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Growth of disc-like pseudo-bulges in SDSS DR7 since z = 0.1

Kumar, A and Kataria, SK (2022) Growth of disc-like pseudo-bulges in SDSS DR7 since z = 0.1. In: Monthly Notices of the Royal Astronomical Society, 514 (2). pp. 2497-2512.

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Official URL: https://doi.org/10.1093/mnras/stac1487


Cosmological simulations predict more classical bulges than their observational counterparts in the local Universe. Here, we quantify evolution of the bulges since z = 0.1 using photometric parameters of nearly 39 000 unbarred disc galaxies from SDSS DR7 which are well represented by two components. We adopted a combination of the SCrossed D sign ©rsic index and Kormendy relation to separate classical bulges and disc-like pseudo-bulges. We found that the fraction of pseudo-bulges (classical bulges) smoothly increases (decreases) as the Universe gets older. In the history of the Universe, there comes a point (z ≈ 0.016) when classical bulges and pseudo-bulges become equal in number. The fraction of pseudo-bulges rises with increasing bulge to disc half-light radius ratio until Re/Rhlr ≈ 0.6 suggesting that a concentrated disc is the most favourable place for pseudo-bulge formation. The mean ellipticity of pseudo-bulges is always greater than that of classical bulges and it decreases with decreasing redshift, indicating that the bulges tend to be more axisymmetric with evolution. Also, the massive bulges are progressing towards axisymmetry at steeper rate than the low-mass bulges. There is no tight correlation of bulge SCrossed D sign

Item Type: Journal Article
Publication: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press
Additional Information: The copyright for this article belongs to the Authors.
Keywords: Numerical methods; Photometry, Disc likes; Disk galaxies; Galaxies: photometry; Galaxy evolution; Galaxy:bulge; Method: numerical; Photometrics; Two-component, Galaxies
Department/Centre: Division of Physical & Mathematical Sciences > Joint Astronomy Programme
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 28 Jul 2022 04:52
Last Modified: 28 Jul 2022 04:52
URI: https://eprints.iisc.ac.in/id/eprint/74993

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