&lt;title&gt;Architecting the search for terrestrial planets and related origins (ASTRO)&lt;/title&gt;

Miller, David W.; Curtis, Andrew W.; Weck, Olivier L. de; Girerd, André R.; Hacker, Troy L.; Jilla, Cyrus D.; Kong, Edmund; Makins, Brian; Pak, S.

doi:10.1117/12.394033

Cited by 9 publications

(5 citation statements)

References 7 publications

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“…Another solution is to somehow erase the peaks subsequent to the first. This can happen if the microwave background photons encounter a significant optical depth, which requires substantial reionization at quite early times (Miller 2000;Peebles, Seager, & Hu 2000). How this could come about is unclear.…”

Section: Other Solutionsmentioning

confidence: 99%

Boomerang Data Suggest a Purely Baryonic Universe

McGaugh

2000

The Astrophysical Journal

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Section: Other Solutionsmentioning

confidence: 99%

Boomerang Data Suggest a Purely Baryonic Universe

McGaugh

2000

The Astrophysical Journal

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“…Spectroscopy of Cyg X-1 in the various states can greatly enhance the knowledge of the configuration of the mass transfer in the system. Red-shifted absorption lines of highly ionized species have been detected with HETG/Chandra during the low state at orbital phase 0.73 (Schulz et al 2002), 0.84 (Marshall et al 2001) and 0.77 (Miller et al 2002a) and in intermediate states at orbital phase 0.88 (Feng et al 2003 in preparation). These lines show that there is a highly ionized inflow with a variable configuration.…”

Section: Introductionmentioning

confidence: 99%

Probing the Inflow/Outflow and Accretion Disk of Cygnus X‐1 in the High State with theChandraHigh Energy Transmission Grating

Feng¹,

Tennant²,

Zhang³

2003

ApJ

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Cyg X-1 was observed in the high state at the conjunction orbital phase (0) with HETG/Chandra. Strong and asymmetric absorption lines of highly ionized species were detected, such as Fe XXV, Fe XXIV, Fe XXIII, Si XIV, S XVI, Ne X, and etc. In the high state the profile of the absorption lines are composed of an extended red wing and a less extended blue wing. The red wings of higher ionized species are more extended than that of lower ionized species. The detection of these lines provides a way to probe the properties of the flow around the companion and the black hole in Cyg X-1 during the high state.A broad emission feature around 6.5 keV was significantly detected from the both spectra of HETG/Chandra and PCA/RXTE. This feature appears to be symmetric and can be fitted with a Gaussian function rather than the Laor disk line model of fluorescent Fe K α line from an accretion disk. The implications of these results on the structure of the accretion flow of Cyg X-1 in the high state are discussed.

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“…• 100 M < M < 10 5 M : Intermediate Mass Black Holes. A few candidates have been found in the form of ultra-luminous X-ray sources, but they wait for confirmation [20]. Middleweight black holes, thought to be a few hundred to a few thousand times the mass of the Sun, have been hard to pin down.…”

Section: Black Holes As Cosmic Objectsmentioning

confidence: 99%

“…Alternatively, a black hole could form directly during a supernova. Chandra and XMM-Newton observations of iron atoms in the hot gas orbiting 3 stellar black holes and of a handful active galactic nuclei have allowed to investigate the gravitational effects and spin of these black holes [19]. Broad, asymmetric Fe Kα emission lines are found in the spectra of both supermassive black holes and stellar-mass Galactic black holes [23].…”

Section: Stellar Black Holesmentioning

confidence: 99%

Cosmic black holes - from stellar to supramassive black holes in galaxies

Camenzind¹

2006

Ann. Phys.

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The collapse of massive stars produces the most bizarre objects in the Universe. In the last ten years, astronomers have been successfully searching for real black holes in the Universe. Black hole astrophysics began in the 1960s with the discovery of quasars and other active galactic nuclei (AGN) in distant galaxies. Already in the 1960s it became clear that the most natural explanation for the quasar activity is the release of gravitational energy through accretion of gas onto supermassive black holes. The remnants of this activity have now been found in the centers of about 50 nearby galaxies. BH astrophysics received a new twist in the 1970s with the discovery of the X-ray binary Cygnus X-1. The X-ray emitting compact object was too massive to be explained by a neutron star. Today, about 20 excellent BH candidates are known in XRBs. On the extragalactic scale, more than 100,000 quasars have been found in large galaxy surveys. At the redshift of the most distant ones, the Universe was younger than one billion year. The most enigmatic black hole candidates identified in the last years are the compact objects behind the Gamma-Ray Bursters. The formation of all these types of black holes is accompanied by extensive emission of gravitational waves. The detection of these strong gravity events is one of the biggest challenges for physicists in the near future. Milestones in the history of black hole physicsBlack holes are the most bizarre objects in the Universe. Though they are black by definition (their horizon cannot emit any particles), they become visible in astronomical observations when matter is swallowed by the horizon. Due to the deep gravitational potential near the horizon, most of this radiation is emitted in Xand gamma-rays.Einstein and Schwarzschild. Black holes are the simplest objects one can think of within Einstein's theory of gravity. As Chandrasekhar [9] summarized in 1983, we need for their construction only the concepts of space and time. The source of gravity is ultimately a singularity hidden behind the event horizon. No equation of state for any matter is necessary for their understanding. Shortly after Einstein and Hilbert formulated the field equations for the gravitational field, Schwarzschild found already in 1916 the vacuum solution for nonrotating objects. In this solution, a scaling radius appears, known as the Schwarzschild radiuswhich sets the smallest radius for an object of given mass M . Neutron stars have radii bigger than about 2.5 Schwarzschild radii. Extending the Schwarzschild solution towards radii smaller than R S , opens up the branch of the nonrotating black holes with the Schwarzschild radius as the dimension of the horizon of the black hole. The surface r = R S defines a horizon from which no form of matter can escape to infinity.

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<title>Architecting the search for terrestrial planets and related origins (ASTRO)</title>

Cited by 9 publications

References 7 publications

Boomerang Data Suggest a Purely Baryonic Universe

Boomerang Data Suggest a Purely Baryonic Universe

Probing the Inflow/Outflow and Accretion Disk of Cygnus X‐1 in the High State with theChandraHigh Energy Transmission Grating

Cosmic black holes - from stellar to supramassive black holes in galaxies

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