Search Publications
A new radio census of neutron star X-ray binaries
Maccarone, T. J.; Degenaar, N.; Wijnands, R. +16 more
We report new radio observations of a sample of 36 neutron star (NS) X-ray binaries, more than doubling the sample in the literature observed at current-day sensitivities. These sources include 13 weakly magnetized (B < 1010 G) and 23 strongly magnetized (B ≥ 1010 G) NSs. 16 of the latter category reside in high-mass X-ray…
Systematic KMTNet Planetary Anomaly Search. I. OGLE-2019-BLG-1053Lb, a Buried Terrestrial Planet
Han, Cheongho; Udalski, Andrzej; Lee, Chung-Uk +71 more
In order to exhume the buried signatures of "missing planetary caustics" in Korea Microlensing Telescope Network (KMTNet) data, we conducted a systematic anomaly search of the residuals from point-source point-lens fits, based on a modified version of the KMTNet EventFinder algorithm. This search revealed the lowest-mass-ratio planetary caustic to…
The UV-brightest Lyman continuum emitting star-forming galaxy
Pérez-Fournon, I.; Schaerer, D.; Marques-Chaves, R. +5 more
We report the discovery of J0121+0025, an extremely luminous and young star-forming galaxy (MUV = -24.11, log[$L_{\rm Ly \alpha } / \rm erg~s^{-1}] = 43.8$) at z = 3.244 showing copious Lyman continuum (LyC) leakage ($f_{\rm esc, abs} \approx 40{{\ \rm per\ cent}}$). High signal-to-noise ratio rest-frame UV spectroscopy with the Gran Te…
Lyman-α constraints on cosmic heating from dark matter annihilation and decay
Slatyer, Tracy R.; Liu, Hongwan; Qin, Wenzer +1 more
We derive new constraints on models of decaying and annihilating dark matter (DM) by requiring that the energy injected into the intergalactic medium (IGM) not overheat it at late times, when measurements of the Lyman-α forest constrain the IGM temperature. We improve upon previous analyses by using the recently developed DarkHistory code package,…
A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE). IX. The effects of ram pressure stripping down to the scale of individual HII regions in the dwarf galaxy IC 3476
Ferrarese, L.; Boquien, M.; Galbany, L. +25 more
We study the IB(s)m galaxy IC 3476 observed in the context of the Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE), a blind narrow-band Hα+[NII] imaging survey of the Virgo cluster carried out with MegaCam at the CFHT. The deep narrow-band image reveals a very pertubed ionised gas distribution that is characterised by a prominent …
Chemical evidence for planetary ingestion in a quarter of Sun-like stars
Bedell, Megan; Casey, Andrew R.; Carlos, Marília +5 more
Stellar members of binary systems are formed from the same material, and therefore they should be chemically identical. However, recent studies have unveiled chemical differences between the two members of binary pairs composed of Sun-like stars. These chemically inhomogeneous binaries represent one of the most contradictory examples in stellar as…
The quasar feedback survey: discovering hidden Radio-AGN and their connection to the host galaxy ionized gas
Thomson, A. P.; Alexander, D. M.; Mainieri, V. +18 more
We present the first results from the Quasar Feedback Survey, a sample of 42 z < 0.2, [O III] luminous AGNs ( L[O III] > 1042.1 ergs s-1) with moderate radio luminosities (i.e. L1.4GHz > 1023.4 W Hz-1; median L1.4GHz = 5.9 × 1023 W Hz-1). Us…
RoboPol: AGN polarimetric monitoring data
Pearson, T. J.; Papadakis, I.; Blinov, D. +29 more
We present uniformly reprocessed and re-calibrated data from the RoboPol programme of optopolarimetric monitoring of active galactic nuclei (AGNs), covering observations between 2013, when the instrument was commissioned, and 2017. In total, the data set presented in this paper includes 5068 observations of 222 AGN with Dec. > -25○. …
Dwarf Galaxies in the MATLAS Survey: Hubble Space Telescope Observations of the Globular Cluster System in the Ultra-diffuse Galaxy MATLAS-2019
Emsellem, Eric; Müller, Oliver; Agnello, Adriano +11 more
Ultra-diffuse galaxies (UDGs) are very-low-surface-brightness galaxies with large effective radii. Spectroscopic measurements of a few UDGs have revealed a low dark-matter content based on the internal motion of stars or globular clusters (GCs). This is in contrast to the large number of GCs found for these systems, from which it would be expected…
White Dwarf Subsystems in Core-Collapsed Globular Clusters
Rui, Nicholas Z.; Rodriguez, Carl L.; Chatterjee, Sourav +5 more
Numerical and observational evidence suggests that massive white dwarfs dominate the innermost regions of core-collapsed globular clusters by both number and total mass. Using NGC 6397 as a test case, we constrain the features of white dwarf populations in core-collapsed clusters, both at present day and throughout their lifetimes. The dynamics of…