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Your search keyword '"Soja, A. C."' showing total 5 results
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5 results on '"Soja, A. C."'

1. Probing Saraswati's heart: evaluating the dynamical state of the massive galaxy cluster A2631 through a comprehensive weak-lensing and dynamical analysis

Author

Monteiro-Oliveira, R., Soja, A. C., Ribeiro, A. L. B., Bagchi, J., Sankhyayan, S., Candido, T. O., and Flores, R. R.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

In this work, we investigate the dynamical state of the galaxy cluster Abell 2631, a massive structure located at the core of the Saraswati supercluster. To do this, we first solve a tension found in the literature regarding the weak-lensing mass determination of the cluster. We do this through a comprehensive weak-lensing analysis, exploring the power of the combination of shear and magnification data sets. We find $M_{200}^{\rm wl} = 8.7_{-2.9}^{+2.5} \times 10^{14}$ M$_\odot$. We also determined the mass based on the dynamics of spectroscopic members, corresponding to $M_{200}^{\rm dy} = 12.2\pm3.0 \times 10^{14}$ M$_\odot$, consistent within a 68 per cent CL with the weak-lensing estimate. The scenarios provided by the mass distribution and dynamics of galaxies are reconciled with those provided by X-ray observations in a scenario where A2631 is observed at a late stage of merging., Comment: 14 pages, 10 figures, 6 tables. Accepted on Nov, 13 for publication in MNRAS

Published
2020
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3. Probing Saraswati's heart: evaluating the dynamical state of the massive galaxy cluster A2631 through a comprehensive weak-lensing and dynamical analysis.

Author

Monteiro-Oliveira, R, Soja, A C, Ribeiro, A L B, Bagchi, J, Sankhyayan, S, Candido, T O, and Flores, R R

Subjects
*LARGE scale structure (Astronomy), *GALAXY clusters, *GRAVITATIONAL lenses, *HEART
Abstract

In this work, we investigate the dynamical state of the galaxy cluster Abell 2631, a massive structure located at the core of the Saraswati supercluster. To do this, we first solve a tension found in the literature regarding the weak-lensing mass determination of the cluster. We do this through a comprehensive weak-lensing analysis, exploring the power of the combination of shear and magnification data sets. We find |$M_{200}^{\rm wl} = 8.7_{-2.9}^{+2.5} \times 10^{14}$| M⊙. We also determined the mass based on the dynamics of spectroscopic members, corresponding to |$M_{200}^{\rm dy} = 12.2\pm 3.0 \times 10^{14}$| M⊙, consistent within a 68 per cent CL with the weak-lensing estimate. The scenarios provided by the mass distribution and dynamics of galaxies are reconciled with those provided by X-ray observations in a scenario where A2631 is observed at a late stage of merging. [ABSTRACT FROM AUTHOR]

Published
2021
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5. The effect of timbre and pitch-pattern difficulty on the pitch perceptions of elementary-aged users of cochlear implants

Author

NC DOCKS at The University of North Carolina at Greensboro, Soja, Morgan C., NC DOCKS at The University of North Carolina at Greensboro, and Soja, Morgan C.

Abstract

The purpose of this study was to examine the effects of timbre and pitch-pattern difficulty on perceptions of same-difference between paired pitch patterns, altered and unaltered by timbre and pattern difficulty, among elementary-aged users of cochlear implants. Three null hypotheses were tested to determine the significance of these variables and their interaction on the pitch perceptions of children aged five through twelve, who used cochlear implants. Secondary purposes of the study included the examination of the relationships, if any, between age, age at implantation, and whether there were significant differences between participants' speech processor and pitch perceptions. The Adapted Musical Background Questionnaire was completed by each participant/parent(s)/guardian(s) and used to collect information about each participants' hearing history and musical experiences. The Pitch Discrimination Test, (PDT) was a researcher-developed, 36-item data collection instrument used to measure pitch perceptions of participants. Three timbres were used as stimuli, including the soprano voice, piano, and violin. Thirteen participant responses to the PDT were recorded individually. Results were analyzed using IBM© SPSS© Statistics Version 22. Results of the study revealed no effect of timbre (p = .511), or pitch-pattern difficulty (p = .971) on pitch perceptions. A significant interaction between timbre and pitch-pattern difficulty, however, was found (p = .046). Additional analyses revealed that there were significant differences between mean scores of PDT test items presented by violin and soprano voice for difficult patterns (p = .041), and items presented by soprano and piano for patterns with moderate difficulty (p = .041). The participants discriminated difficult patterns more accurately when the PDT items were presented by soprano voice than piano, but participants discriminated moderate patterns more accurately when the PDT items were presented piano than by soprano

Published
2015

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