Search Publications
A JWST Survey for Planetary Mass Brown Dwarfs in IC 348
Luhman, K. L.; Tremblin, P.; Parker, R. J. +5 more
We have obtained images of the center of the star-forming cluster IC 348 with the James Webb Space Telescope and have identified brown dwarf candidates based on their photometry and point-like flux profiles. Low-resolution spectroscopy has been performed on four promising candidates, three of which have molecular absorption bands that indicate lat…
Uncovering the physical origin of the prominent Lyman-α emission and absorption in GS9422 at z = 5.943
Heintz, Kasper E.; Brammer, Gabriel; Smit, Renske +5 more
We present a comprehensive spectrophotometric analysis of galaxy GS9422 from the JADES GTO survey located at z = 5.943, anomalously showing a simultaneous strong Lyα emission feature and damped Lyα absorption (DLA), based on JWST NIRSpec and NIRCam observations. The best-fit modeling of the spectral energy distribution (SED) reveals a young, low-m…
Circular-ribbon flares and the related activities
Zhang, Qingmin
Solar flares are an impulsive increase of emissions as a result of impetuous release of magnetic free energy. This paper will present the recent progress on circular-ribbon flares (CRFs) and their related activities, including coronal jets, filaments, coronal mass ejections (CMEs), radio bursts, coronal dimmings, and coronal loop oscillations. Owi…
All Puffed Up: Exploring Ultra-diffuse Galaxy Origins Through Galaxy Interactions
Sand, David J.; Jones, Michael G.; Bennet, Paul +5 more
We present new follow-up observations of two ultra-diffuse galaxies (UDGs) selected for their distorted morphologies and tidal features, suggestive of tidal influence. Using Hubble Space Telescope Advanced Camera for Surveys F555W and F814W imaging, we identify 8 ± 2 globular clusters in KUG 0203-Dw1 and 6 ± 2 in KDG 013, abundances typical for no…
Feedback in Emerging Extragalactic Star Clusters, FEAST: The Relation between 3.3 µm Polycyclic Aromatic Hydrocarbon Emission and Star Formation Rate Traced by Ionized Gas in NGC 628
Kotulla, Ralf; Östlin, Göran; Smith, Linda J. +23 more
We present maps of ionized gas (traced by Paα and Brα) and 3.3 µm polycyclic aromatic hydrocarbon (PAH) emission in the nearby spiral galaxy NGC 628, derived from new JWST/NIRCam data from the Feedback in Emerging extrAgalactic Star clusTers (FEAST) survey. With this data, we investigate and calibrate the relation between 3.3 µm PAH em…
Multi-epoch sampling of the radio star population with the Australian SKA Pathfinder
Kaplan, David L.; Lenc, Emil; Pritchard, Joshua +5 more
The population of radio-loud stars has to date been studied primarily through either targeted observations of a small number of highly active stars or wide-field, single-epoch surveys that cannot easily distinguish stellar emission from background extragalactic sources. As a result it has been difficult to constrain population statistics such as t…
The SAGA Survey. V. Modeling Satellite Systems around Milky Way–Mass Galaxies with Updated UNIVERSEMACHINE
Weiner, Benjamin; Geha, Marla; Behroozi, Peter +11 more
Environment plays a critical role in shaping the assembly of low-mass galaxies. Here, we use the UNIVERSEMACHINE (UM) galaxy–halo connection framework and Data Release 3 of the Satellites Around Galactic Analogs (SAGA) Survey to place dwarf galaxy star formation and quenching into a cosmological context. UM is a data-driven forward model that flex…
Growth history and quasar bias evolution at z < 3 from Quaia
Alonso, David; Carron, Julien; Lewis, Antony +4 more
We make use of the Gaia-unWISE quasar catalogue, Quaia, to constrain the growth history out to high redshifts from the clustering of quasars and their cross-correlation with maps of the Cosmic Microwave Background (CMB) lensing convergence. Considering three tomographic bins, centred at redshifts z̅i = [0.69, 1.59, 2.72], we reconstruct …
The Rise of the r-process in the Gaia-Sausage/Enceladus Dwarf Galaxy
Naidu, Rohan P.; Frebel, Anna; Limberg, Guilherme +2 more
Neutron star mergers (NSMs) produce r-process elements after a time-delayed inspiral process. Once a significant number of NSMs are present in a galaxy, r-process elements, such as Eu, are expected to significantly increase with time. Yet, there have been limited observational data in support of Eu increasing within Local Group galaxies. We have o…
High-redshift JWST massive galaxies and the initial clustering of supermassive primordial black holes
Piao, Yun-Song; Huang, Hai-Long; Jiang, Jun-Qian
In this paper, we show that the initial clustering of supermassive primordial black holes (SMPBHs) beyond a Poisson distribution can efficiently enhance the matter power spectrum, and thus the halo mass function. As a result, the population of initially clustered SMPBHs with