Search Publications
The missing link: a low-mass X-ray binary in M31 seen as an ultraluminous X-ray source
Done, Chris; Middleton, Matthew J.; Sutton, Andrew D. +2 more
A new, transient ultraluminous X-ray source (ULX) was recently discovered by Chandra in M31 with a luminosity at ∼5 × 1039 erg s-1. Here we analyse a series of five subsequent XMM-Newton observations. These show a steady decline in X-ray luminosity over 1.5 months, from 1.8 × 1039 to 0.6 × 1039 erg s
X-ray observations of the galaxy cluster Abell 2029 to the virial radius
Fabian, A. C.; Sanders, J. S.; Walker, S. A. +2 more
We present Suzaku observations of the galaxy cluster Abell 2029, which exploit Suzaku's low particle background to probe the intracluster medium at radii beyond that which is possible with previous observations, and with better azimuthal coverage. We find significant anisotropies in the temperature and entropy profiles, with a region of lower temp…
Discovery of a Be/X-ray pulsar binary and associated supernova remnant in the Wing of the Small Magellanic Cloud
Gruendl, R. A.; Gallagher, J. S., III; Chu, Y. -H. +6 more
We report on a new Be/X-ray pulsar binary located in the Wing of the Small Magellanic Cloud (SMC). The strong pulsed X-ray source was discovered with the Chandra and XMM-Newton X-ray observatories. The X-ray pulse period of 1062 s is consistently determined from both Chandra and XMM-Newton observations, revealing one of the slowest rotating X-ray …
Quantifying the faint structure of galaxies: the late-type spiral NGC 2403
Jablonka, P.; Ferguson, Annette M. N.; Irwin, M. J. +2 more
Ground-based surveys have mapped the stellar outskirts of Local Group disc galaxies in unprecedented detail, but extending this work to other galaxies is necessary in order to overcome stochastic variations in evolutionary history and provide more stringent constraints on cosmological galaxy formation models. As part of our continuing programme of…
The similarity of broad iron lines in X-ray binaries and active galactic nuclei
Fabian, A. C.; Miller, J. M.; Reis, R. C. +2 more
We have compared the 2001 XMM-Newton spectra of the stellar mass black hole binary XTE J1650-500 and the active galaxy MCG-6-30-15, focusing on the broad, excess emission features at ∼4-7 keV displayed by both sources. Such features are frequently observed in both low-mass X-ray binaries and active galactic nuclei (AGN). For the former case it is …
Deep observations of CO line emission from star-forming galaxies in a cluster candidate at z=1.5
Finoguenov, A.; Berta, S.; Magnelli, B. +20 more
We report results from a deep Jansky Very Large Array (JVLA) search for 12CO J = 1-0 line emission from galaxies in a candidate galaxy cluster at z ∼ 1.55 in the COSMOS field. We target four galaxies with optical spectroscopic redshifts in the range z = 1.47-1.59, consistent with the likely redshift for the candidate galaxy cluster. Two…
The X-ray reflector in NGC 4945: a time- and space-resolved portrait
Bianchi, S.; Elvis, M.; Fabbiano, G. +5 more
We present a time, spectral and imaging analysis of the X-ray reflector in NGC 4945, which reveals its geometrical and physical structure with unprecedented detail. NGC 4945 hosts one of the brightest AGN in the sky above 10 keV, but it is only visible through its reflected/scattered emission below 10 keV, due to absorption by a column density of …
Discovery of multiphase cold accretion in a massive galaxy at z = 0.7
Kacprzak, Glenn G.; Spitler, Lee R.; Steidel, Charles C. +2 more
We present detailed photo+collisional ionization models and kinematic models of the multiphase absorbing gas, detected within the Hubble Space Telescope(HST)/COS, HST/STIS and Keck/HIRES spectra of the background quasar TON 153 at 104 kpc along the projected minor axis of a star-forming spiral galaxy (z = 0.6610). Complementary g'r'i'Ks photometry…
Substructure in the most massive GEEC groups: field-like populations in dynamically active groups
Mulchaey, John S.; Balogh, Michael L.; Harris, William E. +6 more
The presence of substructure in galaxy groups and clusters is believed to be a sign of recent galaxy accretion and can be used to probe not only the assembly history of these structures, but also the evolution of their member galaxies. Using the Dressler-Shectman (DS) test, we study substructure in a sample of intermediate-redshift (z∼ 0.4) galaxy…
The Gaia spectrophotometric standard stars survey - I. Preliminary results
Jordi, C.; Monguió, M.; Figueras, F. +23 more
We describe two ground-based observing campaigns aimed at building a grid of approximately 200 spectrophotometric standard stars (SPSS), with an internal ≃1 per cent precision and tied to Vega within ≃3 per cent, for the absolute flux calibration of data gathered by Gaia, the European Space Agency (ESA) astrometric mission. The criteria for the se…