Search Publications
Missions
Journals
Publication Years
On a Surge: Properties of an Emerging Flux Region
Liu, Yu; Kurokawa, Hiroki
A surge event with multi-instrument and multiwavelength observations is presented. The event occurred in a surge-productive region on 2001 August 30. TRACE white-light images, Huairou vector magnetograms, and Hβ filtergrams show that this surge was closely associated with new bipoles that emerged in 1 hr. Evidence of enhanced magnetic cancellation…
The Deep Lens Survey Transient Search. I. Short Timescale and Astrometric Variability
Becker, A. C.; Frail, D. A.; Halpern, J. +8 more
We report on the methodology and first results from the Deep Lens Survey (DLS) transient search. We utilize image subtraction on survey data to yield all sources of optical variability down to 24th magnitude. Images are analyzed immediately after acquisition, at the telescope, and in near-real time, to allow for follow-up in the case of time-criti…
Morphologies and Spectral Energy Distributions of Extremely Red Galaxies in the GOODS-South Field
Papovich, Casey; Ferguson, Henry C.; Giavalisco, Mauro +12 more
Using U'- through Ks-band imaging data in the Great Observatories Origins Deep Survey-South (GOODS-South) field, we construct a large, complete sample of 275 extremely red objects (EROs; Ks<22.0, R-Ks>3.35 AB), all with deep Hubble Space Telescope Advanced Camera for Surveys imaging in B435
On the origin of the C IV Baldwin effect in active galactic nuclei
Laor, Ari; Baskin, Alexei
The origin of the luminosity dependence of the equivalent width (EW) of broad emission lines in active galactic nuclei (AGN) - the Baldwin effect - is not firmly established yet. We explore this question for the broad C IVλ1549 line using the Boroson & Green sample of the 87 z<= 0.5 Bright Quasar Survey (BQS) quasars. Useful UV spectra of t…
Cold Dust in Early-Type Galaxies. I. Observations
Brighenti, Fabrizio; Mathews, William G.; Bregman, Jesse D. +1 more
We describe far-infrared observations of early-type galaxies selected from the Infrared Space Observatory (ISO) archive. This rather inhomogeneous sample includes 39 giant elliptical galaxies and 14 S0 (or later) galaxies. These galaxies were observed with the array photometer PHOT on-board the ISO satellite using a variety of different observing …
Puzzling wind properties of young massive stars in SMC-N81
Schaerer, D.; Martins, F.; Hillier, D. J. +1 more
We present a quantitative study of massive stars in the High Excitation Blob N81, a compact star forming region in the SMC. The stellar content was resolved by HST, and STIS was used to obtain medium resolution spectra. The qualitative analysis of the stellar properties presented in Heydari-Malayeri et al. (\cite{papI}) is extended using non-LTE s…
The Discovery of an Anomalous Subgiant Branch in the Color-Magnitude Diagram of ω Centauri
Ferraro, Francesco R.; Origlia, Livia; Cool, Adrienne M. +4 more
Using deep high-resolution multiband images taken with the Very Large Telescope and the Hubble Space Telescope, we discovered a new anomalous sequence in the color-magnitude diagram of ω Cen. This feature appears as a narrow well-defined subgiant branch (SGB-a), which merges into the main sequence of the dominant cluster population at a magnitude …
Organized Subsurface Flows near Active Regions
Thompson, M. J.; Toomre, J.; Hindman, B. W. +1 more
Local helioseismic techniques, such as ring analysis and time-distance helioseismology, have already shown that large-scale flows near the surface converge towards major active regions. Ring analysis has further demonstrated that at greater depths some active regions exhibit strong outflows. A critique leveled at the ring-analysis results is that …
Star cluster formation and evolution in the dwarf starburst galaxy NGC 1569
de Grijs, R.; Anders, P.; Fritze-v. Alvensleben, U. +1 more
We analyse multiwavelength Hubble Space Telescope (HST) observations of a large number of star clusters in the nearby (post-)starburst dwarf galaxy NGC 1569. Their spectral energy distributions (SEDs) cover at least the wavelength range from U to I in equivalent HST filters, in most cases supplemented by near-infrared data. Using our most up-to-da…
Characteristics of active-region sources of solar wind near solar maximum
Neugebauer, M.; Liewer, Paulett C.; Zurbuchen, Thomas
Previous studies of the source regions of solar wind sampled by ACE and Ulysses showed that some solar wind originates from open magnetic flux rooted in active regions. These solar wind sources were labeled active-region sources when the open flux was from a strong field region with no corresponding coronal hole in the NSO He 10830 Å synoptic coro…