Direct determination of the hubble parameter using type IIn supernovae

Блинников, С. И.; Potashov, M. Sh.; Бакланов, П. В.; Dolgov, A. D.

doi:10.1134/s0021364012150039

Cited by 19 publications

(10 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As such, we focus below on the local distance ladder, the cosmic microwave background, and strong gravitational lensing cosmography. Other important techniques include cosmic chronometers [118][119][120][121][122][123][124], gravitational wave standard sirens [125][126][127][128][129], surface brightness fluctuations [130][131][132][133][134][135], Tully-Fisher relation [136][137][138][139][140][141][142], Type II supernovae [143][144][145][146][147][148], and HII galaxies [149][150][151][152].…”

Section: Distance Measurements In Cosmologymentioning

confidence: 99%

Hubble distancing: Focusing on distance measurements in cosmology

Greene,

Cyr-Racine

2021

Preprint

View full text Add to dashboard Cite

The Hubble-Lemaître tension is currently one of the most important questions in cosmology. Most of the focus so far has been on reconciling the Hubble constant value inferred from detailed cosmic microwave background measurement with that from the local distance ladder. This emphasis on one number -namely H 0 -misses the fact that the tension fundamentally arises from disagreements of distance measurements. To be successful, a proposed cosmological model must accurately fit these distances rather than simply infer a given value of H 0 . Using the newly developed likelihood package 'distanceladder ', which integrates the local distance ladder into MontePython, we show that focusing on H 0 at the expense of distances can lead to the spurious detection of new physics in models which change late-time cosmology. As such, we encourage the observational cosmology community to make their actual distance measurements broadly available to model builders instead of simply quoting their derived Hubble constant values.

show abstract

Section: Distance Measurements In Cosmologymentioning

confidence: 99%

Hubble distancing: Focusing on distance measurements in cosmology

Greene,

Cyr-Racine

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Basically, the system consisting of Eqs. (11) written for all ionization states and levels and ( 13) is already closed. However, we change one of the equations in (11) using the law of conservation of the number of particles:…”

Section: Kinetic Equationsmentioning

confidence: 99%

“…Among the great variety of distance measurement techniques there are methods that do not rely on the cosmological distance ladder, for example, the expanding photosphere method (EPM) (Kirshner and Kwan 1974), the spectral-fitting expanding atmosphere method (SEAM) (Baron et al 2004), or the dense shell method (DSM) (Blinnikov et al 2012;) that use type IIP and IIn supernovae (SNe) as objects. Note that using such a method as the SEAM requires the construction of a complete physical model for a type II SN that reproduces in detail its spectrum.…”

Section: Introductionmentioning

confidence: 99%

Time-dependent ionization in the envelopes of type II supernovae at the photospheric phase

2017

View full text Add to dashboard Cite

Abstract-The importance of allowance for the time-dependent effect in the kinetics at the photospheric phase during a supernova explosion has been confirmed by several independent research groups. The time-dependent effect provides a higher degree of hydrogen ionization in comparison with the steadystate solutions and strengthens the Hα line in the resulting simulated spectrum, with the intensity of the effect increasing with time. However, some researchers argue that the time-dependent ionization effect is unimportant. Its allowance leads to an insignificant strengthening of Hα in their modeling only in the first days after explosion. We have demonstrated the importance of the time-dependent effect with the models of SN 1999em as an example using the new original LEVELS software package. The role of a number of factors that can weaken the time-dependent effect has been checked. We have confirmed that the intensity of the effect is affected by the abundance of metal admixtures in the envelope, while the addition of extra levels to the model hydrogen atom weakens the time-dependent effect to a lesser degree and never removes it completely.

show abstract

“…In [25], using the observation data [26][27][28], we estimated the distance to the SN 2006gy supernova as D ≈…”

Section: Sn 2006gymentioning

confidence: 99%

Study of supernovae important for cosmology

et al. 2013

View full text Add to dashboard Cite

The dense shell method for the determination of distances to type?IIn supernovae has been briefly reviewed. Applying our method to SN 2006gy, SN 2009ip, and SN 2010jl supernovae, we have obtained distances in excellent agreement with the previously known distances to the parent galaxies. The dense shell method is based on the radiation hydrodynamic model of a supernova. The method of the blackbody model, as well as the correctness of its application for simple estimates of distances from observation data, has been justified.

show abstract

Direct determination of the hubble parameter using type IIn supernovae

Cited by 19 publications

References 25 publications

Hubble distancing: Focusing on distance measurements in cosmology

Hubble distancing: Focusing on distance measurements in cosmology

Time-dependent ionization in the envelopes of type II supernovae at the photospheric phase

Study of supernovae important for cosmology

Contact Info

Product

Resources

About