Prostaglandin D Synthase in Human Semen

Arnett, William P; Zini, Armand; Jarvi, Keith; Diamandis, Eleftherios P.

doi:10.1097/00005392-199904020-00123

Cited by 6 publications

(6 citation statements)

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“…An attractive feature of using SN Ia as distance indicators at significant redshifts is the possibility of minimizing the evolutionary effects which plague distance indicators based on the properties of galaxies. Initial models proposed that SN Ia arise from the explosions of carbon-oxygen white dwarfs as they reach the Chandrasekhar mass (Hoyle & Fowler 1960;Arnett 1969;Colgate & McKee 1969). This mechanism for SN Ia explosions leads to a burning front which propagates outwards from the white dwarf's center, burning nearly the entire star to nuclear statistical equilibrium.…”

Section: Evolutionmentioning

confidence: 99%

The High‐Z Supernova Search: Measuring Cosmic Deceleration and Global Curvature of the Universe Using Type Ia Supernovae

Schmidt

Suntzeff

Phillips

et al. 1998

ApJ

1,319

695

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The High-Z Supernova Search is an international collaboration to discover and monitor type Ia supernovae (SN Ia) at z > 0.2 with the aim of measuring cosmic deceleration and global curvature. Our collaboration has pursued a basic understanding of supernovae in the nearby Universe, discovering and observing a large sample of objects, and developing methods to measure accurate distances with SN Ia. This paper describes the extension of this program to z ≥ 0.2, outlining our search techniques and follow-up program. We have devised high-throughput filters which provide accurate two-color restframe B and V light curves of SN Ia, enabling us to produce precise, extinction-corrected luminosity distances in the range 0.25 < z < 0.55. Sources of systematic error from K-corrections, extinction, selection effects, and evolution are investigated, and their effects estimated. We present photometric and spectral observations of SN 1995K, our program's first supernova, and use the data to obtain a precise measurement of the luminosity distance to the z = 0.479 host galaxy. This object, when combined with a nearby sample of SN, yields an estimate for the matter density of the Universe of Ω M = −0.2 +1.0 −0.8 if Ω Λ = 0. For a spatially flat universe composed of normal matter and a cosmological constant, we find Ω M = 0.4 +0.5 −0.4 , Ω Λ = 0.6 +0.4 −0.5. We demonstrate that with a sample of ∼ 30 objects, we should be able to determine relative luminosity distances over the range 0 < z < 0.5 with sufficient precision to measure Ω M with an uncertainty of ±0.2.

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Section: Evolutionmentioning

confidence: 99%

The High‐Z Supernova Search: Measuring Cosmic Deceleration and Global Curvature of the Universe Using Type Ia Supernovae

Schmidt

Suntzeff

Phillips

et al. 1998

ApJ

1,319

695

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“…Weaver, & Taam 1980). Within the M Ch WD and the merging scenarios, the description of the propagation of the burning front further divides the models into several groups such as deflagration (Nomoto, Thielemann, & Yokoi 1984), detonation (Arnett 1969), delayed detonation (DD; Khokhlov 1991a), pulsating delayed detonation (PDD; Khokhlov 1991b), and late detonation (Yamaoka et al 1992).…”

Section: Theoretical Models For Sn 2002cxmentioning

confidence: 99%

SN 2002cx: The Most Peculiar Known Type Ia Supernova

Li¹,

Filippenko²,

Chornock³

et al. 2003

PUBL ASTRON SOC PAC

327

212

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We present photometric and spectroscopic observations of supernova (SN) 2002cx, which reveal it to be unique among all observed type Ia supernovae (SNe Ia). SN 2002cx exhibits a SN 1991T-like premaximum spectrum, a SN 1991bg-like luminosity, and expansion velocities roughly half those of normal SNe Ia. Photometrically, SN 2002cx has a broad peak in the $R$ band and a plateau phase in the $I$ band, and slow late-time decline. The $(B - V)$ color evolution is nearly normal, but the $(V - R)$ and $(V - I)$ colors are very red. Early-time spectra of SN 2002cx evolve very quickly and are dominated by lines from Fe-group elements; features from intermediate-mass elements (Ca, S, Si) are weak or absent. Mysterious emission lines are observed around 7000 \AA\ at about 3 weeks after maximum brightness. The nebular spectrum of SN 2002cx is also unique, consisting of narrow iron and cobalt lines. The observations of SN 2002cx are inconsistent with the observed spectral/photometric sequence, and provide a major challenge to our understanding of SNe Ia. No existing theoretical model can successfully explain all observed aspects of SN 2002cx.Comment: 60 pages, 12 figures. A high resolution PostScript version is available at http://astro.berkeley.edu/~weidong/sn2002cx.p

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“…Despite forty years of study (Hoyle & Fowler 1960), the mechanism whereby a degenerate carbon-oxygen white dwarf explodes, producing a Type Ia supernova (SN Ia), remains poorly understood (for a recent review see Hillebrandt & Niemeyer 2000). Early calculations assumed that central carbon ignition would lead to a detonation (Arnett 1969) that would incinerate the star entirely to iron. This proved inconsistent both with observations of features in the supernova spectrum from intermediate mass elements and with detailed calculations of isotopic nucleosynthesis.…”

Section: Introductionmentioning

confidence: 99%

Carbon Ignition in Type Ia Supernovae: An Analytic Model

Woosley

Wunsch

Kuhlen

2004

ApJ

148

219

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The observable properties of a Type Ia supernova are sensitive to how the nuclear runaway ignites in a Chandrasekhar mass white dwarf - at a single point at its center, off-center, or at multiple points and times. We present a simple analytic model for the runaway based upon a combination of stellar mixing-length theory and recent advances in understanding Rayleigh-Benard convection. The convective flow just prior to runaway is likely to have a strong dipolar component, though higher multipoles may contribute appreciably at the very high Rayleigh number (10$^{25}$) appropriate to the white dwarf core. A likely outcome is multi-point ignition with an exponentially increasing number of ignition points during the few tenths of a second that it takes the runaway to develop. The first sparks ignite approximately 150 - 200 km off center, followed by ignition at smaller radii. Rotation may be important to break the dipole asymmetry of the ignition and give a healthy explosion.Comment: 14 pages, 0 figures, submitted to ApJ, corrected typo in first author's nam

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Prostaglandin D Synthase in Human Semen

Cited by 6 publications

References 0 publications

The High‐Z Supernova Search: Measuring Cosmic Deceleration and Global Curvature of the Universe Using Type Ia Supernovae

The High‐Z Supernova Search: Measuring Cosmic Deceleration and Global Curvature of the Universe Using Type Ia Supernovae

SN 2002cx: The Most Peculiar Known Type Ia Supernova

Carbon Ignition in Type Ia Supernovae: An Analytic Model

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