Revisiting the globular clusters of NGC 1052-DF2
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F25%3A00141867" target="_blank" >RIV/00216224:14310/25:00141867 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1051/0004-6361/202452454" target="_blank" >https://doi.org/10.1051/0004-6361/202452454</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/0004-6361/202452454" target="_blank" >10.1051/0004-6361/202452454</a>
Alternative languages
Result language
angličtina
Original language name
Revisiting the globular clusters of NGC 1052-DF2
Original language description
The ultra-diffuse galaxy (UDG) NGC 1052-DF2 has captured the interest of astronomers ever since the low velocity dispersion measured from ten globular clusters (GCs) suggested a low dark matter fraction. Also, its GC system was found to be unusually bright, with a GC luminosity function peak at least one magnitude brighter than expected for a galaxy at a distance of 20 Mpc. In this work we present an updated view of the GC system of NGC 1052-DF2. We analysed archival MUSE data of NGC 1052-DF2 to confirm the membership of four additional GCs based on their radial velocities, thereby raising the number of spectroscopically confirmed GCs to 16. We measured the ages and metallicities of 11 individual GCs, finding them to be old (> 9 Gyr) and with a range of metallicities from [M/H] = −0.7 to −1.8 dex. The majority of GCs are found to be more metal-poor than the host galaxy, with some metal-rich GCs sharing the metallicity of the host ([M/H] = −1.09−0.07+0.09 dex). The host galaxy shows a flat age and metallicity gradient out to 1 Re. Using a distance measurement based on the internal GC velocity dispersions (D = 16.2 Mpc), we derived photometric GC masses and find that the peak of the GC mass function compares well with that of the Milky Way. From updated GC velocities, we estimated the GC system velocity dispersion of NGC 1052-DF2 with a simple kinematic model and find σGCS = 14.86−2.83+3.89 km s−1. However, this value is reduced to σGCS = 8.63−2.14+2.88 km s−1 when the GC that has the highest relative velocity based on a low S/N spectrum is considered an interloper. We discuss the possible origin of NGC 1502-DF2, taking the lower distance, spread in GC metallicities, flat stellar population profiles, and dynamical mass estimate into consideration.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
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Continuities
S - Specificky vyzkum na vysokych skolach
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astronomy and Astrophysics
ISSN
0004-6361
e-ISSN
1432-0746
Volume of the periodical
697
Issue of the periodical within the volume
May
Country of publishing house
FR - FRANCE
Number of pages
13
Pages from-to
1-13
UT code for WoS article
001488693800005
EID of the result in the Scopus database
2-s2.0-105005512497