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A survey for dwarf galaxy remnants around 14 globular clusters in the outer halo

Sollima, A. and Martínez Delgado, D. and Muñoz, R. R. and Carballo-Bello, J. A. and Valls-Gabaud, D. and Grebel, E. K. and Santana, F. A. and Côté, P. and Djorgovski, S. G. (2018) A survey for dwarf galaxy remnants around 14 globular clusters in the outer halo. Monthly Notices of the Royal Astronomical Society, 476 (4). pp. 4814-4829. ISSN 0035-8711. doi:10.1093/mnras/sty539.

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We report the results of a systematic photometric survey of the peripheral regions of a sample of 14 globular clusters in the outer halo of the Milky Way at distances d_(GC) > 25 kpc from the Galactic Centre. The survey is aimed at searching for the remnants of the host satellite galaxies where these clusters could originally have been formed before being accreted on to the Galactic halo. The limiting surface brightness varies within our sample, but reaches μ_(V, lim) = 30–32 mag arcsec^(−2). For only two globular clusters (NGC 7492 and Whiting 1; already suggested to be associated with the Sagittarius galaxy), we detect extended stellar populations that cannot be associated with either the clusters themselves or with the surrounding Galactic field population. We show that the lack of substructures around globular clusters at these Galactocentric distances is still compatible with the predictions of cosmological simulations whereby in the outer halo the Galactic globular cluster system is built up through hierarchical accretion at early epochs.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Martínez Delgado, D.0000-0003-3835-2231
Grebel, E. K.0000-0002-1891-3794
Santana, F. A.0000-0002-4023-7649
Côté, P.0000-0003-1184-8114
Djorgovski, S. G.0000-0002-0603-3087
Alternate Title:A survey for dwarf galaxy remnants around fourteen globular clusters in the outer halo
Additional Information:© 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2018 February 23. Received 2018 February 2; in original form 2017 December 4. Published: 03 March 2018. DMD and EKG gratefully acknowledge support by the Sonderforshungsbereich ‘The Milky Way System’ (SFB 881, especially through subprojects A2 and A8) of the German Research Foundation (DFG). RRM acknowledges partial support from the BASAL PFB-06 project as well as FONDECYT project N°1170364 . JAC-B acknowledges financial support received from the CONICYT-Chile FONDECYT Postdoctoral Fellowship 3160502, from the Ministry for the Economy, Development, and Tourism's Programa Iniciativa Científica Milenio through grant IC120009, awarded to the Millennium Institute of Astrophysics (MAS), and from CONICYT's PCI program through grant DPI20140066. SGD acknowledges a partial support from the NSF grants AST-1313422, AST-1413600, and AST-1518308. This work is based on observations obtained with MegaCam, a joint project of CFHT and CEA/DAPNIA, at the CFHT observing programs 09AF03 (PI: Valls-Gabaud), 09AC07, 09BC02, and 10AC06 (PI: Côté), on data products produced at TERAPIX and the Canadian Astronomy Data Centre, and on data gathered with the 6.5 metre Magellan Telescopes located at Las Campanas Observatory, Chile under the observing program 2010B-0472 (PI: Geha). We warmly thank Michele Bellazzini for useful discussions.
Funding AgencyGrant Number
Deutsche Forschungsgemeinschaft (DFG)SFB 881
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1170364
Consejo Nacional de Ciencia y Tecnología (CONACYT)3160502
Iniciativa Científica Milenio del Ministerio de Economía, Fomento y TurismoIC120009
Consejo Nacional de Ciencia y Tecnología (CONACYT)DPI20140066
Subject Keywords:methods: observational – techniques: photometric – stars: Population II – globular clusters: general – Galaxy: halo – Galaxy: structure
Issue or Number:4
Record Number:CaltechAUTHORS:20180613-105308891
Persistent URL:
Official Citation:A Sollima, D Martínez Delgado, R R Muñoz, J A Carballo-Bello, D Valls-Gabaud, E K Grebel, F A Santana, P Côté, S G Djorgovski; A survey for dwarf galaxy remnants around 14 globular clusters in the outer halo, Monthly Notices of the Royal Astronomical Society, Volume 476, Issue 4, 1 June 2018, Pages 4814–4829,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87062
Deposited By: Tony Diaz
Deposited On:13 Jun 2018 18:15
Last Modified:15 Nov 2021 20:44

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