Search Publications
A Kinematic View of NGC 1261: Structural Parameters, Internal Dispersion, Absolute Proper Motion, and Blue Straggler Stars
Anderson, Jay; Cadelano, Mario; Pallanca, Cristina +8 more
We constructed a Hubble Space Telescope (HST) astrophotometric catalog of the central region of the Galactic globular cluster NGC 1261. This catalog, complemented with Gaia DR2 data sampling the external regions, has been used to estimate the structural parameters of the system (I.e., core, half-mass, tidal radii, and concentration) from its resol…
Infrared Excesses around Bright White Dwarfs from Gaia and unWISE. I.
Lai, Samuel; Xu, Siyi; Dennihy, Erik
Studies of excess infrared radiation around white dwarfs provide important constraints on the evolution of planetary systems and low-mass companions beyond the main-sequence stage. In this paper series, we focus on identifying and characterizing bright white dwarfs with an infrared excess. Here, we present 188 infrared excess candidates from Gaia …
X-ray observations of luminous dusty quasars at z > 2
Fabian, A. C.; Lansbury, G. B.; Banerji, M. +1 more
We present new X-ray observations of luminous heavily dust-reddened quasars (HRQs) selected from infrared (IR) sky surveys. HRQs appear to be a dominant population at high redshifts and the highest luminosities, and may be associated with a transitional 'blowout' phase of black hole and galaxy co-evolution models. Despite this, their high-energy p…
Direct Radio Discovery of a Cold Brown Dwarf
Callingham, J. R.; Shimwell, T. W.; Vedantham, H. K. +9 more
Magnetospheric processes seen in gas giants such as aurorae and circularly polarized cyclotron maser radio emission have been detected from some brown dwarfs. However, previous radio observations targeted known brown dwarfs discovered via their infrared emission. Here we report the discovery of BDR J1750+3809, a circularly polarized radio source d…
The ALPINE-ALMA [C II] survey: a triple merger at z ∼ 4.56
Cimatti, A.; Maiolino, R.; Pozzi, F. +29 more
We report the detection of [C II] λ158 µm emission from a system of three closely separated sources in the Cosmic Evolution Survey (COSMOS) field at z ∼ 4.56 , as part of the Atacama Large Millimeter/submillimeter Array (ALMA) Large Program to INvestigate C II at Early times (ALPINE). The two most luminous sources are closely associated, bot…
A Search for FeH in Hot-Jupiter Atmospheres with High-dispersion Spectroscopy
Kesseli, Aurora Y.; Alonso-Floriano, F. J.; Snellen, I. A. G. +2 more
Most of the molecules detected thus far in exoplanet atmospheres, such as water and CO, are present for a large range of pressures and temperatures. In contrast, metal hydrides exist in much more specific regimes of parameter space, and so can be used as probes of atmospheric conditions. Iron hydride (FeH) is a dominant source of opacity in low-ma…
The Angular Momentum of the Circumgalactic Medium in the TNG100 Simulation
Genel, Shy; Pillepich, Annalisa; Nelson, Dylan +3 more
We present an analysis of the angular momentum content of the circumgalactic medium (CGM) using TNG100, one of the flagship runs of the IllustrisTNG project. We focus on Milky Way-mass halos (∼1012 M⊙) at z = 0 but also analyze other masses and redshifts up to z = 5. We find that the CGM angular momentum properties are strong…
Validating scattering-induced (sub)millimetre disc polarization through the spectral index, wavelength-dependent polarization pattern, and polarization spectrum: the case of HD 163296
Hull, Charles L. H.; Li, Zhi-Yun; Yang, Haifeng +3 more
A number of young circumstellar discs show strikingly ordered (sub)millimetre polarization orientations along the minor axis, which is strong evidence for polarization due to scattering by ∼0.1 mm-sized grains. To test this mechanism further, we model the ALMA dust continuum and polarization data of HD 163296 using radmc-3d. We find that scatterin…
The MBHBM⋆ Project. I. Measurement of the Central Black Hole Mass in Spiral Galaxy NGC 3504 Using Molecular Gas Kinematics
Imanishi, Masatoshi; Neumayer, Nadine; Greene, Jenny E. +17 more
We present a dynamical mass measurement of the supermassive black hole (SMBH) in the nearby double-barred spiral galaxy NGC 3504 as part of the Measuring Black Holes in below Milky Way (M⋆) Mass Galaxies Project. Our analysis is based on Atacama Large Millimeter/submillimeter Array cycle 5 observations of the 12CO(2-1) emissi…
Lyman continuum escape fraction in Ly α emitters at z ≃ 3.1
Fan, Xiaohui; Bian, Fuyan
We measure the Lyman continuum (LyC) escape fraction in 54 faint Lyman-alpha emitters (LAEs) at z ≃ 3.1 in the GOODS-South field. With the average magnitude of R = 26.7 AB (MUV = -18.8 and L ≃ 0.1L*), these galaxies represent a population of compact young dwarf galaxies. Their properties are likely to resemble those in the galaxies resp…