Search Publications
CMEs from AR 10365: Morphology and Physical Parameters of the Ejections and of the Associated Current Sheet
Romoli, M.; Poletto, G.; Schettino, G.
We study the evolution and physical parameters of three consecutive coronal mass ejections (CMEs) that occurred at the west limb of the Sun on 2003 June 2 at 00:30, 08:54, 16:08 UT, respectively. The Large Angle and Spectrometric Coronagraph Experiment (LASCO) CME catalog shows that the CMEs entered the C2 field of view with position angles within…
The first gigayear of bulge star formation in Virgo ellipticals: constraints from their globular cluster systems
Spitler, Lee R.
Data products from the Advanced Camera for Surveys Virgo cluster survey are used to understand the bulge star formation history in early-type galaxies at redshifts z >~2. A new technique is developed whereby observed high-redshift age-metallicity relationships are utilized to constrain the typical formation epochs of metal-rich or `bulge' globu…
Supernova remnants, planetary nebulae and the distance to NGC 4214
Mutchler, Max; Windhorst, Rogier; Blair, William P. +23 more
We present narrow band, continuum subtracted Hα, [S II], Hβ, [O III] and [O II] data taken with the Wide Field Camera 3 on the Hubble Space Telescope in the nearby dwarf starburst galaxy NGC 4214. From these images, we identify seventeen new planetary nebula candidates, and seven supernova remnant candidates. We use the observed emission line lumi…
The Optical Depth of White-light Flare Continuum
Fletcher, Lyndsay; Hudson, Hugh; Potts, Hugh +1 more
The white-light continuum emission of a solar flare remains a puzzle as regards its height of formation and its emission mechanism(s). This continuum and its extension into the near-UV contain the bulk of the energy radiated by a flare, and so its explanation is a high priority. We describe a method to determine the optical depth of the emitting l…
Kiloparsec-scale star formation law in M 81 and M 101 based on AKARI far-infrared observations
Nakagawa, T.; Onaka, T.; Shibai, H. +2 more
Aims: We assess the relationships between the surface densities of the gas and star formation rate (SFR) within spiral arms of the nearby late-type spiral galaxies M 81 and M 101. By analyzing these relationships locally, we empirically derive a kiloparsec scale Kennicutt-Schmidt Law (ΣSFR ∝ ΣgasN).
Metho…
Hubble Space Telescope/Near-Infrared Camera and Multi-Object Spectrometer Observations of the GLIMPSE9 Stellar Cluster
Kudritzki, R. P.; Rich, R. Michael; MacKenty, John +4 more
We present Hubble Space Telescope/Near-Infrared Camera and Multi-Object Spectrometer photometry, and low-resolution K-band spectra of the GLIMPSE9 stellar cluster. The newly obtained color-magnitude diagram shows a cluster sequence with H - KS = ~1 mag, indicating an interstellar extinction A _K_s = 1.6 ± 0.2 mag. The spectra of the thr…
A preliminary experience in the use of Chang’E-1 IIM data
Chen, Jun; Wu, Yunzhao; Zheng, Yongchun +7 more
The Interference Imaging Spectrometer (IIM) onboard the first lunar satellite of China, Chang'E-1, has acquired 84% of the area between south and north latitude 70°. To contribute to its usability, this paper presents our preliminary experience in the use of IIM data. Firstly, we provide one practicable method for the on-orbit correction of the in…
Three-dimensional Reconstructions and Mass Determination of the 2008 June 2 LASCO Coronal Mass Ejection Using STELab Interplanetary Scintillation Observations
Jackson, B. V.; Buffington, A.; Hick, P. P. +4 more
We examine and reconstruct the interplanetary coronal mass ejection (ICME) first seen in space-based coronagraph white-light difference images on 2008 June 1 and 2. We use observations of interplanetary scintillation (IPS) taken with the Solar-Terrestrial Environment Laboratory (STELab), Japan, in our three-dimensional (3D) tomographic reconstruct…
A long-lived cyclone in Saturn’s atmosphere: Observations and models
Hueso, R.; Sánchez-Lavega, A.; Pérez-Hoyos, S. +2 more
The atmospheres of the giant planets Jupiter and Saturn possess large numbers of vortices (closed circulation ovals). On the larger scale, above 2000 km, anticyclones on Jupiter and Saturn are generally long-lived coherent structures while cyclones survive a much shorter time and behave more chaotically. A long term survey of images of Saturn's at…
IGR J16328-4726: A New Candidate Supergiant Fast X-ray Transient
Bird, A. J.; Fiocchi, M.; Ubertini, P. +4 more
The unidentified source IGR J16328-4726 was covered with INTEGRAL observations for a long period (~9.8 Ms) and was undetectable for most of the time while showing a very recurrent micro-activity with a duration from tens of minutes to several hours. We report the discovery of two strong outbursts started at 53420.65 MJD and 54859.99 MJD, respectiv…