Search Publications
New constraints on the complex mass substructure in Abell 1689 from gravitational flexion
Goldberg, David M.; Leonard, Adrienne; King, Lindsay J.
In a recent publication, the flexion aperture mass statistic was found to provide a robust and effective method by which substructure in galaxy clusters might be mapped. Moreover, we suggested that the masses and mass profile of structures might be constrained using this method. In this paper, we apply the flexion aperture mass technique to HST AC…
Cluster X-ray luminosity-temperature relation at z≳ 1.5
Andreon, S.; Trinchieri, G.; Pizzolato, F.
The evolution of the properties of the hot gas that fills the potential well of galaxy clusters is poorly known, since models are unable to give robust predictions, and observations lack a sufficient redshift leverage and are affected by selection effects. Here, with just two high-redshift, z≈ 1.8, clusters avoiding selection biases, we obtain a s…
The colour-magnitude relation of elliptical and lenticular galaxies in the ESO Distant Cluster Survey
Aragón-Salamanca, Alfonso; Zaritsky, Dennis; Jablonka, Pascale +4 more
In this paper we study the colour-magnitude relation (CMR) for a sample of 172 morphologically classified elliptical and S0 cluster galaxies from the ESO Distant Cluster Survey (EDisCS) at 0.4 ≲z≲ 0.8. The intrinsic colour scatter about the CMR is very small (<σint>= 0.076) in rest-frame U-V. However, there is a small minority of …
HerMES: SPIRE emission from radio-selected active galactic nuclei
Aussel, H.; Elbaz, D.; Pérez-Fournon, I. +60 more
We examine the rest-frame far-infrared emission from powerful radio sources with 1.4-GHz luminosity densities of 25 ≤ log(L1.4/W Hz-1) ≤ 26.5 in the extragalactic Spitzer First Look Survey field. We combine Herschel/SPIRE flux densities with Spitzer/Infrared Array Camera and Multiband Imaging Photometer for Spitzer infrared d…
Dust-correlated cm wavelength continuum emission from translucent clouds ζ Oph and LDN 1780
Bond, J. R.; Davies, R. D.; Davis, R. J. +17 more
The diffuse cm wave IR-correlated signal, the 'anomalous' CMB foreground, is thought to arise in the dust in cirrus clouds. We present Cosmic Background Imager (CBI) cm wave data of two translucent clouds, ζ Oph and LDN 1780 with the aim of characterizing the anomalous emission in the translucent cloud environment.
In ζ Oph, the measured brig…The red supergiants and Wolf-Rayet stars of NGC 604
Relaño, Mónica; Eldridge, John J.
We study the post-main-sequence stars in NGC 604, the most luminous H II region in M33. A number of Wolf-Rayet (WR) stars and one red supergiant (RSG) were discovered earlier. Based on the broad-band photometry of the region, we present evidence that is consistent with the presence of this RSG and with three more RSG candidates. Using spectral ene…
Violent interaction between the active galactic nucleus and the hot gas in the core of the galaxy cluster Sérsic 159-03
Simionescu, A.; Sun, M.; Allen, S. W. +7 more
We present a multiwavelength study of the energetic interaction between the central active galactic nucleus (AGN), the intracluster medium (ICM) and the optical emission-line nebula in the galaxy cluster Sérsic 159-03. We use X-ray data from Chandra, high-resolution X-ray spectra and ultraviolet (UV) images from XMM-Newton, Hα images from the Sout…
A broad-band X-ray view of the warm absorber in radio-quiet quasar MR 2251-178
Turner, T. J.; Kraemer, S. B.; Fukazawa, Y. +6 more
We present the analysis of a new broad-band X-ray spectrum (0.6-180.0 keV) of the radio-quiet quasar MR 2251-178 which uses both Suzaku and Swift/Burst Alert Telescope data. In accordance with previous observations, we find that the general continuum can be well described by a power law with Γ= 1.6 and an apparent soft excess below 1 keV. Warm abs…
The Vela and Geminga pulsars in the mid-infrared
Zharikov, S. V.; Shibanov, Yu. A.; Zyuzin, D. A. +1 more
The Vela and Geminga pulsars are rotation-powered neutron stars, which have been identified in various spectral domains, from the near-infrared to hard γ-rays. In the near-infrared, they exhibit tentative emission excesses, as compared to the optical range. To check whether these features are real, we analysed archival mid-infrared broad-band imag…
A 2D multiwavelength study of the ionized gas and stellar population in the giant H II region NGC 588
Monreal-Ibero, A.; Relaño, M.; Kehrig, C. +5 more
Giant H II regions (GHIIRs) in nearby galaxies are a local sample in which we can study in detail processes in the interaction of gas, dust and newly formed stars which are analogous to those which occurred in episodes of higher intensity in which much of the current stellar population was born. Here, we present an analysis of NGC 588, a GHIIR in …