Search Publications
The MOSDEF Survey: Broad Emission Lines at z = 1.4-3.8
Siana, Brian; Shapley, Alice E.; Azadi, Mojegan +12 more
We present results from the MOSFIRE Deep Evolution Field survey on broad flux from the nebular emission lines Hα, [N II], [O III], Hβ, and [S II]. The sample consists of 127 star-forming galaxies at 1.37 < z < 2.61 and 84 galaxies at 2.95 < z < 3.80. We decompose the emission lines using narrow and broad Gaussian components that we def…
The Distribution of Ultra-diffuse and Ultra-compact Galaxies in the Frontier Fields
Forbes, Duncan A.; Romanowsky, Aaron J.; Abraham, Roberto +2 more
Large low-surface-brightness galaxies have recently been found to be abundant in nearby galaxy clusters. In this paper, we investigate these ultra-diffuse galaxies (UDGs) in the six Hubble Frontier Fields galaxy clusters: A2744, MACS J0416.1-2403, MACS J0717.5+3745, MACS J1149.5+2223, AS1063, and A370. These are the most massive (1-3 × 1015
Millimeter Mapping at z ∼ 1: Dust-obscured Bulge Building and Disk Growth
Übler, Hannah; Price, Sedona H.; Belli, Sirio +16 more
A randomly chosen star in today’s universe is most likely to live in a galaxy with stellar mass between the Milky Way and Andromeda. It remains uncertain, however, how the structural evolution of these bulge-disk systems proceeded. Most of the unobscured star formation we observe by building Andromeda progenitor s at 0.7 < z < 1.5 occurs in …
Testing Systematics of Gaia DR2 Parallaxes with Empirical Surface Brightness: Color Relations Applied to Eclipsing Binaries
Breuval, Louise; Gieren, Wolfgang; Pietrzyński, Grzegorz +18 more
Using a sample of 81 galactic, detached eclipsing binary stars we investigated the global zero-point shift of their parallaxes with the Gaia Data Release 2 (DR2) parallaxes. The stars in the sample lay in a distance range of 0.04-2 kpc from the Sun. The photometric parallaxes ϖ Phot of the eclipsing binaries were determined by applying …
Anatomy of a Cooling Flow: The Feedback Response to Pure Cooling in the Core of the Phoenix Cluster
Sharon, K.; Gladders, M. D.; Gaspari, M. +17 more
We present new, deep observations of the Phoenix cluster from Chandra, the Hubble Space Telescope, and the Karl Jansky Very Large Array. These data provide an order-of-magnitude improvement in depth and/or angular resolution over previous observations at X-ray, optical, and radio wavelengths. We find that the one-dimensional temperature and entrop…
The Ultracool SpeXtroscopic Survey. I. Volume-limited Spectroscopic Sample and Luminosity Function of M7-L5 Ultracool Dwarfs
Burgasser, Adam J.; Faherty, Jacqueline K.; Gagné, Jonathan +9 more
We present a volume-limited, spectroscopically verified sample of M7-L5 ultracool dwarfs (UCDs) within 25 pc. The sample contains 410 sources, of which 93% have trigonometric distance measurements (80% from Gaia DR2) and 81% have low-resolution (R ∼ 120), near-infrared (NIR) spectroscopy. We also present an additional list of 60 sources that may b…
Radial Variations in Grain Sizes and Dust Scale Heights in the Protoplanetary Disk around HD 163296 Revealed by ALMA Polarization Observations
Kataoka, Akimasa; Ohashi, Satoshi
The disk of HD 163296 shows ring and gap substructures in observations with the Atacama Large Millimeter/submillimeter Array. In addition, this is the only disk where the rings and gaps are spatially resolved in millimeter-wave polarization measurements. In this paper, we conduct radiative transfer modeling that includes self-scattering polarizati…
Revisiting the Spectral and Timing Properties of NGC 4151
Miller, J. M.; Zoghbi, A.; Cackett, E.
NGC 4151 is the brightest Seyfert 1 nucleus in X-rays. It was the first object to show short time delays in the Fe K band, which were attributed to relativistic reverberation, providing a new tool for probing regions at the black hole scale. Here we report the results of a large XMM-Newton campaign in 2015 to study these short delays further. Anal…
Self-lensing Discovery of a 0.2 M ⊙ White Dwarf in an Unusually Wide Orbit around a Sun-like Star
Bieryla, Allyson; Latham, David W.; Aoki, Wako +4 more
We report the discovery of the fifth self-lensing binary in which a low-mass white dwarf (WD) gravitationally magnifies its 15th magnitude G-star companion, KIC 8145411, during eclipses. The system was identified from a pair of such self-lensing events in the Kepler photometry, and was followed up with the Tillinghast Reflector Echelle Spectrograp…
Comparison of Gaia DR2 Parallaxes of Stars with VLBI Astrometry
Reid, Mark J.; Zhang, Bo; Xu, Shuangjing +2 more
We compare the parallaxes of stars from VLBI astrometry in the literature to those in the Gaia DR2 catalog. Our full sample contains young stellar objects, evolved AGB stars, pulsars, and other radio stars. Excluding AGB stars, which show significant discrepancies between Gaia and VLBI parallaxes, and stars in binary systems, we obtain an average,…