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SDSS-IV MaNGA: the different quenching histories of fast and slow rotators

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Smethurst_2017_quenching_histories_MNRAS_2679.pdf (1.227Mb)
Date
11/01/2018
Author
Smethurst, R. J.
Masters, K. L.
Lintott, C. J.
Weijmans, A.
Merrifield, M.
Penny, S. J.
Aragón-Salamanca, A.
Brownstein, J.
Bundy, K.
Drory, N.
Law, D. R.
Nichol, R. C.
Keywords
Galaxies: general
Galaxy: photometry
Galaxies: statistics
QB Astronomy
QC Physics
DAS
Metadata
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Abstract
Do the theorised different formation mechanisms of fast and slow rotators produce an observable difference in their star formation histories? To study this we identify quenching slow rotators in the MaNGA sample by selecting those which lie below the star forming sequence and identify a sample of quenching fast rotators which were matched in stellar mass. This results in a total sample of 194 kinematically classified galaxies, which is agnostic to visual morphology. We use u-r and NUV-u colours from SDSS and GALEX and anexisting inference package, STARPY, to conduct a first look at the onset time and exponentially declining rate of quenching of these galaxies. An Anderson-Darling test on the distribution of the inferred quenching rates across the two kinematic populations reveals they are statistically distinguishable (3.2σ). We find that fast rotators quench at a much wider range of rates than slow rotators, consistent with a wide variety of physical processes such as secular evolution, minor mergers, gas accretion and environmentally driven mechanisms. Quenching is more likely to occur at rapid rates (τ ≲ 1 Gyr) for slow rotators, in agreement with theories suggesting slow rotators are formed in dynamically fast processes, such as major mergers. Interestingly, we also find that a subset of the fast rotators quench at these same rapid rates as the bulk of the slow rotator sample. We therefore discuss how the total gas mass of a merger, rather than the merger mass ratio, may decide a galaxy's ultimate kinematic fate.
Citation
Smethurst , R J , Masters , K L , Lintott , C J , Weijmans , A , Merrifield , M , Penny , S J , Aragón-Salamanca , A , Brownstein , J , Bundy , K , Drory , N , Law , D R & Nichol , R C 2018 , ' SDSS-IV MaNGA: the different quenching histories of fast and slow rotators ' Monthly Notices of the Royal Astronomical Society , vol. 473 , no. 2 , pp. 2679-2687 . DOI: 10.1093/mnras/stx2547
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/stx2547
ISSN
0035-8711
Type
Journal article
Rights
© 2017, the Author(s). 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/stx2547
Collections
  • Physics & Astronomy Research
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/12417
http://adsabs.harvard.edu/abs/2018MNRAS.473.2679S

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