S. J. Bus,

Alan Dressler,

E. Falco,

Robert A. Fesen,

Phillipe Fischer,

Karl Gebhardt,

Dianne Harmer,

Jacqueline N. Hewitt,

J. Hjorth,

Todd Hurt,

A. O. Jaunsen,

Mario Mateo,

Doerte Mehlert,

D. O. Richstone,

Linda S. Sparke,

J. R. Thorstensen,

J. Tonry,

G. Wegner,

Daryl W. Willmarth,

Guy Worthey

Publication year - 1997

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/310478

Subject(s) - gravitational lens , physics , galaxy , astrophysics , photometry (optics) , strong gravitational lensing , mass distribution , galaxy rotation curve , lens (geology) , weak gravitational lensing , hubble's law , astronomy , galaxy formation and evolution , redshift , stars , optics

Optical photometry is presented for the quadruple gravitational lensPG1115+080. A preliminary reduction of data taken from November 1995 to June1996 gives component ``C'' leading component ``B'' by 23.7+/-3.4 days andcomponents ``A1'' and ``A2'' by 9.4 days. A range of models has been fit to theimage positions, none of which gives an adequate fit. The best fitting and mostphysically plausible of these, taking the lensing galaxy and the associatedgroup of galaxies to be singular isothermal spheres, gives a Hubble constant of42 km/s/Mpc for Omega=1, with an observational uncertainty of 14%, as computedfrom the B-C time delay measurement. Taking the lensing galaxy to have anapproximately E5 isothermal mass distribution yields H0=64 km/sec/Mpc whiletaking the galaxy to be a point mass gives H0=84 km/sec/Mpc. The former gives aparticularly bad fit to the position of the lensing galaxy, while the latter isinconsistent with measurements of nearby galaxy rotation curves. Constraints onthese and other possible models are expected to improve with planned HSTobservations.

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