Document Type
Article
Publication Title
The Astrophysical Journal Supplement Series
Abstract
We present 19 nearby (z < 0.3) 3CR radio galaxies imaged at low and high excitation as part of a Cycle 15 Hubble Space Telescope (HST) snapshot survey with the Advanced Camera for Surveys (ACS). These images consist of exposures of the Hα (6563 Å, plus [N ii] contamination) and [O iii]λ5007 emission lines using narrowband linear ramp filters adjusted according to the redshift of the target. To facilitate continuum subtraction, a single-pointing 60 s line-free exposure was taken with a mediumband filter appropriate for the target’s redshift. We discuss the steps taken to reduce these images independently of the automated recalibration pipeline so as to use more recent ACS flat-field data as well as to better reject cosmic rays. We describe the method used to produce continuum-free (pure line-emission) images, and present these images along with qualitative descriptions of the narrow-line region morphologies we observe. We present Hα+[N ii] and [O iii] line fluxes from aperture photometry, finding the values to fall expectedly on the redshift–luminosity trend from a past HST/WFPC2 emission line study of a larger, generally higher redshift subset of the 3CR.We also find expected trends between emission line luminosity and total radio power, as well as a positive correlation between the size of the emission line region and redshift. We discuss the associated interpretation of these results, and conclude with a summary of future work enabled by this data set.
First Page
278
Last Page
294
DOI
10.1088/0067-0049/183/2/278
Publication Date
8-2009
Recommended Citation
Tremblay, Grant R.; Chiaberge, Marco; Sparks, William B.; Baum, Stefi A.; Allen, Mark G.; Axon, David J.; Capetti, Alessandro; Floyd, David J. E.; Macchetto, F. Duccio; Miley, George K.; Noel-Storr, Jacob; O'Dea, Christopher P.; Perlman, Eric S.; and Quillen, Alice C., "HST/ACS Emission Line Imaging Of Low-Redshift 3CR Radio Galaxies. I. The Data" (2009). Aerospace, Physics, and Space Science Faculty Publications. 659.
https://repository.fit.edu/apss_faculty/659