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NuSTAR Observations of G11.2-0.3
Fryer, C. L.; Grefenstette, B. W.; Madsen, K. K. +3 more
We present in this paper the hard X-ray view of the pulsar wind nebula in G11.2-0.3 and its central pulsar powered pulsar J1811-1925 as seen by NuSTAR. We complement the data with Chandra for a more complete picture and confirm the existence of a hard, power-law component in the shell with photon index ${\rm{\Gamma }}=2.1\pm 0.1$ , which we attrib…
Two Successive Type II Radio Bursts Associated with B-class Flares and Slow CMEs
Chen, Huadong; Ma, Suli
3 From 2018 Oct 12 to 13, three successive solar eruptions (E1-E3) with B-class flares and poor 4 white light coronal mass ejections (CMEs) occurred from the same active region NOAA AR 12724. 5 Interestingly, the first two eruptions are associated with Type II radio bursts but the third is not. 6 Using the soft X-ray flux data, radio dynamic spect…
Search for Zeeman-splitting of OH 6.035 GHz line in the young planetary nebula K 3-35
Hou, L. G.; Gao, X. Y.
Magnetic field could play a role in the formation and early evolution of non-spherical planetary nebulae (PNe). The predominant source of information of the magnetic fields in PNe is the polarization observations of maser emission. To date, distinct and/or possible Zeeman pairs have only been reported towards four PNe by measuring the OH ground-st…
Continuum Enhancements, Line Profiles, and Magnetic Field Evolution during Consecutive Flares
Mathioudakis, Mihalis; Murabito, Mariarita; Guglielmino, Salvo L. +5 more
During solar flares, magnetic energy can be converted into electromagnetic radiation from radio waves to γ-rays. Enhancements in the continuum at visible wavelengths, as well as continuum enhancements in the FUV and NUV passbands, give rise to white-light flares. In addition, the strong energy release in these events can lead to the rearrangement …
Observations of [OI]63 µm line emission in main-sequence galaxies at z 1.5
Daddi, E.; Valtchanov, I.; Walter, F. +9 more
We present Herschel-PACS spectroscopy of four main-sequence star-forming galaxies at z ~ 1.5. We detect [OI]63 µm line emission in BzK-21000 at z = 1.5213, and measure a line luminosity, $L_{\rm [O\, {\small I}]63\, \mu m} = (3.9\pm 0.7)\times 10^9$ L⊙. Our PDR modelling of the interstellar medium in BzK-21000 suggests a UV radiat…
Nearby Quintuple Systems κ Tucanae and ξ Scorpii
Tokovinin, Andrei
Architecture and parameters of two wide, nearby hierarchical systems containing five solar-type stars each, κ Tuc and ξ Sco, are studied. Using Gaia astrometry and photometry, masses are determined from visual orbits and isochrones, and effective temperatures from spectra or colors. Both systems are ∼2 Gyr old. Their spatial motion corresponds to …
VVV-WIT-01: highly obscured classical nova or protostellar collision?
Minniti, D.; Masetti, N.; Krause, M. +18 more
A search of the first Data Release of the VISTA Variables in the Via Lactea (VVV) Survey discovered the exceptionally red transient VVV-WIT-01 (H - Ks = 5.2). It peaked before March 2010, then faded by ∼9.5 mag over the following 2 yr. The 1.6-22 µm spectral energy distribution in March 2010 was well fit by a highly obscured black…
Models of bars - II. Exponential profiles
Evans, N. W.; Sanders, J. L.; McGough, D. P.
We present a new model for galactic bars with exponentially falling major axis luminosity profiles and Gaussian cross-sections. This is based on the linear superposition of Gaussian potential-density pairs with an exponential weight function, using an extension of the method originally introduced by Long & Murali. We compute the density, poten…
Circumstellar CO J = 3→2 detected around the evolving metal-poor ([Fe/H] ≈ -1.15 dex) AGB star RU Vulpeculae
Zijlstra, A. A.; Richards, A. M. S.; McDonald, I. +2 more
We report the first detection of CO J = 3→2 around a truly metal-poor evolved star. RU Vulpeculae is modelled to have Teff ≈ 3620 K, L ≈ 3128 ± 516 L⊙, log(g) = 0.0 ± 0.2 dex and [Fe/H] = -1.3 to -1.0 dex, and is modelled to have recently undergone a thermal pulse. Its infrared flux has approximately doubled over 35 yr. ALMA …
Exploring the nature and synchronicity of early cluster formation in the Large Magellanic Cloud - V. Multiple populations in ancient globular clusters
Ventura, Paolo; Cohen, Roger E.; Sarajedini, Ata +10 more
We examine four ancient Large Magellanic Cloud (LMC) globular clusters (GCs) for evidence of multiple stellar populations using the Advanced Camera for Surveys and Wide Field Camera 3 on the Hubble Space Telescope Programme GO-14164. NGC 1466, NGC 1841, and NGC 2257 all show evidence for a redder, secondary population along the main sequence. Reti…