Spectroscopy and Time Variability of Absorption Lines in the Direction of the Vela Supernova Remnant

2000 ◽  
Vol 126 (2) ◽  
pp. 399-426 ◽  
Author(s):  
Alexandra N. Cha ◽  
Kenneth R. Sembach
Keyword(s):  
Supernova Remnant ◽  
Absorption Lines ◽  
Time Variability

scholarly journals XMM-Newton spectrum of the magnetar CXOU J171405.7–381031

2019 ◽  
Vol 71 (4) ◽  
Author(s):  
Haruka Watanabe ◽  
Aya Bamba ◽  
Shinpei Shibata ◽  
Eri Watanabe
Keyword(s):  
Power Law ◽  
Time Variation ◽  
Supernova Remnant ◽  
Component Model ◽  
Time Variability ◽  
Spectral Parameters ◽  
X Ray ◽  
Two Component ◽  
Photon Index ◽  
Higher Temperature

Abstract We observe the magnetar CXOU J171405.7−381031 with XMM-Newton and obtain the most reliable X-ray spectral parameters for this magnetar. After removing the flux from the surrounding supernova remnant CTB 37B, the radiation of CXOU J171405.7−381031 is best described by a two-component model, consisting of a blackbody and power law. We obtain a blackbody temperature of $0.58^{+0.03}_{-0.03}$ keV, a photon index of $2.15^{+0.62}_{-0.68}$, and an unabsorbed 2–10 keV band flux of $2.33^{+0.02}_{-0.02} \times 10^{-12}$ erg cm−2 s−1. These new parameters enable us to compare CXOU J171405.7−381031 with other magnetars, and it is found that the luminosity, temperature, and photon index of CXOU J171405.7−381031 are aligned with the known trend among the magnetar population with a slightly higher temperature, which could be caused by its young age. All magnetars with a spin-down age of less than 1000 yr show time variation or bursts except for CXOU J171405.7−381031. We explore the time variability for six observations between 2006 and 2015, but there is no variation larger than ∼10%.

scholarly journals Search for broad absorption lines in spectra of stars in the field of supernova remnant RX J0852.0-4622 (Vela Jr.)

2010 ◽  
Vol 519 ◽  
pp. A86 ◽  
Author(s):  
A. F. Iyudin ◽  
Yu. V. Pakhomov ◽  
N. N. Chugai ◽  
J. Greiner ◽  
M. Axelsson ◽  
...  
Keyword(s):  
Supernova Remnant ◽  
Absorption Lines ◽  
Broad Absorption ◽  
Broad Absorption Lines

scholarly journals Temporal and spatial variation of synchrotron X-ray stripes in Tycho’s supernova remnant

2020 ◽  
Vol 72 (5) ◽  
Author(s):  
Masamune Matsuda ◽  
Takaaki Tanaka ◽  
Hiroyuki Uchida ◽  
Yuki Amano ◽  
Takeshi Go Tsuru
Keyword(s):  
Surface Brightness ◽  
Supernova Remnant ◽  
Time Variability ◽  
X Rays ◽  
Temporal And Spatial Variation ◽  
Proton Acceleration ◽  
X Ray ◽  
Temporal And Spatial ◽  
Imaging And Spectroscopy ◽  
The Magnetic Field

Abstract The synchrotron X-ray “stripes” discovered in Tycho’s supernova remnant (SNR) have been attracting attention as they may be evidence for proton acceleration up to PeV. We analyzed Chandra data taken in 2003, 2007, 2009, and 2015 for imaging and spectroscopy of the stripes in the southwestern region of the SNR. Comparing images obtained at different epochs, we find that time variability of synchrotron X-rays is not limited to two structures previously reported but is more common in the region. Spectral analysis of nine bright stripes reveals not only their time variabilities but also a strong anti-correlation between the surface brightness and photon indices. The spectra of the nine stripes have photon indices of Γ = 2.1–2.6 and are significantly harder than those of the outer rim of the SNR in the same region with Γ = 2.7–2.9. Based on these findings, we indicate that the magnetic field is substantially amplified, and suggest that particle acceleration through a stochastic process may be at work in the stripes.

Δα/α FROM QSO ABSORPTION LINES DRIVEN BY AN OSCILLATING SCALAR FIELD

2005 ◽  
Vol 14 (03n04) ◽  
pp. 677-685 ◽  
Author(s):  
YASUNORI FUJII ◽  
SHUNTARO MIZUNO
Keyword(s):  
Fine Structure ◽  
Scalar Field ◽  
Structure Constant ◽  
Oscillatory Behavior ◽  
Absorption Lines ◽  
Fine Structure Constant ◽  
Time Variability ◽  
The Past

The new result on the QSO absorption lines from the VLT–UVES sample is compared with the past reports on the time-variability of the fine-structure "constant" derived from the Keck/HIRES observation, on the basis of an oscillatory behavior of the scalar field supposed to be responsible for the cosmological acceleration.

scholarly journals Unveiling Vela – time variability of Na i D lines in the direction of the Vela supernova remnant

2015 ◽  
Vol 455 (3) ◽  
pp. 2529-2550 ◽  
Author(s):  
N. Kameswara Rao ◽  
S. Muneer ◽  
David L. Lambert ◽  
B. A. Varghese
Keyword(s):  
Supernova Remnant ◽  
Time Variability

scholarly journals Unveiling Vela - Time Variability of Interstellar Lines in the Direction of the Vela Supernova Remnant II. Na D and Ca II

2017 ◽  
pp. stx139 ◽  
Author(s):  
N. Kameswara Rao ◽  
David L. Lambert ◽  
Arumalla B. S. Reddy ◽  
Ranjan Gupta ◽  
S. Muneer ◽  
...  
Keyword(s):  
Supernova Remnant ◽  
Time Variability

High-velocity iron absorption lines in supernova remnant 1006

1983 ◽  
Vol 269 ◽  
pp. L5 ◽  
Author(s):  
C.-C. Wu ◽  
M. Leventhal ◽  
C. L. Sarazin ◽  
T. R. Gull
Keyword(s):  
High Velocity ◽  
Supernova Remnant ◽  
Iron Absorption ◽  
Absorption Lines
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