Search Publications
Hubble Frontier Field free-form mass mapping of the massive multiple-merging cluster MACSJ0717.5+3745
Broadhurst, Tom; Zheng, Wei; Zitrin, Adi +4 more
We examine the latest data on the cluster MACSJ0717.5+3745 from the Hubble Frontier Fields campaign. The critically lensed area is the largest known of any lens and very irregular making it a challenge for parametric modelling. Using our free-form method we obtain an accurate solution, identify here many new sets of multiple images, doubling the n…
A powerful double radio relic system discovered in PSZ1 G108.18-11.53: evidence for a shock with non-uniform Mach number?
van Weeren, R. J.; Bonafede, A.; Brüggen, M. +5 more
Diffuse radio emission in the form of radio haloes and relics has been found in a number of merging galaxy clusters. These structures indicate that shock and turbulence associated with the merger accelerate electrons to relativistic energies. We report the discovery of a radio relic + radio halo system in PSZ1 G108.18-11.53 (z = 0.335). This clust…
The 2MIG isolated AGNs - I. General and multiwavelength properties of AGNs and host galaxies in the northern sky
Babyk, Iu.; Sawangwit, U.; Klimanov, S. +2 more
The host isolated galaxies with active galactic nuclei (AGNs) are unique for recognizing their internal multiwavelength properties and physical parameters of accretion on the supermassive black holes outside of the environment. For detaching these effects, we studied the galaxy sample obtained by cross-matching the 2MIG (2MASS isolated galaxy) cat…
Stellar models of multiple populations in globular clusters - I. The main sequence of NGC 6752
Conroy, Charlie; Dotter, Aaron; Milone, A. P. +3 more
We present stellar atmosphere and evolution models of main-sequence stars in two stellar populations of the Galactic globular cluster NGC 6752. These populations represent the two extremes of light-element abundance variations in the cluster. NGC 6752 is a benchmark cluster in the study of multiple stellar populations because of the rich array of …
The most powerful flaring activity from the NLSy1 PMN J0948+0022
Larsson, J.; Fortin, P.; Benbow, W. +73 more
We report on multifrequency observations performed during 2012 December-2013 August of the first narrow-line Seyfert 1 galaxy detected in γ-rays, PMN J0948+0022 (z = 0.5846). A γ-ray flare was observed by the Large Area Telescope on board Fermi during 2012 December-2013 January, reaching a daily peak flux in the 0.1-100 GeV energy range of (155 ± …
UNIMAP: a generalized least-squares map maker for Herschel data
Elia, Davide; Molinari, Sergio; Pezzuto, Stefano +5 more
The Herschel space telescope hosts two infrared photometers having an unprecedented resolution, sensitivity and dynamic range. The map making, i.e. the formation of sky images from the instruments' data, is critical for the full exploitation of the satellite and is a difficult task, since the readouts are affected by several disturbances, most not…
Multiwavelength observations of the transitional millisecond pulsar binary XSS J12270-4859
Belloni, T.; de Martino, D.; Rea, N. +7 more
We present an analysis of X-ray, ultraviolet and optical/near-IR photometric data of the transitional millisecond pulsar binary XSS J12270-4859, obtained at different epochs after the transition to a rotation-powered radio pulsar state. The observations, while confirming the large-amplitude orbital modulation found in previous studies after the st…
The radiative efficiency of a radiatively inefficient accretion flow
Messenger, C.; Patruno, A.; D'Angelo, C. R. +1 more
A recent joint XMM-Newton/Nuclear Spectroscopic Telescope Array (NuSTAR) observation of the accreting neutron star Cen X-4 (LX ∼ 1033 erg s-1) revealed a hard power-law component (Γ ∼ 1-1.5) with a relatively low cut-off energy (∼10 keV), suggesting bremsstrahlung emission. The physical requirements for bremsstrahl…
Did the progenitor of SN 2011dh have a binary companion?★
Cenko, S. B.; Horesh, A.; Maund, J. R. +6 more
We present late-time Hubble Space Telescope ultraviolet (UV) and optical observations of the site of SN 2011dh in the galaxy M51, ∼1164 days post-explosion. At the supernova (SN) location, we observe a point source that is visible at all wavelengths, which is significantly fainter than the spectral energy distribution (SED) of the yellow supergian…
The dark matter haloes of moderate luminosity X-ray AGN as determined from weak gravitational lensing and host stellar masses
Schramm, Malte; Elvis, Martin; Leauthaud, Alexie +9 more
Understanding the relationship between galaxies hosting active galactic nuclei (AGN) and the dark matter haloes in which they reside is key to constraining how black hole fuelling is triggered and regulated. Previous efforts have relied on simple halo mass estimates inferred from clustering, weak gravitational lensing, or halo occupation distribut…