ar X iv : a st ro - p h / 98 12 27 3 v 2 7 J an 1 99 9 A possible gravitational lens in the Hubble Deep Field South
نویسندگان
چکیده
We model an apparent gravitational lens system HDFS 2232509–603243in the Hubble Deep Field South. The system consists of a blue V = 25 mag arc separated by 0. 9 from a red V = 22 mag elliptical galaxy. A mass distribution which follows the observed light distribution with a constant mass-to-light ratio can fit the arc component positions if external shear is added. A good fit is also obtained with simple parameterized models, and all the models predict a fourth image fainter than the detection limit. The inferred mass-to-light ratio is ∼ 15 in solar units if the lens is at z = 0.6. The lens models predict a velocity dispersion of ∼ 280 km s which could be confirmed with spectroscopy. Subject headings: cosmology: observations — galaxies: individual (HDFS 2232509– 603243) — gravitational lensing
منابع مشابه
ar X iv : a st ro - p h / 98 12 27 3 v 1 1 5 D ec 1 99 8 A possible gravitational lens in the Hubble Deep Field South 1
We model an apparent gravitational lens system HDFS 2232509–603243 in the Hubble Deep Field South. The system consists of a blue V = 25 mag arc separated by 0. 9 from a red V = 22 mag elliptical galaxy. A mass distribution which follows the observed light distribution with a constant mass-to-light ratio can fit the arc component positions if external shear is added. A good fit is also obtained ...
متن کاملar X iv : a st ro - p h / 99 10 02 5 v 1 1 O ct 1 99 9 The CASTLES gravitational lensing tool
We describe a series of new applications of gravitational lenses as astrophysical and cosmological tools. Such applications are becoming possible thanks to advances in the quality and quantity of observations. CASTLES (CfA-Arizona-Space-Telescope-LEns-Survey) 1 is an ongoing project that exploits the sensitivity and resolution of the Hubble Space Telescope (HST) at optical and infrared waveleng...
متن کاملar X iv : a st ro - p h / 98 12 12 1 v 1 7 D ec 1 99 8 Nuclear kpc - sized disks of spiral galaxies
A complex structure of nuclear disks of normal spiral galaxies is illustrated on the example of five galaxies, observed at 6m telescope. A problem of gravitational stability of nuclear disks is shortly discussed.
متن کاملar X iv : a st ro - p h / 98 09 06 4 v 1 5 S ep 1 99 8 Velocity Dispersion of the Gravitational Lens 0957 + 561 1
0957+561 is the first gravitational lens system to be discovered and first for which a time delay was measured. Because the system is unusually rich in observables such as image positions, fluxes, VLBI structure, and polarization it has been modelled quite extensively. However, since it resides in a cluster providing substantial convergence, the velocity dispersion of the lensing galaxy is an i...
متن کاملar X iv : a st ro - p h / 99 07 36 3 v 1 2 6 Ju l 1 99 9 The complete explanation and implications of the deep space anomaly
Shown are that the current notion of cosmological expansion is contradicted by the equivalence principle, and that the correct theory involves a fundamental principle of physical scale predicting the cosmological constant, planetary Hubble flow and all aspects of the deep space anomaly.
متن کامل