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Cosmic microwave background constraints on secret interactions among sterile neutrinos
Mirizzi, Alessandro; Lattanzi, Massimiliano; Natoli, Paolo +3 more
Secret contact interactions among eV sterile neutrinos, mediated by a massive gauge boson X (with MX ll MW), and characterized by a gauge coupling gX, have been proposed as a mean to reconcile cosmological observations and short-baseline laboratory anomalies. We constrain this scenario using the latest Planck data …
A Unified tool to estimate Distances, Ages, and Masses (UniDAM) from spectrophotometric data
Hekker, Saskia; Mints, Alexey
Context. Galactic archaeology, the study of the formation and evolution of the Milky Way by reconstructing its past from its current constituents, requires precise and accurate knowledge of stellar parameters for as many stars as possible. To achieve this, a number of large spectroscopic surveys have been undertaken and are still ongoing.
Aim…
Bimodal Long-lasting Components in Short Gamma-Ray Bursts: Promising Electromagnetic Counterparts to Neutron Star Binary Mergers
Sakamoto, Takanori; Kisaka, Shota; Ioka, Kunihito
Long-lasting emission of short gamma-ray bursts (GRBs) is crucial to reveal the physical origin of the central engine as well as to detect electromagnetic (EM) counterparts to gravitational waves (GWs) from neutron star binary mergers. We investigate 65 X-ray light curves of short GRBs, which is six times more than previous studies, by combining b…
Neutral gas heating by X-rays in primitive galaxies: Infrared observations of the blue compact dwarf I Zw 18 with Herschel
Kunth, D.; Lebouteiller, V.; Galliano, F. +8 more
Context. The neutral interstellar medium of galaxies acts as a reservoir to fuel star formation. The dominant heating and cooling mechanisms in this phase are uncertain in extremely metal-poor star-forming galaxies. The low dust-to-gas mass ratio and low polycyclic aromatic hydrocarbon abundance in such objects suggest that the traditional photoel…
Strong lensing signatures of luminous structure and substructure in early-type galaxies
Treu, Tommaso; Keeton, Charles R.; Nierenberg, Anna M. +2 more
The arrival times, positions and fluxes of multiple images in strong lens systems can be used to infer the presence of dark subhaloes in the deflector, and thus test predictions of cold dark matter models. However, gravitational lensing does not distinguish between perturbations to a smooth gravitational potential arising from baryonic and non-bar…
A Survey For Planetary-mass Brown Dwarfs in the Taurus and Perseus Star-forming Regions
Luhman, K. L.; Esplin, T. L.
We present the initial results from a survey for planetary-mass brown dwarfs in the Taurus star-forming region. We have identified brown dwarf candidates in Taurus using proper motions and photometry from several ground- and space-based facilities. Through spectroscopy of some of the more promising candidates, we have found 18 new members of Tauru…
Detection of methyl isocyanate (CH3NCO) in a solar-type protostar
Testi, L.; Martín-Pintado, J.; Jiménez-Serra, I. +3 more
We report the detection of the pre-biotic molecule CH3NCO in a solar-type protostar, IRAS16293-2422 B. A significant abundance of this species on the surface of the comet 67P/Churyumov-Gerasimenko has been proposed, and it has recently been detected in hot cores around high-mass protostars. We observed IRAS16293-2422 B with the Atacama …
The faint radio sky: VLBA observations of the COSMOS field
Smolčić, V.; Momjian, E.; Schinnerer, E. +10 more
Context. Quantifying the fraction of active galactic nuclei (AGN) in the faint radio population and understanding their relation with star-forming activity are fundamental to studies of galaxy evolution. Very long baseline interferometry (VLBI) observations are able to identify AGN above relatively low redshifts (z> 0.1) since they provide mill…
The VLT-FLAMES Tarantula Survey. XXVI. Properties of the O-dwarf population in 30 Doradus
Crowther, P. A.; Lennon, D. J.; Herrero, A. +21 more
Context. The VLT-FLAMES Tarantula Survey has observed hundreds of O-type stars in the 30 Doradus region of the Large Magellanic Cloud (LMC).
Aims: We study the properties of a statistically significant sample of O-type dwarfs in the same star-forming region and test the latest atmospheric and evolutionary models of the early main-sequence pha…
Illuminating gas inflows/outflows in the MUSE deepest fields: Lyα nebulae around forming galaxies at z ≃ 3.3
Gilli, R.; Grillo, C.; Tozzi, P. +11 more
We report the identification of extended Lyα nebulae at z ≃ 3.3 in the Hubble Ultra Deep Field (HUDF, ≃40 kpc × 80 kpc) and behind the Hubble Frontier Field galaxy cluster MACSJ0416 (≃40 kpc), spatially associated with groups of star-forming galaxies. VLT/MUSE integral field spectroscopy reveals a complex structure with a spatially varying double-…