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Dark Higgs dark matter
Slone, Oren; Pospelov, Maxim; Mondino, Cristina +1 more
A new U (1 ) "dark" gauge group coupled to the Standard Model (SM) via the kinetic mixing portal provides a dark matter candidate in the form of the Higgs field, hd, responsible for generating the mass of the dark photon, γd. We show that the condition mhd≤mγd , together with smalln…
The spiral structure in the Solar neighbourhood
Hou, L. G.
The spiral structure in the solar neighborhood is an important issue in astronomy. In the past few years, there has been significant progress in observation. The distances for a large number of good spiral tracers, i.e., giant molecular clouds, high-mass star-formation region masers, HII regions, O-type stars, and young open clusters, have been ac…
Inspecting the Cepheid Distance Ladder: the Hubble Space Telescope Distance to the SN Ia Host Galaxy NGC 5584
Mérand, Antoine; Breuval, Louise; Gieren, Wolfgang +7 more
The current tension between the direct and the early-universe measurements of the Hubble constant, H0, requires detailed scrutiny of all the data and methods used in the studies on both sides of the debate. The Cepheids in the Type Ia supernova (SN Ia) host galaxy NGC 5584 played a key role in the local measurement of H0. The…
37 new validated planets in overlapping K2 campaigns
Kuzuhara, M.; Tamura, M.; Fridlund, M. +24 more
We analysed 68 candidate planetary systems first identified during Campaigns 5 and 6 (C5 and C6) of the NASA K2 mission. We set out to validate these systems by using a suite of follow-up observations, including adaptive optics, speckle imaging, and reconnaissance spectroscopy. The overlap between C5 with C16 and C18, and C6 with C17, yields light…
Attention-gating for improved radio galaxy classification
Scaife, Anna M. M.; Bowles, Micah; Tang, Hongming +2 more
In this work, we introduce attention as a state-of-the-art mechanism for classification of radio galaxies, using convolutional neural networks. We present an attention-based model that performs on par with previous classifiers while using more than 50 per cent fewer parameters than the next smallest classic CNN application in this field. We demons…
CAPOS: The bulge Cluster APOgee Survey. I. Overview and initial ASPCAP results
Minniti, D.; Zoccali, M.; Rojas-Arriagada, A. +39 more
Context. Bulge globular clusters (BGCs) are exceptional tracers of the formation and chemodynamical evolution of this oldest Galactic component. However, until now, observational difficulties have prevented us from taking full advantage of these powerful Galactic archeological tools.
Aims: CAPOS, the bulge Cluster APOgee Survey, addresses thi…
Further Evidence for Tidal Spin-up of Hot Jupiter Host Stars
Winn, Joshua N.; Anderson, Kassandra R.; Tejada Arevalo, Roberto A.
For most hot Jupiters around main-sequence Sun-like stars, tidal torques are expected to transfer angular momentum from the planet's orbit to the star's rotation. The timescale for this process is difficult to calculate, leading to uncertainties in the history of orbital evolution of hot Jupiters. We present evidence for tidal spin-up by taking ad…
Non-Keplerian spirals, a gas-pressure dust trap, and an eccentric gas cavity in the circumbinary disc around HD 142527
Pinte, C.; Casassus, S.; Boehler, Y. +7 more
We present ALMA observations of the 12CO, 13CO, C18O J = 2-1 transitions and the 1.3 mm continuum emission for the circumbinary disc around HD 142527, at an angular resolution of ≈ 0${_{.}^{\prime\prime}}$3. We observe multiple spiral structures in intensity, velocity, and velocity dispersion for the 12C…
Measurements of Solar Differential Rotation Using the Century Long Kodaikanal Sunspot Data
Chatterjee, Subhamoy; Banerjee, Dipankar; Jha, Bibhuti Kumar +2 more
The rotational profile of the Sun is considered to be one of the key inputs in a solar dynamo model. Hence, precise and long-term measurements of this quantity is important for our understanding of solar magnetism and its variability. In this study, we use the newly digitised, white-light sunspot data (1923 - 2011) from Kodaikanal Solar Observator…
Physical properties of brightest cluster galaxies up to redshift 1.80 based on HST data
Durret, F.; Márquez, I.; Chu, A.
Context. Brightest cluster galaxies (BCGs) grow by accreting numerous smaller galaxies, and can be used as tracers of cluster formation and evolution in the cosmic web. However, there is still controversy regarding the main epoch of formation of BCGs; some authors believe they already formed before redshift z = 2, while others find that they are s…