Search Publications
Imaging of diffuse H I absorption structure in the SSA22 protocluster region at z = 3.1
Ouchi, Masami; Inoue, Akio K.; Yamada, Toru +6 more
Using galaxies as background light sources to map intervening Ly α absorption is a novel approach to study the interplay among galaxies, the circumgalactic medium (CGM) and the intergalactic medium. Introducing a new measure of z = 3.1 H I Ly α absorption relative to the cosmic mean, ΔNB497, estimated from photometric data of star-forming galaxies…
Zooming into the Cosmic Horseshoe: new insights on the lens profile and the source shape
Metcalf, R. Benton; Tessore, Nicolas; Bellagamba, Fabio
The gravitational lens SDSS J1148+1930, also known as the Cosmic Horseshoe, is one of the biggest and most detailed Einstein rings ever observed. We use the forward reconstruction method implemented in the lens-fitting code LENSED to investigate in great detail the properties of the lens and background source. We model the lens with different mass…
Two-dimensional ice mapping of molecular cores
Pontoppidan, K. M.; Noble, J. A.; Fraser, H. J. +1 more
We present maps of the column densities of H2O, CO2 and CO ices towards the molecular cores B 35A, DC 274.2-00.4, BHR 59 and DC 300.7-01.0. These ice maps, probing spatial distances in molecular cores as low as 2200 au, challenge the traditional hypothesis that the denser the region observed, the more ice is present, providin…
Plasma waves confined to the diamagnetic cavity of comet 67P/Churyumov-Gerasimenko
Gunell, H.; Nilsson, H.; Hamrin, M. +11 more
Ion acoustic waves were observed in the diamagnetic cavity of comet 67P/Churyumov-Gerasimenko by the Rosetta spacecraft on 2015 August 3, when the comet was 1.25 au from the Sun. Wave spectra recorded by the Langmuir probe (RPC-LAP), peak near 200 Hz, decrease for higher frequencies and reach the noise floor at approximately 1.5 kHz. These waves w…
Disentangling the near-infrared continuum spectral components of the inner 500 pc of Mrk 573: two-dimensional maps
Kraemer, S. B.; Crenshaw, D. M.; Storchi-Bergmann, T. +5 more
We present a near-infrared (near-IR) study of the spectral components of the continuum in the inner 500 × 500 pc2 of the nearby Seyfert galaxy Mrk 573 using adaptive optics near-IR integral field spectroscopy with the instrument near-infrared integral field spectrograph of the Gemini North Telescope at a spatial resolution of ∼50 pc. We…
Hiding in plain sight - recovering clusters of galaxies with the strongest AGN in their cores
Magnier, E. A.; Waters, C.; Edge, A. C. +8 more
A key challenge in understanding the feedback mechanism of active galactic nucleus (AGN) in Brightest Cluster Galaxies (BCGs) is the inherent rarity of catching an AGN during its strong outburst phase. This is exacerbated by the ambiguity of differentiating between AGN and clusters in X-ray observations. If there is evidence for an AGN then the X-…
Post-perihelion photometry of dust grains in the coma of 67P Churyumov-Gerasimenko
Jorda, L.; Lara, L. M.; Bertaux, J. -L. +51 more
We present a photometric analysis of individual dust grains in the coma of comet 67P/Churyumov-Gerasimenko using OSIRIS images taken from 2015 July to 2016 January. We analysed a sample of 555 taken during 18 d at heliocentric distances ranging between 1.25 and 2.04 au and at nucleocentric distances between 80 and 437 km. An automated method to de…
Discovery of a soft X-ray 8 mHz QPO from the accreting millisecond pulsar IGR J00291+5934
Sanna, A.; Ferrigno, C.; Papitto, A. +7 more
We report on the analysis of the peculiar X-ray variability displayed by the accreting millisecond X-ray pulsar IGR J00291+5934 in a 80 ks-long joint NuSTAR and XMM-Newton observation performed during the source outburst in 2015. The light curve of the source is characterized by a flaring-like behaviour, with typical rise and decay time-scales of …
Study of the accretion torque during the 2014 outburst of the X-ray pulsar GRO J1744-28
Sanna, A.; Esposito, P.; Segreto, A. +9 more
We present the spectral and timing analysis of the X-ray pulsar GRO J1744-28 during its 2014 outburst using data collected with the X-ray satellites Swift, INTEGRAL, Chandra, and XMM-Newton. We derived, by phase-connected timing analysis of the observed pulses, an updated set of the source ephemeris. We were also able to investigate the spin-up of…
Stellar dynamics in the strong-lensing central galaxy of Abell 1201: a low stellar mass-to-light ratio, a large central compact mass and a standard dark matter halo
Edge, Alastair C.; Lucey, John R.; Smith, Russell J.
We analyse the stellar kinematics of the z = 0.169 brightest cluster galaxy in Abell 1201, using integral field observations acquired with the Multi-Unit Spectroscopic Explorer on the Very Large Telescope. This galaxy has a gravitationally lensed arc located at unusually small radius (∼5 kpc), allowing us to constrain the mass distribution using l…