Trigonometric parallax of IRAS 22555+6213 with VERA: Three-dimensional view of sources along the same line of sight

Chibueze, James O.; Sakanoue, Hirofumi; Nagayama, Tomonori; Omodaká, Toshihiro; Handa, Toshihiro; Kamezaki, Tatsuya; Burns, Ross; Kobayashi, Hideyuki; Nakanishi, Hiroyuki; Honma, Mareki; Ueno, Yuji; Kurayama, Tomoharu; Matsuo, Mitsuhiro; Sakai, Nobuyuki

doi:10.1093/pasj/psu106

Cited by 12 publications

(7 citation statements)

References 23 publications

(35 reference statements)

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“…The functions K 1 and K 2 match, only if the relation f n Z i − 2B n = 0. Recall that when considering ansatzes (68) and (69), for Z 0 = 1 the value f n − 2B n is V min = k 1 and 2k 1 respectively for ( (40) and (42)). We want to obtain the solutions of equations for centrally symmetric gravity confirmed by the observational data.…”

Section: Analysis Of Equations In Centrally Symmetric Spacementioning

confidence: 99%

“…Figures 25 and 26 show the graphs of the field Z(r) and "observed circular rotational velocities". It is interesting to compare Figure 23 with the Figure 27 made on the basis of observational data [68], as well as on the website (National Astronomical Observatory of Japan, https://phys.org/ news/2012-10-mass-dark-revealed-precise-milky.html). In our case, for the considered parameter values, we can estimate the "period" T∼6.4 kpc (Figures 25 and 26).…”

Section: Numerical Solution Of Equations For the Model Of "Galaxy"mentioning

confidence: 99%

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The Ambiguity in the Definition and Behavior of the Gravitational and Cosmological `Coupling Constants’ in the Theory of Induced Gravity

Zaripov¹

2019

Symmetry

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This work is the extension of author's research, where the modified theory of induced gravity (MTIG) is proposed. The theory describes two systems (stages): Einstein (ES) and "restructuring" (RS). We consider equations with quadratic potential that are symmetric with respect to scale transformations. The solutions of the equations obtained for the case of spaces defined by the Friedman-Robertson-Walker metric, as well as for a centrally symmetric space are investigated. In our model arise effective gravitational and cosmological "constants" , which are defined by the "mean square" of the scalar fields. In obtained solutions the values of such parameters as "Hubble parameter", gravitational and cosmological "constants" in the RS stage fluctuate near monotonically evolving mean values. These parameters are matched with observational data, described as phenomena of dark energy and dark matter. The MTIG equations for the case of a centrally symmetric gravitational field, in addition to the Schwarzschild-de Sitter solutions, contain solutions that lead to the new physical effects at large distances from the center. The Schwarzschild-Sitter solution becomes unstable and enters the oscillatory regime. For distances greater than a certain critical value, the following effects can appear: deviation from General relativity and Newton's law of gravitational interaction, antigravity. Telescope (HST) and Planck observatory [5]. The Hubble Space Telescope is tuned to measure the parallax Milky Way Cepheid variables and the distances are 1.7-3.6 kpc (the modern Universe). The measurements of the Planck spacecraft correspond to distant galaxies (the early Universe is about 375,000 years old). In 2018, the accuracy of the measurement of H 0 is increased to 2.3 percent, which gives H 0 = 73.48 ± 1.66 km · s −1 Mpc −1 . In the early Universe, based on the data received from the "Planck" spacecraft and ΛCDM theory, the predicted value is H 0 = 67.0 ± 1.2 km · s −1 Mpc −1 . The difference is about 9 percent. The accuracy of the measurements is about 4.5 percent. There is also a variance in the observations made at different times and different methods. For example, as indicated in the work [6], the local and direct definition of H 0 gives H 0 = 73.24 ± 1.74 km · s −1 Mpc −1 , and the most recent value from [7] in consent with ΛCDM is 66.93 ± 0.62 km · s −1 Mpc −1 . In our opinion, the problem can be reduced to a strong binding of calculations of the Hubble parameter H 0 to the ΛCDM model. In our work we present a model where, due to the oscillatory regime in the solutions of equations, the Hubble parameter also fluctuates with respect to the mean value-which is also a function of time.3. The problems of so-called "dark energy" (DE) and "dark matter" (DM). The first of them can be reduced to the problem of existence and smallness of the "cosmological constant" (par. 1). The challenge posed by the cosmological constant problem [1] has spurred many attempts at directly modifying Einstein's gravity at large distances [8]. As example of s...

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Section: Analysis Of Equations In Centrally Symmetric Spacementioning

confidence: 99%

Section: Numerical Solution Of Equations For the Model Of "Galaxy"mentioning

confidence: 99%

The Ambiguity in the Definition and Behavior of the Gravitational and Cosmological `Coupling Constants’ in the Theory of Induced Gravity

Zaripov¹

2019

Symmetry

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“…There are mainly two different solutions of this problem. Assuming uncorrelated and normal uncertainties, one may introduce a'priori introduced "error floor" added in quadrature to raw uncertainties in order to obtain the reduced χ 2 ν 1 (e.g., Chibueze et al 2014;Forbrich et al 2013). Additional interferometric observations of compact extragalactic sources spread over the sky are used to measure broad-band delays (Reid et al 2009).…”

Section: New Evn Observations and Data Reductionmentioning

confidence: 99%

Physical properties and astrometry of radio-emitting brown dwarf TVLM 513-46546 revisited

Gawroński¹,

Goździewski²

2016

Mon. Not. R. Astron. Soc.

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We present multi-epoch astrometric observations of the M9 ultra-cool dwarf TVLM 513-46546 that is placed at the brown dwarf boundary. The new observations have been performed with the European VLBI Network (EVN) at 6 cm band. The target has been detected at 7 epochs spanning three years, with measured quiescent emission flux in the range 180 − 300 µJy. We identified four short-duration flaring events (0.5 − 2 mJy) with very high circular polarization (∼ 75% -100%). Properties of the observed radio flares support the physical model of the source that is characterized by the electron cyclotron maser instability responsible for outbursts of radio emission. Combined with Very Long Baseline Array (VLBA) earlier data, our detections make it possible to refine the absolute parallax π = 93.27 +0.18 −0.17 mas. Our measurements rule out TVLM 513-46546 companions more massive than Jupiter in orbits with periods longer than ∼ 1 yr.

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“…and B = −12.37 ± 1.12 km s −1 kpc −1 . It can be seen that all parameters are determined in this case with smaller errors than those in solutions (9), (10), or (11), but the R 0 estimation methods differ.…”

Section: Following the Recommendations Of Reid Et Al (2014)mentioning

confidence: 78%

Analysis of galactic rotation from masers based on a nonlinear oort model

Бобылев

Bajkova

2014

Astron. Lett.

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Based on data on Galactic masers with measured trigonometric parallaxes, we have tested a nonlinear model of Galactic rotation using generalized Oort formulas. This model is shown to yield pretty good results up to heliocentric distances of 3-4 kpc. The main feature of the method is the possibility of estimating the solar Galactocentric distance R 0 . This distance has been found by analyzing ≈60 masers to be R 0 = 8.3 ± 0.4 kpc. Our study of the threedimensional kinematics of more than 100 masers based on the Ogorodnikov-Milne model has shown that significant nonlinearities are present only in the xy plane (rotation around the Galactic z axis) due to the peculiarities of the Galactic rotation curve. No significant linear dependences have been found in the xz and yz planes. We show the presence of a wave in the velocities w as a function of coordinate x or distance R with a wavelength of 3 kpc and an amplitude of 10 km s −1 . The wave is particularly prominent in the Local and Perseus arms.

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Trigonometric parallax of IRAS 22555+6213 with VERA: Three-dimensional view of sources along the same line of sight

Cited by 12 publications

References 23 publications

The Ambiguity in the Definition and Behavior of the Gravitational and Cosmological `Coupling Constants’ in the Theory of Induced Gravity

The Ambiguity in the Definition and Behavior of the Gravitational and Cosmological `Coupling Constants’ in the Theory of Induced Gravity

Physical properties and astrometry of radio-emitting brown dwarf TVLM 513-46546 revisited

Analysis of galactic rotation from masers based on a nonlinear oort model

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