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Galactic properties that favour star cluster formation: a statistical view
Sills, Alison; Eadie, Gwendolyn; Reina-Campos, Marta +1 more
The presence or absence of star clusters in galaxies, and the properties of star cluster populations compared to their host galaxy properties, are important observables for validating models of cluster formation, galaxy formation, and galaxy assembly. In this work, we apply a Bayesian approach to fit two models to data from surveys of young cluste…
Stable Coronal X-Ray Emission over 20 yr of XZ Tau
Schneider, P. C.; Principe, David A.; Wolk, Scott J. +3 more
XZ Tau AB is a frequently observed binary young stellar object in the Taurus Molecular Cloud; XZ Tau B has been classified as an EXOr object. We present new Chandra/HETG-ACIS-S observations of XZ Tau AB, complemented with variability monitoring of the system with XMM-Newton, to constrain the variability of this system and identify high-resolution …
Teutsch 76: A deep near-infrared study
Pandey, Rakesh; Sharma, Saurabh; Dewangan, Lokesh +9 more
We have performed a detailed analysis on the Teutsch 76 (T76) open cluster using the deep near-infrared (NIR) observations taken with the TANSPEC instrument mounted on the 3.6m Devasthal optical telescope along with the recently available high quality proper motion data from the Gaia data release 3 and deep photometric data from Pan-STARRS1 survey…
Multipoint Observations of Dispersive Scale Alfvénic Field-Line Resonances Associated With Substorm Auroral Beads
Frey, Harald U.; Wing, Simon; Chaston, Christopher C. +2 more
We present a case study of the field-aligned current (FAC) systems that transpire within the high-altitude auroral acceleration region of an "auroral bead" initiated double oval substorm observed on 23 February 2001 by the Cluster fleet. Conjunctive Cluster measurements and auroral images from IMAGE reveal that auroral bead current system formatio…
Identifying and characterizing the most heavily dust-obscured galaxies at 1 ≤ z ≤ 4
Willott, Chris J.; Martis, Nicholas S.; Muzzin, Adam +2 more
We present 65 extremely dust-obscured galaxies from the UltraVISTA DR3 survey of the COSMOS field at 1 < z < 4. In contrast to other studies of dusty galaxies, we select our sample based on dust attenuation measured by UV-MIR spectral energy distribution (SED) modelling that allows for extreme attenuation levels. We construct our sample by m…
Polarimetry of the potential binary supermassive black hole system in J1430+2303
Antonucci, R.; Blinov, D.; Liodakis, I. +6 more
Context. The growth of supermassive black holes (SMBHs) through merging has long been predicted but its detection remains elusive. However, a promising target has been discovered in the Seyfert-1 galaxy J1430+2303, where two SMBHs may be about to merge.
Aims: If a binary system truly lies at the center of J1430+2303, the usual symmetry expect…
Estimation of stellar parameters and mass accretion rate of classical T Tauri stars from LAMOST DR6
Mathew, Blesson; Kartha, Sreeja S.; Shridharan, B. +3 more
Classical T Tauri stars (TTS) are low-mass pre-main sequence stars with an active circumstellar environment. In this work, we present the identification and study of 260 classical TTS using LAMOST Data Release 6, among which 104 stars are newly identified. We distinguish classical TTS from giants and main-sequence dwarfs based on the
GMRT H I mapping of mid-infrared bright blue compact dwarf galaxies W1016+3754 and W2326+0608
Li, D.; Tsai, C. W.; Sengupta, C. +3 more
We present the results from deep 21 cm H I mapping of two nearby Blue Compact Dwarf Galaxies (BCDGs), W1016+3754 and W2326+0608, using the Giant Metrewave Radio Telescope (GMRT). These BCDGs are bright in mid-infrared data and undergoing active star formation. With the GMRT observations, we investigate the role of cold neutral gas as the fuel reso…
Magnetic reconnection as an erosion mechanism for magnetic switchbacks
Horbury, T. S.; Louarn, P.; Owen, C. J. +3 more
Context. Magnetic switchbacks are localised polarity reversals in the radial component of the heliospheric magnetic field. Observations from Parker Solar Probe (PSP) have shown that they are a prevalent feature of the near-Sun solar wind. However, observations of switchbacks at 1 au and beyond are less frequent, suggesting that these structures ev…
Ultraviolet and Visible Reflectance Spectra of Phobos and Deimos as Measured by the ExoMars-TGO/NOMAD-UVIS Spectrometer
Vandaele, A. C.; Daerden, F.; Thomas, I. R. +18 more
Spectroscopic measurements are a powerful tool to investigate the surface composition of airless bodies and provide clues of their origin. The composition and origin of Phobos and Deimos are still unknown and are currently widely debated. We present spectroscopic measurements of Phobos and Deimos at ultraviolet and visible wavelengths (250-650 nm)…