Search Publications
A hidden population of active galactic nuclei can explain the overabundance of luminous z > 10 objects observed by JWST
Furlanetto, Steven R.; Hegde, Sahil; Wyatt, Michael M.
The first wave of observations with JWST has revealed a striking overabundance of luminous galaxies at early times (z > 10) compared to models of galaxies calibrated to pre-JWST data. Early observations have also uncovered a large population of supermassive black holes (SMBHs) at z > 6. Because many of the high-z objects appear extended, the…
Magnetic Fields in the Central Molecular Zone Influenced by Feedback and Weakly Correlated with Star Formation
Hasegawa, Tetsuo; Gu, Qilao; Liu, Tie +12 more
Magnetic fields of molecular clouds in the central molecular zone (CMZ) have been relatively under-observed at sub-parsec resolution. Here, we report JCMT/POL2 observations of polarized dust emission in the CMZ, which reveal magnetic field structures in dense gas at ∼0.5 pc resolution. The 11 molecular clouds in our sample include two in the weste…
CHEX-MATE: Robust reconstruction of temperature profiles in galaxy clusters with XMM-Newton
Arnaud, M.; Pointecouteau, E.; Pratt, G. W. +25 more
The "Cluster HEritage project with XMM-Newton: Mass Assembly and Thermodynamics at the End point of structure formation" (CHEX-MATE) is a multi-year heritage program to obtain homogeneous XMM-Newton observations of a representative sample of 118 galaxy clusters. The observations are tuned to reconstruct the distribution of the main thermodynamic q…
TRINITY IV: predictions for supermassive black holes at z ≳ 6
Fan, Xiaohui; Aird, James; Yang, Jinyi +7 more
We present predictions for the high-redshift halo-galaxy-supermassive black hole (SMBH) connection from the TRINITY model. Matching a comprehensive compilation of galaxy (0 ≤ z ≤ 13) and SMBH data sets (0 ≤ z ≤ 6.5), TRINITY finds: (1) The number of SMBHs with M• > 109 M⊙ in the observable Universe increases by …
Complex angular structure of three elliptical galaxies from high-resolution ALMA observations of strong gravitational lenses
Vegetti, S.; McKean, J. P.; Fassnacht, C. D. +4 more
The large-scale mass distributions of galaxy-scale strong lenses have long been assumed to be well described by a singular ellipsoidal power-law density profile with external shear. However, the inflexibility of this model could lead to systematic errors in astrophysical parameters inferred with gravitational lensing observables. Here, we present …
Consistency of JWST black hole observations with NANOGrav gravitational wave measurements
Hütsi, Gert; Ellis, John; Fairbairn, Malcolm +3 more
JWST observations have opened a new chapter in supermassive black hole (SMBH) studies, stimulating discussion of two puzzles: the abundance of high-z SMBHs and the fraction of dual active galactic nuclei (AGNs). We argue that the answers to these puzzles may be linked to an interpretation of the data on the nanohertz gravitational waves (GWs) disc…
TOI-544 b: a potential water-world inside the radius valley in a two-planet system
Fridlund, M.; Pallé, E.; Barragán, O. +32 more
We report on the precise radial velocity follow-up of TOI-544 (HD 290498), a bright K star (V = 10.8), which hosts a small transiting planet recently discovered by the Transiting Exoplanet Survey Satellite (TESS). We collected 122 high-resolution High Accuracy Radial velocity Planet Searcher (HARPS) and HARPS-N spectra to spectroscopically confirm…
Spectroscopic identification of rapidly rotating red giant stars in APOKASC-3 and APOGEE DR16
García, Rafael A.; Mathur, Savita; Pinsonneault, Marc H. +6 more
Rotationally enhanced red giant stars are astrophysically interesting but rare. In this paper, we present a catalogue of 3217 active red giant candidates in the APOGEE DR16 (Apache Point Observatory Galactic Evolution Experiment - Data Release 16) survey. We use a control sample in the well-studied Kepler fields to demonstrate a strong relationshi…
A 2.9 hr Periodic Radio Transient with an Optical Counterpart
Strader, Jay; Rea, N.; Chomiuk, Laura +12 more
We present a long-period radio transient (GLEAM-X J0704‑37) discovered to have an optical counterpart, consistent with a cool main-sequence star of spectral type M3. The radio periodicity occurs at the longest period yet found, 2.9 hr, and was discovered in archival low-frequency data from the Murchison Widefield Array. High time resolution observ…
Clumpy star formation and an obscured nuclear starburst in the luminous dusty z = 4 galaxy GN20 seen by MIRI/JWST
Östlin, G.; Güdel, M.; Colina, L. +28 more
Dusty star-forming galaxies emit most of their light at far-infrared to millimeter wavelengths as their star formation is highly obscured. Far-infrared and millimeter observations have revealed their dust, neutral and molecular gas properties. The sensitivity of JWST at rest-frame optical and near-infrared wavelengths now allows the study of the s…