The ultra-diffuse galaxy NGC 1052-DF2 with MUSE II. The population of DF2: stars, clusters, and planetary nebulae

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

The ultra-diffuse galaxy NGC 1052-DF2 with MUSE II. The population of DF2: stars, clusters, and planetary nebulae

Popis výsledku v původním jazyce

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&apos;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.

Název v anglickém jazyce

The ultra-diffuse galaxy NGC 1052-DF2 with MUSE II. The population of DF2: stars, clusters, and planetary nebulae

Popis výsledku anglicky

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&apos;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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Astronomy &amp; Astrophysics [online]

ISSN

1432-0746

e-ISSN

—

Svazek periodika

625

Číslo periodika v rámci svazku

květen

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

10

Strana od-do

A77

Kód UT WoS článku

000468027400002

EID výsledku v databázi Scopus

2-s2.0-85064401051