Search Publications
3-dimensional kinematics in low foreground extinction windows of the Galactic bulge. Radial velocities for six bulge fields: procedures and results
Rich, R. M.; Soto, M.; Kuijken, K.
Aims: The detailed structure of the Galactic bulge still remains uncertain. The strong difficulties of obtaining observations of stars in the Galactic bulge have hindered the acquisition of a kinematic representation for the inner kpc of the Milky Way. The observation of the 3-d kinematics in several low foreground extinction windows can solv…
The X-ray luminous galaxies optically classified as star forming are mostly narrow line Seyfert 1 s
Ballo, L.; Barcons, X.; Carrera, F. J. +3 more
Context. The optical and ultraviolet emission lines of galaxies are widely used to distinguish star-forming (SF) galaxies from active galactic nuclei (AGNs). However, this type of diagnostic has some associated uncertainties, because AGNs can be of low luminosity and/or heavily obscured, and the optical emission lines may be dominated by a stellar…
Characterization of the X-Ray Light Curve of the γ Cas-like B1e Star HD 110432
Smith, Myron A.; Motch, Christian; Lopes de Oliveira, Raimundo
HD 110432 (BZ Cru B1Ve) is the brightest member of a small group of "γ Cas analogs" that emit copious hard X-ray flux, punctuated by ubiquitous "flares." To characterize the X-ray time history of this star, we made a series of six RXTE multi-visit observations in 2010 and an extended observation with the XMM-Newton in 2007. We analyzed these new l…
XMMU J0541.8-6659, a new supernova remnant in the Large Magellanic Cloud
Pietsch, W.; Haberl, F.; Smith, R. C. +6 more
Context. The high sensitivity of the XMM-Newton instrumentation offers the opportunity to study faint and extended sources in the Milky Way and nearby galaxies such as the Large Magellanic Cloud (LMC) in detail. The ROSAT PSPC survey of the LMC has revealed more than 700 X-ray sources, among which there are 46 supernova remnants (SNRs) and candida…
Identification of Galactic Bulge Survey X-Ray Sources with Tycho-2 Stars
Maccarone, T. J.; Torres, M. A. P.; Nelemans, G. +6 more
We identify 69 X-ray sources discovered by the Galactic Bulge Survey (GBS) that are coincident with or very close to bright stars in the Tycho-2 catalog. Additionally, two other GBS sources are resolved binary companions to Tycho-2 stars where both components are separately detected in X-rays. Most of these are likely to be real matches, but we id…
Separating the BL Lac and cluster X-ray emissions in Abell 689 with Chandra
Birkinshaw, M.; Worrall, D. M.; Maughan, B. J. +2 more
We present the results of a Chandra observation of the galaxy cluster Abell 689 (z = 0.279). Abell 689 is one of the most luminous clusters detected in the ROSAT All Sky Survey (RASS), but was flagged as possibly including significant point source contamination. The small point spread function of the Chandra telescope allows us to confirm this and…
The Mass-Richness Relation of MaxBCG Clusters from Quasar Lensing Magnification Using Variability
Baltay, Charles; Rabinowitz, David; Bauer, Anne H. +3 more
Accurate measurement of galaxy cluster masses is an essential component not only in studies of cluster physics but also for probes of cosmology. However, different mass measurement techniques frequently yield discrepant results. The Sloan Digital Sky Survey MaxBCG catalog's mass-richness relation has previously been constrained using weak lensing …
RW Aur A from the X-Wind Point of View: General Features
Liu, Chun-Fan; Shang, Hsien
In this paper, the RW Aur A microjet is studied from the point of view of X-wind models. The archived Hubble Space Telescope/STIS spectra of the optical forbidden lines [O I], [S II], and [N II] from RW Aur A, taken in Cycle 8 with seven parallel slits along the jet axis, spaced at 0farcs07 apart, were analyzed. Images, position-velocity diagrams,…
Disturbed Zone and Piston Shock Ahead of Coronal Mass Ejection
Eselevich, M.; Eselevich, V.
The 2010 June 13 coronal mass ejection (CME) propagating toward the position angle P.A. ≈ 245° (measured counterclockwise from the Sun's north pole) was studied from the SDO/AIA and SOHO/LASCO C2, C3 data. We show that ahead of the CME frontal structure, as a result of its interaction with the undisturbed solar wind, a disturbed region (with an in…
Three-dimensional Structure and Evolution of Extreme-ultraviolet Bright Points Observed by STEREO/SECCHI/EUVI
Moon, Yong-Jae; Chae, Jongchul; Zhang, Jie +4 more
We unveil the three-dimensional structure of quiet-Sun EUV bright points and their temporal evolution by applying a triangulation method to time series of images taken by SECCHI/EUVI on board the STEREO twin spacecraft. For this study we examine the heights and lengths as the components of the three-dimensional structure of EUV bright points and t…