Search Publications
RPC observation of the development and evolution of plasma interaction boundaries at 67P/Churyumov-Gerasimenko
Coates, A. J.; Kallio, E.; Glassmeier, K. -H. +32 more
One of the primary objectives of the Rosetta Plasma Consortium, a suite of five plasma instruments on-board the Rosetta spacecraft, is to observe the formation and evolution of plasma interaction regions at the comet 67P/Churyumov-Gerasimenko (67P/CG). Observations made between 2015 April and 2016 February show that solar wind-cometary plasma inte…
The mass and spin of the extreme Narrow Line Seyfert 1 Galaxy 1H 0707-495 and its implications for the trigger for relativistic jets
Done, Chris; Jin, Chichuan
Relativistic reflection models of the X-ray spectrum of the `complex' Narrow Line Seyfert 1 (NLS1) 1H 0707-495 require a high-spin, moderate-inclination, low-mass black hole. With these parameters fixed, the observed optical/UV emission directly determines the mass accretion rate through the outer disc and hence predicts the bolometric luminosity.…
Furiously fast and red: sub-second optical flaring in V404 Cyg during the 2015 outburst peak
Altamirano, D.; Knigge, C.; Dhillon, V. S. +25 more
We present observations of rapid (sub-second) optical flux variability in V404 Cyg during its 2015 June outburst. Simultaneous three-band observations with the ULTRACAM fast imager on four nights show steep power spectra dominated by slow variations on ∼100-1000 s time-scales. Near the peak of the outburst on June 26, a dramatic change occurs and …
Baryon content of massive galaxy clusters at 0.57 < z < 1.33
Schrabback, T.; Zenteno, A.; Desai, S. +22 more
We study the stellar, brightest cluster galaxy (BCG) and intracluster medium (ICM) masses of 14 South Pole Telescope (SPT) selected galaxy clusters with median redshift z = 0.9 and mass M500 = 6 × 1014 M⊙. We estimate stellar masses for each cluster and BCG using six photometric bands, the ICM mass using X-ray obse…
Early science with the Large Millimeter Telescope: observations of extremely luminous high-z sources identified by Planck
Terlevich, E.; Terlevich, R.; Yun, Min S. +17 more
We present 8.5 arcsec resolution 1.1-mm continuum imaging and CO spectroscopic redshift measurements of eight extremely bright submillimetre galaxies identified from the Planck and Herschel surveys, taken with the Large Millimeter Telescope's AzTEC and Redshift Search Receiver instruments. We compiled a candidate list of high-redshift galaxies by …
A comprehensive comparative test of seven widely used spectral synthesis models against multi-band photometry of young massive-star clusters
Östlin, G.; Cignoni, M.; Calzetti, D. +13 more
We test the predictions of spectral synthesis models based on seven different massive-star prescriptions against Legacy ExtraGalactic UV Survey (LEGUS) observations of eight young massive clusters in two local galaxies, NGC 1566 and NGC 5253, chosen because predictions of all seven models are available at the published galactic metallicities. The …
Detecting direct collapse black holes: making the case for CR7
van den Bosch, Frank C.; Natarajan, Priyamvada; Zackrisson, Erik +4 more
We propose that one of the sources in the recently detected system CR7 by Sobral et al. through spectrophotometric measurements at z = 6.6 harbours a direct collapse black hole (DCBH). We argue that the LW radiation field required for direct collapse in source A is provided by sources B and C. By tracing the LW production history and star formatio…
A shock front at the radio relic of Abell 2744
Kneib, J. -P.; Eckert, D.; Vazza, F. +5 more
Radio relics are Mpc-scale diffuse radio sources at the peripheries of galaxy clusters which are thought to trace outgoing merger shocks. We present XMM-Newton and Suzaku observations of the galaxy cluster Abell 2744 (z = 0.306), which reveal the presence of a shock front 1.5 Mpc east of the cluster core. The surface-brightness jump coincides with…
Supervoids in the WISE-2MASS catalogue imprinting cold spots in the cosmic microwave background
Finelli, F.; Paci, F.; García-Bellido, J. +2 more
The Cold Spot (CS) is a clear feature in the cosmic microwave background (CMB); it could be of primordial origin, or caused by a intervening structure along the line of sight. We identified a large projected underdensity in the recently constructed WISE-2MASS all-sky infrared galaxy catalogue aligned with the CS direction at (l, b) ≈ (209°, -57°).…
Long-term observations of the pulsars in 47 Tucanae - I. A study of four elusive binary systems
van den Berg, M.; Heinke, C. O.; Camilo, F. +11 more
For the past couple of decades, the Parkes radio telescope has been regularly observing the millisecond pulsars in 47 Tucanae (47 Tuc). This long-term timing programme was designed to address a wide range of scientific issues related to these pulsars and the globular cluster where they are located. In this paper, the first of a series, we address …