Published December 21, 2025
| Version v1
Dataset
Open
Variable Radio Sources from the First Two Epochs of the VLA Sky Survey
Authors/Creators
- 1. University of Wisconsin-Madison
-
2.
University of Washington
-
3.
University of Wisconsin–Madison
Description
Supplementary data for: "A Census of Variable Radio Sources at 3GHz"
If you make use of this data in your work, we ask that you cite the corresponding paper (Gordon et al. 2026, OJAp, submitted, arXiv: 2508.00976).
Contents
- Table1_variables.fits, a table of variable radio sources found using the first two epochs of VLASS. The electronic version of Table 1 from the associated paper.
- Table5_xIDs.fits, a table of multiwvelength cross IDs for VLASS sources (including variables) whose average brightness across the first two VLASS epochs was > 20 mJy. The electronic version of Table 5 from the associated paper.
- variable_qa_images.tar.gz, a tarball containing the QA images for the 4,124 candidate variable radio sources identified in Section 3.4 of the associated paper. The filename of each image corresponds to the VLASS1QLCIR name of the source in Table 1.
Table Column Definitions
Table 1: Variables
| Column Name | Unit | Description |
| VLASS1QLCIR | - | Name of the source in VLASS Epoch 1 |
| VLASS2QLCIR | - | Name of the source in VLASS Epoch 2 |
| RA | deg | Right ascension of the source |
| Dec | deg | Declination of the source |
| MJD1 | day | MJD of the Epoch 1 observation |
| MJD2 | day | MJD of the Epoch 2 observation |
| dS | mJy | Change in flux between Epoch 1 and 2 |
| e_dS | mJy | Uncertainty in dS |
| meanS | mJy | Mean flux from Epoch 1 and Epoch 2 observations |
| VarSig | - | Significance of variability based on the variability of all sources within that VLASS Tile |
| modidx | - | Modulation index of the variability |
| f_vi | - | Visual inspection flag, sources with f_vi=0 are likely real variable sources |
Table 5: Multiwavelength cross IDs
| Column Name | Unit | Description |
| VLASS1QLCIR | - | Name of the source in VLASS Epoch 1 |
| AllWISE | - | Name of the source in the AllWISE catalog (CDS:II/328) |
| W1mag | mag | W1-band (3.4um) magnitude of the source in AllWISE |
| e_W1mag | mag | Uncertainty in W1mag |
| W2mag | mag | W2-band (4.3um) magnitude of the source in AllWISE |
| e_W2mag | mag | Uncertainty in W2mag |
| W3mag | mag | W3-band (12um) magnitude of the source in AllWISE |
| e_W3mag | mag | Uncertainty in W3mag |
| 4FGL | - | Name of the source (Source_Name) in the 4FGL DR4 catalog (4FGL-DR4) |
| Flux1000 | 1e10 cm^{-2} s^{-1} | Integrated gamma-ray flux between 1 and 1000 GeV |
| e_Flux1000 | 1e10 cm^{-2} s^{-1} | Uncertainty in Flux1000 |
| VariabilityIndex | - | Gamma-ray variability index (> 24.72 is indicitave of variability) |
| zID | - | ID of the source in the optical catalog that z was obtained from (either SDSS16 from CDS:V/154, or ID from CDS:VII/292) |
| z | - | Redshift of the source |
| e_z | - | Uncertainty in z |
Files
Files
(245.3 MB)
| Name | Size | Download all |
|---|---|---|
|
md5:96845fadc00689c38163aeea35c6abc6
|
495.4 kB | Download |
|
md5:877100d0ae72cbb5344139b805cc84b6
|
5.4 MB | Download |
|
md5:542bd049b130719507b65e5797b96d14
|
239.4 MB | Download |
Additional details
Related works
- Is supplement to
- Publication: arXiv:2508.00976 (arXiv)