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Rest-frame UV and optical emission line diagnostics of ionized gas properties: a test case in a star-forming knot of a lensed galaxy at z ∼ 1.7
Kewley, Lisa J.; Blanc, Guillermo A.; Acharyya, Ayan +7 more
We examine the diagnostic power of rest-frame ultraviolet (UV) nebular emission lines, and compare them to more commonly used rest-frame optical emission lines, using the test case of a single star-forming knot of the bright lensed galaxy RCSGA 032727-132609 at redshift z ∼ 1.7. This galaxy has complete coverage of all the major rest-frame UV and …
Multiwavelength Investigation of Pulsar Wind Nebula DA 495 with HAWC, VERITAS, and NuSTAR
Zhang, H.; Li, H.; Gotthelf, E. V. +10 more
Pulsar wind nebula DA 495 (G65.7+1.2) was detected in TeV gamma-rays by the High Altitude Water Cerenkov Observatory in 2017 (2HWC J1953+294). Follow-up observations by the Very Energetic Radiation Imaging Telescope Array System confirmed the association between 2HWC J1953+294 and DA 495 and found the TeV emission to be spatially coincident with t…
Nonthermal Emission from the Interaction of Magnetized Exoplanets with the Wind of Their Host Star
Loeb, Abraham; Wang, Xiawei
We study the nonthermal emission from the interaction between magnetized Jupiter-like exoplanets and the wind from their host star. The supersonic motion of planets through the wind forms a bow shock that accelerates electrons that produce nonthermal radiation across a broad wavelength range. We discuss three wind mass-loss rates: {\dot{M}}{{…
Temporal and spectral X-ray properties of magnetar SGR 1900+14 derived from observations with NuSTAR and XMM-Newton
Enoto, Teruaki; Bamba, Aya; Odaka, Hirokazu +1 more
X-ray observations play a crucial role in understanding the emission mechanism and relevant physical phenomena of magnetars. We report on X-ray observations made in 2016 of a young magnetar, SGR 1900+14, which is famous for a giant flare in 1998 August. Simultaneous observations were conducted with XMM-Newton and NuSTAR on 2016 October 20 with 23 …
Equatorial Propagation of the Magnetosonic Mode Across the Plasmapause: 2-D PIC Simulations
Boardsen, Scott A.; Liu, Kaijun; Denton, Richard E. +2 more
Recent studies have indicated that fast magnetosonic waves (also referred to as equatorial noise) excited far outside the plasmapause cannot propagate deep into the plasmasphere because of the preferential azimuthal propagation of the waves at the source region. Since conditions in the low-density plasma trough are typically favorable for the wave…
A newly discovered double-double candidate microquasar in NGC 300
Maccarone, T. J.; Motch, C.; Scaringi, S. +7 more
We present the discovery of a powerful candidate microquasar in NGC 300, associated with the S 10 optical nebula (previously classified as a supernova remnant). Chandra images show four discrete X-ray knots aligned in the plane of the sky over a length of ≈150 pc. The X-ray emission from the knots is well fitted with a thermal plasma model at a te…
Broadband spectral analysis of MXB 1659-298 in its soft and hard state
Sanna, A.; Di Salvo, T.; Burderi, L. +7 more
Context. The X-ray transient eclipsing source MXB 1659-298 went into outburst in 1999 and 2015. During these two outbursts the source was observed by XMM-Newton, NuSTAR, and Swift/XRT.
Aims: Using these observations, we studied the broadband spectrum of the source to constrain the continuum components and to verify whether it had a reflection…
Cross-correlation of CMB Polarization Lensing with High-z Submillimeter Herschel-ATLAS Galaxies
Baccigalupi, C.; Borrill, J.; Stompor, R. +46 more
We report a 4.8σ measurement of the cross-correlation signal between the cosmic microwave background (CMB) lensing convergence reconstructed from measurements of the CMB polarization made by the POLARBEAR experiment and the infrared-selected galaxies of the Herschel-ATLAS survey. This is the first measurement of its kind. We infer a best-fit galax…
Ultralow-amplitude RR Lyrae Stars in M4
Wallace, Joshua J.; Hartman, Joel D.; Bakos, Gáspár Á. +1 more
We report evidence for a new class of variable star, which we dub millimagnitude RR Lyrae (mmRR). From K2 observations of the globular cluster M4, we find that out of 24 horizontal branch stars not previously known to be RR Lyrae variables, two show photometric variability with periods and shapes consistent with those of first-overtone RR Lyrae va…
A short and sudden increase of the magnetic field strength and the accompanying spectral variability in the O9.7 V star HD 54879
Hubrig, S.; Schöller, M.; Järvinen, S. P. +4 more
Only 11 O-type stars have been confirmed to possess large-scale organized magnetic fields. The presence of a -600 G longitudinal magnetic field in the O9.7 V star HD 54879 with a lower limit of the dipole strength of ∼2 kG was discovered a few years ago in the framework of the ESO large program `B-fields in OB stars'. Our FORS 2 spectropolarimetri…