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Chandra X-Ray Observatory (CXO):Overview
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The Chandra X-Ray Observatory (CXO), the x-ray component of NASA's Great Observatories, was launched early in the morning of 1999, July 23 by the Space Shuttle Columbia. The Shuttle launch was only the first step in placing the observatory in orbit. After release from the cargo bay, the Inertial Upper Stage performed two firings, and separated from the observatory as planned. Finally, after five firings of Chandra's own Integral Propulsion System--- the last of which took place 15 days after launch--- the observatory was placed in its highly elliptical orbit of 140,000 km apogee and 10,000 km perigee. After activation, the first x-rays focussed by the telescope were observed on 1999, August 12. Beginning with these initial observations one could see that the telescope had survived the launch environment and was operating as expected. The month following the opening of the sunshade door was spent adjusting the focus for each set of instrument configurations, determining the optical axis, calibrating the star camera, establishing the relative response functions, determining energy scales, and taking a series of "publicity" images. Each observation proved to be far more revealing than was expected. Finally, and despite an initial surprise and setback due to the discovery that the Chandra x-ray telescope was far more efficient for concentrating low-energy protons than had been anticipated, the observatory is performing well and is returning superb scientific data. Together with other space observatories, most notably the recently activated XMM-Newton, it is clear that we are entering a new era of discovery in high-energy astrophysics.
Forward citations
Cited by 11 Pith papers
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Spatially resolved optical and mid-infrared spectroscopy of SDSS1335+0728: implications for the origin of the Ansky event
Spatially resolved spectroscopy shows SDSS1335+0728 has a three-zone ionisation structure, optically thin dust, and sustained low-level nuclear activity for at least 1500 years, implying the Ansky event is a faint tra...
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Outflows in super-Eddington quasars drive clumpy circumgalactic medium and extended H$\alpha$ nebulae at $z \gtrsim 6$
In z≈6 quasar simulations, super-Eddington black-hole growth clears escape channels, ejects cold clumps that raise neutral-hydrogen covering, and powers extended Hα nebulae that shrink when the quasar is obscured.
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LoVoCCS. III. Third Generation Pipeline & The Hercules Supercluster
A new LSST-pipeline-based reduction and multi-plane weak-lensing analysis measures the Hercules supercluster at 8.9 x 10^14 solar masses and attributes Abell 2147's inflated dynamical mass to a recent pericenter passage.
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Analysis of Forbidden Neon Emission lines in HAeBe Stars using Spitzer IRS spectra
Neon lines detected in 25 Herbig Ae/Be stars indicate EUV radiation, not X-rays, is the main ionizing source.
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Blind Line Search System: BLiSS
BLiSS blindly detects, ranks, and optionally identifies emission-line candidates in 1D X-ray spectra via empirical baselines, Gaussian fits, and GMM reliability scores from synthetic null spectra.
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New constraints on cosmic anisotropy from galaxy clusters using an improved dipole fitting method
Galaxy cluster observations yield two preferred directions with cosmic anisotropy amplitude of about 5.3 times 10 to the minus 4 at roughly 1 sigma overall significance, though higher in the XMM-Newton subsample.
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Reflection-dominated Compton-thick AGN Candidates in the SRG/eROSITA Lockman Hole Survey
A catalogue of 291 hard X-ray sources in the Lockman Hole, interpreted as candidate reflection-dominated Compton-thick AGN, with density estimates and a consistency check against a one-megasecond XMM-Newton spectrum.
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Transient and Variable Ultra-luminous X-ray Sources in NGC 4552
Archival Chandra and XMM-Newton observations reveal two transient X-ray sources in NGC 4552 exceeding 10^39 erg/s, classifying them as new transient ULXs.
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X-rays Mark the Spot: The Effects of Reduced Metallicity on X-ray AGN Obscuration at High Redshift
Lower metallicity in high-redshift tori raises the X-ray escape fraction from Compton-thick obscurers, improving prospects for detecting z~10 AGNs.
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Blazars Jets and prospects for TeV-PeV neutrinos & gamma-rays through cosmic-ray interactions
A single-zone model with added proton-proton collisions suggests W Comae and 1ES 1959+650 need hadronic emission, and CTAO sensitivity forecasts show all four BL Lacs are detectable.
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Accreting stellar-mass black holes
A synthesis of multi-wavelength observations and models of variability, jets, and polarization in stellar-mass black hole accretion systems.
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