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The Massive and Distant Clusters of WISE Survey. VI. Stellar Mass Fractions of a Sample of High-redshift Infrared-selected Clusters
Gupta, Nikhel; Eisenhardt, Peter R. M.; Gonzalez, Anthony H. +17 more
We present measurements of the stellar mass fractions ({f}\star ) for a sample of high-redshift (0.93 ≤ z ≤ 1.32) infrared-selected galaxy clusters from the Massive and Distant Clusters of WISE Survey (MaDCoWS) and compare them to the stellar mass fractions of Sunyaev-Zel’dovich (SZ) effect-selected clusters in a similar mass and redshi…
On the photometric signature of fast rotators
Girardi, Léo; Marigo, Paola; Bellini, Andrea +4 more
Rapidly rotating stars have been recently recognized as having a major role in the interpretation of colour-magnitude diagrams of young and intermediate-age star clusters in the Magellanic Clouds and in the Milky Way. In this work, we evaluate the distinctive spectra and distributions in colour-colour space that follow from the presence of a subst…
Spectroscopic Orbits of Subsystems in Multiple Stars. V.
Tokovinin, Andrei
Spectroscopic orbits are determined for inner subsystems in nine stellar hierarchies (HIP 2863, 4974, 8353, 28796, 35261, 92929, 115272, 115552, and 117596). Their periods range from 2.5 to 312 days. For each system, estimates of masses, orbital inclination, and other parameters are given.
Transition-region explosive events produced by plasmoid instability
Li, Dong
Magnetic reconnection is thought to be a key process in most solar eruptions. Thanks to highresolution observations and simulations, the studied scale of the reconnection process has become smaller and smaller. Spectroscopic observations show that the reconnection site can be very small, which always exhibits a bright core and two extended wings w…
Recognition of M-type stars in the unclassified spectra of LAMOST DR5 using a hash-learning method
Luo, A. -L.; Chen, J. -J.; Du, B. +6 more
Our study aims to recognize M-type stars which are classified as `UNKNOWN' due to poor quality in the Large sky Area Multi-Object fiber Spectroscopic Telescope (LAMOST) DR5 V1. A binary nonlinear hashing algorithm based on Multi-Layer Pseudo-Inverse Learning (ML-PIL) is proposed to effectively learn spectral features for M-type-star detection, whi…
New Candidate Planetary Nebulae in Galactic Globular Clusters from the VVV Survey
Minniti, Dante; Dias, Bruno; Gómez, Matías +2 more
Only four globular cluster planetary nebulae (GCPN) are known so far in the Milky Way. About 50 new globular clusters have been recently discovered toward the Galactic bulge. We present a search for planetary nebulae within 3‧ of the new globular clusters, revealing the identification of new candidate GCPN. These possible associations are PN SB 2 …
Detection of spike-like structures near the front of type-II bursts
Hillaris, A.; Preka-Papadema, P.; Moussas, X. +6 more
Aims: We examine high time resolution dynamic spectra for fine structures in type II solar radio bursts
Methods: We used data obtained with the acousto-optic spectrograph receiver of the Artemis-JLS (ARTEMIS-IV) solar radio spectrograph in the 450-270 MHz range at 10 ms cadence and identified more than 600 short, narrowband features. The…
Detecting the orbital motion of nearby supermassive black hole binaries with Gaia
Loeb, Abraham; D'Orazio, Daniel J.
We show that a 10-yr Gaia mission could astrometrically detect the orbital motion of ∼1 subparsec separation supermassive black hole binary in the heart of nearby, bright active galactic nuclei (AGN). Candidate AGN lie out to a redshift of z =0.02 and in the V-band magnitude range 10 ≲mV≲13 . The distribution of detectable binary masses…
2003-2018 Monitoring of the Crab Nebula Polarization in Hard X-Rays with INTEGRAL SPI
Jourdain, E.; Roques, J. -P.
We analyzed 16 yr of observations dedicated to the Crab (pulsar + nebula) with the SPectrometer on International Gamma-Ray Astrophysics Laboratory instrument to investigate its polarization properties. We find that the source presents a substantially polarized emission (PF = 24%) in the hard X-ray domain, with the electric vector aligned with the …
Radical-assisted polymerization in interstellar ice analogues: formyl radical and polyoxymethylene
Duvernay, F.; Danger, G.; Chiavassa, T. +5 more
We present new laboratory experiments on the low-temperature formation of complex organic molecules (COMs) such as polyoxymethylene (POM), glycolaldehyde, ethylene glycol, and possibly glyceraldehyde and glycerol through radical-induced reactivity from vacuum ultraviolet (VUV) photolysis of formaldehyde in Ar and Xe matrices. The radical reactivit…