Search Publications
Evidence for Three Accreting Black Holes in a Galaxy at z ~ 1.35: A Snapshot of Recently Formed Black Hole Seeds?
Schawinski, Kevin; Natarajan, Priyamvada; Treister, Ezequiel +3 more
One of the key open questions in cosmology today pertains to understanding when, where, and how supermassive black holes form. While it is clear that mergers likely play a significant role in the growth cycles of black holes, the issue of how supermassive black holes form, and how galaxies grow around them, still needs to be addressed. Here, we pr…
Suzaku View of X-Ray Spectral Variability of the Radio Galaxy Centaurus A: Partial Covering Absorber, Reflector, and Possible Jet Component
Fukazawa, Yasushi; Ohno, Masanori; Yamazaki, Syoko +6 more
We observed a nearby radio galaxy, Centaurus A (Cen A), three times with Suzaku in 2009 and measured the wide-band X-ray spectral variability more accurately than previous measurements. The Cen A was in an active phase in 2009, and the flux became higher by a factor of 1.5-2.0 and the spectrum became harder than that in 2005. The Fe-K line intensi…
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 Suzaku view of 3C 382
Ballo, L.; Reynolds, C. S.; Tombesi, F. +4 more
We present a long (116 ks) Suzaku observation of the broad-line radio galaxy (BLRG) 3C 382 acquired in 2007 April. A Swift BAT spectrum in 15-200 keV from the 58 month survey is also analyzed, together with an archival XMM-Newton EPIC exposure of 20 ks obtained one year after Suzaku. Our main result is the finding with Suzaku of a broad Fe K line …
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 …
Suzaku View of the Swift/BAT Active Galactic Nuclei. IV. Nature of Two Narrow-line Radio Galaxies (3C 403 and IC 5063)
Ueda, Yoshihiro; Terashima, Yuichi; Mushotzky, Richard F. +1 more
We report the results of Suzaku broadband X-ray observations of the two narrow-line radio galaxies, 3C 403 and IC 5063. Combined with the Swift/Burst Alert Telescope (BAT) spectra averaged for 58 months, we are able to accurately constrain their spectral properties over the 0.5-200 keV band. The spectra of both nuclei are well represented with an …
Large-amplitude whistler waves and electron acceleration
Yoon, Peter H.
A recent observation shows that large-amplitude whistler waves propagating obliquely with respect to the ambient magnetic field may be responsible for energizing the radiation belt electrons to relativistic energies (MeV) within a time scale as short as a fraction of a second. Test-particle simulations available in the literature invariably adopt …
The extinction map of the OMC-1 molecular cloud behind the Orion nebula
Robberto, M.; Scandariato, G.; Pagano, I. +1 more
Context. The Orion nebula and its associated young stellar cluster are located at the front-side of the optically thick
Solar cycle evolution of the heliospheric magnetic field: The Ulysses legacy
Smith, E. J.
Important contributions of Ulysses to understanding the solar cycle evolution of the heliospheric magnetic field (HMF) and solar wind are reviewed: a dramatic reorientation of the HMF as the solar dipole rotates between axial and equatorial orientations; solar cycle variation of the total heliospheric magnetic flux and its response to changes in s…
The γ Doradus CoRoT target HD 49434. II. Frequency analysis of the CoRoT data
Auvergne, M.; Amado, P. J.; Baudin, F. +18 more
Context. HD 49434 is a bright (V = 5.75 m) and multiperiodic γ Dor-type pulsator that has been selected for the asteroseismic core programme of the CoRoT satellite.
Aims: An extensive and detailed study has been carried out to investigate the pulsational content of this object on the basis of the 136.9 d (331291 useful datapoints) time series…