Search Publications
New insights on the puzzling LMXB 1RXS J180408.9-342058: the intermediate state, the clocked type-I X-ray bursts, and much more
Segreto, A.; Ferrigno, C.; Malzac, J. +7 more
1RXS J180408.9-342058 is a low-mass X-ray binary hosting a neutron star, which shows X-ray activity at very different mass-accretion regimes, from very faint to almost the Eddington luminosity. In this work, we present a comprehensive X-ray study of this source using data from the Neil Gehrels Swift Observatory, NuSTAR, and INTEGRAL/JEM-X. In orde…
Magnetic topologies of young suns: the weak-line T Tauri stars TWA 6 and TWA 8A
Donati, J. -F.; Alencar, S. H. P.; Hussain, G. A. J. +5 more
We present a spectropolarimetric study of two weak-line T Tauri stars (wTTSs), TWA 6, and TWA 8A, as part of the MaTYSSE (Magnetic Topologies of Young Stars and the Survival of close-in giant Exoplanets) programme. Both stars display significant Zeeman signatures that we have modelled using Zeeman Doppler Imaging (ZDI). The magnetic field of TWA 6…
Isochrone fitting of Galactic globular clusters - I. NGC 5904
Gontcharov, George A.; Mosenkov, Aleksandr V.; Khovritchev, Maxim Yu
We present new isochrone fits to colour-magnitude diagrams of the Galactic globular cluster NGC 5904 (M5). We utilize 29 photometric bands from the ultraviolet to mid-infrared by the use of the data from the Hubble Space Telescope, Gaia DR2, Wide-field Infrared Survey Explorer, Sloan Digital Sky Survey (SDSS), and other photometric data. In our is…
Exploring the nature and synchronicity of early cluster formation in the Large Magellanic Cloud - IV. Evidence for multiple populations in Hodge 11 and NGC 2210
Ventura, Paolo; Cohen, Roger E.; Sarajedini, Ata +10 more
We present a multiple population search in two old Large Magellanic Cloud (LMC) Globular clusters, Hodge 11 and NGC 2210. This work uses data from the Advanced Camera for Surveys and Wide Field Camera 3 on the Hubble Space Telescope from programme GO-14164 in Cycle 23. Both of these clusters exhibit a broadened main sequence with the second popula…
High-velocity string of knots in the outburst of the planetary nebula Hb4
Boumis, P.; Derlopa, S.; Akras, S. +1 more
The bipolar collimated outflows of the Hb4 planetary nebula (PN) exhibit an evident decrease in their expansion velocity with respect to the distance from the central star. So far, similar velocity law has also been found in Herbig-Haro objects. The interpretation of this peculiar velocity law and the classification of the outflows is the main foc…
AGN photoionization of gas in companion galaxies as a probe of AGN radiation in time and direction
Schawinski, Kevin; Keel, William C.; Moiseev, Alexei V. +9 more
We consider AGN photoionization of gas in companion galaxies (cross-ionization) as a way to sample the intensity of AGN radiation in both direction and time, independent of the gas properties of the AGN host galaxies. From an initial set of 212 AGN+companion systems, identified with the help of Galaxy Zoo participants, we obtained long-slit optica…
Variability studies and modelling of the blazar PKS 2155-304 in the light of a decade of multi-wavelength observations
Serpico, P. D.; Lenain, J. -P.; Maurin, G. +2 more
The variability of the high-frequency peaked BL Lac object PKS 2155-304 is studied using almost 10 years of optical, X-ray and γ-ray data. Publicly available data have been gathered and analysed with the aim to characterize the variability and to search for lognormality or periodic behaviour. The optical and X-ray range follow a lognormal process;…
Tidal disruption events from massive black hole binaries: predictions for ongoing and future surveys
Sesana, Alberto; Thorp, Stephen; Chadwick, Eli
We compute the expected cosmic rates of tidal disruption events (TDEs) induced by individual massive black holes (MBHs) and by MBH binaries (MBHBs) - with a specific focus on the latter class - to explore the potential of TDEs to probe the cosmic population of sub-pc MBHBs. Rates are computed by combining MBH and MBHB population models derived fro…
The complex evolution of the X-ray binary transient MAXI J1807+132 along the decay of its discovery outburst
Russell, D. M.; Armas Padilla, M.; Jiménez-Ibarra, F. +6 more
MAXI J1807+132 is an X-ray transient discovered during the decay of an outburst in 2017. We present optical and X-ray monitoring of the source over more than 125 d, from outburst to quiescence. The outburst decay is characterized by the presence of several reflares with a quasi-periodic recurrence time of ∼6.5 d. We detect broad H and He emission …
Quantifying the thermal Sunyaev-Zel'dovich effect and excess millimetre emission in quasar environments
Hilton, Matt; Sifón, Cristóbal; Battaglia, Nicholas +23 more
In this paper, we probe the hot, post-shock gas component of quasar-driven winds through the thermal Sunyaev-Zel'dovich (tSZ) effect. Combining data sets from the Atacama Cosmology Telescope, the Herschel Space Observatory, and the Very Large Array, we measure average spectral energy distributions of 109 829 optically selected, radio quiet quasars…