Search Publications
An all-sky proper-motion map of the Sagittarius stream using Gaia DR2
Jordi, C.; Anders, F.; Helmi, A. +4 more
Aims: We aim to measure the proper motion along the Sagittarius stream, which is the missing piece in determining its full 6D phase space coordinates.
Methods: We conduct a blind search of over-densities in proper motion from the Gaia second data release in a broad region around the Sagittarius stream by applying wavelet transform techni…
Chemical Evolution in the Milky Way: Rotation-based Ages for APOGEE-Kepler Cool Dwarf Stars
van Saders, Jennifer L.; García, Rafael A.; Claytor, Zachary R. +5 more
We use models of stellar angular momentum evolution to determine ages for ∼500 stars in the APOGEE-Kepler Cool Dwarfs sample. We focus on lower-main-sequence stars, where other age-dating tools become ineffective. Our age distributions are compared to those derived from asteroseismic and giant samples and solar analogs. We are able to recover gyro…
The Magellanic Corona as the key to the formation of the Magellanic Stream.
Bland-Hawthorn, J.; Lucchini, S.; D'Onghia, E. +3 more
The dominant gaseous structure in the Galactic halo is the Magellanic Stream, an extended network of neutral and ionized filaments surrounding the Large and Small Magellanic Clouds (LMC/SMC), the two most massive satellite galaxies of the Milky Way. Recent observations indicate that the Clouds are on their first passage around our Galaxy, the Stre…
Primordial black holes and oscillating gravitational waves in slow-roll and slow-climb inflation with an intermediate noninflationary phase
Wu, Puxun; Yu, Hongwei; Fu, Chengjie
We propose a new single field inflation model in which the usual slow-roll inflation is joined to a new period of slow-climb and slow-roll inflation through a short intermediate noninflationary phase. We then show that primordial curvature perturbations can be enhanced at small scales, a sizable amount of primordial black holes (PBHs) can be produ…
Cosmological constraints from galaxy-lensing cross-correlations using BOSS galaxies with SDSS and CMB lensing
Mandelbaum, Rachel; Seljak, Uroš; Slosar, Anže +2 more
We present cosmological parameter constraints based on a joint modelling of galaxy-lensing cross-correlations and galaxy clustering measurements in the SDSS, marginalizing over small-scale modelling uncertainties using mock galaxy catalogues, without explicit modelling of galaxy bias. We show that our modelling method is robust to the impact of di…
The ALPINE-ALMA [CII] survey. Circumgalactic medium pollution and gas mixing by tidal stripping in a merging system at z ∼ 4.57
Maiolino, R.; Schaerer, D.; Béthermin, M. +25 more
We present ALMA observations of a merging system at z ∼ 4.57, observed as a part of the ALMA Large Program to INvestigate [CII] at Early times (ALPINE) survey. Combining ALMA [CII]158 µm and far-infrared continuum data with multi-wavelength ancillary data, we find that the system is composed of two massive (M⋆ ≳ 1010 M<…
CLEAR. II. Evidence for Early Formation of the Most Compact Quiescent Galaxies at High Redshift
Papovich, Casey; Finkelstein, Steven L.; Cleri, Nikko J. +11 more
The origin of the correlations between mass, morphology, quenched fraction, and formation history in galaxies is difficult to define, primarily due to the uncertainties in galaxy star formation histories (SFHs). SFHs are better constrained for higher redshift galaxies, observed closer to their formation and quenching epochs. Here we use "nonparame…
Microwave Spectral Imaging of an Erupting Magnetic Flux Rope: Implications for the Standard Solar Flare Model in Three Dimensions
Reeves, Katharine K.; Chen, Bin; Yu, Sijie +1 more
We report microwave spectral imaging observations of an erupting magnetic flux rope during the early impulsive phase of the X8.2-class limb flare on 2017 September 10, obtained by the Expanded Owens Valley Solar Array. A few days prior to the eruption, when viewed against the disk, the flux rope appeared as a reverse S-shaped dark filament along t…
Multiwavelength Variability of BL Lacertae Measured with High Time Resolution
Chen, W. P.; Villata, M.; Carnerero, M. I. +54 more
In an effort to locate the sites of emission at different frequencies and physical processes causing variability in blazar jets, we have obtained high time-resolution observations of BL Lacertae over a wide wavelength range: with the Transiting Exoplanet Survey Satellite (TESS) at 6000-10000 Å with 2 minute cadence; with the Neil Gehrels Swift sat…
Wide binaries are rare in open clusters
Kraus, A. L.; Deacon, N. R.
The population statistics of binary stars are an important output of star formation models. However, populations of wide binaries evolve over time due to interactions within a system's birth environment and the unfolding of wide, hierarchical triple systems. Hence, the wide binary populations observed in star-forming regions or OB associations may…