Extended stellar substructure surrounding the Boötes I dwarf spheroidal galaxy

T. A. Roderick; A. D. Mackey; H. Jerjen; G. S. Da Costa

doi:10.1093/mnras/stw1541

Extended stellar substructure surrounding the Boötes I dwarf spheroidal galaxy

T. A. Roderick^*, A. D. Mackey, H. Jerjen, G. S. Da Costa

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

Abstract

We present deep stellar photometry of the Boötes I dwarf spheroidal galaxy in g- and i-band filters, taken with the Dark Energy Camera at Cerro Tololo in Chile. Our analysis reveals a large, extended region of stellar substructure surrounding the dwarf, as well as a distinct overdensity encroaching on its tidal radius. A radial profile of the Boötes I stellar distribution shows a break radius indicating the presence of extra-tidal stars. These observations strongly suggest that Boötes I is experiencing tidal disruption, although not as extreme as that exhibited by the Hercules dwarf spheroidal. Combined with revised velocity dispersion measurements from the literature, we see evidence suggesting the need to review previous theoretical models of the Boötes I dwarf spheroidal galaxy.

Original language	English
Pages (from-to)	3702-3713
Number of pages	12
Journal	Monthly Notices of the Royal Astronomical Society
Volume	461
Issue number	4
DOIs	https://doi.org/10.1093/mnras/stw1541
Publication status	Published - 1 Oct 2016

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title = "Extended stellar substructure surrounding the Bo{\"o}tes I dwarf spheroidal galaxy",

abstract = "We present deep stellar photometry of the Bo{\"o}tes I dwarf spheroidal galaxy in g- and i-band filters, taken with the Dark Energy Camera at Cerro Tololo in Chile. Our analysis reveals a large, extended region of stellar substructure surrounding the dwarf, as well as a distinct overdensity encroaching on its tidal radius. A radial profile of the Bo{\"o}tes I stellar distribution shows a break radius indicating the presence of extra-tidal stars. These observations strongly suggest that Bo{\"o}tes I is experiencing tidal disruption, although not as extreme as that exhibited by the Hercules dwarf spheroidal. Combined with revised velocity dispersion measurements from the literature, we see evidence suggesting the need to review previous theoretical models of the Bo{\"o}tes I dwarf spheroidal galaxy.",

keywords = "Galaxies: dwarf, Galaxies: evolution, Galaxies: fundamental parameters, Galaxies: individual: Bo{\"o}tes I",

author = "Roderick, \{T. A.\} and Mackey, \{A. D.\} and H. Jerjen and \{Da Costa\}, \{G. S.\}",

note = "Publisher Copyright: {\textcopyright} 2016 The Authors.",

year = "2016",

month = oct,

day = "1",

doi = "10.1093/mnras/stw1541",

language = "English",

volume = "461",

pages = "3702--3713",

journal = "Monthly Notices of the Royal Astronomical Society",

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publisher = "Oxford University Press ",

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TY - JOUR

T1 - Extended stellar substructure surrounding the Boötes I dwarf spheroidal galaxy

AU - Roderick, T. A.

AU - Mackey, A. D.

AU - Jerjen, H.

AU - Da Costa, G. S.

PY - 2016/10/1

Y1 - 2016/10/1

N2 - We present deep stellar photometry of the Boötes I dwarf spheroidal galaxy in g- and i-band filters, taken with the Dark Energy Camera at Cerro Tololo in Chile. Our analysis reveals a large, extended region of stellar substructure surrounding the dwarf, as well as a distinct overdensity encroaching on its tidal radius. A radial profile of the Boötes I stellar distribution shows a break radius indicating the presence of extra-tidal stars. These observations strongly suggest that Boötes I is experiencing tidal disruption, although not as extreme as that exhibited by the Hercules dwarf spheroidal. Combined with revised velocity dispersion measurements from the literature, we see evidence suggesting the need to review previous theoretical models of the Boötes I dwarf spheroidal galaxy.

AB - We present deep stellar photometry of the Boötes I dwarf spheroidal galaxy in g- and i-band filters, taken with the Dark Energy Camera at Cerro Tololo in Chile. Our analysis reveals a large, extended region of stellar substructure surrounding the dwarf, as well as a distinct overdensity encroaching on its tidal radius. A radial profile of the Boötes I stellar distribution shows a break radius indicating the presence of extra-tidal stars. These observations strongly suggest that Boötes I is experiencing tidal disruption, although not as extreme as that exhibited by the Hercules dwarf spheroidal. Combined with revised velocity dispersion measurements from the literature, we see evidence suggesting the need to review previous theoretical models of the Boötes I dwarf spheroidal galaxy.

KW - Galaxies: dwarf

KW - Galaxies: evolution

KW - Galaxies: fundamental parameters

KW - Galaxies: individual: Boötes I

UR - https://www.scopus.com/pages/publications/84988649797

U2 - 10.1093/mnras/stw1541

DO - 10.1093/mnras/stw1541

M3 - Article

SN - 0035-8711

VL - 461

SP - 3702

EP - 3713

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

Extended stellar substructure surrounding the Boötes I dwarf spheroidal galaxy

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