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Isotropy-violation diagnostics for B-mode polarization foregrounds to the Cosmic Microwave Background
Huffenberger, Kevin; Rotti, Aditya
Isotropy-violation statistics can highlight polarized galactic foregrounds that contaminate primordial B-modes in the Cosmic Microwave Background (CMB). We propose a particular isotropy-violation test and apply it to polarized Planck 353 GHz data, constructing a map that indicates B-mode foreground dust power over the sky. We build our main isotro…
Smoothing methods comparison for CMB E- and B-mode separation
Wang, Yi-Fan; Wang, Kai; Zhao, Wen
The anisotropies of the B-mode polarization in the cosmic microwave background radiation play a crucial role in the study of the very early Universe. However, in real observations, a mixture of the E-mode and B-mode can be caused by partial sky surveys, which must be separated before being applied to a cosmological explanation. The separation meth…
Acoustic and Slow Sausage Oscillations in the Stratified Solar Photosphere: Hinode Observations and Phase Relationships
Tsap, Y. T.; Stepanov, A. V.; Kopylova, Y. G.
Based on the linearized magnetohydrodynamic (MHD) equations within the framework of the thin flux tube approximation, the phase relationships between the disturbed quantities of evanescent acoustic and slow sausage MHD modes excited in the adiabatically stratified solar atmosphere are considered. It has been shown that the sign of the phase differ…
A systematic study of evolved supernova remnants in the large and small Magellanic Clouds with Suzaku
Yamaguchi, Hiroya; Tamagawa, Toru; Takeuchi, Yoko
Identifying the origin type (i.e., Type Ia or core-collapse) of supernova remnants (SNRs) is crucial to determining the rates of supernova (SN) explosions in a galaxy, which is a key to understanding its recent chemical evolution. However, evolved SNRs in the so-called Sedov phase are dominated by the swept-up interstellar medium (ISM), making it …
Discovery of a long-lived, high-amplitude dusty infrared transient
Maccarone, T. J.; Torres, M. A. P.; Nelemans, G. +15 more
We report the detection of an infrared-selected transient which has lasted at least five years, first identified by a large mid-infrared and optical outburst from a faint X-ray source detected with the Chandra X-ray Observatory. In this paper we rule out several scenarios for the cause of this outburst, including a classical nova, a luminous red n…
The 26 December 2001 Solar Event Responsible for GLE63. I. Observations of a Major Long-Duration Flare with the Siberian Solar Radio Telescope
Grechnev, V. V.; Kochanov, A. A.
Ground level enhancements (GLEs) of cosmic-ray intensity occur, on average, once a year. Because they are rare, studying the solar sources of GLEs is especially important to approach understanding their origin. The SOL2001-12-26 eruptive-flare event responsible for GLE63 seems to be challenging in some aspects. Deficient observations limited our u…
An intermediate-mass black hole candidate in M51?
Earnshaw, H. M.
We present the current results of an investigation into M51 ULX-7, using archival data from XMM-Newton, Chandra and NuSTAR, and optical and radio data from HST and VLA. The source has a consistently hard power-law X-ray spectrum and high short-term variability. This is unusual variability behaviour for a ULX, as we would expect highly variable ULX…
Near-Infrared Polarization Source Catalog of the Northeastern Regions of the Large Magellanic Cloud
Tamura, Motohide; Jeong, Woong-Seob; Pak, Soojong +2 more
We present a near-infrared band-merged photometric and polarimetric catalog for the 39‧ × 69‧ fields in the northeastern part of the Large Magellanic Cloud (LMC), which were observed using SIRPOL, an imaging polarimeter of the InfraRed Survey Facility. This catalog lists 1858 sources brighter than 14 mag in the H band with a polarization signal-to…
Polar cap magnetic field reversals during solar grand minima: could pores play a role?
Švanda, Michal; Brun, Allan Sacha; Roudier, Thierry +1 more
We study the magnetic flux carried by pores located outside active regions with sunspots and investigate their possible contribution to the reversal of the global magnetic field of the Sun. We find that they contain a total flux of comparable amplitude to the total magnetic flux contained in polar caps. The pores located at distances of 40-100 Mm …
The peculiar megamaser AGN NGC 1194: Comparison with the warped disk candidates NGC 1068 and NGC 4258
Vasylenko, A.; Fedorova , E.; Hnatyk, B. I. +1 more
We analyze the X-ray properties of the Compton-thick Seyfert 1.9 radio quiet AGN in NGC 1194 using INTEGRAL (ISGRI), XMM-Newton (EPIC), Swift (BAT and XRT), and Suzaku (XIS) observations. There is a set of Fe-K lines in the NGC 1194 spectrum with complex relativistic profiles that can be considered as a sign of either a warped Bardeen-Petterson ac…