We examine the vertical structure and equilibrium of the molecular gas layer in the galactic disk, measuring its scale height and velocity dispersion as a function of Galactic radius by modeling the CO emission at the tangent points. The model takes into account emission from a large path length along the line of sight, corresponding to an interval (∆R) of typically a few hundred parsecs in gal...

The Chandra X-ray Observatory is the X-ray component of NASA's Great Observatory Program and has been operating successfully for over five years. We present here brief overview of the technical performance and some of the remarkable discoveries. Placement in its highly elliptical orbit was completed 15 days after launch. The orbit has a nominal apogee of 140,000 km and a nominal perigee of 10,0...

A numerical trajectory optimization study of two types of lifting-entry reentry vehicle has been presented at low suborbital speed of 4.113 km/s and -15 degree entry angle. These orbital speeds are typical of medium range ballistic missile with ballistic range of approximately 2000 km at optimum burnout angle of approximately 41 degree for maximum ballistic range. A lifting reentry greatly enha...

Abstract We present the first joint NuSTAR and NICER observations of ultracompact X-ray binary (UCXB) 4U 1543?624 obtained in 2020 April. The source was at a luminosity L 0.5?50 keV = 4.9( D /7 kpc) 2 × 10 36 erg s ?1 showed evidence reflected emission form an O viii line, Fe K Compton hump within spectrum. used full reflection model, known as xillverCO , that is tailored for atypical abundance...

The paper presents an analysis of energy consumption in a Plug-in Hybrid Electric Vehicle (PHEV) used actual road conditions. Therefore, the features comparison obtained from fuel and taken vehicle’s batteries for each travel with total distance 5000 km. instantaneous per travelling kilometre operating conditions combustion engine mode are within range 233 to 1170 Wh/km electric motor 135 420 W...

ABSTRACT We investigate the properties of stars participating in double compact star merger events considering interacting model stable strange quark matter. matter making it compatible with recent astrophysical observations mass–radius and gravitational wave events. In this context, we consider modified MIT bag vector without self-interaction. find new upper bound on tidal deformability $1.4\,...

At 16:16 local time (14:16 GMT) January 8, 2013 a moderate size earthquake ML5.8 (Mw5.7) occurred 40 km SE off the coasts of Limnos island, Northern Aegean, Greece. The epicenter coordinates were calculated to 39.636N 25.576E and the focal depth to 32.3 km (MT centroid depth 8 km) according to the Institute of Geodynamics, National Observatory of Athens (NOAIG). The earthquake was felt at a wid...

Context. The discovery of photospheric absorption lines in XMM-Newton spectra of the X-ray bursting neutron star in EXO 0748−676 by Cottam and collaborators allows us to constrain the neutron star mass-radius ratio from the measured gravitational redshift. A radius of R = 9 − 12 km for a plausible mass range of M = 1.4 − 1.8 M⊙ was derived by these authors. Aims. It has been claimed that the ab...