Search Publications
Pre-main-sequence Stellar Populations across Shapley Constellation III. I. Photometric Analysis and Identification
Henning, Thomas; Da Rio, Nicola; Gouliermis, Dimitrios A. +11 more
We present our investigation of pre-main-sequence (PMS) stellar populations in the Large Magellanic Cloud (LMC) from imaging with Hubble Space Telescope Wide-Field Planetary Camera 2. Our targets of interest are four star-forming regions located at the periphery of the super-giant shell LMC 4 (Shapley Constellation III). The PMS stellar content of…
Reinstating the M31 X-Ray System RX J0042.3+4115 as a Black Hole X-Ray Binary and Compelling Evidence for an Extended Corona
Murray, S. S.; Garcia, M. R.; Barnard, R.
The M31 X-ray source RX J0042.3+4115 was originally identified as a black hole (BH) binary because it displayed characteristic low-state variability at conspicuously high luminosities; unfortunately, this variability was later found to be artificial. However, analysis of 84 Chandra ACIS observations, a Hubble Space Telescope Advanced Camera for Su…
Two Types of Extreme-ultraviolet Brightenings In AR 10926 Observed by Hinode/EIS
Moon, Y. -J.; Choe, G. S.; Kim, Sujin +3 more
We have investigated seven extreme-ultraviolet (EUV) brightenings in the active region AR 10926 on 2006 December 2 observed by the EUV Imaging Spectrometer on board the Hinode spacecraft. We have determined their Doppler velocities and non-thermal velocities from 15 EUV spectral lines (log T = 4.7 - 6.4) by fitting each line profile to a Gaussian …
On the Anti-correlation between Spectral Line Broadening and Intensity in Coronal Structures Observed with EIS
Martens, P. C. H.; Scott, J. T.
The advance in spectral resolution of the Extreme Ultraviolet Imaging (EIS) spectrometer on board Hinode has allowed for more detailed analysis of coronal spectral lines. Large line broadening and blueshifted velocities have been found in the periphery of active region (AR) cores and near the footpoints of coronal loops. This line broadening is ye…
Vector Magnetic Fields and Current Helicities in Coronal Holes and Quiet Regions
Li, Ting; Yang, Shuhong; Zhang, Jun +1 more
In the solar photosphere, many properties of coronal holes (CHs) are not known, especially vector magnetic fields. Using observations from Hinode, we investigate vector magnetic fields, current densities, and current helicities in two CHs, and compare them with two normal quiet regions (QRs) for the first time. We find that the areas where large c…
Dynamically Excited Outer Solar System Objects in the Hubble Space Telescope Archive
Fuentes, Cesar I.; Holman, Matthew J.; Trilling, David E.
We present the faintest mid-ecliptic latitude survey in the second part of Hubble Space Telescope archival search for outer solar system bodies. We report the discovery of 28 new trans-Neptunian objects and one small centaur (R ~ 2 km) in the band 5°-20° off the ecliptic. The inclination distribution of these excited objects is consistent with the…
The Nature of Star Formation at 24 µm in the Group Environment at 0.3 <~ z <~ 0.55
Parker, L. C.; Wilman, D. J.; Mulchaey, J. S. +7 more
Galaxy star formation rates (SFRs) are sensitive to the local environment; for example, the high-density regions at the cores of dense clusters are known to suppress star formation. It has been suggested that galaxy transformation occurs largely in groups, which are the intermediate step in density between field and cluster environments. In this p…
The Hot Components of AM CVn Helium Cataclysmics
Sion, Edward M.; Godon, Patrick; Linnell, Albert P. +1 more
We present the results of a multi-component synthetic spectral analysis of the archival far-ultraviolet spectra of the hot components of several AM CVn double degenerate interacting binaries with known distances from trigonometric parallaxes. Our analysis was carried out using the code BINSYN, which takes into account the donor companion star, the…
Properties and Expected Number Counts of Active Galactic Nuclei and Their Hosts in the Far-infrared
Ballantyne, D. R.; Draper, A. R.
Telescopes like Herschel and the Atacama Large Millimeter/submillimeter Array (ALMA) are creating new opportunities to study sources in the far-infrared (FIR), a wavelength region dominated by cold dust emission. Probing cold dust in active galaxies allows for study of the star formation history of active galactic nucleus (AGN) hosts. The FIR is a…
Line Shape Effects on Intensity Measurements of Solar Features: Brightness Correction to SOHO MDI Continuum Images
Ermolli, I.; Del Moro, D.; Tritschler, A. +4 more
Continuum intensity observations obtained with the Michelson Doppler Imager (MDI) on board the SOHO mission provide long time series of filtergrams that are ideal for studying the evolution of large-scale phenomena in the solar atmosphere and their dependence on solar activity. These filtergrams, however, are not taken in a pure continuum spectral…