Search Publications
Hunting black holes with Gaia
Loeb, Abraham; Mashian, Natalie
We predict the number of black holes with stellar companions that are potentially detectable with Gaia astrometry over the course of its 5-yr mission. Our model estimates that nearly 2 × 105 astrometric binaries hosting black holes and stellar companions brighter than Gaia's detection threshold, G ∼ 20, should be discovered with 5σ sens…
The Hierarchical Distribution of the Young Stellar Clusters in Six Local Star-forming Galaxies
Dale, D. A.; Calzetti, D.; Kennicutt, R. C. +16 more
We present a study of the hierarchical clustering of the young stellar clusters in six local (3-15 Mpc) star-forming galaxies using Hubble Space Telescope broadband WFC3/UVIS UV and optical images from the Treasury Program LEGUS (Legacy ExtraGalactic UV Survey). We identified 3685 likely clusters and associations, each visually classified by their…
Dust-deficient Palomar-Green Quasars and the Diversity of AGN Intrinsic IR Emission
Lyu, Jianwei; Rieke, G. H.; Shi, Yong
To elucidate the intrinsic broadband infrared (IR) emission properties of active galactic nuclei (AGNs), we analyze the spectral energy distributions (SEDs) of 87 z ≲ 0.5 Palomar-Green (PG) quasars. While the Elvis AGN template with a moderate far-IR correction can reasonably match the SEDs of the AGN components in ∼60% of the sample (and is super…
The Size Evolution of Star-forming Galaxies since z ∼ 7 Using ZFOURGE
Papovich, Casey; Allen, Rebecca J.; Kacprzak, Glenn G. +10 more
For the first time, we present the size evolution of a mass-complete (log(M*/M⊙) > 10) sample of star-forming galaxies over redshifts z = 1-7, selected from the FourStar Galaxy Evolution Survey. Observed H-band sizes are measured from the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) Hubble Space…
Fading AGN Candidates: AGN Histories and Outflow Signatures
Schawinski, Kevin; Sartori, Lia F.; Keel, William C. +12 more
We consider the energy budgets and radiative history of eight fading active galactic nuclei (AGNs), identified from an energy shortfall between the requirements to ionize very extended (radius > 10 kpc) ionized clouds and the luminosity of the nucleus as we view it directly. All show evidence of significant fading on timescales of ≈50,000 yr. W…
CANDELS: Elevated Black Hole Growth in the Progenitors of Compact Quiescent Galaxies at z ∼ 2
Barro, Guillermo; Santini, Paola; Giavalisco, Mauro +31 more
We examine the fraction of massive ({M}* > {10}10 {M}⊙ ) compact star-forming galaxies (cSFGs) that host an active galactic nucleus (AGN) at z∼ 2. These cSFGs are likely the direct progenitors of the compact quiescent galaxies observed at this epoch, which are the first population of passive galaxies to appear i…
Charge-Induced Force Noise on Free-Falling Test Masses: Results from LISA Pathfinder
Mendes, L.; Madden, S.; Russano, G. +93 more
We report on electrostatic measurements made on board the European Space Agency mission LISA Pathfinder. Detailed measurements of the charge-induced electrostatic forces exerted on free-falling test masses (TMs) inside the capacitive gravitational reference sensor are the first made in a relevant environment for a space-based gravitational wave de…
Study of the aluminium content in AGB winds using ALMA. Indications for the presence of gas-phase (Al2O3)n clusters
Waters, L. B. F. M.; Decin, L.; Richards, A. M. S. +8 more
Context. The condensation of inorganic dust grains in the winds of evolved stars is poorly understood. As of today, it is not yet known which molecular clusters form the first dust grains in oxygen-rich (C/O < 1) asymptotic giant branch (AGB) winds. Aluminium oxides and iron-free silicates are often put forward as promising candidates for the f…
Spectroscopic properties of luminous Ly α emitters at z ≈ 6-7 and comparison to the Lyman-break population
Sobral, David; Mobasher, Bahram; Darvish, Behnam +5 more
We present spectroscopic follow-up of candidate luminous Ly α emitters (LAEs) at z = 5.7-6.6 in the SA22 field with VLT/X-SHOOTER. We confirm two new luminous LAEs at z = 5.676 (SR6) and z = 6.532 (VR7), and also present HST follow-up of both sources. These sources have luminosities LLy α ≈ 3 × 1043 erg s-1, very h…
LOFAR Discovery of the Fastest-spinning Millisecond Pulsar in the Galactic Field
Burnett, T. H.; Camilo, F.; Michelson, P. F. +15 more
We report the discovery of PSR J0952-0607, a 707 Hz binary millisecond pulsar that is now the fastest-spinning neutron star known in the Galactic field (I.e., outside of a globular cluster). PSR J0952-0607 was found using LOFAR at a central observing frequency of 135 MHz, well below the 300 MHz to 3 GHz frequencies typically used in pulsar searche…