Kavli Affiliate: Claudio Ricci
| First 5 Authors: Nadiia G. Pulatova, Nadiia G. Pulatova, , ,
| Summary:
We present and discuss optical emission line properties obtained from the
analysis of Sloan Digital Sky Survey (SDSS) spectra for an X-ray selected
sample of 3684 galaxies (0.002 < z < 0.55), drawn from the eRASS1 catalog. We
modeled SDSS-V DR19 spectra using the NBursts full spectrum fitting technique
with E-MILES simple stellar populations (SSP) models and emission line
templates to decompose broad and narrow emission line components for
correlation with X-ray properties. We place the galaxies on the
Baldwin-Phillips-Terlevich (BPT) diagram to diagnose their dominant excitation
mechanism. We show that the consistent use of the narrow component fluxes
shifts most galaxies systematically and significantly upward to the active
galactic nuclei (AGN) region on the BPT diagram. On this basis, we confirm the
dependence between a galaxys position on the BPT diagram and its (0.2-2.3 keV)
X-ray/H$alpha$ flux ratio. We also verified the correlation between X-ray
luminosity and emission line luminosities of the narrow [Oiii]$lambda 5007$
and broad H$alpha$ component; as well as the relations between the
Supermassive Black Hole (SMBH) mass, the X-ray luminosity, and the velocity
dispersion of the stellar component ($sigma_*$) on the base on the unique
sample of optical spectroscopic follow-up of X-ray sources detected by eROSITA.
These results highlight the importance of emission line decomposition in AGN
classification and refine the connection between X-ray emission and optical
emission line properties in galaxies.
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