PHANGS-CAT

DR4 - Catalog Release 2

A set of 4 catalogs is provided for each of 40 targets: 37 individual galaxies + 1 companion dwarf galaxy (NGC 1510) + NGC 628C + NGC 628E.  The two pointings for NGC628 (NGC628C and NGC628E) are treated as separate targets because the V-band observations were obtained with two different instruments (ACS and WFC3). 

Changes relative to DR3 include (1) careful removal of artifacts (e.g., masks for bright stars, diffraction spikes) and non-clusters (e.g., background galaxies).  This results in a 8% decrease in the size of the ML-classified DR3 catalogs.  (2) Machine learning classifications for DR4 are determined using neural network models trained entirely on PHANGS sources and classifications as described in Hannon et al. (2023) (supersedes initial models of Wei et al. 2020). (3) Compact associations (class 3), as identified in the cluster pipeline, are provided in DR4.  The completeness of associations in these catalog is likely low (see Lee et al. 2022, section 4.7).  For science applications requiring complete samples of associations, multi-scale association catalogs generated using watershed algorithms (Larson et al. 2023, as provided in DR3) are recommended. Catalogs for multi-scale associations for 5 galaxies were provided in DR3, and catalogs for the remaining PHANGS galaxies may be provided at some future date.

The catalog files have the following naming convention:

hlsp_phangs-cat_hst_<ins>_<target>_<filter>_<version>_<type>.fits

where:

• <ins> = Name of instrument, either "uvis" or "acs-uvis" if both instruments used in the catalog
• <target> = Name of galaxy, e.g., "ngc1566"
• <filter> = "multi", since all the catalogs include data from several filters
• <version> = "v1" for version 1 of the catalogs
• <type> = Type of file:
  • For CLUSTER (class 1 & 2) catalog files:
  • 2x40 files: one file for each of 2 classification methods (human, machine) and 40 targets
    • "obs-human-cluster-class12.fits"
    • "obs-machine-cluster-class12.fits"
  • For COMPACT ASSOCIATION (class 3) catalog files:
  •  2x40 files: one file for each of  2 classification methods (human, machine) and 40 targets
    • "obs-human-compact-association-class3.fits"
    • "obs-machine-compact-association-class3.fits"
  • For U-B-V-I DIAGRAM REGION DEFINITION files:
  • 2x3 files: one file for each of 3 regions (YCL, MAP, OGC), and 2 classification methods (human, machine)
    • "ycl-human-ubvi.txt" "map-human-ubvi.txt" "ogc-human-ubvi.txt
    • "ycl-machine-ubvi.txt" "map-machine-ubvi.txt" "ogc-machine-ubvi.txt"
  • For NUV-B-V-I DIAGRAM REGION DEFINITION files:
  • 2x3 files: one file for each of 3 regions (YCL, MAP, OGC), and 2 classification methods (human, machine)
    • "ycl-human-nuvbvi.txt" "map-human-nuvbvi.txt" "ogc-human-nuvbvi.txt"
    • "ycl-machine-nuvbvi.txt" "map-machine-nuvbvi.txt" "ogc-machine-nuvbvi.txt"

DR3 - Catalog Release 1

The catalog files have the following naming convention:

hlsp_phangs-cat_hst_<ins>_<target>_<filter>_<version>_<type>.fits

where:

• <ins> = Name of instrument, either "wfc3" or "acs-wfc3" if both instruments used in the catalog
• <target> = Name of galaxy, e.g., "ngc1566"
• <filter> = "multi", since all the catalogs include data from several filters
• <version> = "v1" for version 1 of the catalogs
• <type> = Type of file:
  • For CLUSTER files:
    • one of "cluster-human-class12.fits" or "cluster-ml-class12.fits"
  • For ASSOC files:
    • At the galaxy level:
      • "assoc-brightstarmask.reg" = circular regions used to eliminate objects around bright stars
    • At the association level:
      • "assoc-<selection band>-<scalepc>-main.fits" = main catalog
      • "assoc-<selection band>-<scalepc>-idmask.fits" = segmentation map
      • "assoc-<selection band>-<scalepc>-peaks.reg" = position of the peak flux in each region
      • "assoc-<selection band>-<scalepc>-region.reg" = DS9 region file showing outline of the region
    • where:
      • <selection band> = wavelength band used for selection, one of "nuvselect" (F275W) or "vselect" (F555W)
      • <scalepc> = the size scale in parsecs used to form associations (one of "ws8pc", "ws16pc", "ws32pc", or "ws64pc", where "ws" stands for "watershed method"

Data file types:

Please remember to cite the appropriate paper(s) below and the DOI if you use these data in a published work. 

Note: These HLSP data products are licensed for use under CC BY 4.0.