Search Publications
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…
Accurate PSF-matched photometry and photometric redshifts for the extreme deep field with the Chebyshev-Fourier functions
Molino, A.; Benítez, N.; Jiménez-Teja, Y. +1 more
Photometric redshifts, which have become the cornerstone of several of the largest astronomical surveys like PanStarrs, DES, J-PAS and LSST, require precise measurements of galaxy photometry in different bands using a consistent physical aperture. This is not trivial, due to the variation in the shape and width of the point spread function (PSF) i…
Time Evolution of Force-Free Parameter and Free Magnetic Energy in Active Region NOAA 10365
van Driel-Gesztelyi, L.; Romano, P.; Valori, G. +6 more
We describe the variation of the accumulated coronal helicity derived from the magnetic helicity flux through the photosphere in active region (AR) NOAA 10365, where several large flares and coronal mass ejections (CMEs) occurred. We used SOHO/MDI full-disk line-of-sight magnetograms to measure the helicity flux, and the integral of GOES X-ray flu…
On the status of orbital high-resolution repeat imaging of Mars for the observation of dynamic surface processes
Muller, J. -P.; Sidiropoulos, P.
This work deals with the meta-data analysis of high-resolution orbital imagery that was acquired over the last four decades of Mars. The objective of this analysis is to provide a starting point for planetary scientists who are interested in examining the martian surface in order to detect changes that are related to not fully understood natural p…