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Bose-Einstein-condensed scalar field dark matter and the gravitational wave background from inflation: New cosmological constraints and its detectability by LIGO
Shapiro, Paul R.; Li, Bohua; Rindler-Daller, Tanja
We consider an alternative to weakly interacting massive particle (WIMP) cold dark matter (CDM)—ultralight bosonic dark matter (m ≳10-22 eV /c2) described by a complex scalar field (SFDM) with a global U (1 ) symmetry—for which the comoving particle number density or charge density is conserved after particle production durin…
Whimper of a Bang: Documenting the Final Days of the Nearby Type Ia Supernova 2011fe
Garnavich, P. M.; Kochanek, C. S.; Stanek, K. Z. +1 more
Using the Hubble Space Telescope (HST) and the Large Binocular Telescope, we followed the evolution of the Type Ia supernova (SN Ia) 2011fe for an unprecedented 1840 days past B-band maximum light and over a factor of 7 million in flux. At 1840 days, the 4000-17000 Å quasi-bolometric luminosity is just (420+/- 20) {L}⊙ . By measuring th…
Estimation of a coronal mass ejection magnetic field strength using radio observations of gyrosynchrotron radiation
Carley, Eoin P.; Vilmer, Nicole; Simões, Paulo J. A. +1 more
Coronal mass ejections (CMEs) are large eruptions of plasma and magnetic field from the low solar corona into interplanetary space. These eruptions are often associated with the acceleration of energetic electrons which produce various sources of high intensity plasma emission. In relatively rare cases, the energetic electrons may also produce gyr…
A Comparison of Cosmological Parameters Determined from CMB Temperature Power Spectra from the South Pole Telescope and the Planck Satellite
Bleem, L. E.; Stark, A. A.; George, E. M. +42 more
The Planck cosmic microwave background temperature data are best fit with a ΛCDM model that mildly contradicts constraints from other cosmological probes. The South Pole Telescope (SPT) 2540 {\deg }2 SPT-SZ survey offers measurements on sub-degree angular scales (multipoles 650≤slant {\ell }≤slant 2500) with sufficient precision to use …
On the Stellar Masses of Giant Clumps in Distant Star-forming Galaxies
Schaerer, Daniel; Cava, Antonio; Mayer, Lucio +2 more
We analyze stellar masses of clumps drawn from a compilation of star-forming galaxies at 1.1 < z < 3.6. Comparing clumps selected in different ways, and in lensed or blank field galaxies, we examine the effects of spatial resolution and sensitivity on the inferred stellar masses. Large differences are found, with median stellar masses rangin…
The Grism Lens-Amplified Survey from Space (GLASS). XI. Detection of C IV in Multiple Images of the z = 6.11 Lyα Emitter behind RXC J2248.7-4431
Vulcani, B.; Hoag, A.; Bradač, M. +11 more
The C III] and C IV rest-frame UV emission lines are powerful probes of the ionization states of galaxies. They have furthermore been suggested as alternatives for spectroscopic redshift confirmation of objects at the epoch of reionization (z> 6), where the most frequently used redshift indicator, Lyα, is attenuated by the high fraction of neut…
Stellar Photometric Structures of the Host Galaxies of Nearby Type 1 Active Galactic Nuclei
Ho, Luis C.; Barth, Aaron J.; Im, Myungshin +2 more
We present detailed image analysis of rest-frame optical images of 235 low-redshift (z ≲ 0.35) Type 1 active galactic nuclei (AGNs) observed with the Hubble Space Telescope. The high-resolution images enable us to perform rigorous two-dimensional image modeling to decouple the luminous central point source from the host galaxy, which, when warrant…
A population of faint low surface brightness galaxies in the Perseus cluster core
Wittmann, Carolin; Kotulla, Ralf; Lisker, Thorsten +7 more
We present the detection of 89 low surface brightness (LSB), and thus low stellar density galaxy candidates in the Perseus cluster core, of the kind named 'ultra-diffuse galaxies', with mean effective V-band surface brightnesses 24.8-27.1 mag arcsec-2, total V-band magnitudes -11.8 to -15.5 mag, and half-light radii 0.7-4.1 kpc. The can…
The Gaia ultracool dwarf sample - I. Known L and T dwarfs and the first Gaia data release
Caballero, J. A.; Sarro, L. M.; Marocco, F. +5 more
We identify and investigate known ultracool stars and brown dwarfs that are being observed or indirectly constrained by the Gaia mission. These objects will be the core of the Gaia ultracool dwarf sample composed of all dwarfs later than M7 that Gaia will provide direct or indirect information on. We match known L and T dwarfs to the Gaia first da…
Eclipsing binary stars with a δ Scuti component
Smalley, B.; Kahraman Aliçavuş, F.; Kubát, J. +1 more
Eclipsing binaries with a δ Sct component are powerful tools to derive the fundamental parameters and probe the internal structure of stars. In this study, spectral analysis of six primary δ Sct components in eclipsing binaries has been performed. Values of Teff, v sin I, and metallicity for the stars have been derived from medium-resol…