Search Publications
Enceladus: An Active Cryovolcanic Satellite
Nimmo, Francis; Ingersoll, Andrew P.; Spencer, John R. +6 more
Enceladus is one of the most remarkable satellites in the solar system, as revealed by Cassini's detection of active plumes erupting from warm fractures near its south pole. This discovery makes Enceladus the only icy satellite known to exhibit ongoing internally driven geological activity. The activity is presumably powered by tidal heating maint…
The nucleus of NGC 253 and its massive stellar clusters at parsec scales
Prieto, M. A.; Acosta-Pulido, J. A.; Fernández-Ontiveros, J. A.
Very Large Telescope adaptive optics images of NGC 253 with resolutions down to 200mas resolve the central 300pc of this galaxy in ~37 infrared (IR) bright knots, a factor of 3 larger than previously reported and extended diffuse emission. The angular resolution, comparable to that of available Very Large Array 2cm maps, permits us a very accurate…
The jovian anticyclone BA. II. Circulation and interaction with the zonal jets
Hueso, R.; Sánchez-Lavega, A.; García-Melendo, E. +2 more
In this second part of our study of the large jovian anticyclone BA we present detailed measurements of its internal circulation and numerical models of its interaction with the zonal jets and nearby cyclonic regions. We characterized the flow using high-resolution observations obtained by the Cassini spacecraft in December 2000 (9 months after th…
Scl-dE1 GC1: An Extended Globular Cluster in a Low-Luminosity Dwarf Elliptical Galaxy
Rejkuba, M.; Da Costa, G. S.; Grebel, E. K. +2 more
We report the discovery from Hubble Space Telescope/ACS images of an extended globular cluster, denoted by Scl-dE1 GC1, in the Sculptor Group dwarf Elliptical galaxy Scl-dE1 (Sc22). The distance of the dE is determined as 4.3 ± 0.25 Mpc from the I magnitude of the tip of the red giant branch in the color-magnitude diagram. At this distance the hal…
Multi-frequency imaging of the galaxy cluster Abell 2163 using the Sunyaev-Zel'dovich effect
Kneissl, R.; Menten, K. M.; Ade, P. A. R. +30 more
Context: Observations of the Sunyaev-Zel'dovich effect (SZE) from galaxy clusters are emerging as a powerful tool in cosmology. Besides large cluster surveys, resolved SZE images of individual clusters can shed light on the physics of the intra-cluster medium (ICM) and allow accurate measurements of the cluster gas and total masses.
Aims: We u…
Properties of M31 . I. Dust. Basic properties and a discussion about age-dependent dust heating
Montalto, M.; Seitz, S.; Lee, C. -H. +3 more
Aims: Observations acquired by the Spitzer Space Telescope and improvements to theoretical modeling of dust emission properties are used to discuss the distribution of dust and its characteristics in the closest neighbor spiral galaxy
A spectacular giant arc in the massive cluster lens MACSJ1206.2-0847
Kneib, J. -P.; Jullo, E.; Edge, A. C. +5 more
We discuss the X-ray and optical properties of the massive galaxy cluster MACSJ1206.2-0847 (z = 0.4385), discovered in the Massive Cluster Survey (MACS). Our Chandra observation of the system yields a total X-ray luminosity of 2.4 × 1045ergs-1 (0.1-2.4 keV) and a global gas temperature of 11.6 +/- 0.7keV, very high values typ…
Infrared Luminosities and Dust Properties of z ≈ 2 Dust-obscured Galaxies
Le Floc'h, E.; Dey, Arjun; Bussmann, R. S. +6 more
We present SHARC-II 350 µm imaging of twelve 24 µm bright (F 24 µm > 0.8 mJy) Dust-Obscured Galaxies (DOGs) and Combined Array for Research in Millimeter-wave Astronomy (CARMA) 1 mm imaging of a subset of two DOGs. These objects are selected from the Boötes field of the NOAO Deep Wide-Field Survey. Detections of fou…
Morphology and density structure of post-CME current sheets
Webb, D. F.; Raymond, J. C.; Vršnak, B. +11 more
Context: Eruption of a coronal mass ejection (CME) drags and “opens” the coronal magnetic field, presumably leading to the formation of a large-scale current sheet and field relaxation by magnetic reconnection.
Aims: We analyze the physical characteristics of ray-like coronal features formed in the aftermath of CMEs, to confirm whether interpr…
Does Stellar Feedback Create H I Holes? A Hubble Space Telescope/Very Large Array Study of Holmberg II
Cannon, John M.; Dolphin, Andrew E.; Skillman, Evan D. +4 more
We use deep Hubble Space Telescope (HST)/Advanced Camera for Surveys (ACS) F555W and F814W photometry of resolved stars in the M81 Group dwarf irregular galaxy Ho II to study the hypothesis that the holes identified in the neutral interstellar medium (H I) are created by stellar feedback. From the deep photometry, we construct color-magnitude diag…