Meerkat-Based Multi-Wavelength Study of Supernova Remnant SN386 (G7.7-3.7)/ (Record no. 93774)

MARC details
000 -LEADER
fixed length control field 03848nam a22002057a 4500
003 - CONTROL NUMBER IDENTIFIER
control field KE-MeUCS
005 - DATE AND TIME OF LATEST TRANSACTION
control field 20260609164955.0
008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION
fixed length control field 260609b |||||||| |||| 00| 0 eng d
020 ## - INTERNATIONAL STANDARD BOOK NUMBER
International Standard Book Number
040 ## - CATALOGING SOURCE
Transcribing agency KE-MeUCS
Modifying agency KE-MeUCS
050 ## - LIBRARY OF CONGRESS CALL NUMBER
Classification number QB843.S9.M8 2025
100 ## - MAIN ENTRY--PERSONAL NAME
Personal name Mwaniki, Patrick Njoroge
245 ## - TITLE STATEMENT
Title Meerkat-Based Multi-Wavelength Study of Supernova Remnant SN386 (G7.7-3.7)/
Statement of responsibility, etc Patrick Njoroge Mwaniki
260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT)
Place of publication, distribution, etc Meru:
Name of publisher, distributor, etc Meru University of Science and Technology,
Date of publication, distribution, etc 2025.
300 ## - PHYSICAL DESCRIPTION
Extent ix, 75p.
500 ## - GENERAL NOTE
General note Includes Reference
520 ## - SUMMARY, ETC.
Summary, etc Supernova remnant SN386(G7.7-3.7) presented captivating attention for multi-wavelength<br/>observation. In this study, we investigated the structural characteristics of G7.7-3.7 with<br/>higher resolution MeerKAT observation at 1284 MHz, revealing intricate details of its<br/>morphology and emission mechanisms. MeerKAT observations revealed G7.7-3.7 as an<br/>almost circular structure with filamentary features, manifesting in various blowouts. The<br/>western boundary exhibited a strong bright blowout, while the southern perimeter show<br/>cased extended bright filaments with feather-like structures, seemingly disconnected from<br/>the western blowout. Moreover, the eastern region presented a faint blowout with a cen<br/>tralized bright point source, while faint elongated filaments traversed the northwest, linked<br/>the eastern point source and western blowout and progressed outward uniformly. Spectral<br/>index analysis indicated a steep spectrum (𝛼 ranged ∼ 0 to ∼-3), suggesting a combination<br/>of synchrotron and few traces of thermal emissions at the edges of bright blowouts. Bright<br/>blowouts with a less steep spectrum ranging from ∼-0.5 to ∼-1.5 were dominated by<br/>shock-accelerated particles encountering irregularities and weakening in magnetic fields.<br/>Spectral index values close to 𝛼 = 0, showed the presence of traces of thermal emissions<br/>from shock-heated gases, especially at the edge of the bright blowout. However, the faint<br/>emissions along the filaments connecting the eastern and western blowouts with a very<br/>steep spectral index of ∼-3 comprised synchrotron emissions from aged particles that had<br/>dissipated energy due to turbulent re-acceleration. Analysis of MeerKAT and VLA data<br/>gave an expansion of Δ𝜃 = 9 ± 0.45 arcsec over a period of Δt = 31.907 yr corresponding<br/>to an expansion rate 𝜃 = 0.282 ± 0.014 arcsec yr−1 . The data recorded a shock speed of<br/>5883 ± 294 km s−1 and an age of 1636 ± 115 years. The revised age fitted with the explo<br/>sion event of 386 CE and the observed data in 2023. Furthermore, our multi-wavelength<br/>investigation unveiled an intriguing structure within the southern radio blowout exhibiting<br/>a convergence of features such as the bright radio blowout, a prominent X-ray arc and two<br/>faint optical filaments aligned with the X-ray bright arc. We attributed the bright radio<br/>blowouts to the non-uniform mass outflow from the localized high-density population of<br/>the shock-accelerated particles and the weakening of magnetic fields along its perimeter.<br/>Thermal emissions traces along the edges of blowouts resulted from shock-heated gases<br/>intensifying in the south due to the presence of high-density ISM. Thus, we proposed that<br/>the supernova of G7.7-3.7 occurred in an environment of varying densities of interstellar<br/>medium (ISM). Consequently, this environment facilitated X-ray emissions and the forma<br/>tion of faint optical filaments due to collisions with the ISM and the circumstellar materials<br/>from the progenitor star respectively. Our findings shed light on the complex interplay of<br/>physical processes within G7.7-3.7, offering valuable insights into the dynamics and evo<br/>lution of supernova remnants.
856 ## - ELECTRONIC LOCATION AND ACCESS
Uniform Resource Identifier https://repository.must.ac.ke/handle/123456789/1638
942 ## - ADDED ENTRY ELEMENTS (KOHA)
Source of classification or shelving scheme Library of Congress Classification
Koha item type Thesis
Cataloguer Mercy Musungu
Holdings
Withdrawn status Lost status Source of classification or shelving scheme Damaged status Not for loan Home library Current library Shelving location Date acquired Source of acquisition Cost, normal purchase price Cataloger Total Checkouts Full call number Barcode Date last seen Price effective from Koha item type
    Library of Congress Classification     Meru University Meru University Periodical Section 09/06/2026 Meru University of science and Technology (MUST) 0.00 Mercy Musungu   QB843.S9.M8 2025 26-39327 09/06/2026 09/06/2026 Thesis

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