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Rosat x-ray observations of central galactic starbursts
GALAXIES x-ray observations central galactic starbursts
2009/6/4
We present spatial and spectral results of ROSAT observations of two galax-ies: NGC 4569 and NGC 4303. Both objects are members of the Virgo Cluster andhave nearby smaller companions with which they h...
Thermal structure and radiation spectra of photoionized gas in accretion-powered x-ray sources
photoionized gas RADIATION MECHANISMS x-ray sources
2009/6/4
The X-ray irradiated gas around a compact object was investigated. Wesolved the hydrostatic balance coupling with the ionization and thermal balancesto obtain the structure of the optically thin emiss...
Spectra from ASCA have provided the most detailed view to date of theX-ray spectral properties of stellar winds in massive X-ray binaries. Using de-tailed atomic mo dels that account for recombinat...
With the launch of the Chandra X-ray Observatory, high resolution X-rayspectroscopy of cosmic sources has begun. Early, deep observations of three stellarcoronal sources桟apella, Pro cyon, and HR 1099梐...
Hot gas and the gaseous structure of the galaxy
HYDRODYNAMICS SUPERNOVAREMNANTS X-RAYS GALAXIES
2009/6/4
A parochial review is presented concerning the status of our understandingof hot gas regions in the Galaxy and their implications for the overall distributionsof the Galaxy抯 gaseous components. We hav...
Needs and requirements for future x-ray observations of hot galactic halos
HALOS X-RAYS JETS AND OUTFLOWS
2009/6/4
Galaxies are key objects for the study of cosmology, the life cycle of matter,and stellar evolution. X-ray observations have given us a new key window intothese building blocks of the Universe, that a...
Major advances have been made in the past decade in our knowledge of the hotinterstellar gas of our Milky Way galaxy. The Di.use X-ray Spectrometer obtainedspectra in the 0.15?.28 keV range from the G...
Ultraviolet emission line ratios have long provided powerful diagnostics for thedensity, temperature, elemental abundances and ionization state of astrophysicalplasmas. With the current generation of ...
Hard X-ray Spectrum of Mkn 421 during the Active Phase
X-rays BL Lac sources massive black hole candidates jet emission individual—Mkn 421
2009/5/20
Spectral measurement of Mkn 421 were made in the hard Xray
energy band of 20–200 keV using a high sensitivity, large area scintillation
counter telescope on November 21, 2000 and these coincided wit...
Soft X-ray Variability of the Bright Quasar 3C273
individual (3C273) quasar—X-rays galaxies
2009/5/20
We present the results from ROSAT observations of 3C273
in the soft X-ray band. The light variation of 3C273 was investigated for
three different energy bands of soft, medium, and hard. The maximum
...
Several new features of X-ray binary pulsars are revealed
from recent observations with ASCA, RXTE, BeppoSAX and other Xray
observatories. Among these, I will review in this paper some recent
progr...
Photometric Variability of Four Coronally Active Stars
Stars variable optical photometry X-rays source
2009/5/19
We present photometric observations of four stars that are
optical counterparts of soft X-ray/EUV sources, namely 1ES 0829+15.9,
1ES0920-13.6, 2RE J110159+223509 and 1ES 1737+61.2. We have discovere...
Spectral Variability in Hard X-rays and the Evidence for a 13.5 Years Period in the Bright Quasar 3C273
Galaxies individual 3C273—X-rays
2009/5/19
We report the observation of nearest quasar 3C273 made
with LASE instrument on November 20th, 1998 as a part of our continuing
programme of balloon borne hard X-ray observations in the 20–200 keV
b...
Fast Transition between High-soft and Low-soft States in GRS 1915 C 105：Evidence for a Critically Viscous Accretion Flow
accretion discs binaries black hole X-rays
2009/5/19
We present the results of a detailed analysis of RXTE observations
of class ! (Klein-Wolt et al. 2002) which show an unusual state
transition between high-soft and low-soft states in the Galactic mi...
Spectral Measurements of Cyg X-3: A Thermal Source Embedded in Hot Plasma within a Cold Shell
Low mass X-ray binaries X-ray sources Cyg X-3
2009/5/19
The attempts at unified model fitting to explain the spectral
variations in Cyg X-3 suggest equally probable fits with a combination of
an absorbed blackbody and a separately absorbed power law with...