Search Publications
Magnetic fields inferred by Solar Orbiter: A comparison between SO/PHI-HRT and SDO/HMI
Woch, J.; Solanki, S. K.; Schou, J. +31 more
Context. The High Resolution Telescope (HRT) of the Polarimetric and Helioseismic Imager on board the Solar Orbiter spacecraft (SO/PHI) and the Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamics Observatory (SDO) both infer the photospheric magnetic field from polarised light images. SO/PHI is the first magnetograph to move out of …
The GALAH survey: new diffuse interstellar bands found in residuals of 872 000 stellar spectra
Lewis, Geraint F.; Buder, Sven; Bland-Hawthorn, Joss +11 more
We use more than 872 000 mid- to high-resolution (R ~ 20 000) spectra of stars from the GALactic Archaeology with HERMES (GALAH) survey to discern the spectra of diffuse interstellar bands (DIBs). We use four windows with the wavelength ranges 4718-4903, 5649-5873, 6481-6739, and 7590-7890 Å, giving a total coverage of 967 Å. We produce ~400 000 s…
Measuring the streaming motion in the Milky Way disc with Gaia EDR3+
Bland-Hawthorn, Joss; Sharma, Sanjib; Khanna, Shourya +1 more
We map the 3D kinematics of the Galactic disc out to 3.5 kpc from the Sun, and within 0.75 kpc from the mid-plane of the Galaxy. To this end, we combine high-quality astrometry from Gaia EDR3, with heliocentric line-of-sight velocities from Gaia DR2, and spectroscopic surveys including APOGEE, GALAH, and LAMOST. We construct an axisymmetric model …
A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE). XV. The Hα luminosity function of the Virgo cluster
Ferrarese, L.; Boquien, M.; Balogh, M. +17 more
We use a complete set of deep narrow-band imaging data for 384 galaxies gathered during the Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE) to derive the first Hα luminosity function of the Virgo cluster within its virial radius. The data, which are sensitive to the emission of a single O-early B ionising star, allow us to cover …
The cosmic DANCe of Perseus. I. Membership, phase-space structure, mass, and energy distributions
Miret-Roig, N.; Bouy, H.; Sarro, L. M. +4 more
Context. Star-forming regions are excellent benchmarks for testing and validating theories of star formation and stellar evolution. The Perseus star-forming region, being one of the youngest (< 10 Myr), closest (280−320 pc), and most studied in the literature, is a fundamental benchmark.
Aims: We aim to study the membership, phase-space st…
Time-variable Jet Ejections from RW Aur A, RY Tau, and DG Tau
Ohyama, Youichi; Pyo, Tae-Soo; Liu, Chun-Fan +17 more
We present Gemini-NIFS, Very Large Telescope-SINFONI, and Keck-OSIRIS observations of near-IR [Fe II] emission that are associated with well-studied jets from three active T Tauri stars-RW Aur A, RY Tau, and DG Tau-taken from 2012 to 2021. We primarily cover the redshifted jet from RW Aur A and the blueshifted jets from RY Tau and DG Tau, in order…
Interstellar Polarization Survey. III. Relation between Optical Polarization and Reddening in the General Interstellar Medium
Magalhães, A. M.; Kawabata, Koji S.; Rodrigues, C. V. +4 more
Optical starlight can be partially polarized while propagating through the dusty, magnetized interstellar medium (ISM). The polarization efficiency describes the polarization intensity fraction per reddening unit, P V /E(B - V), related to the interstellar dust grains and magnetic field properties. The maximum value observed, [P …
The Radio Parallax of the Crab Pulsar: A First VLBI Measurement Calibrated with Giant Pulses
Deller, Adam T.; Kirsten, Franz; van Kerkwijk, Marten H. +2 more
We use four observations with the European very long baseline interferometry (VLBI) network to measure the first precise radio parallax of the Crab Pulsar. We found two in-beam extragalactic sources just outside the Crab Nebula, with one bright enough to use as a background reference source in our data. We use the Crab Pulsar's giant pulses to det…
Rapid Rotation of an Erupting Prominence and the Associated Coronal Mass Ejection on 13 May 2013
Zhang, Qingmin; Ji, Haisheng; Zhou, Yuhao
In this paper, we report the multiwavelength observations of an erupting prominence and the associated coronal mass ejection (CME) on 13 May 2013. The event occurs behind the western limb in the field of view of the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory (SDO) spacecraft. The prominence is supported by a highly …
Understanding the Deflection of the "Cartwheel CME": Data Analysis and Modeling
Vourlidas, Angelos; Balmaceda, Laura A.; Cécere, Mariana +1 more
We study the low corona evolution of the "Cartwheel" coronal mass ejection (CME; 2008 April 9) by reconstructing its three-dimensional path and modeling it with magnetohydrodynamic simulations. This event exhibited a double deflection that has been reported and analyzed in previous works but whose underlying cause remained unclear. The Cartwheel C…