On the scaling relations of bulges and early-type galaxies. (arXiv:2012.12054v2 [astro-ph.GA] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Pastrav_B/0/1/0/all/0/1">Bogdan A. Pastrav</a>
Following from our recent work, we present here a detailed structural
analysis of a representative sample of nearby spiral and early-type galaxies
taken from the KINGFISH/ SINGS survey. The photometric parameters of bulges are
obtained from bulge-disc decompositions using GALFIT data analysis algorithm.
The method and corrections for projection and dust effects previously obtained
are used to derive intrinsic photometric and structural bulge parameters. We
show the main bulge scaling relations and the black hole relations, both
observed and intrinsic ones, in B band. We find dust and inclination effects to
produce more important changes in the parameters of the Kormendy relation for
spiral galaxies, with the respective bulges of late-type galaxies residing on a
steeper slope relation that the early-type galaxies. We observe that the
Kormendy relation in combination with a bulge S'{e}rsic index ($n_{b}$)
threshold, does not produce a conclusive morphological separation of bulges.
The $n_{b}$- bulge-to-total flux ratio ($B/T$) and $B/T$-stellar mass could be
used to discriminate between late-type and early-type galaxies, while a further
use of these parameters to divide bulges with different morphologies is
problematic due to overlaps in the two distributions or large spread in values.
We confirm the existence of two distinct intrinsic relations between the bulge
luminosity (or absolute magnitude) and S'{e}rsic index for late- and
early-type galaxies, while the relations between the black-hole mass ($M_{BH}$)
and bulge luminosity are not found to be statistically different at p<0.05.
Within errors, we find statistically similar intrinsic $M_{BH}-n_{b}$ relations
for all bulges.
Following from our recent work, we present here a detailed structural
analysis of a representative sample of nearby spiral and early-type galaxies
taken from the KINGFISH/ SINGS survey. The photometric parameters of bulges are
obtained from bulge-disc decompositions using GALFIT data analysis algorithm.
The method and corrections for projection and dust effects previously obtained
are used to derive intrinsic photometric and structural bulge parameters. We
show the main bulge scaling relations and the black hole relations, both
observed and intrinsic ones, in B band. We find dust and inclination effects to
produce more important changes in the parameters of the Kormendy relation for
spiral galaxies, with the respective bulges of late-type galaxies residing on a
steeper slope relation that the early-type galaxies. We observe that the
Kormendy relation in combination with a bulge S'{e}rsic index ($n_{b}$)
threshold, does not produce a conclusive morphological separation of bulges.
The $n_{b}$- bulge-to-total flux ratio ($B/T$) and $B/T$-stellar mass could be
used to discriminate between late-type and early-type galaxies, while a further
use of these parameters to divide bulges with different morphologies is
problematic due to overlaps in the two distributions or large spread in values.
We confirm the existence of two distinct intrinsic relations between the bulge
luminosity (or absolute magnitude) and S'{e}rsic index for late- and
early-type galaxies, while the relations between the black-hole mass ($M_{BH}$)
and bulge luminosity are not found to be statistically different at p<0.05.
Within errors, we find statistically similar intrinsic $M_{BH}-n_{b}$ relations
for all bulges.
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