Mission Overview

Sloan Digital Sky Survey Giant Arcs Survey ("SGAS")

 

Primary Investigator: Keren Sharon

HLSP Authors: Guillaume Mahler, Michael Florian, Keren Sharon

Released: 2022-03-22

Updated: 2022-03-22

Primary Reference(s): Sharon et al. 2020

DOI: 10.17909/t9-cqtj-y020

Citations: See ADS Statistics

Read Me

Source Data:

 
Example images showing lens from SGAS clusters.
Example images showing lenses from SGAS clusters.

Overview

Strong gravitational lensing models for 37 galaxy clusters from the Sloan Digital Sky Survey Giant Arcs Survey (SGAS) are made available as an HLSP, observed by HST GO13003 Cycle 20 large program (PI: Gladders). The lens models are constructed based on multi-band HST WFC3 imaging. The team supplemented these imaging data with ground-based imaging and spectroscopy from Magellan, Gemini, Apache Point Observatory, and the Multiple Mirror Telescope, in order to detect and spectroscopically confirm new multiply imaged lensed background sources behind the clusters. In the paper that accompanies this data release, Sharon et al. (2020), the team report the list of lensing constraints, and spectroscopic or photometric redshifts of sources in these fields, including cluster galaxies and background sources. The strong lensing mass models are constructed based on all available lensing evidence.

The HLSP include lens model outputs (kappa, gamma) for the best-optimized model and a range of maps drawn from sets in the MCMC that sample the parameter space, from which one can derive lens model properties such as cluster masses, magnification, deflection, and their uncertainties. The models were produced using the parametric lens modeling LENSTOOL (Jullo et al. 2007). The team refers the user to Sharon et al. (2020) for detailed information on the construction of the lens models, assessment of the quality of each model, and caveats. The team cautions the user that the derived lens models span a wide range of quality, which depends on the availability of constraints and the limitations due to lensing geometry. Users should consult the paper before making use of any model product.

Data Products

Image Files

The image files have the following naming convention:

hlsp_sgas_hst_<ins>-30mas_<target>_<filter>_v1_<type>-sci.fits

where:

  • <ins> = Instrument used, either "wfc3" or "wfpc2".
  • <target> = Name of cluster, e.g., "sdssj2111m0114".
  • <filter> = Name of filter, e.g., "f814w".
  • <type> = Type of drizzled image, "drz" is drizzled, "drc" is drizzled and CTE-corrected.

Model Files

Best-optimized gamma and kappa files are available inside each cluster's "models/v1/" folder.  These models have the following naming convention:

hlsp_sgas_model_model_<target>_sharon_v1_<type>.fits

where:

  • <target> = Name of cluster, e.g., "sdssj2111m0114".

  • <type> = Type of model file, either "gamma" or "kappa".

Sample gamma and kappa models, selected at equal intervals throughout the MCMC chain, are available in a "range/" subdirectory in each cluster's "models/v1/" folder. The sample lens models have the following naming convention:

hlsp_sgas_model_model_<target>_sharon-map<####>_v1_<type>.fits

where:

  • <target> = Name of cluster, e.g., "sdssj2111m0114".

  • map<####> = MCMC sampling models, ranging from 0000 to 0999, e.g., "map0004".

  • <type> = Type of model file, either "gamma" or "kappa".

Data file types:

_drz.fits Drizzled image.
_drc.fits Drizzled, CTE-corrected image.
_gamma.fits Shear maps normalized at DLS/DS = 1.
_kappa.fits Mass surface density ("convergence") maps normalized at DLS/DS=1.

Data Access

 

Bulk Download All Image Files

If you would like to download all the image files from SGAS (excluding the gamma and kappa maps), you can use this bulk download script: hlsp_sgas_model_model_all_sharon_v1_image-dl.sh.  Note the total size of the images is approximately 33 GB.

Cluster File Name

 

Sharon et al. 2020 Name

("SDSS ")

WFC3
F390W
WFPC2
F450W
WFC3
F475W
WFC3
F606W
WFPC2
F606W
WFC3
F775W
WFC3
F814W
WFPC2
F814W
WFC3
F105W
WFC3
F110W
WFC3
F125W
WFC3
F160W
Models

J0004M0103

J0004-0103

FITS           FITS       FITS FITS Bulk Script

J0108P0623

J0108+0624

FITS     FITS         FITS     FITS Bulk Script

J0146M0929

J0146-0929

FITS     FITS         FITS     FITS Bulk Script

J0150P2725

J0150+2725

FITS     FITS     FITS         FITS Bulk Script

J0333M0651

J0333-0651

FITS           FITS       FITS FITS Bulk Script

J0851P3331

J0851+3331

FITS           FITS       FITS FITS Bulk Script

J0915P3826

J0915+3826

FITS           FITS       FITS FITS Bulk Script

J0928P2031

J0928+2031

FITS     FITS           FITS   FITS Bulk Script

J0952P3434

J0952+3434

FITS     FITS         FITS     FITS Bulk Script

J0957P0509

J0957+0509

FITS           FITS       FITS FITS Bulk Script

J1038P4849

J1038+484

FITS FITS     FITS     FITS   FITS   FITS Bulk Script

J1050P0017

J1050+0017

FITS     FITS           FITS   FITS Bulk Script

J1055P5547

J1055+5547

                  FITS   FITS Bulk Script

J1110P6459

J1110+6459

FITS     FITS         FITS     FITS Bulk Script

J1115P1645

J1115+1645

FITS           FITS       FITS FITS Bulk Script

J1138P2754

J1138+2754

FITS         FITS       FITS   FITS Bulk Script

J1152P0939

J1152+0930

FITS     FITS         FITS     FITS Bulk Script

J1152P3312

J1152+3313

    FITS FITS           FITS   FITS Bulk Script

J1156P1911

J1156+1911

FITS           FITS       FITS FITS Bulk Script

J1207P5254

J1207+5254

FITS     FITS         FITS     FITS Bulk Script

J1209P2640

J1209+2640

FITS FITS     FITS     FITS FITS     FITS Bulk Script

J1329P2243

J1329+2243

FITS     FITS         FITS     FITS Bulk Script

J1336M0331

J1336-0331

FITS     FITS             FITS FITS Bulk Script

J1343P4155

J1343+4155

FITS FITS     FITS     FITS FITS     FITS Bulk Script

J1420P3955

J1420+3955

FITS     FITS         FITS     FITS Bulk Script

J1439P1208

J1439+1208

FITS           FITS       FITS FITS Bulk Script

J1456P5702

J1456+5702

FITS           FITS       FITS FITS Bulk Script

J1522P2535

J1522+2535

FITS     FITS         FITS     FITS Bulk Script

J1531P3414

J1531+3414

FITS     FITS     FITS         FITS Bulk Script

J1604P2244

J1604+2244

FITS         FITS       FITS   FITS Bulk Script

J1621P0607

J1621+0607

FITS         FITS       FITS   FITS Bulk Script

J1632P3500

J1632+3500

FITS           FITS     FITS   FITS Bulk Script

J1723P3411

J1723+3411

FITS         FITS       FITS   FITS Bulk Script

J2111M0114

J2111-0114

FITS FITS     FITS     FITS   FITS   FITS Bulk Script

J2243M0935

J2243-0935

FITS FITS   FITS FITS     FITS FITS     FITS Bulk Script

Citations

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.

References