Search Publications
A study on radio-loud interacting/non-interacting CMEs-associated SEPs and solar flares
Feng, Li; Pappa Kalaivani, P.; Prakash, O. +4 more
We have established a data set of 58 major hybrid SEP events associated with meter-to-decahectometer wavelength (m-to-DH) type II bursts, solar flares, and radio-load CMEs during the period of 1997-2014. The main focus of our study is to address the following two questions: Does the interaction of CMEs play a role in the enhancement of SEP intensi…
V1082-Sgr: A magnetic cataclysmic variable with a lobe-filling companion star
Xu, Xiaojie; Shao, Yong; Li, Xiang-Dong
V1082 Sgr is a cataclysmic variable with accretion luminosity above 1034 erg s-1, indicating a mass-transfer rate above 10^{-9} M_{⊙ } yr-1. However, its K-type companion was suggested to be underfilling its Roche lobe (RL), making the high mass-transfer rate a mystery. In this work we propose a possible model to e…
Global spectrophotometric properties of Asteroid (21) Lutetia using Rosetta-OSIRIS images
Masoumzadeh, N.; Boehnhardt, H.
We present a spectrophotometric analysis of the surface areas of asteroid (21) Lutetia that were imaged during the Rosetta flyby on July 2010 by the OSIRIS camera in the wavelength range 269 to 989 nm. A spectral slope change with respect to phase angle is found and interpreted as being due to areal diversity of Lutetia's surface. We applied Minna…
South-North Hemispheric Asymmetry of the FAE Distribution Around the Cusp Region: Cluster Observation
Dunlop, Malcolm; Carr, Chris; Torkar, Klaus +5 more
Cluster data from late July to early October were used to study the distribution of field-aligned electron (FAE) events around the two cusps. An FAE event was defined as electron parallel flux >3 × 108 (cm2 s)-1. The total number of FAE events around the two cusps was basically identical, but downward FAE events…
Integrated Spectra of Milky Way Globular Clusters
Trevisan, M.; Barbuy, B.; Moura, T. C. +1 more
Integrated spectra of Milky Way globular clusters (GCs) are reproduced by computing synthetic spectra taking into account individual element abundances. Five clusters were selected from their location in the Galactic bulge, for which integrated spectra were available in the WiFeS Atlas of Galactic Globular Cluster Spectra project. Our aim is to fu…
Optical IFU spectroscopy of a bipolar microquasar jet in NGC 300
Maccarone, T. J.; Motch, C.; Knigge, C. +9 more
We recently reported the discovery of a candidate jet-driving microquasar (S10) in the nearby spiral galaxy NGC 300. However, in the absence of kinematic information, we could not reliably determine the jet power or the dynamical age of the jet cavity. Here, we present optical Multi Unit Spectroscopic Explorer (MUSE) integral field unit (IFU) obse…
Relativistic Astronomy. II. In-flight Solution of Motion and Test of Special Relativity Light Aberration
Zhang, Bing; Yang, Yuan-Pei; Zhu, Jin-Ping
The Breakthrough Starshot project aims to send centimeter-sized, gram-scale “StarChip” probes to Alpha Centauri at a speed of ∼0.2 c. On the other hand, Zhang & Li recently proposed that transrelativistic cameras may be sent to any direction to study astronomical objects and test special relativity. To conduct such “relativistic astronomy,” on…
An ALMA/HST Study of Millimeter Dust Emission and Star Clusters
Dale, D. A.; Calzetti, D.; Smith, L. J. +7 more
We present results from a joint ALMA/HST study of the nearby spiral galaxy NGC 628. We combine the Hubble Space Telescope (HST) Legacy ExtraGalactic UV Survey (LEGUS) database of over 1000 stellar clusters in NGC 628 with ALMA Cycle 4 mm/submillimeter observations of the cold dust continuum that span ∼15 kpc2 including the nuclear regio…
Measuring the Yarkovsky effect with Las Cumbres Observatory
Lister, Tim; Farnocchia, Davide; Greenstreet, Sarah
The Las Cumbres Observatory (LCOGT) provides an ideal platform for follow-up and characterization of Solar System objects (e.g. asteroids, Kuiper belt objects (KBOs), comets, and near-Earth objects (NEOs)) as well as for the discovery of new objects. The LCOGT network allows for regular monitoring of a sample of targets, such as that of NEOs for w…
Performance Analysis of the SO/PHI Software Framework for On-board Data Reduction
Solanki, S. K.; Lagg, A.; Fiethe, B. +12 more
The Polarimetric and Helioseismic Imager (PHI) is the first deep-space solar spectropolarimeter, on-board the Solar Orbiter (SO) space mission. It faces: stringent requirements on science data accuracy, a dynamic environment, and severe limitations on telemetry volume. SO/PHI overcomes these restrictions through on-board instrument calibration and…