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The soft excess of the NLS1 galaxy Mrk 359 studied with an XMM-Newton-NuSTAR monitoring campaign
Bianchi, S.; Cappi, M.; Petrucci, P. -O. +7 more
Context. Joint XMM-Newton and NuSTAR multiple exposures allow us to disentangle the different emission components of active galactic nuclei (AGNs) and to study the evolution of their different spectral features. In this work, we present the timing and spectral properties of five simultaneous XMM-NewtonandNuSTAR observations of the Narrow Line Seyf…
Blazars at the Cosmic Dawn
Ajello, M.; Giroletti, M.; Madejski, Greg +5 more
The uncharted territory of the high-redshift (z ≳ 3) universe holds the key to understanding the evolution of quasars. In an attempt to identify the most extreme members of the quasar population, that is, blazars, we have carried out a multiwavelength study of a large sample of radio-loud quasars beyond z = 3. Our sample consists of nine γ-ray-det…
The Chandra Deep Wide-field Survey: A New Chandra Legacy Survey in the Boötes Field. I. X-Ray Point Source Catalog, Number Counts, and Multiwavelength Counterparts
Miller, Eric D.; Myers, Adam D.; Aird, James +30 more
We present a new, ambitious survey performed with the Chandra X-ray Observatory of the 9.3 deg2 Boötes field of the NOAO Deep Wide-Field Survey. The wide field probes a statistically representative volume of the universe at high redshift. The Chandra Deep Wide-field Survey exploits the excellent sensitivity and angular resolution of Cha…
The dark matter component of the Gaia radially anisotropic substructure
Grand, Robert J. J.; Gómez, Facundo A.; Fattahi, Azadeh +5 more
We study the properties of the dark matter component of the radially anisotropic stellar population recently identified in the Gaia data, using magneto-hydrodynamical simulations of Milky Way-like halos from the Auriga project. We identify 10 simulated galaxies that approximately match the rotation curve and stellar mass of the Milky Way. Four of …
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…