SDSS-IV MaNGA : signatures of halo assembly in kinematically misaligned galaxies
Date
11/02/2019Author
Grant ID
ST/K004719/1
ERC-2012-StG-20111012
Keywords
Metadata
Show full item recordAbstract
We investigate the relationship of kinematically misaligned galaxies with their large-scale environment, in the context of halo assembly bias. According to numerical simulations, halo age at fixed halo mass is intrinsically linked to the large-scale tidal environment created by the cosmic web. We investigate the relationship between distances to various cosmic web features and present-time gas accretion rate. We select a sub-sample of ∼900 central galaxies from the MaNGA survey with defined global position angles (PA; angle at which velocity change is greatest) for their stellar and Hα gas components up to a minimum of 1.5 effective radii (Re). We split the sample by misalignment between the gas and stars as defined by the difference in their PA. For each central galaxy we find its distance to nodes and filaments within the cosmic web, and estimate the host halo’s age using the central stellar mass to total halo mass ratio M*/Mh. We also construct halo occupation distributions using a background subtraction technique for galaxy groups split using the central galaxy’s kinematic misalignment. We find, at fixed halo mass, no statistical difference in these properties between our kinematically aligned and misaligned galaxies. We suggest that the lack of correlation could be indicative of cooling flows from the hot halo playing a far larger role than ‘cold mode’ accretion from the cosmic web or a demonstration that the spatial extent of current large-scale integral field unit (IFU) surveys hold little information about large-scale environment extractable through this method.
Citation
Duckworth , C , Tojeiro , R , Kraljic , K , Sgró , M A , Wild , V , Weijmans , A-M , Lacerna , I & Drory , N 2019 , ' SDSS-IV MaNGA : signatures of halo assembly in kinematically misaligned galaxies ' , Monthly Notices of the Royal Astronomical Society , vol. 483 , no. 1 , pp. 172–188 . https://doi.org/10.1093/mnras/sty3101
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
ISSN
0035-8711Type
Journal article
Rights
© 2018, the Author(s). This work has been made available online in accordance with the publisher's policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1093/mnras/sty3101
Description
Funding: RT acknowledges support from the Science and Technology Facilities Council via an Ernest Rutherford Fellowship (grant number ST/K004719/1). VW acknowledges support of the European Research Council via the award of a starting grant (SED-Morph; P.I. V. Wild).Collections
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