Search Publications
Molecular Gas Contents and Scaling Relations for Massive, Passive Galaxies at Intermediate Redshifts from the LEGA-C Survey
Muzzin, Adam; van Dokkum, Pieter; van der Wel, Arjen +13 more
A decade of study has established that the molecular gas properties of star-forming galaxies follow coherent scaling relations out to z ∼ 3, suggesting remarkable regularity of the interplay between molecular gas, star formation, and stellar growth. Passive galaxies, however, are expected to be gas-poor and therefore faint, and thus little is know…
Dual Phase-space Cascades in 3D Hybrid-Vlasov-Maxwell Turbulence
Califano, F.; Cerri, S. S.; Kunz, M. W.
To explain energy dissipation via turbulence in collisionless, magnetized plasmas, the existence of a dual real- and velocity-space cascade of ion-entropy fluctuations below the ion gyroradius has been proposed. Such a dual cascade, predicted by the gyrokinetic theory, has previously been observed in gyrokinetic simulations of two-dimensional, ele…
Unveiling the Dynamical State of Massive Clusters through the ICL Fraction
Koekemoer, Anton M.; Donahue, Megan; Frye, Brenda L. +34 more
We have selected a sample of 11 massive clusters of galaxies observed by the Hubble Space Telescope in order to study the impact of the dynamical state on the intracluster light (ICL) fraction, the ratio of total integrated ICL to the total galaxy member light. With the exception of the Bullet cluster, the sample is drawn from the Cluster Lensing …
Ionized and Molecular Gas Kinematics in a z = 1.4 Star-forming Galaxy
Lutz, D.; Wuyts, S.; Förster Schreiber, N. M. +17 more
We present deep observations of a z = 1.4 massive, star-forming galaxy (SFG) in molecular and ionized gas at comparable spatial resolution (CO 3-2, NOrthern Extended Millimeter Array (NOEMA); Hα, Large Binocular Telescope (LBT)). The kinematic tracers agree well, indicating that both gas phases are subject to the same gravitational potential and p…
The Projected Dark and Baryonic Ellipsoidal Structure of 20 CLASH Galaxy Clusters
Donahue, Megan; Broadhurst, Tom; Zitrin, Adi +24 more
We reconstruct the two-dimensional (2D) matter distributions in 20 high-mass galaxy clusters selected from the CLASH survey by using the new approach of performing a joint weak gravitational lensing analysis of 2D shear and azimuthally averaged magnification measurements. This combination allows for a complete analysis of the field, effectively br…
Magnetic Reconnection at the Earliest Stage of Solar Flux Emergence
Chen, Yajie; Tian, Hui; Zhu, Xiaoshuai +3 more
On 2016 September 20, the Interface Region Imaging Spectrograph observed an active region during its earliest emerging phase for almost 7 hr. The Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory observed continuous emergence of small-scale magnetic bipoles with a rate of ∼1016 Mx s-1. The emergence of …
Eddington-limited Accretion in z ∼ 2 WISE-selected Hot, Dust-obscured Galaxies
Tsai, Chao-Wei; Wright, Edward L.; Jun, Hyunsung D. +12 more
Hot, dust-obscured galaxies, or “Hot DOGs,” are a rare, dusty, hyperluminous galaxy population discovered by the WISE mission. Predominantly at redshifts 2-3, they include the most luminous known galaxies in the universe. Their high luminosities likely come from accretion onto highly obscured supermassive black holes (SMBHs). We have conducted a p…
A Foreground Masking Strategy for [C II] Intensity Mapping Experiments Using Galaxies Selected by Stellar Mass and Redshift
Bock, J.; Zemcov, M.; Cooray, A. R. +11 more
Intensity mapping provides a unique means to probe the epoch of reionization (EoR), when the neutral intergalactic medium was ionized by energetic photons emitted from the first galaxies. The [C II] 158 µm fine-structure line is typically one of the brightest emission lines of star-forming galaxies and thus a promising tracer of the global E…
Binary Pulsar Distances and Velocities from Gaia Data Release 2
Deller, Adam T.; Kaplan, David L.; Chatterjee, Shami +2 more
The second data release from the Gaia mission (Gaia DR2) includes, among its billion entries, astrometric parameters for binary companions to a number of known pulsars, including white dwarf companions to millisecond pulsars (MSPs) and the non-degenerate components of so-called “black widow” and “redback” systems. We find 22 such counterparts in D…
Evidence of a Non-universal Stellar Initial Mass Function. Insights from HST Optical Imaging of Six Ultra-faint Dwarf Milky Way Satellites
Brown, Thomas M.; Gennaro, Mario; Geha, Marla +9 more
Using deep observations obtained with the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope (HST), we demonstrate that the sub-solar stellar initial mass function (IMF) of six ultra-faint dwarf Milky Way satellites (UFDs) is more bottom light than the IMF of the Milky Way disk. Our data have a lower-mass limit of ∼0.45 M ⊙…