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A Pulsar Wind Nebula Embedded in the Kilonova AT 2017gfo Associated with GW170817/GRB 170817A
Liu, Tong; Lin, Da-Bin; Liang, En-Wei +5 more
The first detected gravitational wave GW170817 from a binary neutron star merger is associated with an important optical transient AT 2017gfo, which is a direct observation of kilonova. Recent observations suggest that the remnant compact object of the binary neutron star merger associated with GW170817/GRB 170817A may be a stable long-lived magne…
The PAU survey: star-galaxy classification with multi narrow-band data
Carretero, J.; Castander, F. J.; García-Bellido, J. +18 more
Classification of stars and galaxies is a well-known astronomical problem that has been treated using different approaches, most of them relying on morphological information. In this paper, we tackle this issue using the low-resolution spectra from narrow-band photometry, provided by the Physics of the Accelerating Universe survey. We find that, w…
Extended Aperture Photometry of K2 RR Lyrae stars
Skarka, Marek; Pope, Benjamin J. S.; Sódor, Ádám +6 more
The Kepler Space Telescope observed thousands of RR Lyrae stars in the K2 mission. In this paper, we present our photometric solutions using extended apertures in order to conserve the flux of the stars to the highest possible extent. With this method, we are able to avoid most of the problems that RR Lyrae light curves produced by other pipelines…
SPIRITS Catalog of Infrared Variables: Identification of Extremely Luminous Long Period Variables
Gehrz, R. D.; Bally, J.; Kasliwal, M. M. +12 more
We present a catalog of 417 luminous infrared variable stars with periods exceeding 250 days. These were identified in 20 nearby galaxies by the ongoing SPitzer InfraRed Intensive Transients Survey survey with the Spitzer Space Telescope. Of these, 359 variables have M [4.5] (phase-weighted mean magnitudes) fainter than -12 and periods …
Energetic Electron Acceleration in Unconfined Reconnection Jets
Xu, Y.; Zhang, Y.; Chen, G. +5 more
Magnetic reconnection in astronomical objects such as solar corona and the Earth’s magnetotail theoretically produces a fast jet toward the object (known as a confined jet as it connects to the object through magnetic field lines) and a fast jet departing the object (known as an unconfined jet as it propagates freely in space). So far, energetic e…
Is helium the key parameter in the extended colour spread of the first generation stars in M3?
Milone, A. P.; Cordoni, G.; Marino, A. F. +4 more
The study of the `chromosome maps' of Galactic globular clusters has shown that the stars identified as `first generation' often define an extended sequence in the mF275W - mF814W colour, whose straightforward interpretation, by comparison with synthetic spectra, is that they are inhomogeneous in helium content. The cluster M…
Possible depletion of metals into dust grains in the core of the Centaurus cluster of galaxies
Mernier, F.; Werner, N.; Lakhchaura, K.
We present azimuthally averaged metal abundance profiles from a full, comprehensive, and conservative re-analysis of the deep (∼800 ks total net exposure) Chandra/ACIS-S observation of the Centaurus cluster core (NGC 4696). After carefully checking various sources of systematic uncertainties, including the choice of the spectral deprojection metho…
Impacts of EUV Wavefronts on Coronal Structures in Homologous Coronal Mass Ejections
Wang, Yuming; Shen, Chenglong; Liu, Rui +1 more
Large-scale propagating fronts are frequently observed during solar eruptions, yet whether or not they are waves is an open question, partly because the propagation is modulated by coronal structures, whose magnetic fields we still cannot measure. However, when a front impacts coronal structures, an opportunity arises for us to look into the magne…
The time delay between star formation quenching and morphological transformation of galaxies in clusters: a phase-space view of EDisCS
Moustakas, John; Aragón-Salamanca, Alfonso; Milvang-Jensen, Bo +5 more
We explore the possible effect of cluster environments on the structure and star formation histories of galaxies by analysing the projected phase-space (PPS) of intermediate-redshift clusters (0.4 ≤ z ≤ 0.8). HST I-band imaging data from the ESO Distant Cluster Survey (EDisCS) allow us to measure deviations of the galaxies' light distributions fro…
The Wolf–Rayet Content of the Galaxies of the Local Group and Beyond
Massey, Philip; Neugent, Kathryn
Wolf–Rayet stars (WRs) represent the end of a massive star's life as it is about to turn into a supernova. Obtaining complete samples of such stars across a large range of metallicities poses observational challenges, but presents us with an exacting way to test current stellar evolutionary theories. A technique we have developed and refined invol…