The ultra-diffuse galaxy NGC 1052-DF2 with MUSE II. The population of DF2: stars, clusters, and planetary nebulae
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10406198" target="_blank" >RIV/00216208:11320/19:10406198 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=e706yPOIyi" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=e706yPOIyi</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/0004-6361/201834911" target="_blank" >10.1051/0004-6361/201834911</a>
Alternative languages
Result language
angličtina
Original language name
The ultra-diffuse galaxy NGC 1052-DF2 with MUSE II. The population of DF2: stars, clusters, and planetary nebulae
Original language description
NGC 1052-DF2, an ultra-diffuse galaxy (UDG), has been the subject of intense debate. Its alleged absence of dark matter, and the brightness and number excess of its globular clusters (GCs) at an initially assumed distance of 20 Mpc suggest a new formation channel for UDGs. We present the first systematic spectroscopic analysis of the stellar body and the GCs in this galaxy (six previously known and one newly confirmed member) using MUSE at the VLT. Even though NGC 1052-DF2 does not show any spatially extended emission lines, we report the discovery of three planetary nebulae (PNe). We conduct full spectral fitting on the UDG and the stacked spectra of all the GCs. The UDG's stellar population is old, 8.9 +/- 1.5 Gyr; metal poor, [M/H] = -1.07 +/- 0.12; and with little or no a-enrichment. The stacked spectrum of all GCs indicates a similar age of 8.9 +/- 1.8 Gyr, but a lower metallicity of [M/H] = -1.63 +/- 0.09 and a similarly low alpha-enrichment. There is no evidence for a variation in age and metallicity in the GC population with the available spectra. The significantly more metal-rich stellar body with respect to its associated GCs, the age of the population, its metallicity, and its a-enrichment are all in line with other dwarf galaxies. NGC 1052-DF2 thus falls on the same empirical mass metallicity relation as other dwarfs for the full distance range assumed in the literature. We find that both debated distance estimates (13 and 20 Mpc) are similarly likely, given the three discovered PNe.
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
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astronomy & Astrophysics [online]
ISSN
1432-0746
e-ISSN
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Volume of the periodical
625
Issue of the periodical within the volume
květen
Country of publishing house
FR - FRANCE
Number of pages
10
Pages from-to
A77
UT code for WoS article
000468027400002
EID of the result in the Scopus database
2-s2.0-85064401051