Hubble Space TelescopeNear‐infrared and Optical Imaging of Faint Radio Sources in the Distant Cluster Cl 0939+4713
نویسندگان
چکیده
منابع مشابه
Hubble Space Telescope Near-infrared and Optical Imaging of Faint Radio Sources in the Distant Cluster Cl0939+4713
We present deep Hubble Space Telescope NICMOS near-infrared and WFPC2 optical imaging of a small region in the core of the distant rich cluster Cl 0939+4713 (z = 0.41). We compare the optical and near-infrared morphologies of cluster members and find apparent small-scale optical structures within the galaxies which are absent in the near-infrared. We conclude that strong dust obscuration is a c...
متن کاملFaint Radio Sources in the Noao Boötes Field: Vlba Imaging and Optical Identifications
As a step toward investigating the parsec-scale properties of faint extragalactic radio sources, the Very Long Baseline Array (VLBA) was used at 5.0 GHz to obtain phase-referenced images of 76 sources in the NOAOBoötes field. These 76 sources were selected from the Faint Images of the Radio Sky at Twenty cm (FIRST) catalog to have peak flux densities above 10 mJy at 500 resolution and deconvolv...
متن کاملOptical identifications of faint radio sources 1 1997
Deep imaging and spectroscopy have been carried out for optical counterparts of a sample of 68 faint radio sources (S > 0.2 mJy) in the “Marano Field”. About 60% of the sources have been optically identified on deep CCD exposures (limit R ' 24.0) or ESO 3.6–m plates (limit bJ ' 22.5). Thirty–four spectra (50% of the total radio sample) were obtained with the ESO 3.6–m telescope and 30 redshifts...
متن کاملOptical Properties of faint FIRST Variable Radio Sources
A sample of 123 radio sources that exhibit significant variations at 1.4 GHz on a seven year base-line has been created using FIRST VLA B-array data from 1995 and 2002 on a strip at δ = 0 near the south Galactic cap. This sample spans the range of radio flux densities from ∼ 2 to 1000 mJy. It presents both in size and radio flux density range a unique starting point for variability studies of g...
متن کاملOptically Faint Microjansky Radio Sources.
We report on the identifications of radio sources from our survey of the Hubble Deep Field (HDF) and the Small Selected Area 13 fields, both of which comprise the deepest radio surveys to date at 1.4 and 8.5 GHz, respectively. About 80% of the microjansky radio sources are associated with moderate-redshift starburst galaxies or active galactic nuclei within the I-magnitude range of 17-24 with a...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1999
ISSN: 0004-637X,1538-4357
DOI: 10.1086/307934