219 citations · 362 across the 10 of their papers we have counts for
12 papers
The dependence of HII region properties on global and local surface brightness within galaxy discs
J. F. Helmboldt, R. A. M. Walterbos, G. D. Bothun +2
Using B, R, and H-alpha images of roughly equal-sized samples of low surface brightness (LSB) and high surface brightness (HSB) galaxies (~40 galaxies apiece), we have explored the…
A shrinking Compact Symmetric Object: J11584+2450?
S. E. Tremblay, G. B. Taylor, J. F. Helmboldt +2
We present multi-frequency multi-epoch Very Long Baseline Array (VLBA) observations of J11584+2450. These observations clearly show this source, previously classified as a core-jet…
Current star formation in early-type galaxies and the K+A phenomenon
J. F. Helmboldt, R. A. M. Walterbos, T. Goto
We present the results of an effort to identify and study a sample of the likely progenitors of elliptical (E) and lenticular (S0) K+A galaxies. To achieve this, we have searched a…
A Statistical Description of AGN Jet Evolution from the VLBA Imaging and Polarimetry Survey (VIPS)
J. F. Helmboldt, G. B. Taylor, R. C. Walker +1
A detailed analysis of the evolution of the properties of core-jet systems within the VLBA Imaging and Polarimetry Survey (VIPS) is presented. We find a power-law relationship betw…
Characteristics of EGRET Blazars in the VLBA Imaging and Polarimetry Survey (VIPS)
G. B. Taylor, S. E. Healey, J. F. Helmboldt +12
We examine the radio properties of EGRET-detected blazars observed as part of the VLBA Imaging and Polarimetry Survey (VIPS). VIPS has a flux limit roughly an order of magnitude be…
Radio Frequency Spectra of 388 Bright 74 MHz Sources
J. F. Helmboldt, N. E. Kassim, A. S. Cohen +2
As a service to the community, we have compiled radio frequency spectra from the literature for all sources within the VLA Low Frequency Sky Survey (VLSS) that are brighter than 15…