Search Publications
The MOSDEF Survey: A Census of AGN-driven Ionized Outflows at z = 1.4-3.8
Siana, Brian; Azadi, Mojegan; Aird, James +13 more
Using data from the MOSFIRE Deep Evolution Field (MOSDEF) survey, we present a census of active galactic nucleus (AGN)-driven ionized outflows in a sample of 159 AGNs at 1.4 ≤ z ≤ 3.8. The sample spans AGN bolometric luminosities of 1044-47 erg s-1 and includes both quiescent and star-forming galaxies extending across 3 order…
The Peculiar Volatile Composition of CO-dominated Comet C/2016 R2 (PanSTARRS)
Villanueva, Geronimo L.; Cochran, Anita L.; Bauer, James +14 more
Comet C/2016 R2 (PanSTARRS) has a peculiar volatile composition, with CO being the dominant volatile, as opposed to H2O, and one of the largest N2/CO ratios ever observed in a comet. Using observations obtained with the Spitzer Space Telescope, NASA’s Infrared Telescope Facility, the 3.5 m Astrophysical Research Consortium te…
Proper Motions of Stellar Streams Discovered in the Dark Energy Survey
Wang, M. Y.; Kuehn, K.; Li, T. S. +14 more
We cross-match high-precision astrometric data from Gaia DR2 with accurate multiband photometry from the Dark Energy Survey (DES) DR1 to confidently measure proper motions for nine stellar streams in the DES footprint: Aliqa Uma, ATLAS, Chenab, Elqui, Indus, Jhelum, Phoenix, Tucana III, and Turranburra. We determine low-confidence proper-motion me…
Linking galaxy structural properties and star formation activity to black hole activity with IllustrisTNG
Somerville, Rachel S.; Torrey, Paul; Vogelsberger, Mark +11 more
We study the connection between active galactic nuclei (AGN) and their host galaxies through cosmic time in the large-scale cosmological IllustrisTNG simulations. We first compare BH properties, i.e. the hard X-ray BH luminosity function, AGN galaxy occupation fraction, and distribution of Eddington ratios, to available observational constraints. …
Relative Alignment between the Magnetic Field and Molecular Gas Structure in the Vela C Giant Molecular Cloud Using Low- and High-density Tracers
Ward-Thompson, Derek; Fissel, Laura M.; Friesen, Rachel +37 more
We compare the magnetic field orientation for the young giant molecular cloud Vela C inferred from 500 µm polarization maps made with the BLASTPol balloon-borne polarimeter to the orientation of structures in the integrated line emission maps from Mopra observations. Averaging over the entire cloud we find that elongated structures in integr…
Whistler Fan Instability Driven by Strahl Electrons in the Solar Wind
Bale, S. D.; Krasnoselskikh, V.; Mozer, F. S. +3 more
We present a theoretical analysis of electron heat flux inhibition in the solar wind when a significant portion of the heat flux is carried by strahl electrons. We adopt core-strahl velocity distribution functions typical for the solar wind at 0.3-4 au to demonstrate that strahl electrons are capable of generating highly oblique whistler waves at …
The Type II-plateau Supernova 2017eaw in NGC 6946 and Its Red Supergiant Progenitor
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Kelly, Patrick L. +31 more
We present extensive optical photometric and spectroscopic observations, from 4 to 482 days after explosion, of the Type II-plateau (II-P) supernova (SN) 2017eaw in NGC 6946. SN 2017eaw is a normal SN II-P intermediate in properties between, for example, SN 1999em and SN 2012aw and the more luminous SN 2004et, also in NGC 6946. We have determined …
The refractory-to-ice mass ratio in comets
Blum, J.; Gundlach, B.; Mottola, S. +6 more
We review the complex relationship between the dust-to-gas mass ratio usually estimated in the material lost by comets, and the refractory-to-ice mass ratio inside the nucleus, which constrains the origin of comets. Such a relationship is dominated by the mass transfer from the perihelion erosion to fallout over most of the nucleus surface. This m…
WASP-4b Arrived Early for the TESS Mission
Dai, F.; Winn, J. N.; Jenkins, J. M. +21 more
The Transiting Exoplanet Survey Satellite (TESS) recently observed 18 transits of the hot Jupiter WASP-4b. The sequence of transits occurred 81.6 ± 11.7 s earlier than had been predicted, based on data stretching back to 2007. This is unlikely to be the result of a clock error, because TESS observations of other hot Jupiters (WASP-6b, 18b, and 46b…
A quantitative analysis of systematic differences in the positions and proper motions of Gaia DR2 with respect to VLBI
Petrov, L.; Kovalev, Y. Y.; Plavin, A. V.
We have analysed the differences in positions of 9081 matched sources between the Gaia Data Release 2 (DR2) and very long baseline interferometry (VLBI) catalogues. The median position uncertainty of matched sources in the VLBI catalogue is a factor of two larger than the median position uncertainty in Gaia DR2. There are 9 per cent matched source…