Search Publications
Missions
Journals
Publication Years
ALMA Reveals Potential Evidence for Spiral Arms, Bars, and Rings in High-redshift Submillimeter Galaxies
Smail, I.; Menten, K. M.; Brandt, W. N. +19 more
We present subkiloparsec-scale mapping of the 870 µm ALMA continuum emission in six luminous (L IR ∼ 5 × 1012 L ⊙) submillimeter galaxies (SMGs) from the ALESS survey of the Extended Chandra Deep Field South. Our high-fidelity 0.″07-resolution imaging (∼500 pc) reveals robust evidence for structures with deco…
Mapping the Stellar Halo with the H3 Spectroscopic Survey
Conroy, Charlie; Johnson, Benjamin D.; Berlind, Perry +12 more
Modern theories of galaxy formation predict that the Galactic stellar halo was hierarchically assembled from the accretion and disruption of smaller systems. This hierarchical assembly is expected to produce a high degree of structure in the combined phase and chemistry space; this structure should provide a relatively direct probe of the accretio…
General relativistic orbital decay in a seven-minute-orbital-period eclipsing binary system
Kulkarni, S. R.; Duev, Dmitry A.; Riddle, Reed +23 more
General relativity1 predicts that short-orbital-period binaries emit considerable amounts of gravitational radiation. The upcoming Laser Interferometer Space Antenna2 (LISA) is expected to detect tens of thousands of such systems3 but few have been identified4, of which only one5 is eclipsing—…
New constraints on sterile neutrino dark matter from NuSTAR M31 observations
Wik, Daniel R.; Krivonos, Roman; Beacom, John F. +4 more
We use a combined 1.2 Ms of NuSTAR observations of M31 to search for x-ray lines from sterile neutrino dark matter decay. For the first time in a NuSTAR analysis, we consistently take into account the signal contribution from both the focused and unfocused fields of view. We also reduce the modeling systematic uncertainty by performing spectral fi…
Half-mass Radii for ∼7000 Galaxies at 1.0 ≤ z ≤ 2.5: Most of the Evolution in the Mass-Size Relation Is Due to Color Gradients
Barro, Guillermo; Kriek, Mariska; Price, Sedona H. +1 more
Radial mass-to-light ratio gradients cause the half-mass and half-light radii of galaxies to differ, potentially biasing studies that use half-light radii. Here we present the largest catalog to date of galaxy half-mass radii at z > 1: 7006 galaxies in the CANDELS fields at 1.0 ≤ z ≤ 2.5. The sample includes both star-forming and quiescent gala…
On the dust temperatures of high-redshift galaxies
Faucher-Giguère, Claude-André; Hayward, Christopher C.; Hopkins, Philip F. +7 more
Dust temperature is an important property of the interstellar medium (ISM) of galaxies. It is required when converting (sub)millimetre broad-band flux to total infrared luminosity (LIR), and hence star formation rate, in high-redshift galaxies. However, different definitions of dust temperatures have been used in the literature, leading…
Is the dark-matter halo spin a predictor of galaxy spin and size?
Somerville, Rachel S.; Genel, Shy; Dekel, Avishai +8 more
The similarity between the distributions of spins for galaxies (λgal) and for dark-matter haloes (λhalo), indicated both by simulations and observations, is naively interpreted as a one-to-one correlation between the spins of a galaxy and its host halo. This is used to predict galaxy sizes in semi-analytic models via Re<…
A radio ridge connecting two galaxy clusters in a filament of the cosmic web
Brunetti, G.; Enßlin, T. A.; Shimwell, T. W. +26 more
Galaxy clusters are the most massive gravitationally bound structures in the Universe. They grow by accreting smaller structures in a merging process that produces shocks and turbulence in the intracluster gas. We observed a ridge of radio emission connecting the merging galaxy clusters Abell 0399 and Abell 0401 with the Low-Frequency Array (LOFAR…
The Chemical Evolution of Carbon, Nitrogen, and Oxygen in Metal-poor Dwarf Galaxies
McQuinn, Kristen B. W.; Skillman, Evan D.; Erb, Dawn K. +2 more
Ultraviolet nebular emission lines are important for understanding the time evolution and nucleosynthetic origins of their associated elements, but the underlying trends of their relative abundances are unclear. We present UV spectroscopy of 20 nearby low-metallicity, high-ionization dwarf galaxies obtained using the Hubble Space Telescope. Buildi…
Gravitational lensing reveals ionizing ultraviolet photons escaping from a distant galaxy
Mahler, Guillaume; Chisholm, John; Rigby, Jane R. +7 more
During the epoch of reionization, neutral gas in the early Universe was ionized by hard ultraviolet radiation emitted by young stars in the first galaxies. To do so, ionizing ultraviolet photons must escape from the host galaxy. We present Hubble Space Telescope observations of the gravitationally lensed post-reionization galaxy PSZ1-ARC G311.6602…