Search Publications
Sunyaev-Zel'dovich observations with AMI of the hottest galaxy clusters detected in the XMM-Newton Cluster Survey
Romer, A. Kathy; AMI Consortium; Olamaie, Malak +18 more
We have obtained deep Sunyaev-Zel'dovich (SZ) observations towards 15 of the hottest XMM Cluster Survey (XCS) clusters that can be observed with the Arcminute Microkelvin Imager (AMI). We use a Bayesian analysis to quantify the significance of our SZ detections. We detect the SZ effect at high significance towards three of the clusters and at lowe…
Optical observations of PSR J0205+6449 - the next optical pulsar?
de Luca, A.; Rea, N.; Mignani, R. P. +3 more
PSR J0205+6449 is a young (∼5400 yr), Crab-like pulsar detected in radio and at X-ray and γ-ray energies and has the third largest spin-down flux among known rotation-powered pulsars. It also powers a bright synchrotron nebula detected in the optical and X-rays. At a distance of ∼3.2 kpc and with an extinction comparable to the Crab, PSR J0205+644…
Do gravitational lens galaxies have an excess of luminous substructure?
Treu, T.; Nierenberg, A. M.; Oldenburg, D.
Strong gravitational lensing can be used to directly measure the mass function of their satellites, thus testing one of the fundamental predictions of cold dark matter cosmological models. Given the importance of this test, it is essential to ensure that galaxies acting as strong lenses have dark and luminous satellites which are representative of…
Red bulgeless galaxies in SDSS DR7. Are there any AGN hosts?
Ribeiro, B.; Coelho, B.; Antón, S. +1 more
With the main goal of finding bulgeless galaxies harbouring supermassive black holes and showing, at most, just residual star formation activity, we have selected a sample of massive bulgeless red sequence galaxies from the Sloan Digital Sky Survey - Data Release 7 (SDSS DR7), based on the New York University Value-Added Galaxy Catalogue. Multiwav…
Properties and morphologies of Lyman break galaxies at z ∼ 1 in the Chandra Deep Field South, inferred from spectral energy distributions
Buat, V.; Burgarella, D.; Huang, J. -S. +3 more
After carefully cross-identifying previously discovered - and selected by the Galaxy Evolution Explorer (GALEX) - Lyman break galaxy (LBG) candidates one-to-one with their optical counterparts in the field of the Chandra Deep Field South (CDF-S), we re-estimate their photometric redshifts using multiwavelength data from ultraviolet and optical to …
Aligned grains and inferred toroidal magnetic fields in the envelopes of massive young stellar objects
Schneider, Glenn; Hines, Dean C.; Wolff, Michael J. +6 more
Massive young stellar objects (YSOs), like low-mass YSOs, are thought to be surrounded by optically thick envelopes and/or discs and are observed to have associated regions that produce polarized light at near-infrared wavelengths. These polarized regions are thought to be lower density outflows along the polar axes of the YSO envelopes. Using the…
Mapping the complex kinematics of LL objects in the Orion nebula
O'Dell, C. R.; García-Díaz, Ma. T.; Henney, William J. +1 more
LL Orionis-type objects (LL objects) are hyperbolic bowshocks visible around young stars in the outer Orion nebula, many of which are also associated with curved, highly collimated jets. The bowshocks are clearly due to the supersonic interaction between an outflow from the young star and an environmental flow from the core of the nebula, but the …
Contrasting behaviour from two Be/ X-ray binary pulsars: insights into differing neutron star accretion modes
Hill, A. B.; Coe, M. J.; Bird, A. J. +4 more
In this paper we present the identification of two periodic X-ray signals coming from the direction of the Small Magellanic Cloud (SMC). On detection with the Rossi X-ray Timing Explorer (RXTE), the 175.4 s and 85.4 s pulsations were considered to originate from new Be/ X-ray binary (BeXRB) pulsars with unknown locations. Using rapid follow-up INT…
Extragalactic point source detection in Wilkinson Microwave Anisotropy Probe 7-year data at 61 and 94 GHz
de Zotti, G.; González-Nuevo, J.; Herranz, D. +4 more
The detection of point sources in cosmic microwave background maps is usually based on a single-frequency approach, whereby maps at each frequency are filtered separately and the spectral information on the sources is derived combining the results at the different frequencies. In contrast, in the case of multifrequency detection methods, source de…
Mid-infrared and X-ray luminosity correlations of X-ray point sources in NGC 1399
Shalima, P.; Jithesh, V.; Jeena, K. +5 more
It is known that the infrared (IR) and X-ray luminosities of active galactic nuclei (AGN) are correlated with LIR ∼ LX. Moreover, the IR flux ratio between the 5.8 and 3.6 µm bands is a good distinguishing characteristic of AGN or AGN-like behaviour. On the other hand, Galactic X-ray binaries (GXB) are underluminous in …