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Blue extreme disk-runaway stars with Gaia EDR3
Raddi, Roberto; Irrgang, Andreas; Heber, Ulrich +1 more
Since the discovery of hypervelocity stars in 2005, it has been widely believed that only the disruption of a binary system by a supermassive black hole at the Galactic center (GC), that is, the so-called Hills mechanism, is capable of accelerating stars to beyond the Galactic escape velocity. In the meantime, however, driven by the Gaia space mis…
A Kiloparsec-scale Molecular Wave in the Inner Galaxy: Feather of the Milky Way?
Csengeri, T.; Klessen, R. S.; Schilke, P. +7 more
We report the discovery of a velocity coherent, kiloparsec-scale molecular structure toward the Galactic center region with an angular extent of 30° and an aspect ratio of 60:1. The kinematic distance of the CO structure ranges between 4.4 and 6.5 kpc. Analysis of the velocity data and comparison with the existing spiral arm models support that a …
Spectroscopic and photometric analysis of symbiotic candidates - I. Ten candidates on classical symbiotic stars
Merc, J.; Gális, R.; Wolf, M. +10 more
Symbiotic stars belong to a group of interacting binaries that display a wide variety of phenomena, including prominent outbursts connected with mass transfer, as well as stellar winds, jets, eclipses, or intrinsic variability of the components. Dozens of new symbiotic stars and candidates have been discovered in recent years. However, there are m…
AGB Interlopers in YSO Catalogs Hunted out by NEOWISE
Byun, Do-Young; Johnstone, Doug; Lee, Jeong-Eun +7 more
Asymptotic giant branch stars (AGBs) and young stellar objects (YSOs) often share the same domains in infrared (IR) color-magnitude or color-color diagrams leading to potential misclassification. We extracted a list of AGB interlopers from the published YSO catalogs using the periodogram analysis on the Near-Earth Object Wide Infrared Survey Explo…
Radiation from matter-antimatter annihilation in the quark nugget model of dark matter
Flambaum, V. V.; Samsonov, I. B.
We revisit the properties of positron cloud in quark nugget (QN) model of dark matter (DM). In this model, dark matter particles are represented by compact composite objects composed of a large number of quarks or antiquarks with total baryon number B ∼1024. These particles have a very small number density in our galaxy which makes them…
The Physical Drivers of the Luminosity-weighted Dust Temperatures in High-redshift Galaxies
Casey, Caitlin M.; Zavala, Jorge A.; Chen, Chian-Chou +7 more
The underlying distribution of galaxies' dust spectral energy distributions (SEDs) (i.e., their spectra reradiated by dust from rest-frame ∼3 µm to 3 mm) remains relatively unconstrained owing to a dearth of far-IR/(sub)millimeter data for large samples of galaxies. It has been claimed in the literature that a galaxy's dust temperature—obser…
Spatially offset black holes in the Horizon-AGN simulation and comparison to observations
Ferreira, Pedro G.; Devriendt, Julien; Slyz, Adrianne +2 more
We study the displacements between the centres of galaxies and their supermassive black holes (BHs) in the cosmological hydrodynamical simulation Horizon-AGN, and in a variety of observations from the literature. The BHs in Horizon-AGN feel a subgrid dynamical friction force, sourced by the surrounding gas, which prevents recoiling BHs being eject…
Photometry of Kuiper belt object (486958) Arrokoth from New Horizons LORRI
Buratti, Bonnie J.; Singer, Kelsi N.; Stern, S. Alan +12 more
On January 1st 2019, the New Horizons spacecraft flew by the classical Kuiper belt object (486958) Arrokoth (provisionally designated 2014 MU69), possibly the most primitive object ever explored by a spacecraft. The I/F of Arrokoth is analyzed and fit with a photometric function that is a linear combination of the Lommel-Seeliger (lunar) and Lambe…
Atacama Cosmology Telescope measurements of a large sample of candidates from the Massive and Distant Clusters of WISE Survey. Sunyaev-Zeldovich effect confirmation of MaDCoWS candidates using ACT
Hilton, Matt; Sifón, Cristóbal; Choi, Steve K. +35 more
Context. Galaxy clusters are an important tool for cosmology, and their detection and characterization are key goals for current and future surveys. Using data from the Wide-field Infrared Survey Explorer (WISE), the Massive and Distant Clusters of WISE Survey (MaDCoWS) located 2839 significant galaxy overdensities at redshifts 0.7 ≲ z ≲ 1.5, whic…
Bayesian calibration of the mixing length parameter αML and of the helium-to-metal enrichment ratio ΔY/ΔZ with open clusters: the Hyades test-bed
Valle, G.; Dell'Omodarme, M.; Prada Moroni, P. G. +2 more
We tested the capability of a Bayesian procedure to calibrate both the helium abundance and the mixing length parameter (αML), using precise photometric data for main-sequence (MS) stars in a cluster with negligible reddening and well-determined distance. The method has been applied first to a mock data set generated to mimic Hyades MS …