Search Publications
Significant Dust-obscured Star Formation in Luminous Lyman-break Galaxies at z 7-8
Holwerda, Benne W.; Carniani, Stefano; Maiolino, Roberto +13 more
We make use of Atacama Large Millimeter/submillimeter Array continuum observations of 15 luminous Lyman-break galaxies at z ~ 7-8 to probe their dust-obscured star formation. These observations are sensitive enough to probe obscured star formation rates (SFRs) of 20 M ⊙ yr-1 (3σ). Six of the targeted galaxies show significant…
Reconstructing the Disrupted Dwarf Galaxy Gaia-Sausage/Enceladus Using Its Stars and Globular Clusters
Limberg, Guilherme; Rossi, Silvia; Perottoni, Hélio D. +3 more
We combine spectroscopic, photometric, and astrometric information from APOGEE data release 17 and Gaia early data release 3 to perform a self-consistent characterization of Gaia-Sausage/Enceladus (GSE), the remnant of the last major merger experienced by the Milky Way, considering stars and globular clusters (GCs) altogether. Our novel set of che…
The Sparkler: Evolved High-redshift Globular Cluster Candidates Captured by JWST
Ravindranath, Swara; Willott, Chris J.; Martis, Nicholas S. +16 more
Using data from JWST, we analyse the compact sources ("sparkles") located around a remarkable z spec = 1.378 galaxy (the 'Sparkler) that is strongly gravitationally lensed by the z = 0.39 galaxy cluster SMACS J0723.3-7327. Several of these compact sources can be cross-identified in multiple images, making it clear that they are associat…
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XXIII. Proper-motion Catalogs and Internal Kinematics
Milone, Antonino P.; Vesperini, Enrico; Anderson, Jay +17 more
A number of studies based on the data collected by the Hubble Space Telescope (HST) GO-13297 program "HST Legacy Survey of Galactic Globular Clusters: Shedding UV Light on Their Populations and Formation" have investigated the photometric properties of a large sample of Galactic globular clusters and revolutionized our understanding of their stell…
JWST Imaging of Earendel, the Extremely Magnified Star at Redshift z = 6.2
Ouchi, Masami; Hutchison, Taylor A.; Larson, Rebecca L. +60 more
The gravitationally lensed star WHL 0137-LS, nicknamed Earendel, was identified with a photometric redshift z phot = 6.2 ± 0.1 based on images taken with the Hubble Space Telescope. Here we present James Webb Space Telescope (JWST) Near Infrared Camera images of Earendel in eight filters spanning 0.8-5.0 µm. In these higher-resolu…
The Coma Cluster at LOFAR Frequencies. II. The Halo, Relic, and a New Accretion Relic
Simionescu, A.; Zhang, X.; Brunetti, G. +26 more
We present LOw Frequency ARray observations of the Coma Cluster field at 144 MHz. The cluster hosts one of the most famous radio halos, a relic, and a low surface brightness bridge. We detect new features that allow us to make a step forward in the understanding of particle acceleration in clusters. The radio halo extends for more than 2 Mpc, whic…
Milky Way's Eccentric Constituents with Gaia, APOGEE, and GALAH
Caldwell, Nelson; Myeong, G. C.; Belokurov, Vasily +3 more
We report the results of an unsupervised decomposition of the local stellar halo in the chemodynamical space spanned by the abundance measurements from APOGEE DR17 and GALAH DR3. In our Gaussian mixture model, only four independent components dominate the halo in the solar neighborhood, three previously known, Aurora, Splash, and Gaia-Sausage/Ence…
The X-Ray Polarization View of Mrk 421 in an Average Flux State as Observed by the Imaging X-Ray Polarimetry Explorer
Wu, Kinwah; Enoto, Teruaki; Turolla, Roberto +100 more
Particle acceleration mechanisms in supermassive black hole jets, such as shock acceleration, magnetic reconnection, and turbulence, are expected to have observable signatures in the multiwavelength polarization properties of blazars. The recent launch of the Imaging X-Ray Polarimetry Explorer (IXPE) enables us, for the first time, to use polariza…
The Star Formation Rate of the Milky Way as Seen by Herschel
Martin, P. G.; Paladini, R.; Klessen, R. S. +23 more
We present a new derivation of the Milky Way's current star formation rate (SFR) based on the data of the Herschel InfraRed Galactic Plane Survey (Hi-GAL). We estimate the distribution of the SFR across the Galactic plane from the star-forming clumps identified in the Hi-GAL survey and calculate the total SFR from the sum of their contributions. T…
The Hubble Tension Revisited: Additional Local Distance Ladder Uncertainties
Dhawan, Suhail; Goobar, Ariel; Mörtsell, Edvard +1 more
In a recent paper, we investigated possible systematic uncertainties related to the Cepheid color-luminosity calibration method and their influence on the tension between the Hubble constant as inferred from distances to Type Ia supernovae and the cosmic microwave background as measured with the Planck satellite. Here, we study the impact of other…