Skip to content
Back to outputs

Rediscovery of the sixth Star Cluster in the Fornax dwarf spheroidal galaxy

Research output: Contribution to journalArticlepeer-review

Standard

Rediscovery of the sixth Star Cluster in the Fornax dwarf spheroidal galaxy. / Dark Energy Survey Collaboration ; Bacon, David; Thomas, D.

In: Astrophysical Journal Letters, Vol. 875, No. 2, L13, 16.04.2019.

Research output: Contribution to journalArticlepeer-review

Harvard

Dark Energy Survey Collaboration, Bacon, D & Thomas, D 2019, 'Rediscovery of the sixth Star Cluster in the Fornax dwarf spheroidal galaxy', Astrophysical Journal Letters, vol. 875, no. 2, L13. https://doi.org/10.3847/2041-8213/ab14f5

APA

Vancouver

Dark Energy Survey Collaboration, Bacon D, Thomas D. Rediscovery of the sixth Star Cluster in the Fornax dwarf spheroidal galaxy. Astrophysical Journal Letters. 2019 Apr 16;875(2). L13. https://doi.org/10.3847/2041-8213/ab14f5

Author

Dark Energy Survey Collaboration ; Bacon, David ; Thomas, D. / Rediscovery of the sixth Star Cluster in the Fornax dwarf spheroidal galaxy. In: Astrophysical Journal Letters. 2019 ; Vol. 875, No. 2.

Bibtex

@article{4491ae8cebb74f8bb4dc39799ea96759,
title = "Rediscovery of the sixth Star Cluster in the Fornax dwarf spheroidal galaxy",
abstract = "Since first noticed by Shapley in 1939, a faint object coincident with the Fornax dwarf spheroidal has long been discussed as a possible sixth globular cluster system. However, debate has continued over whether this overdensity is a statistical artifact or a blended galaxy group. In this Letter we demonstrate, using deep DECam imaging data, that this object is well resolved into stars and is a bona fide star cluster. The stellar overdensity of this cluster is statistically significant at the level of ~ 6 - 6.7 sigma in several different photometric catalogs including Gaia. Therefore, it is highly unlikely to be caused by random fluctuation. We show that Fornax 6 is a star cluster with a peculiarly low surface brightness and irregular shape, which may indicate a strong tidal influence from its host galaxy. The Hess diagram of Fornax 6 is largely consistent with that of Fornax field stars, but it appears to be slightly bluer. However, it is still likely more metal-rich than most of the globular clusters in the system. Faint clusters like Fornax 6 that orbit and potentially get disrupted in the centers of dwarf galaxies can prove crucial for constraining the dark matter distribution in Milky Way satellites. ",
keywords = "astro-ph.GA, RCUK, STFC",
author = "{Dark Energy Survey Collaboration} and Mei-Yu Wang and Sergey Koposov and Alex Drlica-Wagner and Adriano Pieres and Ting Li and Boer, {Thomas de} and Keith Bechtol and Vasily Belokurov and Pace, {A. B.} and David Bacon and Abbott, {T. M. C.} and J. Annis and E. Bertin and D. Brooks and E. Buckley-Geer and Burke, {D. L.} and Rosell, {A. Carnero} and Kind, {M. Carrasco} and J. Carretero and Costa, {L. N. da} and Vicente, {J. De} and S. Desai and Diehl, {H. T.} and P. Doel and J. Estrada and B. Flaugher and P. Fosalba and J. Frieman and J. Garcia-Bellido and Gerdes, {D. W.} and D. Gruen and Gruendl, {R. A.} and J. Gschwend and G. Gutierrez and Hollowood, {D. L.} and K. Honscheid and B. Hoyle and James, {D. J.} and S. Kent and K. Kuehn and N. Kuropatkin and Maia, {M. A. G.} and Marshall, {J. L.} and F. Menanteau and R. Miquel and Plazas, {A. A.} and E. Sanchez and B. Santiago and V. Scarpine and D. Thomas",
note = "6 pages, 4 figures, 1 table, submitted to ApJL",
year = "2019",
month = apr,
day = "16",
doi = "10.3847/2041-8213/ab14f5",
language = "English",
volume = "875",
journal = "Astrophysical Journal Letters",
issn = "2041-8205",
publisher = "IOP Publishing",
number = "2",

}

RIS

TY - JOUR

T1 - Rediscovery of the sixth Star Cluster in the Fornax dwarf spheroidal galaxy

AU - Dark Energy Survey Collaboration

AU - Wang, Mei-Yu

AU - Koposov, Sergey

AU - Drlica-Wagner, Alex

AU - Pieres, Adriano

AU - Li, Ting

AU - Boer, Thomas de

AU - Bechtol, Keith

AU - Belokurov, Vasily

AU - Pace, A. B.

AU - Bacon, David

AU - Abbott, T. M. C.

AU - Annis, J.

AU - Bertin, E.

AU - Brooks, D.

AU - Buckley-Geer, E.

AU - Burke, D. L.

AU - Rosell, A. Carnero

AU - Kind, M. Carrasco

AU - Carretero, J.

AU - Costa, L. N. da

AU - Vicente, J. De

AU - Desai, S.

AU - Diehl, H. T.

AU - Doel, P.

AU - Estrada, J.

AU - Flaugher, B.

AU - Fosalba, P.

AU - Frieman, J.

AU - Garcia-Bellido, J.

AU - Gerdes, D. W.

AU - Gruen, D.

AU - Gruendl, R. A.

AU - Gschwend, J.

AU - Gutierrez, G.

AU - Hollowood, D. L.

AU - Honscheid, K.

AU - Hoyle, B.

AU - James, D. J.

AU - Kent, S.

AU - Kuehn, K.

AU - Kuropatkin, N.

AU - Maia, M. A. G.

AU - Marshall, J. L.

AU - Menanteau, F.

AU - Miquel, R.

AU - Plazas, A. A.

AU - Sanchez, E.

AU - Santiago, B.

AU - Scarpine, V.

AU - Thomas, D.

N1 - 6 pages, 4 figures, 1 table, submitted to ApJL

PY - 2019/4/16

Y1 - 2019/4/16

N2 - Since first noticed by Shapley in 1939, a faint object coincident with the Fornax dwarf spheroidal has long been discussed as a possible sixth globular cluster system. However, debate has continued over whether this overdensity is a statistical artifact or a blended galaxy group. In this Letter we demonstrate, using deep DECam imaging data, that this object is well resolved into stars and is a bona fide star cluster. The stellar overdensity of this cluster is statistically significant at the level of ~ 6 - 6.7 sigma in several different photometric catalogs including Gaia. Therefore, it is highly unlikely to be caused by random fluctuation. We show that Fornax 6 is a star cluster with a peculiarly low surface brightness and irregular shape, which may indicate a strong tidal influence from its host galaxy. The Hess diagram of Fornax 6 is largely consistent with that of Fornax field stars, but it appears to be slightly bluer. However, it is still likely more metal-rich than most of the globular clusters in the system. Faint clusters like Fornax 6 that orbit and potentially get disrupted in the centers of dwarf galaxies can prove crucial for constraining the dark matter distribution in Milky Way satellites.

AB - Since first noticed by Shapley in 1939, a faint object coincident with the Fornax dwarf spheroidal has long been discussed as a possible sixth globular cluster system. However, debate has continued over whether this overdensity is a statistical artifact or a blended galaxy group. In this Letter we demonstrate, using deep DECam imaging data, that this object is well resolved into stars and is a bona fide star cluster. The stellar overdensity of this cluster is statistically significant at the level of ~ 6 - 6.7 sigma in several different photometric catalogs including Gaia. Therefore, it is highly unlikely to be caused by random fluctuation. We show that Fornax 6 is a star cluster with a peculiarly low surface brightness and irregular shape, which may indicate a strong tidal influence from its host galaxy. The Hess diagram of Fornax 6 is largely consistent with that of Fornax field stars, but it appears to be slightly bluer. However, it is still likely more metal-rich than most of the globular clusters in the system. Faint clusters like Fornax 6 that orbit and potentially get disrupted in the centers of dwarf galaxies can prove crucial for constraining the dark matter distribution in Milky Way satellites.

KW - astro-ph.GA

KW - RCUK

KW - STFC

U2 - 10.3847/2041-8213/ab14f5

DO - 10.3847/2041-8213/ab14f5

M3 - Article

VL - 875

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

SN - 2041-8205

IS - 2

M1 - L13

ER -

ID: 14016275