These data came from research that was geared towards measuring the mass of the black hole in the galaxy NGC 4826. The data are line-of-sight velocity distributions (LOSVDs) inferred from high-spatial resolution stellar absorption line spectra of Hubble Space Telescope / Space Telescope Imaging Spectrograph (HST/STIS) data and lower-spatial resolution stellar absorption line spectra of Hobby-Ebberly Telescope / Low-Resolution Spectrograph (HET/LRS) data. These data can be used for kinematic analysis of the galaxy NGC 4826 (M64) including black hole mass estimation. The HST/STIS data span about one arcsec, and the HET/LRS data span about 90 arcsec.
The data were processed using the scripted VLA calibration pipeline ( https://science.nrao.edu/facilities/vla/data-processing/pipeline/scripted-pipeline) for the Common Astronomy Software Applications (CASA) package version 5.3.0. Imaging was performed using the TCLEAN task in CASA with standard parameters appropriate for broadband data with point-source emissison. We used Briggs weighting with robust parameters between 0 and 1. Self calibration was implemented manually on an as-needed basis for sufficiently bright sources with evidence for residual phase errors in the image plane.
