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SDSS IV MaNGA: full spectroscopic bulge-disc decomposition of MaNGA early-type galaxies

Tabor, Martha; Merrifield, Michael; Arag�n-Salamanca, Alfonso; Fraser-Mckelvie, Amelia; Peterken, Thomas; Smethurst, Rebecca; Drory, Niv; Lane, Richard R.


Martha Tabor

Amelia Fraser-Mckelvie

Thomas Peterken

Rebecca Smethurst

Niv Drory

Richard R. Lane


By applying spectroscopic decomposition methods to a sample of MaNGA early-type galaxies, we separate out spatially and kinematically distinct stellar populations, allowing us to explore the similarities and differences between galaxy bulges and discs, and how they affect the global properties of the galaxy. We find that the components have interesting variations in their stellar populations, and display different kinematics. Bulges tend to be consistently more metal rich than their disc counterparts, and while the ages of both components are comparable, there is an interesting tail of younger, more metal-poor discs. Bulges and discs follow their own distinct kinematic relationships, both on the plane of the stellar spin parameter, λR, and ellipticity, ϵ, and in the relation between stellar mass, M*, and specific angular momentum, j*, with the location of the galaxy as a whole on these planes being determined by how much bulge and disc it contains. As a check of the physical significance of the kinematic decompositions, we also dynamically model the individual galaxy components within the global potential of the galaxy. The resulting components exhibit kinematic parameters consistent with those from the spectroscopic decomposition, and though the dynamical modelling suffers from some degeneracies, the bulges and discs display systematically different intrinsic dynamical properties. This work demonstrates the value in considering the individual components of galaxies rather than treating them as a single entity, which neglects information that may be crucial in understanding where, when, and how galaxies evolve into the systems we see today.


Tabor, M., Merrifield, M., Aragón-Salamanca, A., Fraser-Mckelvie, A., Peterken, T., Smethurst, R., …Lane, R. R. (2019). SDSS IV MaNGA: full spectroscopic bulge-disc decomposition of MaNGA early-type galaxies. Monthly Notices of the Royal Astronomical Society, 485(2), 1546–1558.

Journal Article Type Article
Acceptance Date Feb 8, 2019
Online Publication Date Feb 13, 2019
Publication Date May 11, 2019
Deposit Date Feb 13, 2019
Publicly Available Date Feb 13, 2019
Journal MNRAS
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 485
Issue 2
Pages 1546–1558
Keywords galaxies: kinematics and dynamics; galaxies: elliptical and lenticular; galaxies: evolution
Public URL
Publisher URL
Additional Information This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2019 The authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.


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