Data

Data#

Data Input#

The input data in brains depend on the option FlagDim specified in the parameter file (see Parameter File).

  • FlagDim = -2

    create fully random simulation data; no need to input data.

  • FlagDim = -1

    create simulation data according to input continuum and 2D line data. ContinuumFile and Line2DFile need to be specified.

  • FlagDim = 0

    only perform continuum reconstruction. ContinuumFile needs to be specified.

  • FlagDim = 1

    perform 1D line analysis. ContinuumFile and Line1DFile need to be specified.

  • FlagDim = 2

    perform 2D line analysis. ContinuumFile and Line2DFile need to be specified.

Data Format#

  • Light curve data of continuum and 1D line should contain three columns, which represent time, flux, and flux uncertainty, respectively.

  • 2D line data are formated as follows:

    The first line is # ne nb, which specify the number ne of epochs and the number nb of velocity bins.

    Then there are ne blocks. Each blocks looks like:

    # time
wavelength bin 0, flux, error
wavelength bin 1, flux, error
...
wavelength bin nb, flux, error

    where time is the epoch of the current block. Blocks are separated by a blank line.

    Note

    • Time should be given in observed frame. After reading in the data, the code automatically converts the time into rest frame by dividing with a factor \((1+z)\), to account for redshift effects.

    • Wavelength bins should be equally spaced and the unit of wavelength should be the same as that of LineCenter option in Parameter File.

    • Wavelength is converted into velocity as

      \[V = \frac{\lambda/(1+z) - \lambda_0}{\lambda_0},\]

      where \(\lambda_0\) is the rest-frame line center and \(z\) is the redshift.

Data Mask#

For 2D line data, brains can mask those velocity bins with negative errors.

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