We present Hubble Space Telescope images of the Heiii region surrounding the bright X-ray source in the dwarf irregular galaxy Holmberg II. Using Chandra, we find a position for the X-ray source of α = 08h 19m 28.98s, δ = +70 • 42 ′ 19. ′′ 3 (J2000) with an uncertainty of 0.6 ′′. We identify a bright, point-like optical counterpart centered in the nebula with the X-ray source. The optical magni...

The steep spectrum radio source VLSSJ2217.5+5943 shows a complex, filamentary morphology and curved spectrum. Therefore, the has previously been classified as phoenix. However, no galaxy cluster associated with this confidently detected so far because is located in direction of innermost zone Galactic Plane at b = +2.4 degr (innermost Zone Avoidance, ZoA). We analysed archival observations near...

Abstract. Soil water is a major requirement for biomass production and, therefore, one of the most important factors agriculture productivity. As agricultural droughts are related to declining soil moisture, this paper examines moisture drought in transboundary Koshi River basin (KRB) central Himalayan region. By applying J2000 hydrological model, daily spatially distributed derived entire over...

A Chandra image of the central X-ray source RX J0007.0+7303 in the supernova remnant CTA 1 reveals a point source, a compact nebula, and a bent jet, all of which are characteristic of energetic, rotation-powered pulsars. Using the MDM 2.4m telescope we obtain upper limits in the optical at the position of the point source, (J2000) 00 h 07 m 01. these correspond to an X-ray-to-optical flux ratio...

The LSPM-north catalog is a comprehensive list of 61,977 stars north of the J2000 celestial equator that have proper motions larger than 0.15 seconds of arc per year (local-background-stars frame). The catalog has been generated primarily as a result of our systematic search for high proper motion stars in the Digitized Sky Surveys using our SUPERBLINK software. At brighter magnitudes, the cata...

The Hungarian-made Automated Telescope Network (HATnet) is an ongoing project to detect transiting extrasolar planets using small-aperture (11 cm diameter) robotic telescopes. In this paper, we present the results from using image subtraction photometry to reduce a crowded stellar field observed with one of the HATnet telescopes (HAT-5). This field was chosen to overlap with the planned Kepler ...

We have conducted a deep, very long baseline interferometry (VLBI) observation at 1.4 GHz of an area of sky located within the NOAO Boötes field, using the NRAO Very Long Baseline Array and 100-m Green Bank Telescope. Applying wide-field VLBI techniques, a total of 61 sources, selected from a Westerbork Synthesis Radio Telescope (WSRT) image, were surveyed simultaneously with a range of differe...

We present an objective and automated procedure for detecting clusters of galaxies in imaging galaxy surveys. Our Voronoi Galaxy Cluster Finder (VGCF) uses galaxy positions and magnitudes to find clusters and determine their main features: size, richness and contrast above the background. The VGCF uses the Voronoi tessellation to evaluate the local density and to identify clusters as significat...

GRO J2058+42, a transient 198 second x-ray pulsar, was discovered by the Burst and Transient Source Experiment (BATSE) on the Compton Gamma-Ray Observatory (CGRO), during a “giant” outburst in 1995 September-October. The total flux peaked at about 300 mCrab (20-50 keV) as measured by Earth occultation. The pulse period decreased from 198 s to 196 s during the 46-day outburst. The pulse shape ev...