Search Publications
A dusty filament and turbulent CO spirals in HD 135344B - SAO 206462
Dong, Ruobing; Baruteau, Clément; Pinte, Christophe +16 more
Planet-disc interactions build up local pressure maxima that may halt the radial drift of protoplanetary dust, and pile it up in rings and crescents. ALMA observations of the HD 135344B disc revealed two rings in the thermal continuum stemming from ~mm-sized dust. At higher frequencies the inner ring is brighter relative to the outer ring, which i…
Extragalactic Magnetism with SOFIA (Legacy Program). I. The Magnetic Field in the Multiphase Interstellar Medium of M51
Beckman, John E.; Tram, Le Ngoc; Hughes, Annie +18 more
The recent availability of high-resolution far-infrared (FIR) polarization observations of galaxies using HAWC+/SOFIA has facilitated studies of extragalactic magnetic fields in the cold and dense molecular disks. We investigate whether any significant structural differences are detectable in the kiloparsec-scale magnetic field of the grand design…
Magnetic Flux and Magnetic Nonpotentiality of Active Regions in Eruptive and Confined Solar Flares
Veronig, Astrid M.; Hou, Yijun; Li, Ting +3 more
With the aim of understanding how the magnetic properties of active regions (ARs) control the eruptive character of solar flares, we analyze 719 flares of Geostationary Operational Environmental Satellite (GOES) class ≥C5.0 during 2010-2019. We carry out the first statistical study that investigates the flare-coronal mass ejection (CME) associatio…
Double- and Triple-line Spectroscopic Candidates in the LAMOST Medium-Resolution Spectroscopic Survey
Fu, Jian-Ning; Hou, Yong-Hui; Li, Chun-qian +3 more
The LAMOST Medium-Resolution Spectroscopic Survey (LAMOST-MRS) provides an unprecedented opportunity for detecting multiline spectroscopic systems. Based on the cross correlation function and successive derivatives, we search for spectroscopic binaries and triples and derive their radial velocities (RVs) from the LAMOST-MRS spectra. A Monte Carlo …
The stellar distribution function and local vertical potential from Gaia DR2
Widrow, Lawrence M.; Li, Haochuan
We develop a novel method to simultaneously determine the vertical potential, force, and stellar z-vz phase space distribution function (DF) in our local patch of the Galaxy. We assume that the Solar Neighbourhood can be treated as a one-dimensional (1D) system in dynamical equilibrium and directly fit the number density in the z-v…
An ALMA Survey of Protoplanetary Disks in Lynds 1641
Fischer, William J.; Calvet, Nuria; Megeath, S. Thomas +8 more
We present ALMA observations of 101 protoplanetary disks within the star-forming region Lynds 1641 in the Orion Molecular Cloud A. Our observations include 1.33 mm continuum emission and spectral windows covering the J = 2-1 transition of 12CO, 13CO, and C18O. We detect 89 protoplanetary disks in the dust continuum…
Multi-point analysis of coronal mass ejection flux ropes using combined data from Solar Orbiter, BepiColombo, and Wind
Möstl, C.; Horbury, T. S.; Baumjohann, W. +15 more
Context. The recent launch of Solar Orbiter and the flyby of BepiColombo opened a brief window during which these two spacecraft, along with the existing spacecraft at L1, were positioned in a constellation that allowed for the detailed sampling of any Earth-directed coronal mass ejection (CME). Fortunately, two such events occurred during this ti…
KiDS-1000: Constraints on the intrinsic alignment of luminous red galaxies
Hoekstra, Henk; Heymans, Catherine; Kuijken, Konrad +11 more
We constrain the luminosity and redshift dependence of the intrinsic alignment (IA) of a nearly volume-limited sample of luminous red galaxies selected from the fourth public data release of the Kilo-Degree Survey (KiDS-1000). To measure the shapes of the galaxies, we used two complementary algorithms, finding consistent IA measurements for the ov…
Which Molecular Cloud Structures Are Bound?
Miville-Deschênes, Marc-Antoine; Heyer, Mark; Evans, Neal J., II +2 more
We analyze surveys of molecular cloud structures defined by tracers ranging from CO J = 1 → 0 through 13CO J = 1 → 0 to dust emission together with NH3 data. The mean value of the virial parameter and the fraction of mass in bound structures depends on the method used to identify structures. Generally, the virial parameter de…
Evidence for Ultra-diffuse Galaxy Formation through Tidal Heating of Normal Dwarfs
Sand, David J.; Jones, Michael G.; Zaritsky, Dennis +5 more
We have followed up two ultra-diffuse galaxies (UDGs), detected adjacent to stellar streams, with Hubble Space Telescope (HST) imaging and H I mapping with the Jansky Very Large Array in order to investigate the possibility that they might have a tidal origin. With the HST F814W and F555W images we measure the globular cluster (GC) counts for NGC …