Dataset DOI: 10.5061/dryad.sqv9s4ngq

Description of the data and file structure

Most data products in this dataset are provided in the Flexible Image Transport System (FITS) format, which is the standard data format used in astronomy. These FITS files can be opened and visualized using freely available software and libraries such as SAOImage DS9, CARTA, and Python libraries, including Astropy. These tools allow users to view images, inspect headers, and analyze spectral cubes while preserving the original astronomical coordinate information.

All FITS files follow the standard FITS format, and no structural modifications were made to the standardized header–data format. The files preserve the original World Coordinate System (WCS) information in their headers, allowing direct mapping to celestial coordinates (Right Ascension and Declination).

Description of Files Included in the Dataset

Spectral line data cubes

• 13co_cube_JCMT_HARP.fits – Spectral cube of the ¹³CO emission observed with the HARP on the James Clerk Maxwell Telescope.
• c18o_cube_JCMT_HARP.fits – Spectral cube of the C¹⁸O emission observed with the HARP.
• MWISP_PMO_13CO.fits – ¹³CO spectral cube from the Milky Way Imaging Scroll Painting Survey obtained with the Purple Mountain Observatory 13.7 m Telescope.

Polarization maps

• Stokes_I_mjy_beam_JCMT.fits – Stokes I (total intensity) continuum map in units of mJy beam⁻¹ from James Clerk Maxwell Telescope observations.
• Stokes_Q_mjy_beam_JCMT.fits – Stokes Q polarization map in units of mJy beam⁻¹.
• Stokes_U_mjy_beam_JCMT.fits – Stokes U polarization map in units of mJy beam⁻¹.
• Stokes_I_Planck.fits – Large-scale Stokes I intensity map from the Planck polarization data.
• Stokes_Q_Planck.fits – Stokes Q polarization map from the Planck dataset.
• Stokes_U_Planck.fits – Stokes U polarization map from the Planck dataset.

Derived polarization catalog

• cepA_2sigma.csv – A processed polarization catalog in CSV format containing derived polarization quantities. The table includes the following columns:

  RA, DEC, I, DI, Q, DQ, U, DU, P, DP, ANG, DANG, PI, DPI

  where:

  • I, Q, U are the Stokes parameters representing the total intensity and linear polarization components, measured in mJy beam⁻¹. DI, DQ, DU are their corresponding uncertainties, also in mJy beam⁻¹.
  • P is the polarization fraction measured in %, and DP is its uncertainty in %.
  • ANG is the polarization position angle measured in degrees (°), and DANG is the uncertainty in the polarization angle in degrees (°).
  • PI is the polarized intensity measured in mJy beam⁻¹, and DPI is its corresponding uncertainty in mJy beam⁻¹.

  The catalog includes only measurements satisfying the following selection criteria: I/DI >= 10, PI/DPI >= 2, and P <= 30 %. CSV files can be opened as  standard spreadsheet programs or analyzed with programming libraries such as Pandas.