Search Publications
Dipolar modulation in the size of galaxies: the effect of Doppler magnification
Bacon, David; Bonvin, Camille; Andrianomena, Sambatra +4 more
Objects falling into an overdensity appear larger on its near side and smaller on its far side than other objects at the same redshift. This produces a dipolar pattern of magnification, primarily as a consequence of the Doppler effect. At low redshift, this Doppler magnification completely dominates the usual integrated gravitational lensing contr…
Connecting X-ray absorption and 21 cm neutral hydrogen absorption in obscured radio AGN
Callingham, J. R.; Heywood, I.; Soria, R. +22 more
Many radio galaxies show the presence of dense and dusty gas near the active nucleus. This can be traced by both 21 cm H I absorption and soft X-ray absorption, offering new insight into the physical nature of the circumnuclear medium of these distant galaxies. To better understand this relationship, we investigate soft X-ray absorption as an indi…
Probing the interstellar dust towards the Galactic Centre: dust-scattering halo around AX J1745.6-2901
Haberl, Frank; Jin, Chichuan; Ponti, Gabriele +1 more
AX J1745.6-2901 is an X-ray binary located at only 1.45 arcmin from Sgr A⋆, showcasing a strong X-ray dust-scattering halo. We combine Chandra and XMM-Newton observations to study the halo around this X-ray binary. Our study shows two major thick dust layers along the line of sight (LOS) towards AX J1745.6-2901. The LOS position and N
Breaking news from the HST: the central star of the Stingray Nebula is now returning towards the AGB
Rauch, T.; Werner, K.; Todt, H. +2 more
SAO 244567 is a rare example of a star that allows us to witness stellar evolution in real time. Between 1971 and 1990, it changed from a B-type star into the hot central star of the Stingray Nebula. This observed rapid heating has been a mystery for decades, since it is in strong contradiction with the low mass of the star and canonical post-asym…
H2O and O2 absorption in the coma of comet 67P/Churyumov-Gerasimenko measured by the Alice far-ultraviolet spectrograph on Rosetta
Parker, Joel Wm.; Bertaux, Jean-Loup; Stern, S. Alan +10 more
We have detected H2O and O2 absorption against the far-UV continuum of stars located on lines of sight near the nucleus of Comet 67P/Churyumov-Gerasimenko using the Alice imaging spectrograph on Rosetta. These stellar appulses occurred at impact parameters of ρ = 4-20 km, and heliocentric distances ranging from Rh …
Multiband photometry and spectroscopy of an all-sky sample of bright white dwarfs
Geier, S.; Hermes, J. J.; Gänsicke, B. T. +11 more
The upcoming NASA Transiting Exoplanet Survey Satellite (TESS) will obtain space-based uninterrupted light curves for a large sample of bright white dwarfs distributed across the entire sky, providing a very rich resource for asteroseismological studies and the search for transits from planetary debris. We have compiled an all-sky catalogue of ult…
On the statistics of proto-cluster candidates detected in the Planck all-sky survey
Danese, L.; Dole, H.; Montier, L. +8 more
Observational investigations of the abundance of massive precursors of local galaxy clusters ('proto-clusters') allow us to test the growth of density perturbations, to constrain cosmological parameters that control it, to test the theory of non-linear collapse and how the galaxy formation takes place in dense environments. The Planck collaboratio…
Multicolour modelling of SN 2013dx associated with GRB 130702A★
Minaev, P. Yu.; Pozanenko, A. S.; Ehgamberdiev, Sh. A. +13 more
We present optical observations of SN 2013dx, related to the Fermi burst GRB 130702A, which occurred at red shift z = 0.145. It is the second-best sampled gamma-ray burst (GRB)/supernova (SN) after SN 1998bw. The observational light curves contain more than 280 data points in the uBgrRiz filters until 88 d after the burst, and the data were collec…
Observing the metal-poor solar neighbourhood: a comparison of galactic chemical evolution predictions*†
Jordan, C.; Soubiran, C.; Korotin, S. A. +15 more
Atmospheric parameters and chemical compositions for 10 stars with metallicities in the region of -2.2 < [Fe/H] < -0.6 were precisely determined using high-resolution, high signal-to-noise, spectra. For each star, the abundances, for 14-27 elements, were derived using both local thermodynamic equilibrium (LTE) and non-LTE (NLTE) approaches. …
The Fan Region at 1.5 GHz - I. Polarized synchrotron emission extending beyond the Perseus Arm
Leahy, J. P.; Gaensler, B. M.; McClure-Griffiths, N. M. +12 more
The Fan Region is one of the dominant features in the polarized radio sky, long thought to be a local (distance ≲500 pc) synchrotron feature. We present 1.3-1.8 GHz polarized radio continuum observations of the region from the Global Magneto-Ionic Medium Survey and compare them to maps of Hα and polarized radio continuum intensity from 0.408 to 35…