Date: 2024 Apr 05

Dataset Title: Line of Sight Velocity Distributions and Photometry Data for the paper The Black Hole Mass and Photometric Components of NGC 4826

Dataset Creators: Kayhan Gultekin (https://orcid.org/0000-0002-1146-0198), Karl Gebhardt (https://orcid.org/0000-0002-8433-8185), John Kormendy (https://orcid.org/0000-0001-9854-5217), Adi Foord (https://orcid.org/0000-0002-1616-1701), Ralf Bender (https://orcid.org/0000-0001-7179-0626), Tod Lauer  (https://orcid.org/0000-0003-3234-7247), Jason Pinkney, Douglas O. Richstone, Scott Tremaine       (https://orcid.org/0000-0002-0278-7180)

Dataset Contact: Kayhan Gultekin (kayhan@umich.edu)

This dataset contains this README, and several ascii files with data formats explained below.

losvd_data.csv:
This file contains line-of-sight velocity distributions (LOSVDs) for the galaxy NGC 4826 taken from HST/STIS and HET/LRS as explained in the associated paper.  Columns of this file are:
  spatial_bin_index: index indicating which spatial bin the LOSVD belongs to. Corresponds to coordinates given in losvd_spat_bins.csv. Indexing starts at 1 because the program was written in FORTRAN 77. values 1--8 correspond to HST spectra.  Values 9--38 correspond to HET spectra.
  velocity_bin_index: index indicating which velocity bin the line belongs to,
  velocity: central velocity of the velocity bin in km/s
  f: distribution function value (arbitrary units)
  f_upper: The 1-sigma upper bound on f,
  f_lower: The 1-sigma lower bound on f

losvd_spat_bins.csv:
This file contains coordinates and information for the spatial bins of the LOSVDs.  Coordinates are given in x and y, relative to the center of the galaxy defined by the dispersion peak of the galaxy, and the major axis of the galaxy corresponds to y=0.  Units of coordinates are arcsec.  Spatial bins are only defined for the upper-right quadrant as symmetry is assumed. Columns of this file are:
  spatial_bin_index: index indicating which spatial bin the LOSVD belongs to. LOSVD values are given in losvd_data.csv. Indexing starts at 1 because the program was written in FORTRAN 77. values 1--8 correspond to HST spectra.  Values 1 and 2 correspond to bins that were taken from the negative-x side of the galaxy (West?) but have been flipped (appropriately changed in the LOSVD data as well) to the positive side for symmetry.  Values 9--38 correspond to HET spectra.
  x_center: x-coordinate of bin  
  y_center: y-coordinate of bin 
  instr_code: 1 = HST data, 2 = HET data
  x_min: min x-coord of spatial bin (if x_max = -1 width of bin is half-way between neighboring bins)
  x_max: max x-coord of spatial bin (if x_max = -1 width of bin is half-way between neighboring bins)
  y_min: min y-coord of spatial bin
  y_max: max y-coord of spatial bin



Use and Access:
This data set is made available under a Creative Commons BY-NC license (CC BY_NC 4.0), http://creativecommons.org/licenses/by-nc/4.0/.

To Cite Data:
Gultekin, K., Gebhardt, K., Kormendy, J., Foord, A., Bender, R., Lauer, T. R., Pinkney, J., Richstone, D. O., Tremaine, S. Line of Sight Velocity Distributions and Photometry Data for the paper The Black Hole Mass and Photometric Components of NGC 4826 [Data set], University of Michigan - Deep Blue Data. https://doi.org/10.7302/kr8z-fj9