HST/ACS emission line imaging of low-redshift 3CR radio galaxies. I. the data

Grant Tremblay, Mario Chiaberge, William Sparks, Stefi Baum, Mark Allen, David Axon, Alessandro Capetti, David Floyd, F Macchetto, George Miley, Jacob Noel-Storr, Christopher O'Dea, Eric Perlman, Alice Quillen

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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 HI? (6563 ??, plus [N II] contamination) and [O III]I>5007 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 HI?+[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
Original languageEnglish
Pages (from-to)278 - 294
Number of pages17
JournalThe Astrophysical Journal Supplement Series
Issue number2
Publication statusPublished - 2009
Externally publishedYes

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