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HST UV Globular Cluster Survey ("HUGS")

Piotto et al. 2015, AJ, 149, 91 | Nardiello et al. 2018, MNRAS, accepted

Introduction

Description of Data Products

Data Access

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Introduction

The Large Legacy Treasury Program "The HST Legacy Survey of Galactic Globular Clusters: Shedding UV Light on Their Populations and Formation" (GO-13297, PI: G. Piotto, 131 orbits) is a UV-initiative proposal to complement the existing F606W and F814W database of "An ACS Survey of Galactic Globular Cluster" (GO-10775, PI: A. Sarajedini, 134 orbits) by imaging a large sample of clusters through UV/blue WFC3/UVIS filters F275W, F336W and F438W. Because these three filters are sensitive to C, N, and O abundance variations, they allow us to disentangle and characterize multiple populations in globular clusters. Combination of these UV/blue filters with the optical ones also gives the opportunity to measure the helium content of each population.

Our resulting final database contains catalogs and astrometrised stacked images of 56 globular clusters and one open cluster observed during the GO-13297 (PI: Piotto) and the two pilot projects GO-12311 (PI: Piotto) and GO-12605 (PI: Piotto). For each cluster we release 3 catalogs, one for each photometric method adopted. The catalogs contain information on the positions and on the photometry in five bands (F275W, F336W, F438W, F606W, and F814W) of each star found in the cluster field. The catalogs also include membership probability. You can refer to the full collection of HUGS data products using the DOI http://dx.doi.org/10.17909/T9810F.

Description of Data Products

Each cluster is organized into their own subdirectory. Each cluster has multiple files with the following prefix:

hlsp_hugs_hst_<ins>_<targ>_<filt>_v1_<exten>
where:
  • <ins> = instrument name ("acs-wfc", "wfc3-uvis", or "wfc3-uvis-acs-wfc")
  • <targ> = target cluster, e.g., "ngc6791"
  • <filt> = the filter used, e.g., "f606w", or sometimes "multi" for some file types
  • <exteng> = file extension, which correspond to the following:
    • stack-????s.fits: stacked image for a given filter reported to the exposure time of the deepest among the images used to obtain the stacked image
    • catalog-meth?.txt: astro-photometric catalog obtained with a give photometric method
    • cmd.png: example of F275W versus F275W-F336W color-magnitude diagram
    • rgb.tif: RGB image of the cluster obtained with F275W, F336W, F438W stacked images

A mosaic of HUGS clusters.

Data Access

The stack FITS images are available for the different exposure times in the filter columns in the table below. The catalog files for each of the three methods and the color-magnitude diagrams and RGB color images are also available in the table (note the RGB images are large and may take a long time to fully display in your browser). Finally, the last column contains a .tar.gz file with all data products for a given cluster, for those who want to download all the files for a given cluster.

Cluster RA Dec. F275W F336W F435W F438W F606W F814W Catalogs Plots Bundle
NGC 0104 6.023792 -72.081306 348s  225s  10s | 100s    3s | 50s  3s | 50s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 0288 13.188500 -26.582611 400s  350s    41s  10s | 130s  10s | 150s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 0362 15.809417 -70.848778 519s  350s    54s  10s | 150s  10s | 170s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 1261 48.067542 -55.216222 859s  413s    168s  40s | 350s  40s | 360s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 1851 78.528167 -40.046556 1288s  453s    140s  20s | 350s  20s | 350s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 2298 102.247542 -36.005306 981s  350s    136s  20s | 350s  20s | 350s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 2808 138.012917 -64.863500 985s  650s    97s  23s | 360s  23s | 370s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 3201 154.403417 -46.412472 754s  310s    68s  5s | 100s  5s | 100s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 4590 189.866583 -26.744056 696s  305s    60s  12s | 130s  12s | 150s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 4833 194.891333 -70.876500 936s  350s    136s  10s | 150s  10s | 170s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 5024 198.230208 +18.168167 1832s  460s    180s  45s | 340s  45s | 340s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 5053 199.112875 +17.700250 829s  415s    164s  30s | 340s  30s | 340s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 5272 205.548417 +28.377278 415s  350s    42s  12s | 130s  12s | 150s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 5286 206.611708 -51.374250 797s  310s    65s  30s | 350s  30s | 360s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 5466 211.363708 +28.534444 930s  350s    135s  30s | 340s  30s | 350s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 5897 229.351667 -21.010111 926s  350s    140s  25s | 340s  350s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 5904 229.638417 +2.081028 689s  306s    58s  7s | 140s  7s | 140s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 5927 232.002875 -50.673028 668s  310s    66s  30s | 350s  25s | 360s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 5986 236.512500 -37.786417 745s  300s    64s  20s | 350s  20s | 350s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6093 244.260042 -22.976083 855s  657s    85s  10s | 340s  10s | 340s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6101 246.450500 -72.202194 940s  415s    165s  35s | 370s  35s | 340s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6121 245.896750 -26.525750 808s  300s    66s  1s | 25s  1s | 30s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6144 246.807750 -26.023500 748s  304s    61s  25s | 340s  25s | 350s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6171 248.132750 -13.053778 926s  350s    140s  12s | 130s  12s | 150s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6205 250.421833 +36.459861 427s  350s    46s  7s | 140s  7s | 140s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6218 251.809083 -1.948528 790s  306s    66s  4s | 90s  4s | 90s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6254 254.287708 -4.100306 790s  306s    66s  4s | 90s  4s | 90s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6304 258.634375 -29.462028 693s  304s    61s  20s | 340s  20s | 350s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6341 259.280792 +43.135944 707s  304s    59s  7s | 340s  7s | 340s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6352 261.371292 -48.422167 706s  311s    72s  7s | 140s  7s | 150s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6362 262.979125 -67.048333 720s  323s    68s  10s | 130s  10s | 150s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6366 261.934333 -5.079861 795s  305s    62s  10s | 140s  10s | 140s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6388 264.071792 -44.735500 961s  350s    133s  40s | 340s  40s | 350s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6397 265.175375 -53.674333 752s  310s    66s  1s | 15s  1s | 15s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6441 267.554417 -37.051444 929s  350s    128s  45s | 340s  45s | 350s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6496 269.765333 -44.265944 800s  303s    73s  30s | 340s  30s | 350s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6535 270.960458 -0.297639 793s  305s    62s  12s | 130s  12s | 150s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6541 272.009833 -43.714889 758s  300s    66s  8s | 140s  8s | 150s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6584 274.656667 -52.215778 709s  312s    62s  25s | 350s  25s | 360s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6624 275.918792 -30.361028 800s  295s    81s  15s | 350s  15s | 350s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6637 277.846250 -32.348083 923s  350s    130s  18s | 340s  18s | 150s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6652 278.940125 -32.990722 800s  312s    86s  18s | 340s  18s | 340s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6656 279.099750 -23.904750 812s  475s    141s  3s | 55s  3s | 65s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6681 280.803167 -32.292111 800s  294s    83s  10s | 140s  10s | 150s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6715 283.763875 -30.479861 1755s  475s    190s  30s | 340s  7s | 350s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6717 283.775167 -22.701472 687s  313s    60s  10s | 130s  10s | 150s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6723 284.888125 -36.632250 734s  313s    61s  10s | 140s  10s | 150s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6752 287.717125 -59.984556 369s  500s  10s | 380s    2s | 35s  2s | 40s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6779 289.148208 +30.183472 800s  295s    81s  20s | 340s  20s | 350s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6791 290.220833 +37.771667 700s  300s    72s  1s | 50s  1s | 50s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6809 294.998792 -30.964750 822s  294s    66s  4s | 70s  4s | 80s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6838 298.443708 +18.779194 792s  303s    65s  4s | 75s  4s | 80s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6934 308.547375 +7.404472 792s  304s    70s  45s | 340s  45s | 340s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 6981 313.365417 -12.537306 710s  305s    70s  10s | 130s  10s | 150s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 7078 322.493042 +12.167000 700s  350s    65s  15s | 130s  15s | 150s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 7089 323.362583 -0.823250 785s  313s    62s  20s | 340s  20s | 340s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)
NGC 7099 325.092167 -23.179861 725s  303s    65s  7s | 140s  7s | 140s  meth01 |  meth02 |  meth03  CMD: (png)   | RGB: (png, tif) (tar.gz)