Search Publications
Applying Noether's Theorem to Matter in the Milky Way: Evidence for External Perturbations and Non-steady-state Effects from Gaia Data Release 2
Yanny, Brian; Gardner, Susan; Hinkel, Austin
We apply Noether's theorem to observations of main-sequence stars from the Gaia Data Release 2 archive to probe the matter distribution function of the Galaxy. That is, we examine the axial symmetry of stars at vertical heights z, $0.2\leqslant | z| \leqslant 3\,\mathrm{kpc}$ , to probe the quality of the angular momentum Lz as an integ…
The ALMA Frontier Fields Survey. V. ALMA Stacking of Lyman-Break Galaxies in Abell 2744, Abell 370, Abell S1063, MACSJ0416.1-2403 and MACSJ1149.5+2223
Kneissl, R.; Demarco, R.; Treister, E. +15 more
Context. The Hubble Frontier Fields offer an exceptionally deep window into the high-redshift universe, covering a substantially larger area than the Hubble Ultra-Deep field at low magnification and probing 1-2 mag deeper in exceptional high-magnification regions. This unique parameter space, coupled with the exceptional multi-wavelength ancillary…
The strange case of the peculiar spiral galaxy NGC 5474. New pieces of a galactic puzzle
Cignoni, M.; Tosi, M.; Bellazzini, M. +5 more
We present the first analysis of the stellar content of the structures and substructures identified in the peculiar star-forming galaxy NGC 5474, based on Hubble Space Telescope resolved photometry from the LEGUS survey. NGC 5474 is a satellite of the giant spiral M 101, and it is known to have a prominent bulge that is significantly off-set from …
The nearby spiral density-wave structure of the Galaxy: line-of-sight velocities of the Gaia DR2 main-sequence A, F, G, and K stars
Hou, Li-Gang; Gedalin, Michael; Jiang, Ing-Guey +2 more
Distances and velocities of ≈ 2400 000 main-sequence A, F, G, and K stars are collected from the second data release of ESA's Gaia astrometric mission. This material is analysed to find evidence of radial and azimuthal systematic non-circular motions of stars in the solar neighbourhood on the assumption that the system is subject to spiral density…
Assessing Spectroscopic Binary Multiplicity Properties Using Robo-AO Imaging
Stassun, Keivan G.; Mathieu, Robert D.; Laos, Emily
We present higher-order multiplicity results for 60 solar-type spectroscopic binaries based on 0.75 µm imaging data taken by the robotic adaptive optics (Robo-AO) system at the Kitt Peak 2.1 m telescope. Our contrast curves show sensitivity up to ∼5 mag at ∼1″ separation; at very small separations, we identify candidate companions from image…
Zodiacal light observations and its link with cosmic dust: A review
Lasue, Jeremie; Levasseur-Regourd, Anny-Chantal; Renard, Jean-Baptiste
The zodiacal light is a nightglow mostly visible along the plane of the ecliptic. It represents the background radiation associated with solar light scattered by the tenuous flattened interplanetary cloud of dust particles surrounding the Sun and the planets. It is an interesting subject of study, as the source of the micrometeoroids falling on Ea…
Carbon- and Oxygen-rich Asymptotic Giant Branch (AGB) Stars in the Bulge Asymmetries and Dynamical Evolution (BAaDE) Survey
Morris, Mark R.; Stroh, Michael C.; Sjouwerman, Loránt O. +3 more
Detections of SiO masers from the Bulge Asymmetries and Dynamical Evolution (BAaDE) survey more tightly define the region where Oxygen-rich (O) Asymptotic Giant Branch (AGB) stars reside in multiple infrared (IR) color-color diagrams. Using Midcourse Space eXperiment (MSX) and Two Micron All Sky Survey (2MASS) data along with radio spectra from th…
A kinematically hot population of young stars in the solar neighbourhood
Jeffries, R. D.; Wright, N. J.; Binks, A. S.
In the last three decades several hundred nearby members of young stellar moving groups (MGs) have been identified, but there has been less systematic effort to quantify or characterize young stars that do not belong to previously identified MGs. Using a kinematically unbiased sample of 225 lithium-rich stars within 100 pc, we find that only 50 ± …
Systematic errors in dust mass determinations: insights from laboratory opacity measurements
Fanciullo, Lapo; Kemper, Francisca; Scicluna, Peter +2 more
The thermal emission of dust is one of the most important tracers of the interstellar medium: multiwavelength photometry in the far-infrared (FIR) and submillimetre (submm) can be fitted with a model, providing estimates of the dust mass. The fit results depend on the assumed value for FIR/submm opacity, which in most models - due to the scarcity,…
Searching for solar siblings in APOGEE and Gaia DR2 with N-body simulations
Bovy, Jo; Mackereth, J. Ted; Hunt, Jason A. S. +4 more
We make use of APOGEE and Gaia data to identify stars that are consistent with being born in the same association or star cluster as the Sun. We limit our analysis to stars that match solar abundances within their uncertainties, as they could have formed from the same giant molecular cloud (GMC) as the Sun. We constrain the range of orbital action…