TY - JOUR
T1 - SDSS-V black hole mapper
T2 - the index diagram as a tool to disentangle the influence of the host galaxy in quasar spectra
AU - Negrete, C. A.
AU - Sandoval-Orozco, R.
AU - Ibarra-Medel, H.
AU - Tapia-Benavides, B. I.
AU - Assef, R. J.
AU - Dultzin, D.
AU - Lacerna, I.
AU - Morrison, S.
AU - Anderson, S. F.
AU - Rodríguez Hidalgo, P.
AU - Aydar, C.
AU - Bauer, F. E.
AU - Benitez, E.
AU - Bizyaev, D.
AU - Brandt, W. N.
AU - Brownstein, J. R.
AU - Buchner, J.
AU - Cruz-González, I.
AU - González-Buitrago, D.
AU - Hernández-Toledo, H.
AU - Jenaro-Ballesteros, N.
AU - Koekemoer, A.
AU - Krongold, Y.
AU - Martínez-Aldama, M. L.
AU - Pan, K.
AU - Ricci, C.
AU - Salvato, M.
AU - Sánchez, S. F.
AU - Serrano-Félix, D.
AU - Schneider, D. P.
AU - Sniegowska, M.
AU - Trakhtenbrot, B.
AU - Wu, Q.
AU - Wylezalek, D.
AU - Yang, Q.
AU - Zermeño, R. J.
N1 - Publisher Copyright:
© The Author(s) 2025. Published by Oxford University Press on behalf of Royal Astronomical Society.
PY - 2025/11/1
Y1 - 2025/11/1
N2 - We revisit the Quasar Main Sequence (QMS) by investigating the impact of the stellar component from the host galaxy (HG) on the emission line spectra of the active galactic nuclei (AGNs). We first detect spectra with broad emission lines using a line ratio method for a sample of ∼3000 high SNR ( > 20) black hole mapper objects (part of the fifth phase of the Sloan Digital Sky Survey). We then built the Index diagram, a novel diagnostic tool using the z-corrected spectra, model-free, designed to easily identify spectra with significant stellar HG contributions and to classify the AGN spectra into three categories based on AGN–HG dominance: HG-dominated (HGD), Intermediate (INT), and AGN-dominated (AGND) sources. A colour- z diagram was used to refine the AGN–HG classification. We subtract the stellar contributions from the HGD and INT spectra before modelling the AGN spectrum to extract the QMS parameters. Our QMS reveals that HGD galaxies predominantly occupy the Population B region with no RFe II , with outliers exhibiting RFe II > 1, likely due to HG subtraction residuals and a faint contribution of H βBC . INT and AGND spectra show similar distributions in the Population A region, while in Population B, a tail of AGND sources becomes apparent. Cross-matching with radio, infrared, and X-ray catalogues, we find that the strongest radio emitters are associated with HGD and INT groups. Strong X-ray emitters are found in INT and AGND sources, also occupying the AGN region in the Wide-field Infrared Survey Explorer colour diagram.
AB - We revisit the Quasar Main Sequence (QMS) by investigating the impact of the stellar component from the host galaxy (HG) on the emission line spectra of the active galactic nuclei (AGNs). We first detect spectra with broad emission lines using a line ratio method for a sample of ∼3000 high SNR ( > 20) black hole mapper objects (part of the fifth phase of the Sloan Digital Sky Survey). We then built the Index diagram, a novel diagnostic tool using the z-corrected spectra, model-free, designed to easily identify spectra with significant stellar HG contributions and to classify the AGN spectra into three categories based on AGN–HG dominance: HG-dominated (HGD), Intermediate (INT), and AGN-dominated (AGND) sources. A colour- z diagram was used to refine the AGN–HG classification. We subtract the stellar contributions from the HGD and INT spectra before modelling the AGN spectrum to extract the QMS parameters. Our QMS reveals that HGD galaxies predominantly occupy the Population B region with no RFe II , with outliers exhibiting RFe II > 1, likely due to HG subtraction residuals and a faint contribution of H βBC . INT and AGND spectra show similar distributions in the Population A region, while in Population B, a tail of AGND sources becomes apparent. Cross-matching with radio, infrared, and X-ray catalogues, we find that the strongest radio emitters are associated with HGD and INT groups. Strong X-ray emitters are found in INT and AGND sources, also occupying the AGN region in the Wide-field Infrared Survey Explorer colour diagram.
UR - https://www.scopus.com/pages/publications/105019744930
UR - https://www.scopus.com/pages/publications/105019744930#tab=citedBy
U2 - 10.1093/mnras/staf1711
DO - 10.1093/mnras/staf1711
M3 - Article
AN - SCOPUS:105019744930
SN - 0035-8711
VL - 543
SP - 4272
EP - 4285
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -