Search Publications
Probing within the Bondi radius of the ultramassive black hole in NGC 1600
Walker, S. A.; Runge, J.
We present deep (250 ks) Chandra observations of the nearby galaxy group NGC 1600, which has at its centre an ultramassive black hole (17 ± 1.5 billion M⊙). The exceptionally large mass of the black hole coupled with its low redshift makes it one of only a handful of black holes for which spatially resolved temperature and density profi…
The luminosity functions and redshift evolution of satellites of low-mass galaxies in the COSMOS survey
Roberts, Daniella M.; Nierenberg, Anna M.; Peter, Annika H. G.
The satellite populations of the Milky Way, and Milky Way mass galaxies in the local Universe, have been extensively studied to constrain dark matter and galaxy evolution physics. Recently, there has been a shift to studying satellites of hosts with stellar masses between that of the Large Magellanic Cloud and the Milky Way, since they can provide…
Constraining the cosmic UV background at z > 3 with MUSE Lyman-α emission observations
Richard, Johan; Marino, Raffaella Anna; Wisotzki, Lutz +10 more
The intensity of the Cosmic UV background (UVB), coming from all sources of ionizing photons such as star-forming galaxies and quasars, determines the thermal evolution and ionization state of the intergalactic medium (IGM) and is, therefore, a critical ingredient for models of cosmic structure formation. Most of the previous estimates are based o…
Hard X-ray selected giant radio galaxies - III. The LOFAR view
Venturi, T.; Dallacasa, D.; Ubertini, P. +12 more
Giant radio galaxies (GRGs), with extended structures reaching hundreds of kpc, are among the most spectacular examples of ejection of relativistic plasma from supermassive black holes. In this work, third of a series, we present Low-Frequency Array (LOFAR) images at 144 MHz, collected in the framework of the LOFAR Two-metre Sky Survey Data Releas…
Revisiting the Kepler field with TESS: Improved ephemerides using TESS 2 min data
Armstrong, David J.; Kunimoto, Michelle; Pollacco, Don +1 more
Up to date planet ephemerides are becoming increasingly important as exoplanet science moves from detecting exoplanets to characterizing their architectures and atmospheres in depth. In this work, ephemerides are updated for 22 Kepler planets and 4 Kepler planet candidates, constituting all Kepler planets and candidates with sufficient signal to n…
Baryon acoustic oscillations in the projected cross-correlation function between the eBOSS DR16 quasars and photometric galaxies from the DESI Legacy Imaging Surveys
Myers, Adam D.; Moustakas, John; Eisenstein, Daniel J. +19 more
We search for the baryon acoustic oscillations in the projected cross-correlation function binned into transverse comoving radius between the SDSS-IV DR16 eBOSS quasars and a dense photometric sample of galaxies selected from the DESI Legacy Imaging Surveys. We estimate the density of the photometric sample of galaxies in this redshift range to be…
Towards a better understanding of supernova environments: a study of SNe 2004dg and 2012P in NGC 5806 with HST and MUSE
Sun, Ning-Chen; Crowther, Paul A.; Zapartas, Emmanouil +2 more
Core-collapse supernovae (SNe) are the inevitable fate of most massive stars. Since most stars form in groups, SN progenitors can be constrained with information of their environments. It remains challenging to accurately analyse the various components in the environment and to correctly identify their relationships with the SN progenitors. Using …
The determination of asteroid H and G phase function parameters using Gaia DR2
Duffard, R.; Colazo, M.; Weidmann, W.
The Gaia mission will provide the scientific community with high-quality observations of asteroids of all categories. The second release of Gaia data (DR2) was published in 2018 and consists of 22 months of observations of 14 099 known Solar system objects, mainly asteroids. The purpose of this work is to obtain a catalogue of phase function param…
An H α/X-ray orphan cloud as a signpost of intracluster medium clumping
Yoshida, Michitoshi; Fossati, Matteo; Koda, Jin +12 more
Recent studies have highlighted the potential significance of intracluster medium (ICM) clumping and its important implications for cluster cosmology and baryon physics. Many of the ICM clumps can originate from infalling galaxies, as stripped interstellar medium (ISM) mixing into the hot ICM. However, a direct connection between ICM clumping and …
Evidence of chromospheric molecular hydrogen emission in a solar flare observed by the IRIS satellite
Fletcher, Lyndsay; Mulay, Sargam M.
We have carried out the first comprehensive investigation of enhanced line emission from molecular hydrogen, H2 at 1333.79 Å, observed at flare ribbons in SOL2014-04-18T13:03. The cool H2 emission is known to be fluorescently excited by Si IV 1402.77 Å UV radiation and provides a unique view of the temperature minimum region …