TY - JOUR
T1 - Looking into the faintEst WIth MUSE (LEWIS)
T2 - Exploring the nature of ultra-diffuse galaxies in the Hydra-I cluster: I. Project description and preliminary results
AU - Iodice, Enrichetta
AU - Hilker, Michael
AU - Doll, Goran
AU - Mirabile, Marco
AU - Buttitta, Chiara
AU - Hartke, Johanna
AU - Mieske, Steffen
AU - Cantiello, Michele
AU - D'Ago, Giuseppe
AU - Forbes, Duncan A.
AU - Gullieuszik, Marco
AU - Rejkuba, Marina
AU - Spavone, Marilena
AU - Spiniello, Chiara
AU - Arnaboldi, Magda
AU - Corsini, Enrico M.
AU - Greggio, Laura
AU - Falcón-Barroso, Jesus
AU - Fahrion, Katja
AU - Fritz, Jacopo
AU - La Marca, Antonio
AU - Paolillo, Maurizio
AU - Angela Raj, Maria
AU - Rampazzo, Roberto
AU - Sarzi, Marc
AU - Capasso, Giulio
N1 - Publisher Copyright:
© The Author(s), 2023.
PY - 2023/11
Y1 - 2023/11
N2 - Looking into the faintEst WIth MUSE (LEWIS) is an ESO large observing programme that aims at obtaining the first homogeneous integral-field spectroscopic survey of 30 extremely low-surface-brightness (LSB) galaxies in the Hydra I cluster of galaxies with MUSE at ESO-VLT. The majority of LSB galaxies in the sample (22 in total) are ultra-diffuse galaxies (UDGs). Data acquisition started in December 2021 and is expected to be concluded by March 2024. Up to June 2023, 29 targets were observed and the redshift has been derived for 20 of them. The distribution of systemic velocities Vsys ranges between 2317 km s1 and 5198 km s1 and is centred on the mean velocity of Hydra I (Vsys=3683±46 km s1). Considering the mean velocity and the velocity dispersion of the cluster (cluster 700 km s1), 17 out of 20 targets are confirmed cluster members. The three objects with velocities of greater than 2cluster away from the cluster mean velocity could be two background galaxies and one foreground galaxy. To assess the quality of the data and demonstrate the feasibility of the science goals, we report the preliminary results obtained for one of the sample galaxies, UDG11. For this target, we (i) derived the stellar kinematics, including the two-dimensional maps of line-of-sight velocity and velocity dispersion, (ii) constrained age and metallicity, and (iii) studied the globular cluster (GC) population hosted by the UDG. Results are compared with the available measurements for UDGs and dwarf galaxies in the literature. By fitting the stacked spectrum inside one effective radius, we find that UDG11 has a velocity dispersion of =20±8 km s1 and is old (10±1 Gyr), metal-poor ([M/H]=1.17±0.11 dex), and has a total dynamical mass-to-light ratio of M/LV 14, which is comparable to those observed for classical dwarf galaxies. The spatially resolved stellar kinematics maps suggest that UDG11 does not show a significant velocity gradient along either its major or minor photometric axis, and the average value of the velocity dispersion is.
AB - Looking into the faintEst WIth MUSE (LEWIS) is an ESO large observing programme that aims at obtaining the first homogeneous integral-field spectroscopic survey of 30 extremely low-surface-brightness (LSB) galaxies in the Hydra I cluster of galaxies with MUSE at ESO-VLT. The majority of LSB galaxies in the sample (22 in total) are ultra-diffuse galaxies (UDGs). Data acquisition started in December 2021 and is expected to be concluded by March 2024. Up to June 2023, 29 targets were observed and the redshift has been derived for 20 of them. The distribution of systemic velocities Vsys ranges between 2317 km s1 and 5198 km s1 and is centred on the mean velocity of Hydra I (Vsys=3683±46 km s1). Considering the mean velocity and the velocity dispersion of the cluster (cluster 700 km s1), 17 out of 20 targets are confirmed cluster members. The three objects with velocities of greater than 2cluster away from the cluster mean velocity could be two background galaxies and one foreground galaxy. To assess the quality of the data and demonstrate the feasibility of the science goals, we report the preliminary results obtained for one of the sample galaxies, UDG11. For this target, we (i) derived the stellar kinematics, including the two-dimensional maps of line-of-sight velocity and velocity dispersion, (ii) constrained age and metallicity, and (iii) studied the globular cluster (GC) population hosted by the UDG. Results are compared with the available measurements for UDGs and dwarf galaxies in the literature. By fitting the stacked spectrum inside one effective radius, we find that UDG11 has a velocity dispersion of =20±8 km s1 and is old (10±1 Gyr), metal-poor ([M/H]=1.17±0.11 dex), and has a total dynamical mass-to-light ratio of M/LV 14, which is comparable to those observed for classical dwarf galaxies. The spatially resolved stellar kinematics maps suggest that UDG11 does not show a significant velocity gradient along either its major or minor photometric axis, and the average value of the velocity dispersion is.
KW - Galaxies: clusters: individual: Hydra I
KW - Galaxies: dwarf
KW - Galaxies: formation
KW - Galaxies: kinematics and dynamics
KW - Galaxies: stellar content
UR - http://www.scopus.com/inward/record.url?scp=85181015111&partnerID=8YFLogxK
U2 - 10.1051/0004-6361/202347129
DO - 10.1051/0004-6361/202347129
M3 - Article
AN - SCOPUS:85181015111
SN - 0004-6361
VL - 679
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
M1 - A69
ER -