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Milky Way Subsystems from Globular Cluster Kinematics Using Gaia DR2 and HST Data
Bobylev, V. V.; Bajkova, A. T.; Carraro, G. +2 more
We employ Gaia DR2 proper motions for 151 Milky Way globular clusters (GCs) from Vasiliev in tandem with distances and line-of-sight velocities to derive their kinematical properties. To assign clusters to the Milky Way thick disk, bulge, and halo, we follow the approach of Posti et al., who distinguished among different Galactic stellar component…
Investigating the magnetospheric accretion process in the young pre-transitional disk system DoAr 44 (V2062 Oph). A multiwavelength interferometric, spectropolarimetric, and photometric observing campaign
Moutou, C.; Bayo, A.; Donati, J. -F. +13 more
Context. Young stars interact with their accretion disk through their strong magnetosphere.
Aims: We aim to investigate the magnetospheric accretion/ejection process in the young stellar system DoAr 44 (V2062 Oph).
Methods: We monitored the system over several rotational cycles, combining high-resolution spectropolarimetry at both optica…
Modelling X-ray RMS spectra I: intrinsically variable AGNs
Fabian, A. C.; Alston, W. N.; Parker, M. L. +1 more
We present simple XSPEC models for fitting excess variance spectra of active galactic nuclei. Using a simple Monte Carlo approach, we simulate a range of spectra corresponding to physical parameters varying, then calculate the resulting variance spectra. Starting from a variable power law, we build up a set of models corresponding to the different…
Implications of the Gaia sausage for dark matter nuclear interactions
Buch, Jatan; Leung, John Shing Chau; Fan, JiJi
The advent of the Gaia era has led to potentially revolutionary understanding of dark matter (DM) dynamics in our galaxy, which has important consequences for direct detection (DD) experiments. In this paper, we study how the empirical DM velocity distribution inferred from Gaia-sausage, a dominant substructure in the solar neighborhood, affects t…
A Catalog of RV Variable Star Candidates from LAMOST
Liu, Gaochao; Wu, Yaqian; Xiang, Maosheng +14 more
Radial velocity (RV) variable stars are important in astrophysics. The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) spectroscopic survey has provided ∼6.5 million stellar spectra in its Data Release 4 (DR4). During the survey ∼4.7 million unique sources were targeted and ∼1 million stars observed repeatedly. The probabilities…
Turbulence and Energetic Particles in Radiative Shock Waves in the Cygnus Loop. I. Shock Properties
Blair, William P.; Slavin, Jonathan D.; Raymond, John C. +3 more
We have obtained a contiguous set of long-slit spectra of a shock wave in the Cygnus Loop to investigate its structure, which is far from the morphology predicted by 1D models. Proper motions from Hubble Space Telescope images combined with the known distance to the Cygnus Loop provide an accurate shock speed. Earlier analyses of shock spectra est…
Recurring Homologous Solar Eruptions in NOAA AR 11429
Zhang, Jie; Vemareddy, Panditi; Karna, Nishu +1 more
We present the study of three homologous solar eruptions from NOAA active region (AR) 11429 over four days. This large and complex AR is divided into two relatively simple subregions: northeast (NE) and southwest (SW). Recurrent eruptions occurred from the SW subregion over different evolutionary phases, which provided a unique opportunity to isol…
Spectroscopic Constraints on the Buildup of Intracluster Light in the Coma Cluster
van Dokkum, Pieter; Bizyaev, Dmitry; Pan, Kaike +14 more
The stellar content of the intracluster light (ICL) provides unique insight into the hierarchical assembly process of galaxy clusters. We present optical spectra of three ICL regions (µg ≈ 25.3-26.2 mag arcsec-2) in the Coma cluster, located between 100 and 180 kpc from their nearest brightest cluster galaxies (BCGs): N…
The spatial evolution of young massive clusters. II. Looking for imprints of star formation in NGC 2264 with Gaia DR2
Hacar, Álvaro; Buckner, Anne S. M.; Khorrami, Zeinab +12 more
Context. Better understanding of star formation in clusters with high-mass stars requires rigorous dynamical and spatial analyses of star-forming regions.
Aims: We seek to demonstrate that "INDICATE" is a powerful spatial analysis tool which when combined with kinematic data from Gaia DR2 can be used to probe star formation history in a robus…
Very wide companion fraction from Gaia DR2: A weak or no enhancement for hot Jupiter hosts, and a strong enhancement for contact binaries
Zakamska, Nadia L.; Schlaufman, Kevin C.; Hwang, Hsiang-Chih +1 more
There is an ongoing debate on whether hot Jupiter hosts are more likely to be found in wide binaries with separations of ≳100 AU. In this paper, we search for comoving, very wide companions with separations of 103-104 AU for hot Jupiter hosts and main-sequence contact binaries in Gaia DR2, and compare the very wide companion …