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A weak lensing analysis of the PLCK G100.2-30.4 cluster
Dahle, H.; Aghanim, N.; Arnaud, M. +12 more
We present a mass estimate of the Planck-discovered cluster PLCK G100.2-30.4, derived from a weak lensing analysis of deep Subaru griz images. We perform a careful selection of the background galaxies using the multi-band imaging data, and undertake the weak lensing analysis on the deep (1 h) r -band image. The shape measurement is based on the Ka…
X-Ray Perspective of the Twisted Magnetospheres of Magnetars
Göğüş, Ersin; Weng, Shan-Shan; Lin, Lin +1 more
Anomalous X-ray pulsars (AXPs) and soft gamma-ray repeaters (SGRs) are recognized as the most promising magnetar candidates, as indicated by their energetic bursts and rapid spin-downs. It is expected that the strong magnetic field leaves distinctive imprints on the emergent radiation both by affecting the radiative processes in atmospheres of mag…
Far-ultraviolet Study of the ζ-Ophiuchi H II Region
Choi, Yeon-Ju; Min, Kyoung-Wook; Seon, Kwang-Il
We report the results of our analysis of the H II region around ζ Oph based on far-ultraviolet (FUV) spectral imaging observations, together with data made in other wavelengths. We found that scattering by dust grains of the FUV photons, which originate mostly from ζ Oph, dominates the FUV emission in this region, while contributions from the two-…
Can we use weak lensing to measure total mass profiles of galaxies on 20 kpc scales?
Kobayashi, Masato I. N.; Leauthaud, Alexie; Rhodes, Jason +4 more
Current constraints on dark matter density profiles from weak lensing are typically limited to radial scales greater than 50-100 kpc. In this paper, we explore the possibility of probing the very inner regions of galaxy/halo density profiles by measuring stacked weak lensing on scales of only a few tens of kpc. Our forecasts focus on scales smalle…
Spatial variation of the cooling lines in the reflection nebula NGC 7023
Abergel, A.; White, G. J.; Lebouteiller, V. +7 more
Context. The north-west photo-dissociation region (PDR) in the reflection nebula NGC 7023 displays a complex structure. Filament-like condensations at the edge of the cloud can be traced via the emission of the main cooling lines, offering a great opportunity to study the link between the morphology and energetics of these regions.
Aims: We s…
MLSO Mark III K-Coronameter Observations of the CME Rate from 1989 - 1996
St. Cyr, O. C.; Webb, D. F.; Stanger, A. L. +5 more
We report here an attempt to fill the 1990 - 1995 gap in the CME rate using the Mauna Loa Solar Observatory's Mark III (Mk3) K-coronameter. The Mk3 instrument observed routinely several hours most days beginning in 1980 until it was upgraded to Mk4 in 1999. We describe the statistical properties of the CMEs detected during 1989 - 1996, and we dete…
Removal of atmospheric features in near infrared spectra by means of principal component analysis and target transformation on Mars: I. Method
Bellucci, G.; D'Aversa, E.; Carrozzo, F. G. +8 more
The aim of this work is to extract the surface contribution in the martian visible/near-infrared spectra removing the atmospheric components by means of Principal Component Analysis (PCA) and target transformation (TT). The developed technique is suitable for separating spectral components in a data set large enough to enable an effective usage of…
Background subtraction and transient timing with Bayesian Blocks
Schwope, A. D.; Worpel, H.
Aims: We aim to incorporate background subtraction into the Bayesian Blocks algorithm so that transient events can be timed accurately and precisely even in the presence of a substantial, rapidly variable background.
Methods: We developed several modifications to the algorithm and tested them on a simulated XMM-Newton observation of a bu…
Doppler-shift oscillations in the H I Lyα coronal emission line: spectroscopic signature of propagating kink waves?
Raymond, J. C.; Mancuso, S.
We report the first detection of long-period, slowly decaying Doppler-shift oscillations in the H i Lyα (1215.67 Å) coronal emission line with the Ultraviolet Coronagraph Spectrometer (UVCS) onboard the Solar and Heliospheric Observatory (SOHO) satellite. The UV spectral data were collected at 1.43 R⊙ above the eastern limb of the Sun d…
Detection of a Compact Nuclear Radio Source in the Local Group Elliptical Galaxy M32
Wang, Q. Daniel; Kraft, Ralph P.; Li, Zhiyuan +4 more
The Local Group compact elliptical galaxy M32 hosts one of the nearest candidate supermassive black holes (SMBHs), which has a previously suggested X-ray counterpart. Based on sensitive observations taken with the Karl G. Jansky Very Large Array (VLA), we detect for the first time a compact radio source coincident with the nucleus of M32, which ex…