Search Publications
Speckle interferometry of nearby multiple stars. V. 2002–2006 positional measurements
Dyachenko, V. V.; Rastegaev, D. A.; Balega, Yu. Yu. +5 more
We present the measurements of positional parameters of 194 nearby binary stars performed at the 6-m BTA telescope of the SAO RAS from 2002 through 2006 applying the speckle interferometric technique. The observations were conducted at central filter wavelengths ranging from 545 to 800 nm using a speckle interferometer equipped with a fast CCD and…
Solar TErrestrial Relations Observatory-A (STEREO-A) and PRoject for On-Board Autonomy 2 (PROBA2) Quadrature Observations of Reflections of Three EUV Waves from a Coronal Hole
Berghmans, D.; Seaton, D. B.; Temmer, M. +5 more
We investigate the interaction of three consecutive large-scale coronal waves with a polar coronal hole, simultaneously observed on-disk by the Solar TErrestrial Relations Observatory (STEREO)-A spacecraft and on the limb by the PRoject for On-Board Autonomy 2 (PROBA2) spacecraft on 27 January 2011. All three extreme ultraviolet (EUV) waves origin…
The Abundance of H2O and HDO in Orion Kl from Herschel/HIFI
Bergin, Edwin A.; Melnick, Gary J.; Neill, Justin L. +4 more
Using a broadband, high spectral resolution survey toward the Orion Kleinmann-Low nebula acquired with Herschel/HIFI as part of the Herschel Observations of Extra-Ordinary Sources key program, we derive the abundances of H2O and HDO in the different spatial/velocity components associated with this massive star-forming region: the Hot Co…
GRO J1008-57: an (almost) predictable transient X-ray binary
Klochkov, D.; Wilms, J.; Ferrigno, C. +13 more
A study of archival RXTE, Swift, and Suzaku pointed observations of the transient high-mass X-ray binary GRO J1008-57 is presented. A new orbital ephemeris based on pulse arrival-timing shows the times of maximum luminosities during outbursts of GRO J1008-57 to be close to periastron at orbital phase - 0.03. This makes the source one of a few for …
Young stellar population and ongoing star formation in the H II complex Sh2-252
Jose, Jessy; Samal, M. R.; Ojha, D. K. +7 more
In this paper, an extensive survey of the star-forming complex Sh2-252 has been undertaken with an aim to explore its hidden young stellar population as well as to understand the structure and star formation history for the first time. This complex is composed of five prominent embedded clusters associated with the subregions A, C, E, NGC 2175s an…
The Accretion Disk and Ionized Absorber of the 9.7 hr Dipping Black Hole Binary MAXI J1305-704
Mihara, T.; Sugizaki, M.; Yamaoka, K. +14 more
We report the results from X-ray studies of the newly discovered black hole candidate MAXI J1305-704 based on Suzaku and Swift observations in the low/hard and high/soft states, respectively. The long Suzaku observation shows two types of clear absorption dips, both of which recur on a dip interval of 9.74 ± 0.04 hr, which we identify with the orb…
Weak Lensing Calibrated M-T Scaling Relation of Galaxy Groups in the COSMOS Fieldsstarf
Finoguenov, A.; Ilbert, O.; Tanaka, M. +9 more
The scaling between X-ray observables and mass for galaxy clusters and groups is instrumental for cluster-based cosmology and an important probe for the thermodynamics of the intracluster gas. We calibrate a scaling relation between the weak lensing mass and X-ray spectroscopic temperature for 10 galaxy groups in the COSMOS field, combined with 55…
Kinetic Modeling of Particle Acceleration in a Solar Null-point Reconnection Region
Haugbølle, T.; Nordlund, Å.; Baumann, G.
The primary focus of this paper is on the particle acceleration mechanism in solar coronal three-dimensional reconnection null-point regions. Starting from a potential field extrapolation of a Solar and Heliospheric Observatory (SOHO) magnetogram taken on 2002 November 16, we first performed magnetohydrodynamics (MHD) simulations with horizontal m…
Heliospheric Imaging of 3D Density Structures During the Multiple Coronal Mass Ejections of Late July to Early August 2010
Liu, Y.; Webb, D. F.; Möstl, C. +16 more
It is usually difficult to gain a consistent global understanding of a coronal mass ejection (CME) eruption and its propagation when only near-Sun imagery and the local measurements derived from single-spacecraft observations are available. Three-dimensional (3D) density reconstructions based on heliospheric imaging allow us to "fill in" the tempo…
HST/COS Spectra of Three QSOs That Probe the Circumgalactic Medium of a Single Spiral Galaxy: Evidence for Gas Recycling and Outflow
Savage, Blair D.; Shull, J. Michael; Danforth, Charles W. +5 more
We have used the Cosmic Origins Spectrograph (COS) to obtain far-UV spectra of three closely spaced QSO sight lines that probe the circumgalactic medium (CGM) of an edge-on spiral galaxy, ESO 157-49, at impact parameters of 74 and 93 h -1 70 kpc near its major axis and 172 h -1 70 kpc along its minor axi…