St Andrews Research Repository

St Andrews University Home
View Item 
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  •   St Andrews Research Repository
  • University of St Andrews Research
  • University of St Andrews Research
  • University of St Andrews Research
  • View Item
  • Login
JavaScript is disabled for your browser. Some features of this site may not work without it.

SDSS IV MaNGA : characterizing non-axisymmetric motions in galaxy velocity fields using the Radon transform

Thumbnail
View/Open
Stark_2018_SDSSIV_Characterizing_MNRAS_2217.pdf (5.687Mb)
Date
21/10/2018
Author
Stark, David V.
Bundy, Kevin A.
Westfall, Kyle
Bershady, Matt
Weijmans, Anne-Marie
Masters, Karen L.
Kruk, Sandor
Brinchmann, Jarle
Soler, Juan
Abraham, Roberto
Cheung, Edmond
Bizyaev, Dmitry
Drory, Niv
Roman Lopes, Alexandre
Law, David R.
Funder
The Leverhulme Trust
Grant ID
ECF-2014-767
Keywords
Methods: data analysis
Galaxies: kinematics and dynamics
QB Astronomy
QC Physics
DAS
Metadata
Show full item record
Altmetrics Handle Statistics
Altmetrics DOI Statistics
Abstract
We show how the Radon transform (defined as a series of line integrals through an image at different orientations and offsets from the origin) can be used as a simple, non-parametric tool to characterize galaxy velocity fields, specifically their global kinematic position angles (PAk) and any radial variation or asymmetry in PAk. This method is fast and easily automated, making it particularly beneficial in an era where integral field unit (IFU) and interferometric surveys are yielding samples of thousands of galaxies. We demonstrate the Radon transform by applying it to gas and stellar velocity fields from the first ∼2800 galaxies of the SDSS-IV MaNGA IFU survey. We separately classify gas and stellar velocity fields into five categories based on the shape of their radial PAk profiles. At least half of stellar velocity fields and two-thirds of gas velocity fields are found to show detectable deviations from uniform coplanar circular motion, although most of these variations are symmetric about the centre of the galaxy. The behaviour of gas and stellar velocity fields is largely independent, even when PAk profiles for both components are measured over the same radii. We present evidence that one class of symmetric PAk variations is likely associated with bars and/or oval distortions, while another class is more consistent with warped discs. This analysis sets the stage for more in-depth future studies which explore the origin of diverse kinematic behaviour in the galaxy population.
Citation
Stark , D V , Bundy , K A , Westfall , K , Bershady , M , Weijmans , A-M , Masters , K L , Kruk , S , Brinchmann , J , Soler , J , Abraham , R , Cheung , E , Bizyaev , D , Drory , N , Roman Lopes , A & Law , D R 2018 , ' SDSS IV MaNGA : characterizing non-axisymmetric motions in galaxy velocity fields using the Radon transform ' , Monthly Notices of the Royal Astronomical Society , vol. 480 , no. 2 , pp. 2217-2235 . https://doi.org/10.1093/mnras/sty1991
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/sty1991
ISSN
0035-8711
Type
Journal article
Rights
© 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. This work has been made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/sty1991
Description
Funding: Leverhulme Trust Early Career Fellowship (AW).
Collections
  • University of St Andrews Research
URL
http://adsabs.harvard.edu/abs/2018MNRAS.tmp.1904S
URI
http://hdl.handle.net/10023/15811

Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

Advanced Search

Browse

All of RepositoryCommunities & CollectionsBy Issue DateNamesTitlesSubjectsClassificationTypeFunderThis CollectionBy Issue DateNamesTitlesSubjectsClassificationTypeFunder

My Account

Login

Open Access

To find out how you can benefit from open access to research, see our library web pages and Open Access blog. For open access help contact: openaccess@st-andrews.ac.uk.

Accessibility

Read our Accessibility statement.

How to submit research papers

The full text of research papers can be submitted to the repository via Pure, the University's research information system. For help see our guide: How to deposit in Pure.

Electronic thesis deposit

Help with deposit.

Repository help

For repository help contact: Digital-Repository@st-andrews.ac.uk.

Give Feedback

Cookie policy

This site may use cookies. Please see Terms and Conditions.

Usage statistics

COUNTER-compliant statistics on downloads from the repository are available from the IRUS-UK Service. Contact us for information.

© University of St Andrews Library

University of St Andrews is a charity registered in Scotland, No SC013532.

  • Facebook
  • Twitter