ALMA CO Observations of Supernova Remnant N63A in the Large Magellanic Cloud: Discovery of Dense Molecular Clouds Embedded within Shock-ionized and Photoionized Nebulae

Journal article


Publication Details

Author(s): Sano H, Matsumura H, Nagaya T, Yamane Y, Alsaberi RZE, Filipovic MD, Tachihara K, Fujii K, Tokuda K, Tsuge K, Yoshiike S, Onishi T, Kawamura A, Minamidani T, Mizuno N, Yamamoto H, Inutsuka S, Inoue T, Maxted N, Rowell G, Sasaki M, Fukui Y
Journal: Astrophysical Journal
Publication year: 2019
Volume: 873
Journal issue: 1
ISSN: 0004-637X
eISSN: 1538-4357


Abstract

We carried out new (CO)-C-12(J = 1-0, 3-2) observations of a N63A supernova remnant (SNR) from the LMC using the Atacama Large Millimeter/submillimeter Array (ALMA) and Atacama Submillimeter Telescope Experiment. We find three giant molecular clouds toward the northeast, east, and near the center of the SNR. Using the ALMA data, we spatially resolved clumpy molecular clouds embedded within the optical nebulae in both the shock-ionized and photoionized lobes discovered by previous H alpha and [S II] observations. The total mass of the molecular clouds is similar to 800 M-circle dot for the shock-ionized region and similar to 1700 M-circle dot for the photoionized region. Spatially resolved X-ray spectroscopy reveals that the absorbing column densities toward the molecular clouds are similar to(1.5-6.0) x 10(21) cm(-2), which are similar to 1.5-15 times less than the averaged interstellar proton column densities for each region. This means that the X-rays are produced not only behind the molecular clouds, but also in front of them. We conclude that the dense molecular clouds have been completely engulfed by the shock waves, but have still survived erosion owing to their high density and short interacting time. The X-ray spectrum toward the gas clumps is well explained by an absorbed power-law model or a high-temperature plasma model, in addition to thermal plasma components, implying that the shock-cloud interaction is efficiently working for both cases through the shock ionization and magnetic field amplification. If the hadronic gamma-ray is dominant in the GeV. band, the total energy of the cosmic-ray protons is calculated to be similar to(0.3-1.4) x 10(49) erg, with an estimated interstellar proton density of similar to 190 +/- 90 cm(-3), containing both the shock-ionized gas and neutral atomic hydrogen.


FAU Authors / FAU Editors

Sasaki, Manami Prof. Dr.
Professur für Multiwellenlängenastronomie


External institutions with authors

Nagoya University / 名古屋大学
National Astronomical Observatory of Japan / 国立天文台(NAOJ)
Osaka Prefecture University 大阪府立大学
University of Adelaide
University of New South Wales (UNSW)
University of Tokyo
University of Western Sydney


How to cite

APA:
Sano, H., Matsumura, H., Nagaya, T., Yamane, Y., Alsaberi, R.Z.E., Filipovic, M.D.,... Fukui, Y. (2019). ALMA CO Observations of Supernova Remnant N63A in the Large Magellanic Cloud: Discovery of Dense Molecular Clouds Embedded within Shock-ionized and Photoionized Nebulae. Astrophysical Journal, 873(1). https://dx.doi.org/10.3847/1538-4357/ab02fd

MLA:
Sano, H., et al. "ALMA CO Observations of Supernova Remnant N63A in the Large Magellanic Cloud: Discovery of Dense Molecular Clouds Embedded within Shock-ionized and Photoionized Nebulae." Astrophysical Journal 873.1 (2019).

BibTeX: 

Last updated on 2019-23-08 at 08:32