The data for SKYSURF-5: Probing the Integrated Galaxy Light with a SDSS-SKYSURF Cross-Matched Catalog
Creators
- 1. BASIS Scottsdale HS
-
2.
Arizona State University
Description
The SKYSURF Project (Windhorst et al. 2022) analyzes the extragalactic background light (both directly using sky background measurements and indirectly using galaxy counts) using the HST Archive. While HST images probe faint galaxies unseen by ground-based imaging, its small field of view prevents it from probing the large-scale structure around its observations.
To supplement SKYSURF analysis, we cross-match SKYSURF pointings with SDSS observations able to probe the surrounding large-scale environment (Bhatia et al. 2024). The tables in this database include galaxies brighter than r=22.5 AB mag photometrically identified in SDSS, within +/-5 arcmin around a SKYSURF pointing.
The tables in the Object_AB directory include information on all SDSS objects, organized by the HST camera and filter of the central pointing.
The tables in the IGL directory include the total galaxy counts and integrated galaxy light (down to AB mag=22.5) for all SDSS objects surrounding a given SKYSURF image.
Notes
Column Descriptions for Object_AB tables
| ra, dec | Position of SDSS Object |
| objid | SDSS photometric object identification number |
| u, g, r, i, z | SDSS model magnitude corrected for Milky Way extinction |
| err_u, err_g, err_r, err_i, err_z | 1-sigma uncertainty in corresponding u, g, r, i, or z magnitude |
| type_u, type_g, type_r, type_i, type_z | SDSS Object Type |
| flags_u, flags_g, flags_r, flags_i, flags_z | SDSS Photometric Flag |
| ok_u, ok_g, ok_r, ok_i, ok_z | 1 if flags_* value is good; 0 if flags_* value is bad |
| fiber2Mag_u, fiber2Mag_g, fiber2Mag_r, fiber2Mag_i, fiber2Mag_z | Magnitude in central 2 arcseconds |
| Image Names | SKYSURF images for which this object is associated with (within 5 arcminutes) |
| Datasets | SKYSURF datasets for which this object is associated |
Notes
Column Descriptions for IGL tables
| Image Name | SKYSURF Image Name |
| RA, Dec | Position of the center of the SKYSURF image |
| # of Objects | Number of SDSS galaxies (ABmag<22.5) in that image |
| # of Bright Objects | Number of bright (ABmag<18) SDSS galaxies in that image |
| Search Area | Area of SDSS search (+/- 5 arcmin in RA and Dec) |
| Object Density | Number of galaxies per square arcminute (# of Occurences/ Image Area) |
| Total u/g/r/i/z-band IGL | Total IGL (down to AB mag=22.5) for the corresponding SDSS filter (u, g, r, i, or z) |
Files
SKYSURF_SDSS_Crossmatch.zip
Files
(1.1 GB)
| Name | Size | Download all |
|---|---|---|
|
md5:d7edf3846a903d9364d090123129b9bb
|
566.2 MB | Preview Download |
|
md5:bde6e6ec5dd4ae06eb2a8aeadb9db89d
|
565.3 MB | Preview Download |
Additional details
Funding
- Space Telescope Science Institute
- SKYSURF AR-15810
Dates
- Available
-
2024-05-30