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NGC 1866: First Spectroscopic Detection of Fast-rotating Stars in a Young LMC Cluster
Mateo, M.; Crane, J. D.; Milone, A. P. +6 more
High-resolution spectroscopic observations were taken of 29 extended main-sequence turnoff (eMSTO) stars in the young (∼200 Myr) Large Magellanic Cloud (LMC) cluster, NGC 1866, using the Michigan/Magellan Fiber System and MSpec spectrograph on the Magellan-Clay 6.5 m telescope. These spectra reveal the first direct detection of rapidly rotating st…
On the Early-time Excess Emission in Hydrogen-poor Superluminous Supernovae
Filippenko, Alexei V.; Cenko, S. Bradley; Sollerman, Jesper +27 more
We present the light curves of the hydrogen-poor superluminous supernovae (SLSNe I) PTF 12dam and iPTF 13dcc, discovered by the (intermediate) Palomar Transient Factory. Both show excess emission at early times and a slowly declining light curve at late times. The early bump in PTF 12dam is very similar in duration (∼10 days) and brightness relati…
Estimation of Reconnection Flux Using Post-eruption Arcades and Its Relevance to Magnetic Clouds at 1 AU
Gopalswamy, N.; Yashiro, S.; Xie, H. +1 more
We report on a new method to compute the flare reconnection (RC) flux from post-eruption arcades (PEAs) and the underlying photospheric magnetic fields. In previous works, the RC flux has been computed using the cumulative flare ribbon area. Here we obtain the RC flux as the flux in half of the area underlying the PEA in EUV imaged after the flare…
Axion-like particles and recent observations of the cosmic infrared background radiation
Kohri, Kazunori; Kodama, Hideo
The CIBER collaboration released their first observational data of the Cosmic IR background (CIB) radiation, which has significant excesses at around the wavelength ∼1 µ m compared to theoretically-inferred values. The amount of the CIB radiation has a significant influence on the opaqueness of the Universe for TeV gamma-rays emitted from di…
Galaxy populations in massive galaxy clusters to z = 1.1: colour distribution, concentration, halo occupation number and red sequence fraction
Benoit-Lévy, A.; D'Andrea, C. B.; Zenteno, A. +70 more
We study the galaxy populations in 74 Sunyaev-Zeldovich effect selected clusters from the South Pole Telescope survey, which have been imaged in the science verification phase of the Dark Energy Survey. The sample extends up to z ∼ 1.1 with 4 × 1014 M⊙ ≤ M200 ≤ 3 × 1015M⊙. Using the band conta…
The WISSH quasars project. II. Giant star nurseries in hyper-luminous quasars
Fiore, F.; Bianchi, S.; Martocchia, S. +12 more
Context. Studying the coupling between the energy output produced by the central quasar and the host galaxy is fundamental to fully understand galaxy evolution. Quasar feedback is indeed supposed to dramatically affect the galaxy properties by depositing large amounts of energy and momentum into the interstellar medium (ISM).
Aims: In order t…
XMMSL1 J074008.2-853927: a tidal disruption event with thermal and non-thermal components
Wieringa, M. H.; Read, A. M.; Komossa, S. +3 more
Aims: We study X-ray bright tidal disruption events (TDE), close to the peak of their emission, with the intention of understanding the evolution of their light curves and spectra.
Methods: Candidate TDE are identified by searching for soft X-ray flares from non-active galaxies in recent XMM-Newton slew data.
Results: In April 2014,…
A new, faint population of X-ray transients
Yang, Guang; Brandt, William N.; Schneider, Donald P. +22 more
We report on the detection of a remarkable new fast high-energy transient found in the Chandra Deep Field-South, robustly associated with a faint (mR = 27.5 mag, zph ∼ 2.2) host in the CANDELS survey. The X-ray event is comprised of 115^{+12}_{-11} net 0.3-7.0 keV counts, with a light curve characterized by an ≈100 s rise tim…
A STEREO Survey of Magnetic Cloud Coronal Mass Ejections Observed at Earth in 2008-2012
Howard, Russell A.; Linton, Mark G.; Wood, Brian E. +4 more
We identify coronal mass ejections (CMEs) associated with magnetic clouds (MCs) observed near Earth by the Wind spacecraft from 2008 to mid-2012, a time period when the two STEREO spacecraft were well positioned to study Earth-directed CMEs. We find 31 out of 48 Wind MCs during this period can be clearly connected with a CME that is trackable in S…
Pulsar-Wind Nebulae and Magnetar Outflows: Observations at Radio, X-Ray, and Gamma-Ray Wavelengths
Mereghetti, Sandro; Reynolds, Stephen P.; Pavlov, George G. +3 more
We review observations of several classes of neutron-star-powered outflows: pulsar-wind nebulae (PWNe) inside shell supernova remnants (SNRs), PWNe interacting directly with interstellar medium (ISM), and magnetar-powered outflows. We describe radio, X-ray, and gamma-ray observations of PWNe, focusing first on integrated spectral-energy distributi…