DOI: 10.5281/zenodo.14979710
title: The data for ZTF IC 10 variable catalog

description: Catalogs are in either csv file, or Astropy QTable ecsv format.



ZTF r band catalog: df_zr.csv / t_zr_20250225.ecsv

ZTF g band catalog: df_zg.csv/ t_zg_20250225.ecsv

color catalog: df_color.csv / t_color_0912.ecsv


Scheme for df_[band].csv, also see Table 4 in the Jin & Gelfand 2025:




Label
Units 
Explanations


SourceID
---
Source ID for this lightcurve/OID. OIDs with less than 1'' have the same SourceID


filter
---
ZTF filter, either zr for r band or zg for g band


OID
---
ZTF Object ID. Each OID has a lightcurve and makes up a row in this paper's catalog


RA
deg
Right ascension, from ZTF (J2000)


DEC
deg
Declination, from ZTF (J2000)


numobs
---
Number of observations by ZTF, or number of points of this lightcurve


sf
---
The S_k_({chi}^2^), survival function of the constant magnitude model, to classify variable vs. non-variable


FAP
---
False alarm probability from Lomb-Scargle, to classify periodic variable vs. non-periodic variable


period
d
Period at Lomb-Scargle periodogram peak power. Period of the source if the source is periodic


period_w
d
Period at window function peak power


power
---
Lomb-Scargle periodogram peak power


power_w
---
Window function power 


mean
mag
Mean magnitude


std
mag
Standard deviation of magnitudes


min
mag
Minimum magnitude


max
mag
Maximum magnitude


upsilon_class
---
Classification label from UPSILoN


upsilon_prob
---
Classification probability from UPSILoN


upsilon_flag
---
Suspicious classification flag by UPSILoN


upsilon_period
d
Period found by UPSILoN


identifier
---
SIMBAD database identifier of the nearest (if there is any) match within 2''


dist
arcsec
Angular distance between ZTF location and SIMBAD location of the nearest match


type
---
SIMBAD object type of the nearest match


Gaia_count
---
Number of Gaia objects within 2'' radius


multiflag
---
If there is possible contamination from multiple unresolved sources, see Section 4.4


GaiaDist
arcsec
Angular distance between ZTF location and Gaia location of the brightest match


fluxratio
---
Gaia G band flux of brightest Gaia match over that of second brightest Gaia match


Gmag
mag
Gaia G band magnitude


Plx
mas
Parallax of the brightest Gaia match


e_Plx
mas
Error in parallax of the brightest Gaia match


Plxflag
---
If the source is outside IC 10, 1=outside, 0=inside.


RUWE
---
Renormalised Unit Weight Error of the brightest Gaia match


XMM
---
Number of XMM objects 


XMM_dist
arcsec
Angular distance between between ZTF location and XMM location 


Chandra
---
Number of Chandra objects


Chandra_dist
arcsec
Angular distance between between ZTF location and Chandra location


inside_flag
---
If the source is within the 25{sigma} overdensed region. See Section 4.5


ic10_flag
---
If the source is likely to be inside IC 10, with Plxflag=0 and inside-flag=1. See Section 4.5


lc_var
---
Classification of this lightcurve/OID. P = periodic variable, V = non-periodic variable, N = non-variable.


var
---
Classification of this source, P/V/N


var_flag
---
suspect flag, see Section 3.3 




 

Scheme for df_color.csv, note that only sources have both zr and zg observations are included:




Label
Units
Explanations


SourceID
---
Source ID for this lightcurve/OID. OIDs with less than 1'' have the same SourceID.


mean_color
mag
Mean g-r color


std_color
mag
Standard deviation of g-r color


max_color
mag
Maximum g-r color


min_color
mag
Minimum g-r color


mean_mag_r
mag
Mean r band magnitude


std_mag_r
mag
Standard deviation of r band magnitude


max_mag_r
mag
Maximum r band magnitude


min_mag_r
mag
Minimum r band magnitude


mean_mag_g
mag
Mean g band magnitude


std_mag_g
mag
Standard deviation of g band magnitude


max_mag_g
mag
Maximum g band magnitude


min_mag_g
mag
Minimum g band magnitude


var
---
Classification of this source. P = periodic variable, V = non-periodic variable, N = non-variable.


Plxflag
---
If the source is outside IC 10, 1=outside, 0=inside.


ic10_flag
---
If the source is likely to be inside IC 10, with Plxflag=0 and inside-flag=1. See Section 4.5


type
---
SIMBAD object type of the nearest match


XMM
---
Number of XMM objects 


Chandra
---
Number of Chandra objects


intrinsic_mag_r
mag
Intrinsic r band apparent magnitude for IC 10 sources, corrected for extinction and reddening of IC 10. See Section 5.1. 


intrinsic_color
mag
g-r color calculated with  intrinsic apparent magnitudes


absolute_mag_r
mag
Absolute r band magnitude, converted from intrinsic apparent magnitudes according to its parallax (foreground sources) or IC 10 distance (IC 10 sources).