Catalog of HII regions in the eCALIFA sample

C. Espinosa Ponce, 2021, C. Espinosa Ponce, et al. 2022

Summary

We distribute here the full catalog of HII regions based on the integral field spectroscopy (IFS) data of the extended CALIFA sample. This sample comprises galaxies in thenearby universe (z<0.03). The catalog provides with the spectroscopic information of 28,367 individual regions corresponding to 988 galaxies, including the flux intensitiesand equivalent widths of 52 emission lines covering the wavelength range between 3750-7000 AA. In addition, the information about the stellar population compositionintegrated along the line-of-sight of the aperture corresponding to each ionized regions provided. To our knowledge, this is the largest catalog of spectroscopic propertiesof HII regions. If you use this catalog, please cite: C. Espinosa Ponce, 2020

Format of the data

The catalog of HII regions described along this article, withthe full set of parameters derived for each region, is presentedin five different files for each galaxy (labeled by its name, GALNAME):

  • seg_Ha.GALNAME.fits: Fitsfile comprising the segmen-tation maps indicating the actual selection of HII regions. Each map has the same geometry and WCS of the original Hα maps used to select the regions. All pixels correspondingto each HII region is labeled with an single ID number thatidentifies that region along the catalog (for each galaxy), with IDs starting from one. Pixels labeled with zeroes cor-respond to areas excluded from the selection of HII regions.
  • mask_Ha.GALNAME.fits: Fitsfile comprising a mask of those pixels not considered to be part of any selected HIIregion.
  • HII.GALNAME.flux_elines.csv (.fits): CSV (FITs) table including the fluxes of the emission lines extracted for each HII region with in the considered galaxy, together with the location of the region with respect to the center of the galaxy. Each re-gion corresponds to one row, labeled with the ID included in the seg_Ha.GALNAME.fits file and the galaxy name (GAL-NAME).
  • HII.GALNAME.SFH.csv (.fits): CSV (FITs) table including the weightsof light (V-band) of the decomposition of the stellar population for each stellar population included in the SSP template adopted byPipe3D (Sanchez et al. 2016b). Details of the content in this file are given in Table C2.
  • HII.GALNAME.SSP.csv (.fits): CSV (FITs) table including the average properties of subyacent stellar population (age, [Z/H], dustattenuation), as described in Sanchez et al. (2016b).
  • HII.GALNAME.phys_props.csv (.fits): CSV (FITs) table including the physical properties of the HII regions, as described in Espinosa-Ponce et al. (submitted)

In addition the full data set is integrated into a single file in both the FITs-table and CSV formats.
An example of how to read the data and represent them can be found in the following gibhut repository.

Changelog

  • Version 1.3: Set of physical properties derived for each Hii region, including oxygen and nitrogen abundances, dust attenuation, ionization parameter....
  • Version 1.2: Fix error in the calculation of the error associated to flux emission lines.
  • Version 1.0: First version.