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  Dwarf galaxies and cluster environments

Hashimoto, Y., Henry, J. P., & Boehringer, H. (2019). Dwarf galaxies and cluster environments. In E. R. Griffin (Ed.), Dwarf Galaxies: From the Deep Universe to the Present (pp. 373-376). Cambridge, UK: Cambridge University Press.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-839C-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-839D-6
Genre: Conference Paper

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Dwarf Galaxies and Cluster Environments - iau.pdf (Any fulltext), 356KB
 
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 Creators:
Hashimoto, Yasuhiro, Author
Henry, J. Patrick, Author
Boehringer, Hans1, Author              
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: We report an investigation of the properties of dwarf galaxies (Mr < -15) inside 26 clusters at z = 0.15 – 0.25, using the X-ray data from the Chandra archive, and optical images taken with Subaru Suprime-Cam. Our results include: 1. Investigation of the dwarf galaxy density distribution is sensitive to the background galaxies and the choice of colour selection of galaxies. 2. Cluster-centric dwarf-to-giant ratio is highly sensitive to the level of subtracted background galaxies. 3. A certain fraction of faint galaxies always remain undetected by the detection algorithm near the center of clusters, even after carefully treating the halo or extra diffuse light created by bright galaxies. The number of ‘undetected’ faint galaxies varies significantly from cluster to cluster, and even from pointing to pointing. 4. Dwarf galaxies extend up to 2 Mpc from the center in most clusters. Meanwhile, the distribution of blue dwarf galaxies extends more to the outside. 5. For a given colour, the spatial distributions of dwarf galaxies and giant galaxies become similar. Namely, the most of the radial distribution comes from the colour, rather than the size, of galaxies. 6. Relative to the NFW profile, all of the galaxy populations are showing a deficit near the cluster core (r < 0.3 Mpc). 7. The dwarf-to-giant ratio shows no variation against cluster measures such as the richness and X-ray luminosity, as well as various cluster X-ray characteristics related to possible dynamical status of clusters.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1017/S1743921318006890
Other: LOCALID: Reihe: IAU...344, p.373
 Degree: -

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Title: 344nd Symposium of the International Astronomical Union
Place of Event: Vienna, Austria
Start-/End Date: 2018-08-20 - 2018-08-24

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Title: Dwarf Galaxies: From the Deep Universe to the Present
Source Genre: Proceedings
 Creator(s):
Griffin, Elizabeth R., Editor
Affiliations:
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Publ. Info: Cambridge, UK : Cambridge University Press
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 373 - 376 Identifier: ISBN: 9781108471619

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Title: Proceedings of the International Astronomical Union
Source Genre: Series
 Creator(s):
International Astronomical Union, Editor              
Affiliations:
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Publ. Info: Cambridge, UK : Cambridge University Press
Pages: - Volume / Issue: 14/S344 Sequence Number: - Start / End Page: - Identifier: ISSN: 1743-9213