Search Publications
Keck Integral-field Spectroscopy of M87 Reveals an Intrinsically Triaxial Galaxy and a Revised Black Hole Mass
Ma, Chung-Pei; Walsh, Jonelle L.; Liepold, Emily R.
The three-dimensional intrinsic shape of a galaxy and the mass of the central supermassive black hole provide key insight into the galaxy's growth history over cosmic time. Standard assumptions of a spherical or axisymmetric shape can be simplistic and can bias the black hole mass inferred from the motions of stars within a galaxy. Here, we presen…
Fractal Aggregates of Submicron-sized Grains in the Young Planet-forming Disk around IM Lup
Ginski, Christian; Tazaki, Ryo; Dominik, Carsten
Despite rapidly growing disk observations, it remains a mystery what primordial dust aggregates look like and what the physical and chemical properties of their constituent grains (monomers) are in young planet-forming disks. Confrontation of models with observations to answer this mystery has been a notorious task because we have to abandon a com…
Sub-millimetre galaxies with Webb. Near-infrared counterparts and multi-wavelength morphology
Brammer, Gabe; Greve, Thomas R.; Gillman, Steven +12 more
We utilised the unprecedented depth and resolution of recent early-release science (ERS) JWST observations to define the near-infrared counterparts of sub-millimetre galaxies (SMGs). We identified 45 SCUBA-2 SMG positions within the Cosmic Evolution Early Release Science (CEERS) survey JWST/NIRCam fields. Through an analysis of multi-wavelength p-…
A close quasar pair in a disk-disk galaxy merger at z = 2.17
Shen, Yue; Oguri, Masamune; Chen, Yu-Ching +7 more
Galaxy mergers produce pairs of supermassive black holes (SMBHs), which may be witnessed as dual quasars if both SMBHs are rapidly accreting. The kiloparsec (kpc)-scale separation represents a physical regime sufficiently close for merger-induced effects to be important1 yet wide enough to be directly resolvable with the facilities curr…
Awesome SOSS: atmospheric characterization of WASP-96 b using the JWST early release observations
MacDonald, Ryan J.; Espinoza, Néstor; Parmentier, Vivien +13 more
The newly operational JWST offers the potential to study the atmospheres of distant worlds with precision that has not been achieved before. One of the first exoplanets observed by JWST in the summer of 2022 was WASP-96 b, a hot Saturn orbiting a G8 star. As a part of the Early Release Observations programme, one transit of WASP-96 b was observed …
The Star Formation History of the Milky Way's Nuclear Star Cluster
Lu, Jessica R.; Morris, Mark R.; Ghez, Andrea M. +6 more
We report the first star formation history study of the Milky Ways nuclear star cluster (NSC), which includes observational constraints from a large sample of stellar metallicity measurements. These metallicity measurements were obtained from recent surveys from Gemini and the Very Large Telescope of 770 late-type stars within the central 1.5 pc. …
Binarity and beyond in A stars - I. Survey description and first results of VLTI/GRAVITY observations of VAST targets with high Gaia-Hipparcos accelerations
Katz, Boaz; Waisberg, Idel; Klein, Ygal
The connection between the multiplicity of A stars and that of their white dwarf (WD) descendants is not known and the observational mappings of both multiplicities are far from complete. We are conducting an interferometric survey with VLTI/GRAVITY of 20 out of 108 southern A stars within the VAST sample which show large Gaia-Hipparcos proper mot…
A Statistical Study of Short-period Decayless Oscillations of Coronal Loops in an Active Region
Long, David M.; Li, Dong
Coronal loop oscillations are common phenomena in the solar corona, which are often classified as decaying and decayless oscillations. Using the high-resolution observation measured by the Extreme Ultraviolet Imager (EUI) on board the Solar Orbiter, we statistically investigate small-scale transverse oscillations with short periods (<200 s) of …
Estimating the selection function of Gaia DR3 subsamples
Casey, Andrew R.; Rix, Hans-Walter; Brown, Anthony G. A. +9 more
Context. Understanding the intricacies behind the presence and absence of sources in an astronomical catalogue is crucial for the accurate interpretation of astronomical data. In particular, for the multi-dimensional Gaia data, filters and cuts on different parameters or measurements introduce a selection function that may unintentionally alter sc…
Limit on Supernova Emission in the Brightest Gamma-Ray Burst, GRB 221009A
Carballo-Bello, Julio A.; Smith, Nathan; Wheeler, J. Craig +30 more
We present photometric and spectroscopic observations of the extraordinary gamma-ray burst (GRB) 221009A in search of an associated supernova. Some past GRBs have shown bumps in the optical light curve that coincide with the emergence of supernova spectral features, but we do not detect any significant light-curve features in GRB 221009A, nor do w…