Search Publications
Initial On-Sky Performance Testing of the Single-Photon Imager for Nanosecond Astrophysics (SPINA) System
Smoot, George F.; Lau, Albert Wai Kit; Shaimoldin, Nurzhan +4 more
This work presents an initial on-sky performance measurement of the Single-Photon Imager for Nanosecond Astrophysics (SPINA) system, part of our Ultra-Fast Astronomy (UFA) program. We developed the SPINA system based on the position-sensitive silicon photomultiplier (PS-SiPM) detector to record both photoelectron (P.E.) temporal and spatial inform…
How Hot Can Small Solar Flares Get?
Krucker, Säm; Reeves, Katharine K.; Barczynski, Krzysztof +4 more
The temperature reached by solar flares is a key parameter to understanding the physical process that causes the energy release. In this work, we analysed data from a Hinode Observing Programme that focused on high cadence measurement of the flaring plasma. This was carried out when the X-ray imager and spectrometer (STIX) on Solar Orbiter was obs…
Correction to: Spectroscopic follow-up of black hole and neutron star candidates in ellipsoidal variables from Gaia DR3
El-Badry, Kareem; Nagarajan, Pranav; Rodriguez, Antonio C. +2 more
High-fidelity 3D Reconstruction of Solar Coronal Physics with the Updated CROBAR Method
West, Matthew J.; Seaton, Daniel B.; Caspi, Amir +2 more
We present an extension of the Coronal Reconstruction Onto B-Aligned Regions (CROBAR) method to Linear Force Free Field (LFFF) extrapolations, and apply it to the reconstruction of a set of AIA, MDI, and STEREO EUVI data. The results demonstrate that CROBAR can not only reconstruct coronal emission structures, but also that it can help constrain t…
The active CGCG 077-102 NED02 galaxy within the Abell 2063 galaxy cluster
Adami, C.; Lima Neto, G. B.; Ulmer, M. P. +3 more
Context. Within the framework of investigating the link between the central super massive black holes in the cores of galaxies and the galaxies themselves, we detected a variable X-ray source in the center of CGCG 077-102 NED02, which is a member of the CGCG 077-102 galaxy pair within the Abell 2063 cluster of galaxies.
Aims: Our goal is to c…
Kataklismik Değişenlerin Gaia EDR3 Verilerinden Galaktik Model Parametreleri ve Uzay Yoğunluklarının Tayini
Bilir, Selçuk; Özdönmez, Aykut; Ak, Tansel +1 more
Bu çalışmada, Güneş civarındaki kataklismik değişenlerin (KD) Gaia trigonometrik paralakslarındaki yanlılıkları gideren Bailer-Jones ve diğ.'nin (2021) uzaklıkları kullanılarak Galaktik model parametreleri, ışıma gücü fonksiyonları ve uzay dağılımları belirlenmiştir. G görünen parlaklıklarına getirilen sınırlamalar neticesinde sistemlerin tamlık u…
A low-mass hub-filament with double centre revealed in NGC 2071-North
Shimajiri, Y.; Palmeirim, P.; Könyves, Vera +2 more
We present the first analysis in NGC 2071-North as a resolved hub-filament featuring a double centre. This ~1.5 × 1.5 pc2 scale filament hub contains ~500 M⊙. Seen from Planck, magnetic field lines may have facilitated the gathering of material at this isolated location. The energy balance analysis, supported by infalling gas…
Study of the radial dependence of Forbush decreases at 0.28-1 au using data from the Helios 1 and 2 spacecraft
Papaioannou, Athanasios; Richardson, Ian G.; Belov, Anatoly +4 more
We identify and investigate cosmic ray Forbush decreases (FDs) observed in the E > 50 MeV data from the Helios 1 and 2 spacecraft, spanning from 1974-1985 and covering heliocentric distances in the range 0.28-1 au. A Helios FD catalogue is compiled, including the characteristics of the cosmic ray variations, as well as those of the solar wind (…
X-ray Spectroscopy at Mercury with the Mercury Imaging X-ray Spectrometer
Hall, Graeme
In December 2025, the joint ESA and JAXA BepiColombo spacecraft will enter orbit around Mercury to begin a two-year mission. Among the 16 instruments aboard BepiColombo is the Mercury Imaging X-ray Spectrometer (MIXS), which offers high-resolution (~10 km per pixel) imaging capabilities for low-energy (0-10 keV) X-ray photons. This information wil…
Infrared Photometric Distance to WZ Hya
Allen, M. L.; Ritterby, C.
A distance to the RR Lyrae star WZ Hya was determined to test how well period-luminosity-metallicity (PLZ) relations agree with current parallax measurements from Gaia. We obtained 120 photometric observations in the B, V, ip, and zs filters from 16 February to 28 May 2022. Fluxes were extracted using six-aperture photometry methods. The period fo…