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Morphologies of Two Massive Old Galaxies at z ~ 2.5
Alan Stockton, Elizabeth McGrath, Gabriela Canalizo +2
We present the results of NICMOS imaging of two massive galaxies photometrically selected to have old stellar populations at z ~ 2.5. Both galaxies are dominated by apparent disks…
Morphologies and Color Gradients of Luminous Evolved Galaxies at z~1.5
Elizabeth J. McGrath, Alan Stockton, Gabriela Canalizo +2
We have examined in detail the morphologies of seven z~1.5 passively evolving luminous red galaxies using high resolution HST NICMOS and ACS imaging data. Almost all of these galax…
Identification and Morphologies of Galaxies with Old Stellar Populations at z ~ 2.5
Alan Stockton, Elizabeth McGrath
We describe a study of morphologies of galaxies with old stellar populations in radio-source fields at z ~ 2.5. A significant fraction of these are dominated by disks of old stars,…
Extremely Red Objects in Two Quasar Fields at z ~ 1.5
Alan Stockton, Elizabeth McGrath, Gabriela Canalizo
We present an investigation of the properties and environments of bright extremely red objects (EROs) found in the fields of the quasars TXS 0145+386 and 4C 15.55, both at z ~ 1.4.…
Water Masers in W49 North and Sagittarius B2
E. J. McGrath, W. M. Goss, C. G. De Pree
Using the Very Large Array (VLA) of the National Radio Astronomy Observatory in the A and B configurations, we have obtained simultaneous high resolution observations of both the 2…
Optical and radio variability of the BL Lac object AO 0235+16: a possible 5-6 year periodicity
C. M. Raiteri, M. Villata, H. D. Aller +33
New optical and radio data on the BL Lacertae object AO 0235+16 have been collected in the last four years by a wide international collaboration, which confirm the intense activity…