Search Publications
Interstellar Dust in the Solar System
Postberg, Frank; Altobelli, Nicolas; Sterken, Veerle J. +2 more
Interstellar dust from the Local Interstellar Cloud was detected unambiguously for the first time in 1992 (Grün et al. in Nature 362:428-430, 1993). Since then, great progress has been made in observing local interstellar dust in the Solar System using a variety of methods that, all together, provide complementary views of the dust particles from …
Discovery of a Double Blue Straggler Sequence in M15: New Insight into the Core-collapse Process
Knigge, C.; Dalessandro, E.; Beccari, G. +8 more
In this paper we report the discovery of a double blue straggler star (BSS) sequence in the core of the core-collapsed cluster M15 (NGC 7078). We performed a detailed photometric analysis of the extremely dense core of the cluster using a set of images secured with the Advanced Camera for Survey in the High Resolution Channel mode on board the Hub…
X-ray time lags in AGN: inverse-Compton scattering and spherical corona model
Chainakun, P.; Young, A. J.; Hancock, S. +1 more
We develop a physically motivated, spherical corona model to investigate the frequency-dependent time lags in active galactic nucleus (AGN). The model includes the effects of Compton up-scattering between the disc ultraviolet (UV) photons and coronal electrons, and the subsequent X-ray reverberation from the disc. The time lags are associated with…
Quasar lenses in the south: searches over the DES public footprint
Agnello, Adriano; Spiniello, Chiara
We have scanned 5000 deg2 of Southern Sky to search for strongly lensed quasars with five methods, all source oriented, but based on different assumptions and selection criteria. We present a list of high-grade candidates from each method (totalling 98 unique, new candidates), to facilitate follow-up spectroscopic campaigns, including t…
The Enigmatic (Almost) Dark Galaxy Coma P: Distance Measurement and Stellar Populations from HST Imaging
McQuinn, Kristen B. W.; Cannon, John M.; Dolphin, Andrew E. +9 more
We present Hubble Space Telescope (HST) observations of the low surface brightness (SB) galaxy Coma P. This system was first discovered in the Arecibo Legacy Fast ALFA H I survey and was cataloged as an (almost) dark galaxy because it did not exhibit any obvious optical counterpart in the available survey data (e.g., Sloan Digital Sky Survey). Sub…
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…