Search Publications
The metal-poor stellar halo in RAVE-TGAS and its implications for the velocity distribution of dark matter
Lisanti, Mariangela; Herzog-Arbeitman, Jonah; Necib, Lina
The local velocity distribution of dark matter plays an integral role in interpreting the results from direct detection experiments. We previously showed that metal-poor halo stars serve as excellent tracers of the virialized dark matter velocity distribution using a high-resolution hydrodynamic simulation of a Milky Way-like halo. In this paper, …
The Taurus Boundary of Stellar/Substellar (TBOSS) Survey. II. Disk Masses from ALMA Continuum Observations
Pinte, C.; Ménard, F.; van der Plas, G. +9 more
We report 885 µm ALMA continuum flux densities for 24 Taurus members spanning the stellar/substellar boundary with spectral types from M4 to M7.75. Of the 24 systems, 22 are detected at levels ranging from 1.0 to 55.7 mJy. The two nondetections are transition disks, though other transition disks in the sample are detected. Converting ALMA co…
Spectropolarimetric Inversions of the Ca II 8542 Å Line in an M-class Solar Flare
Mathioudakis, M.; Rouppe van der Voort, L.; Carlsson, M. +3 more
We study the M1.9-class solar flare SOL2015-09-27T10:40 UT using high-resolution full Stokes imaging spectropolarimetry of the Ca II 8542 Å line obtained with the CRISP imaging spectropolarimeter at the Swedish 1-m Solar Telescope. Spectropolarimetric inversions using the non-LTE code NICOLE are used to construct semiempirical models of the flarin…
Shedding Light on the Isolation of Luminous Blue Variables
Drout, Maria R.; Aadland, Erin; Massey, Philip +1 more
In the standard view of massive star evolution, luminous blue variables (LBVs) are transitional objects between the most massive O-type stars and Wolf-Rayet (WR) stars. With short lifetimes, these stars should all be found near one another. A recent study of LBVs in the Large Magellanic Cloud (LMC) found instead that LBVs are considerably more iso…
The Effects of Uncertainty in Initial CME Input Parameters on Deflection, Rotation, Bz, and Arrival Time Predictions
Gopalswamy, N.; Kay, C.
Understanding the effects of coronal mass ejections (CMEs) requires knowing if and when they will impact and their properties upon impact. Of particular importance is the strength of a CME's southward magnetic field component (Bz). Kay et al. (2013, https://doi:10.1088/0004-637X/775/1/5
Rotating Stars from Kepler Observed with Gaia DR2
Davenport, James R. A.; Covey, Kevin R.
We have matched the astrometric data from Gaia Data Release 2 to the sample of stars with measured rotation periods from Kepler. Using 30,305 stars with good distance estimates, we select 16,248 as being likely main-sequence single stars centered within a 0.5 mag region about a 1 Gyr isochrone, removing many subgiants and unresolved binary stars f…
The AGN Ionization Cones of NGC 5728. I. Excitation and Nuclear Structure
Durré, Mark; Mould, Jeremy
We explore the gas morphology and excitation mechanisms of the ionization cones of the Type II Seyfert galaxy NGC 5728. Near-IR and optical data from the SINFONI and MUSE integral field units on the Very Large Telescope are combined with Hubble Space Telescope optical images, Chandra X-ray data, and Very Large Array radio observations. The complex…
The Far-infrared Emission of the First Massive Galaxies
Shivaei, Irene; Lyu, Jianwei; Rieke, George H. +2 more
Massive Population II galaxies undergoing the first phase of vigorous star formation after the initial Population III stage should have high energy densities and silicate-rich interstellar dust. We have modeled the resulting far-infrared spectral energy distributions (SEDs), demonstrating that they are shifted substantially to bluer (“warmer”) wav…
ALMA observations of AGN fuelling. The case of PKS B1718-649
Morganti, R.; Emonts, B. H. C.; Oonk, J. B. R. +2 more
We present ALMA observations of the 12CO (2-1) line of the newly born (tradio 102 years) active galactic nucleus (AGN), PKS B1718-649. These observations reveal that the carbon monoxide in the innermost 15 kpc of the galaxy is distributed in a complex warped disk. In the outer parts of this disk, the CO gas follows…
An Evaluation of 10 Lensing Models of the Frontier Fields Cluster MACS J0416.1-2403
Sharon, K.; Mahler, G.; Remolina González, J. D.
Galaxy clusters can act as gravitational lenses and magnify the universe behind them, allowing us to see deep into the early universe. The Hubble Space Telescope Frontier Fields program uses six galaxy clusters imaged by Hubble to discover and study galaxies at z ∼ 5-10. Seven independent teams developed lens models and derived magnifications for …