Search Publications
Dust in the Reionization Era: ALMA Observations of a z = 8.38 Gravitationally Lensed Galaxy
Pérez-Fournon, I.; Laporte, N.; Bauer, F. E. +6 more
We report on the detailed analysis of a gravitationally lensed Y-band dropout, A2744_YD4, selected from deep Hubble Space Telescope imaging in the Frontier Field cluster Abell 2744. Band 7 observations with the Atacama Large Millimeter/submillimeter Array (ALMA) indicate the proximate detection of a significant 1 mm continuum flux suggesting the p…
Global constraints on absolute neutrino masses and their ordering
Di Valentino, Eleonora; Melchiorri, Alessandro; Capozzi, Francesco +3 more
Within the standard three-neutrino framework, the absolute neutrino masses and their ordering (either normal, NO, or inverted, IO) are currently unknown. However, the combination of current data coming from oscillation experiments, neutrinoless double beta (0 ν β β ) decay searches, and cosmological surveys, can provide interesting constraints for…
Standing on the Shoulders of Dwarfs: the Kepler Asteroseismic LEGACY Sample. II.Radii, Masses, and Ages
Chaplin, William J.; Davies, Guy R.; Latham, David W. +21 more
We use asteroseismic data from the Kepler satellite to determine fundamental stellar properties of the 66 main-sequence targets observed for at least one full year by the mission. We distributed tens of individual oscillation frequencies extracted from the time series of each star among seven modeling teams who applied different methods to determi…
The z ∼ 6 Luminosity Function Fainter than -15 mag from the Hubble Frontier Fields: The Impact of Magnification Uncertainties
Oesch, P. A.; Bouwens, R. J.; Illingworth, G. D. +2 more
We use the largest sample of z∼ 6 galaxies to date from the first four Hubble Frontier Fields clusters to set constraints on the shape of the z∼ 6 luminosity functions (LFs) to fainter than {M}{UV,{AB}}=-14 mag. We quantify, for the first time, the impact of magnification uncertainties on LF results and thus provide more realistic const…
Structural and Star-forming Relations since z ∼ 3: Connecting Compact Star-forming and Quiescent Galaxies
Barro, Guillermo; Pérez-González, Pablo G.; Kocevski, Dale D. +13 more
We study the evolution of the scaling relations that compare the effective density ({{{Σ }}}{{e}},r< {r}{{e}}) and core density ({{{Σ }}}1,r< 1 kpc) to the stellar masses of star-forming galaxies (SFGs) and quiescent galaxies. These relations have been fully in place since z∼ 3 and have exhibited almost const…
Three-dimensional mapping of the local interstellar medium with composite data
Monreal-Ibero, A.; Elyajouri, M.; Lallement, R. +2 more
Context. Three-dimensional maps of the Galactic interstellar medium are general astrophysical tools. Reddening maps may be based on the inversion of color excess measurements for individual target stars or on statistical methods using stellar surveys. Three-dimensional maps based on diffuse interstellar bands (DIBs) have also been produced. All me…
Precision Stellar Characterization of FGKM Stars using an Empirical Spectral Library
Petigura, Erik A.; von Braun, Kaspar; Yee, Samuel W.
Classification of stars, by comparing their optical spectra to a few dozen spectral standards, has been a workhorse of observational astronomy for more than a century. Here, we extend this technique by compiling a library of optical spectra of 404 touchstone stars observed with Keck/HIRES by the California Planet Search. The spectra have high reso…
The COS-Halos Survey: Metallicities in the Low-redshift Circumgalactic Medium
Tripp, Todd M.; Worseck, Gábor; Prochaska, J. Xavier +8 more
We analyze new far-ultraviolet spectra of 13 quasars from the z∼ 0.2 COS-Halos survey that cover the H I Lyman limit of 14 circumgalactic medium (CGM) systems. These data yield precise estimates or more constraining limits than previous COS-Halos measurements on the H I column densities {N}{{H}{{I}}}. We then apply a Monte-Carlo Markov …
CMB bounds on disk-accreting massive primordial black holes
Calore, Francesca; Kohri, Kazunori; Poulin, Vivian +2 more
Stellar-mass primordial black holes (PBH) have been recently reconsidered as a dark matter (DM) candidate after the aLIGO discovery of several binary black hole (BH) mergers with masses of tens of M⊙ . Matter accretion on such massive objects leads to the emission of high-energy photons, capable of altering the ionization and thermal hi…
Electromagnetic evidence that SSS17a is the result of a binary neutron star merger
Rest, A.; Foley, R. J.; Boutsia, K. +18 more
Eleven hours after the detection of gravitational wave source GW170817 by the Laser Interferometer Gravitational-Wave Observatory and Virgo Interferometers, an associated optical transient, SSS17a, was identified in the galaxy NGC 4993. Although the gravitational wave data indicate that GW170817 is consistent with the merger of two compact objects…