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Water isotopologues in the circumstellar envelopes of M-type AGB stars
Olofsson, H.; Decin, L.; Lombaert, R. +3 more
Aims: In this study we intend to examine rotational emission lines of two isotopologues of water: H217O and H218O. By determining the abundances of these molecules, we aim to use the derived isotopologue - and hence oxygen isotope - ratios to put constraints on the masses of a sample of M-type AGB s…
Weak lensing and spectroscopic analysis of the nearby dissociative merging galaxy cluster Abell 3376
Durret, F.; Cypriano, E. S.; Laganá, T. F. +5 more
The galaxy cluster Abell 3376 is a nearby (\bar{z}=0.046) dissociative merging cluster surrounded by two prominent radio relics and showing an X-ray comet-like morphology. The merger system is comprised of the subclusters A3376W and A3376E. Based on new deep multiwavelength large-field images and published redshifts, we bring new insights about th…
High-energy Gamma-Ray Activity from V404 Cygni Detected by AGILE during the 2015 June Outburst
Verrecchia, F.; Tavani, M.; Piano, G. +2 more
The AGILE satellite detected transient high-energy γ-ray emission from the X-ray binary V404 Cygni, during the 2015 June outburst observed in radio, optical, X-ray, and soft γ-ray frequencies. The activity was observed by AGILE in the 50-400 MeV energy band, between 2015 June 24 UT 06:00:00 and 2015 June 26 UT 06:00:00 (MJD 57197.25-57199.25), wit…
A Relationship Between the Solar Rotation and Activity Analysed by Tracing Sunspot Groups
Ruždjak, Domagoj; Brajša, Roman; Skokić, Ivica +2 more
The sunspot position published in the data bases of the Greenwich Photoheliographic Results (GPR), the US Air Force Solar Optical Observing Network and National Oceanic and Atmospheric Administration (USAF/NOAA), and of the Debrecen Photoheliographic Data (DPD) in the period 1874 to 2016 were used to calculate yearly values of the solar differenti…
Structure and physical conditions in the Huygens region of the Orion nebula
O'Dell, C. R.; Ferland, G. J.; Peimbert, M.
Hubble Space Telescope images, MUSE maps of emission lines, and an atlas of high velocity resolution emission-line spectra have been used to establish for the first time correlations of the electron temperature, electron density, radial velocity, turbulence, and orientation within the main ionization front of the nebula. From the study of the comb…
The Optical Counterpart to the Accreting Millisecond X-Ray Pulsar SAX J1748.9-2021 in the Globular Cluster NGC 6440
Dalessandro, E.; Ferraro, F. R.; Lanzoni, B. +3 more
We used a combination of deep optical and {{H}}α images of the Galactic globular cluster NGC 6440, acquired with the Hubble Space Telescope, to identify the optical counterpart to the accreting millisecond X-ray pulsar SAX J1748.9-2021 during quiescence. A strong {{H}}α emission has been detected from a main-sequence star (hereafter COM-SAX J1748.…
Photoionization-driven Absorption-line Variability in Balmer Absorption Line Quasar LBQS 1206+1052
Wang, Jianguo; Zhou, Hongyan; Ji, Tuo +10 more
In this paper we present an analysis of absorption-line variability in mini-BAL quasar LBQS 1206+1052. The Sloan Digital Sky Survey spectrum demonstrates that the absorption troughs can be divided into two components of blueshift velocities of ∼700 and ∼1400 km s-1 relative to the quasar rest frame. The former component shows rare Balme…
XMM-Newton Observation of the nearby Pulsar B1133+16.
Haberl, Frank; Mitra, Dipanjan; Zhang, Bing +5 more
We constrain the X-ray properties of the nearby (360 {pc}), old (5 {Myr}) pulsar B1133+16 with ∼ 100 {ks} effective exposure time by XMM-Newton. The observed pulsar flux in the 0.2-3 keV energy range is ∼ {10}-14 {erg} {cm}}-2 {{{s}}}-1, which results in the recording of ∼600 source counts with the EPIC pn and MOS …
Lighthouse in the dust: infrared echoes of periodic emission from massive black hole binaries★
Haiman, Zoltán; D'Orazio, Daniel J.
The optical and UV emission from sub-parsec massive black hole binaries (MBHBs) in active galactic nuclei (AGNs) is believed to vary periodically, on time-scales comparable to the binary's orbital time. If driven by accretion rate fluctuations, the variability could be isotropic. If dominated by relativistic Doppler modulation, the variability sho…
A revised moving cluster distance to the Pleiades open cluster
Bouy, H.; Bouvier, J.; Teixeira, R. +3 more
Context. The distance to the Pleiades open cluster has been extensively debated in the literature over several decades. Although different methods point to a discrepancy in the trigonometric parallaxes produced by the HIPPARCOS mission, the number of individual stars with known distances is still small compared to the number of cluster members to …