The<i>Hubble Space Telescope</i>Key Project on the Extragalactic Distance Scale. XXVIII. Combining the Constraints on the Hubble Constant

Mould, Jeremy; Huchra, J. P.; Freedman, Wendy L.; Kennicutt, Robert C.; Ferrarese, Laura; Ford, H. C.; Gibson, Brad K.; Graham, J. A.; Hughes, Shaun M. G.; Illingworth, G. D.; Kelson, Daniel D.; Macri, Lucas M.; Madore, Barry F.; Sakai, Shoko; Sebo, Kim; Silbermann, N. A.; Stetson, P. B.

doi:10.1086/308304

Cited by 610 publications

(599 citation statements)

References 49 publications

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“…It is remarkable how well these figures agree with completely independent determinations: h = 0.72 ± 0.08 from the HST key project (Mould et al 2000;Freedman et al 2001); Ω b h 2 = 0.020 ± 0.001 (Burles et al 2001). This gives confidence that the tensor component must indeed be sub-dominant.…”

Section: Combination With the Cmb And Cosmological Parameters (A) Parsupporting

confidence: 79%

Large–scale structure and matter in the Universe

Peacock

2003

Philosophical Transactions of the Royal Society of London. Seri

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This paper summarizes the physical mechanisms that encode the type and quantity of cosmological matter in the properties of large-scale structure, and reviews the application of such tests to current datasets. The key lengths of the horizon size at matter-radiation equality and at last scattering determine the total matter density and its ratio to the relativistic density; acoustic oscillations can diagnose whether the matter is collisionless, and small-scale structure or its absence can limit the mass of any dark-matter relic particle. The most stringent constraints come from combining data on present-day galaxy clustering with data on CMB anisotropies. Such an analysis breaks the degeneracies inherent in either dataset alone, and proves that the universe is very close to flat. The matter content is accurately consistent with pure Cold Dark Matter, with about 25% of the critical density, and fluctuations that are scalar-only, adiabatic and scale-invariant. It is demonstrated that these conclusions cannot be evaded by adjusting either the equation of state of the vacuum, or the total relativistic density.

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Section: Combination With the Cmb And Cosmological Parameters (A) Parsupporting

confidence: 79%

Large–scale structure and matter in the Universe

Peacock

2003

Philosophical Transactions of the Royal Society of London. Seri

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“…Sanders et al (2003) estimated a distance of 13.9 Mpc, based on the assumption of the cosmic attractor model (Mould et al 2000). At this distance the luminosities of ULX1 would be reduced by ∼30 per cent.…”

Section: Discussionmentioning

confidence: 99%

The ultraluminous X-ray source NGC 5643 ULX1: a large stellar mass black hole accreting at super-Eddington rates?

Pintore

Zampieri

Sutton

et al. 2016

Mon. Not. R. Astron. Soc.

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A sub-set of the brightest ultraluminous X-ray sources (ULXs), with X-ray luminosities well above 10 40 erg s −1 , typically have energy spectra which can be well described as hard power-laws, and short-term variability in excess of ∼ 10%. This combination of properties suggests that these ULXs may be some of the best candidates to host intermediate mass black holes (IMBHs), which would be accreting at sub-Eddington rates in the hard state seen in Galactic X-ray binaries. In this work, we present a temporal and spectral analysis of all of the available XMM-Newton data from one such ULX, the previously poorly studied 2XMM J143242.1−440939, located in NGC 5643. We report that its high quality EPIC spectra can be better described by a broad, thermal component, such as an advection dominated disc or an optically thick Comptonising corona. In addition, we find a hint of a marginal change in the short-term variability which does not appear to be clearly related to the source unabsorbed luminosity. We discuss the implications of these results, excluding the possibility that the source may be host an IMBH in a low state, and favouring an interpretation in terms of super-Eddington accretion on to a black hole of stellar origin. The properties of NGC 5643 ULX1 allow us to associate this source to the population of the hard/ultraluminous ULX class.

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“…Furthermore, the acoustic peak measurement implied that the alternative to Λ was not an open universe but a strongly decelerating, Ω m = 1 universe that disagreed with the supernova data by 0.5 magnitudes, a level much harder to explain with observational or astrophysical effects. Finally, the combination of spatial flatness and improving measurements of the Hubble constant (e.g., H 0 = 71 ± 6 km s −1 Mpc −1 ; Mould et al 2000) provided an entirely independent argument for an energetically dominant accelerating component: a matter-dominated universe with Ω tot = 1 would have age t 0 = (2/3)H −1 0 ≈ 9.5 Gyr, too young to accommodate the 12-14 Gyr ages estimated for globular clusters (e.g., Chaboyer 1998).…”

Section: Historymentioning

confidence: 99%

Observational probes of cosmic acceleration

et al. 2013

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The accelerating expansion of the universe is the most surprising cosmological discovery in many decades, implying that the universe is dominated by some form of "dark energy" with exotic physical properties, or that Einstein's theory of gravity breaks down on cosmological scales. The profound implications of cosmic acceleration have inspired ambitious efforts to understand its origin, with experiments that aim to measure the history of expansion and growth of structure with percent-level precision or higher. We review in detail the four most well established methods for making such measurements: Type Ia supernovae, baryon acoustic oscillations (BAO), weak gravitational lensing, and the abundance of galaxy clusters. We pay particular attention to the systematic uncertainties in these techniques and to strategies for controlling them at the level needed to exploit "Stage IV" dark energy facilities such as BigBOSS, LSST, Euclid, and WFIRST. We briefly review a number of other approaches including redshift-space distortions, the Alcock-Paczynski effect, and direct measurements of the Hubble constant H 0 . We present extensive forecasts for constraints on the dark energy equation of state and parameterized deviations from General Relativity, achievable with Stage III and Stage IV experimental programs that incorporate supernovae, BAO, weak lensing, and cosmic microwave background data. We also show the level of precision required for clusters or other methods to provide constraints competitive with those of these fiducial programs. We emphasize the value of a balanced program that employs several of the most powerful methods in combination, both to cross-check systematic uncertainties and to take advantage of complementary information. Surveys to probe cosmic acceleration produce data sets that support a wide range of scientific investigations, and they continue the longstanding astronomical tradition of mapping the universe in ever greater detail over ever larger scales.

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TheHubble Space TelescopeKey Project on the Extragalactic Distance Scale. XXVIII. Combining the Constraints on the Hubble Constant

Abstract: Since the launch of Hubble Space Telescope nine years ago Cepheid distances to 25 galaxies have been determined for the purpose of calibrating secondary distance indicators. Eighteen of these have been measured by the HST Key Project

Cited by 610 publications

References 49 publications

Large–scale structure and matter in the Universe

Large–scale structure and matter in the Universe

The ultraluminous X-ray source NGC 5643 ULX1: a large stellar mass black hole accreting at super-Eddington rates?

Observational probes of cosmic acceleration

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