Search Publications
Dwarf galaxies in the MATLAS Survey: Hubble Space Telescope observations of the globular cluster systems of 74 ultra-diffuse galaxies
Müller, Oliver; Duc, Pierre-Alain; Lim, Sungsoon +7 more
Ultra-diffuse galaxies (UDGs), characterised by their low surface brightness and large physical size, constitute a subclass of dwarf galaxies that challenge our current understanding of galaxy formation and evolution. In this paper, we probe the properties of 74 UDGs, identified in the MATLAS survey, based on a comprehensive study of their globula…
The robustness in identifying and quantifying high-redshift bars using JWST observations
Ho, Luis C.; Fang, Taotao; Yu, Si-Yue +1 more
Understanding the methodological reliability in identifying and quantifying high-redshift bars is essential for studying their evolution with the James Webb Space Telescope (JWST). We used nearby spiral galaxies to generate simulated images at various resolutions and signal-to-noise ratios, and obtained the simulated galaxy images observed in the …
OCCASO. V. Chemical-abundance trends with Galactocentric distance and age
Jordi, C.; Casamiquela, L.; Anders, F. +12 more
Context. Open clusters provide valuable information on stellar nucleosynthesis and the chemical evolution of the Galactic disk, as their age and distances can be measured more precisely with photometry than in the case of field stars.
Aims: Our aim is to study the chemical distribution of the Galactic disk using open clusters by analyzing the…
Galaxy archaeology for wet mergers: Globular cluster age distributions in the Milky Way and nearby galaxies
Forbes, Duncan A.; McKenzie, Madeleine; Remus, Rhea-Silvia +1 more
Context. Identifying past wet merger activity in galaxies has been a longstanding issue in extragalactic formation history studies. Gaia's 6D kinematic measurements in our Milky Way (MW) have vastly extended the possibilities for Galactic archaeology, leading to the discovery of a multitude of early mergers in the MW's past. As recent work has est…
A 3D view of multiple populations' kinematics in Galactic globular clusters
Dalessandro, E.; Fanelli, C.; Origlia, L. +8 more
We present the first 3D kinematic analysis of multiple stellar populations (MPs) in a representative sample of 16 Galactic globular clusters (GCs). For each GC in the sample, we studied the MP line-of-sight, plane-of-the-sky and 3D rotation, and velocity distribution anisotropy. The differences between first-population (FP) and second-population (…
Photometric binaries in 14 Magellanic Cloud star clusters
Milone, Antonino P.; Lagioia, Edoardo P.; Marino, Anna F. +7 more
Binary stars play a major role in determining the dynamic evolution of star clusters. We used images collected with the Hubble Space Telescope to study fourteen star clusters of the Magellanic Clouds that span an age interval between ∼0.6 and 2.1 Gyr and masses of 104 − 105 M⊙. We estimated the fraction of binary s…
A search for high-redshift direct-collapse black hole candidates in the PEARLS north ecliptic pole field
Finkelstein, Steven L.; Grogin, Norman A.; Koekemoer, Anton M. +33 more
Direct-collapse black holes (DCBHs) of mass ∼104 − 105 M⊙ that form in HI-cooling halos in the early Universe are promising progenitors of the ≳109 M⊙ supermassive black holes that fuel observed z ≳ 7 quasars. Efficient accretion of the surrounding gas onto such DCBH seeds may render them suff…
Disentangling the association of PAH molecules with star formation. Insights from the James Webb Space Telescope and from the UltraViolet Imaging Telescope
Mathew, Blesson; Kartha, Sreeja S.; Subramanian, Smitha +4 more
Context. Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous complex molecules in the interstellar medium and are used as an indirect indicator of star formation. On the other hand, the ultraviolet (UV) emission from young massive stars directly traces the star formation activity in a galaxy. The James Webb Space Telescope (JWST), along with th…
JWST MIRI and NIRCam observations of NGC 891 and its circumgalactic medium
Saintonge, Amélie; Gordon, Karl D.; Sandstrom, Karin M. +37 more
We present new JWST observations of the nearby, prototypical edge-on, spiral galaxy NGC 891. The northern half of the disk was observed with NIRCam in its F150W and F277W filters. Absorption is clearly visible in the mid-plane of the F150W image, along with vertical dusty plumes that closely resemble the ones seen in the optical. A ∼10 × 3 kpc
Unveiling [C II] clumps in a lensed star-forming galaxy at z ∼ 3.4
Rodighiero, G.; Zanella, A.; Mainieri, V. +15 more
Context. Observations at UV and optical wavelengths have revealed that galaxies at z ∼ 1 − 4 host star-forming regions, dubbed "clumps", which are believed to form due to the fragmentation of gravitationally unstable, gas-rich disks. However, the detection of the parent molecular clouds that give birth to such clumps is still possible only in a mi…