Search Publications
The disc-dominated host galaxy of FR-I radio source B2 0722+30
Morganti, R.; Tadhunter, C. N.; Holt, J. +4 more
We present new observational results that conclude that the nearby radio galaxy B2 0722+30 is one of the very few known disc galaxies in the low-redshift Universe that host a classical double-lobed radio source. In this paper, we use HI observations, deep optical imaging, stellar population synthesis modelling and emission-line diagnostics to stud…
Cluster observations of earthward propagating plasmoid and flux ropes in the near-tail during the course of a substorm event
Tang, C. L.; Lu, L.; Li, Z. Y.
We analyze the magnetic structures in the near-tail at XGSM = -17.5 RE on September 19, 2003 by Cluster. During the course of a substorm event, the earthward propagating plasmoid and flux ropes in the near-tail are observed. The earthward propagating plasmoid is associated with the bipolar Bz and By signatures. The two flux ropes are embedded with…
Constraining Dust and Color Variations of High-z SNe Using NICMOS on the Hubble Space Telescope
Panagia, N.; Lidman, C.; Nugent, P. E. +24 more
We present data from the Supernova Cosmology Project for five high redshift Type Ia supernovae (SNe Ia) that were obtained using the NICMOS infrared camera on the Hubble Space Telescope. We add two SNe from this sample to a rest-frame I-band Hubble diagram, doubling the number of high redshift supernovae on this diagram. This I-band Hubble diagram…
Water masers in the Saturnian system
Gurvits, L. I.; Pogrebenko, S. V.; Mujunen, A. +11 more
Context: The presence of water has long been seen as a key condition for life in planetary environments. The Cassini spacecraft discovered water vapour in the Saturnian system by detecting absorption of UV emission from a background star. Investigating other possible manifestations of water is essential, one of which, provided physical conditions …
The ultraviolet flare at the center of the elliptical galaxy NGC 4278
Morelli, L.; Buson, L. M.; Beifiori, A. +5 more
Context: A large fraction of otherwise normal galaxies shows a weak nuclear activity. One of the signatures of the low-luminosity active galactic nuclei (LLAGNs) is ultraviolet variability which was serendipitously discovered in the center of some low-ionization nuclear emission-line region (LINER) galaxies.
Aims: There is a pressing need to a…
A Comparison of the Initial Speed of Coronal Mass Ejections with the Magnetic Flux and Magnetic Helicity of Magnetic Clouds
Sung, S. -K.; Marubashi, K.; Cho, K. -S. +5 more
To investigate the relationship between the speed of a coronal mass ejection (CME) and the magnetic energy released during its eruption, we have compared the initial speed of CMEs (V CME) and the two parameters of their associated magnetic clouds (MC), magnetic flux (F MC), and magnetic helicity per unit length (|H MC
Spatially Resolved Stellar Populations of Eight Goods-South Active Galactic Nuclei at z ~ 1
Koo, David C.; Ammons, S. Mark; Melbourne, Jason +2 more
We present a pilot study of the stellar populations of eight active galactic nucleus (AGN) hosts at z ~ 1 and compare with (1) lower redshift samples and (2) a sample of nonactive galaxies of similar redshift. We utilize K' images in the Great Observatories Origins Deep Survey South field obtained with the laser guide star adaptive optics system a…
NGC 1275: Baryonic cycling in the Perseus cluster of galaxies
Gallagher, J. S.
NGC 1275, the central galaxy of the Perseus cluster, contains a remarkable cool ISM. This gas is arrayed in a series of filaments extending over 30 kpc with an extension of 70 kpc to the north. These emit substantial cooling line radiation from H II, a hot H_2 zone, and CO in a cool molecular region which contains most of the gas mass. This contri…
Remote sensing of local structure of the quasi-perpendicular Earth's bow shock by using field-aligned beams
Lucek, E. A.; Kucharek, H.; Möbius, E. +4 more
Field-aligned ion beams (FABs) originate at the quasi-perpendicular Earth's bow shock and constitute an important ion population in the foreshock region. The bulk velocity of these FABs depends significantly on the shock normal angle, which is the angle between shock normal and upstream interplanetary magnetic field (IMF). This dependency may ther…
Large-scale horizontal flows in the solar photosphere. V. Possible evidence for the disconnection of bipolar sunspot groups from their magnetic roots
Švanda, M.; Sobotka, M.; Klvaňa, M.
In a recent paper (Švanda et al. 2008, A&A, 477, 285) we pointed out that, based on the tracking of Doppler features in the full-disc MDI Dopplergrams, the active regions display two dynamically different regimes. We speculated that this could be a manifestation of the sudden change in the active regions dynamics, caused by the dynamic disconn…