Table A.2
Description of selected columns from the PHANGS-MUSE/HST Hα Nebulae Catalogue (part I).
| Column | Description |
|---|---|
| galaxy_name | Galaxy name |
| region_ID | Region identifier |
| flag_edge_hst | Flag=1 if region lies on HST image edge |
| flag_touch_hst | Flag=1 if region touches segmentation boundary |
| flag_manual_hst | Manual classification flags (visual checks) |
| flag_edge_muse | Flag=1 if region lies on MUSE cube edge |
| flag_star_muse | Flag=1 if affected by bright star in MUSE data |
| ra | Right ascension (J2000) of region centroid |
| dec | Declination (J2000) of region centroid |
| ra_peak | Right ascension (J2000) of Hα peak pixel |
| dec_peak | Declination (J2000) of Hα peak pixel |
| ra_muse | Right ascension (J2000) of MUSE centroid |
| dec_muse | Declination (J2000) of MUSE centroid |
| r_R25_deproj | Deprojected galactocentric radius, in R25 units |
| r_reff_deproj | Deprojected galactocentric radius, in Re units |
| phi_deproj | Deprojected azimuthal angle within host galaxy |
| environment | Environment flag following Querejeta et al. (2021) |
| area_circ_arcsec2 | Circularised area (arcsec2) |
| radius_circ_arcsec | Circularised radius (arcsec) |
| radius_circ_pc | Circularised radius (pc) |
| area_mom_arcsec2 | Second-moment area of region (arcsec2) |
| radius_major_mom_arcsec | Second-moment major axis (arcsec) |
| radius_minor_mom_arcsec | Second-moment minor axis (arcsec) |
| radius_pos_angle_deg | Position angle (moments-based) |
| radius_mom_arcsec | Moment-based radius (arcsec) |
| radius_mom_pc | Moment-based radius (pc) |
| radius_mom_deconv_pc | Deconvolved moment-based radius (pc) |
| radius_stromgren_pc | Stromgren radius (pc) |
| radius_circ_pc_muse | Circularised radius (pc; PHANGS-MUSE) |
| complexity_score | Morphological complexity score |
| halpha_flux | HST Hα integrated flux (raw, uncorrected) |
| halpha_flux_err | Error on HST Hα flux |
| halpha_flux_max | Maximum pixel flux in HST Hα map |
| halpha_flux_min | Minimum pixel flux in HST Hα map |
| halpha_flux_mean | Mean pixel flux in HST Hα map |
| halpha_flux_corr | Extinction-corrected HST Hα flux |
| halpha_flux_corr_err | Error on extinction-corrected HST Hα flux |
| <line>_flux_muse | Measured emission-line flux (PHANGS-MUSE) |
| <line>_flux_err_muse | Statistical uncertainty on flux (PHANGS-MUSE) |
| <line>_flux_corr_muse | Extinction-corrected flux (PHANGS-MUSE) |
| <line>_flux_corr_err_muse | Uncertainty on corrected flux (PHANGS-MUSE) |
| <line>_vel_muse | Velocity of <line> (PHANGS-MUSE) |
| <line>_vel_err_muse | Uncertainty on velocity of <line> (PHANGS-MUSE) |
| <line>_sigma_muse | Velocity dispersion of <line> (PHANGS-MUSE) |
| <line>_sigma_err_muse | Uncertainty on velocity dispersion of <line> (PHANGS-MUSE) |
| <line>_ew_muse | Equivalent width of <line> (Å; PHANGS-MUSE) |
| <line>_ew_err_muse | Uncertainty on equivalent width of <line> (Å; PHANGS-MUSE) |
| <line>_ew_<method>_muse | Equivalent width of <line> using <method> (Å; PHANGS-MUSE) |
| <line>_ew_<method>_err_muse | Uncertainty on equivalent width of <line> using <method> (Å; PHANGS-MUSE) |
Notes. This table lists structural, positional, and spectroscopic parameters, including fluxes, velocities, dispersions, and equivalent widths. The parameters correspond to those shown in the example catalogue entries in Table A.1. Here <line> denotes an emission line (e.g. halpha, hbeta, oiii5007, nii6584, sii6716, sii6731, siii9069, oi6300, nii5755, hei5876, siii6312, oi6363, oii7319, oii7330). All fluxes are in erg−1 cm−2; velocities and dispersions are in km s−1; equivalent widths are in Å. The suffix _err indicates 1σ statistical uncertainties; _corr indicates extinction-corrected values. The suffixes _vel and _sigma give line-of-sight velocity and velocity dispersion, respectively. EW variants use _raw (direct from the spectrum), _fit (from a fitted continuum/emission model), and _bgcorr (background-corrected). HST-specific columns halpha_flux_max, _min, and _mean are pixel statistics from the HST Hα map; halpha_flux_corr and _corr_err are extinction-corrected flux and its uncertainty.
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