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sdas_lotss_en1_pros_classifications.md

ELAIS-N1 source classification catalogue (Das et al. 2024)

COLUMN DEFINITIONS

Source identification

Column Units Description
radio_id Unique ID assigned to the source in the radio galaxy catalogue EN1_sedfit_v1.0.fits
sour_id Unique ID assigned to the source in the multiwavelength catalogue en1_optIR_catalogue_full.fits
sour_name Source name
ra RA of optical identification, if any
dec DEC of optical identification, if any
z_best Source redshift (spectroscopic or photometric)
z1_min Lower bound of the primary 80% HPD CI peak
z1_max Upper bound of the primary 80% HPD CI peak
nbands Number of photometric bands with valid flux measurements

Flags used during multiwavelength catalogue creation (Kondapally et al 2021)

Column Units Description
flag_overlap Flag indicating the multi-wavelength coverage region of the optical source position (ALPHAJ2000, DELTAJ2000)
flag_clean Flag indicating bright star masking at the optical source position

AGN flags from prior works (Duncan et al 2021)

Column Units Description
flag_opt_agn Source is included in Million Quasar Catalog compilation or spectroscopically identified AGN
flag_ir_agn Source satisfies Donley et al. (2012) IR AGN criteria
flag_xray_agn Source has X-ray counterpart
flag_agn Sources flagged by any one of optAGN/IRAGN/XrayAGN

LoTSS 150 MHz observations (Sabater et al 2021)

Column Units Description
flux150 Jansky 150 MHz radio flux density
l150 ergs/s 150 MHz radio luminosity
l150_err ergs/s 150 MHz radio luminosity error

Goodness of Prospector fits

Column Units Description
chi2_agn Chi-squared value from Prospector SED fit with AGN templates included in model
chi2_99_agn Accepted fit (including AGN) with chi2_best meeting 99 percent confidence threshold (see Smith et al 2021). 0 is accepted fit, 1 is not.
chi2_noagn Chi-squared value from Prospector SED fit without AGN templates
chi2_99_noagn Accepted fit (not including AGN) with 'chi2_best' meeting 99 percent confidence threshold (see Smith et al 2021). 0 is accepted fit, 1 is not.

Physical parameter estimates from Prospector

Column Units Description
mstar_X* Msol Stellar mass remaining in the galaxy
sfr_X* Msol/year Star formation rate averaged over the recent 100 Myrs
fagn_X* Total luminosity of the AGN defined as a fraction of the total stellar bolometric luminosity

*X : 16, 50, 84 percentile values calculated from the output PDF

Source classifications (this work)

Column Units Description
radiativeagn Radiative mode AGN identified in this work
radioagn Radio-excess AGN identified in this work
galtype** Final source classification

**Refer to the galaxy class definition table at the bottom of this page.

Best et al 2023 source classifications

Column Units Description
b23_mstar Consensus stellar mass from Best et al. 2023
b23_sfr Consensus SFR from Best et al. 2023
b23_chi2_mpbp Minimum of chi2 from Magphys and Bagpipes fits
b23_chi2_afcg Minimum of chi2 from Cigale and AGNFitter fits
b23_cigs_fagn_16 16th percentile AGN fraction from Cigale (Skirtor) fit
b23_afit_fagn_16 16th percentile AGN fraction from AGNFitter fit
b23_radiativeagn_sedfit Our reproduction of Best et al. 2023 radiative-mode AGN classification using their SED-based criteria
b23_radiativeagn Best et al 2023 identified radiative-mode AGN
b23_radioagn Best et al 2023 identified radio-mode AGN
b23_galtype** Final galaxy classification (Best et al. 2023)

**Refer to the galaxy class definition table at the bottom of this page.

GALAXY CLASS DEFINITIONS

Classification Value Definition
Star forming galaxy 1 radiativeAGN = 0 & radioAGN = 0
Radio-quiet AGN 2 radiativeAGN = 1 & radioAGN = 0
Low excitation/jet-mode radio galaxy (LERG) 2 radiativeAGN = 0 & radioAGN = 1
Low excitation/quasar-like radio galaxy (HERG) 3 radiativeAGN = 1 & radioAGN = 1
Unclassified/no secure classification 4 radiativeAGN = -1 & radioAGN = -1