Optical emission line properties of eROSITA-selected SDSS-V galaxies

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Volume 702 (October 2025)

A&A, 702 (2025) A67

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Table A.1.

Description of optical emission line properties of eROSITA-selected SDSS-V galaxies.

Column Name	Units	Datatype	Description
plateid		long64	SDSS-V plate ID
mjd	days	long64	Modified Julian Date of the observation
catalogid		long64	SDSS-V catalog ID for target
sdssid		long64	Unique photometric identifier in the SDSS database
specobjid		string	Unique spectrum identifier in the SDSS database
erass1		string	String containing the official IAU name of the eRASS1 source
ra	deg	double	Right ascension (ICRS) for SDSS-V target
dec	deg	double	Declination (ICRS) for SDSS-V target
xra	deg	double	Right ascension (ICRS) from eRASS1
xdec	deg	double	Declination (ICRS) from eRASS1
distance	arcsec	double	Distance between SDSS-V and eRASS1 positions
z		double	Redshift
z_e		double	Redshift uncertainty
z_q		integer	Redshift flag (ZWARNING from SDSS-V)
quality		integer	Quality flag (-1/0/1/2) see Sec. 4.1
mag_u	mag	float	Magnitude in SDSS u filter
mag_g	mag	float	Magnitude in SDSS g filter
mag_r	mag	float	Magnitude in SDSS r filter
mag_i	mag	float	Magnitude in SDSS i filter
mag_z	mag	float	Magnitude in SDSS z filter
err_u	mag	float	Magnitude uncertainty in SDSS u filter
err_g	mag	float	Magnitude uncertainty in SDSS g filter
err_r	mag	float	Magnitude uncertainty in SDSS r filter
err_i	mag	float	Magnitude uncertainty in SDSS i filter
err_z	mag	float	Magnitude uncertainty in SDSS z filter
snr_flux		float	Median SNR of the SDSS-V spectrum
snr_fit		float	Median SNR of the best-fit model
snr_grid		float	Median SNR of the stellar component (E-MILES SSP model)
snr_cont		float	Median SNR at the continuum level (excluded emission lines)
chisqr		float	Reduces χ² statistics for NBURSTS fit
dof		integer	Degree of freedom for NBURSTS fit
vel_ssp	km s⁻¹	float	Radial velocity of stellar component
vel_nlr	km s⁻¹	float	Radial velocity of NLR component
vel_blr	km s⁻¹	float	Radial velocity of BLR component
sig_ssp	km s⁻¹	float	Velocity dispersion of stellar component
sig_nlr	km s⁻¹	float	Velocity dispersion of NLR component
sig_blr	km s⁻¹	float	Velocity dispersion of BLR component
h3_ssp		float	h₃ Gauss-Hermite coefficient of stellar component
h3_nlr		float	h₃ Gauss-Hermite coefficient of NLR component
h3_blr		float	h₃ Gauss-Hermite coefficient of BLR component
h4_ssp		float	h₄ Gauss-Hermite coefficient of stellar component
h4_nlr		float	h₄ Gauss-Hermite coefficient of NLR component
h4_blr		float	h₄ Gauss-Hermite coefficient of BLR component
age	Myr	float	Age of stellar component (E-MILES SSP model)
met	dex	float	Metallicity of stellar component (E-MILES SSP model)
e_vel_ssp	km s⁻¹	float	Radial velocity uncertainty of stellar component
e_vel_nlr	km s⁻¹	float	Radial velocity uncertainty of NLR component
e_vel_blr	km s⁻¹	float	Radial velocity uncertainty of BLR component
e_sig_ssp	km s⁻¹	float	Velocity dispersion uncertainty of stellar component
e_sig_nlr	km s⁻¹	float	Velocity dispersion uncertainty of NLR component
e_sig_blr	km s⁻¹	float	Velocity dispersion uncertainty of BLR component
e_h3_ssp		float	h₃ Gauss-Hermite coefficient uncertainty of stellar component
e_h3_nlr		float	h₃ Gauss-Hermite coefficient uncertainty of NLR component
e_h3_blr		float	h₃ Gauss-Hermite coefficient uncertainty of BLR component
e_h4_ssp		float	h₄ Gauss-Hermite coefficient uncertainty of stellar component
e_h4_nlr		float	h₄ Gauss-Hermite coefficient uncertainty of NLR component
e_h4_blr		float	h₄ Gauss-Hermite coefficient uncertainty of BLR component

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