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
نویسندگان
چکیده
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 with simple parameterized models, and all the models predict a forth 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. Prospects for obtaining spectroscopic redshifts of the elliptical galaxy and the arc are good. Subject headings: galaxies: individual: HDFS 2232509–603243 — gravitational lensing — cosmology
منابع مشابه
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
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 w...
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 12 22 5 v 1 1 1 D ec 1 99 8 Large Scale Structure and Cosmological
A sort of gravitational waveguide effect in cosmol-ogy could explain some anomalous phenomena which cannot be understood by the current gravitational lensing models as the existence of " twins " objects with similar spectra and redshifts posed on the sky with large angular distance. Furthermore, the huge luminosities of quasars could be explained using filamen-tary or planar cosmological struct...
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 03 15 5 v 1 1 3 M ar 1 99 8 Deep ISOCAM Observations of Abell 2218
We report on the mid-infrared imaging at 5, 7, 10 & 15 µm of the galaxy cluster Abell 2218 obtained with the ISOCAM instrument onboard ESA's Infrared Space Observatory (ISO), as part of an ongoing program to image gravitational arcs and arclets in distant clusters. Several cluster galaxies as well as field galaxies are detected. We discuss their mid-IR flux properties.
متن کامل