Search Publications
Quasiperiodic Behavior in the γ-Ray Light Curve of the Blazar PKS 0405-385
Gong, Yunlu; Yuan, Min; Yi, Tingfeng +3 more
We analyze the quasiperiodic oscillation (QPO) of the historical light curve of flat-spectrum radio quasars PKS 0405-385 detected by the Fermi Large Area Telescope from 2008 August to 2021 November. To identify and determine the QPO signal of PKS 0405-385 in the γ-ray light curve, we use four time series analysis techniques based on frequency and …
Constraints on the Galactic Centre environment from Gaia hyper-velocity stars
Rossi, E. M.; Marchetti, T.; Evans, F. A.
Following a dynamical encounter with Sgr A*, binaries in the Galactic Centre (GC) can be tidally separated and one member star ejected as a hyper-velocity star (HVS) with a velocity beyond the escape speed of the Milky Way. As GC-born objects located in more observationally accessible regions of the sky, HVSs offer insight into the stellar populat…
What Are Those Tiny Things? A First Study of Compact Star Clusters in the SMACS0723 Field with JWST
Brammer, Gabriel; Toft, Sune; Faisst, Andreas L. +1 more
We use the unprecedented resolution and depth of the JWST NIRCam Early Release Observations at 1-5 µm to study the stellar mass, age, and metallicity of compact star clusters in the neighborhood of the host galaxies in the SMACS J0723.3-7327 galaxy cluster field at z = 0.39. The measured colors of these star clusters show a similar distribut…
MICROSCOPE's constraint on a short-range fifth force
Bergé, Joel; Pernot-Borràs, Martin; Uzan, Jean-Philippe +5 more
The MICROSCOPE experiment was designed to test the weak equivalence principle in space, by comparing the low-frequency dynamics of cylindrical 'free-falling' test masses controlled by electrostatic forces. We use data taken during technical sessions aimed at estimating the electrostatic stiffness of MICROSCOPE's sensors to constrain a short-range …
A Library of Synthetic X-Ray Spectra for Fitting Tidal Disruption Events
Wen, Sixiang; Jonker, Peter G.; Stone, Nicholas C. +2 more
We present a tabulated version of our slim-disk model for fitting tidal disruption events (TDEs). We create a synthetic X-ray spectral library by ray-tracing stationary general relativistic slim disks and including gravitational redshift, Doppler, and lensing effects self-consistently. We introduce the library to reduce computational expense and i…
Discovery of Extended Structure Around Open Cluster COIN-Gaia 13 Based on Gaia EDR3
Chen, Li; Zhong, Jing; Li, Jing +2 more
COIN-Gaia 13 is a newly discovered open cluster revealed by Gaia DR2 data. It is a nearby open cluster with a distance of about 513 pc. Combined with the five-dimensional astrometric data of Gaia EDR3 with higher accuracy, we use the membership assignment algorithm (pyUPMASK) to determine the membership of COIN-Gaia 13 in a large extended spatial …
Bayesian Solar Wind Modeling with Pulsar Timing Arrays
Ransom, Scott M.; Zhu, Weiwei; Ray, Paul S. +29 more
Using Bayesian analyses we study the solar electron density with the NANOGrav 11 yr pulsar timing array (PTA) data set. Our model of the solar wind is incorporated into a global fit starting from pulse times of arrival. We introduce new tools developed for this global fit, including analytic expressions for solar electron column densities and open…
The structure of accreted stellar streams
Bovy, Jo; Qian, Yansong; Arshad, Yumna
Many of the Milky Way's globular clusters are likely accreted from satellite galaxies that have long since merged with the Milky Way. When these globular clusters are susceptible to tidal disruption, this process likely starts already inside the parent satellite leading to an early stellar stream within the satellite. When the parent satellite mer…
The Perkins INfrared Exosatellite Survey (PINES) I. Survey Overview, Reduction Pipeline, and Early Results
Muirhead, Philip S.; Theissen, Christopher; Bardalez Gagliuffi, Daniella C. +9 more
We describe the Perkins INfrared Exosatellite Survey (PINES), a near-infrared photometric search for short-period transiting planets and moons around a sample of 393 spectroscopically confirmed L- and T-type dwarfs. PINES is performed with Boston University's 1.8 m Perkins Telescope Observatory, located on Anderson Mesa, Arizona. We discuss the ob…
Data-driven, time-dependent modeling of pre-eruptive coronal magnetic field configuration at the periphery of NOAA AR 11726
Kilpua, E. K. J.; Pomoell, J.; Price, D. J. +4 more
Context. Data-driven, time-dependent magnetofrictional modeling has proved to be an efficient tool for studying the pre-eruptive build-up of energy for solar eruptions, and sometimes even the ejection of coronal flux ropes during eruptions. However, previous modeling works have illustrated the sensitivity of the results on the data-driven boundary…