Search Publications
Magnetic fields under feedback: a case study of the massive star-forming hub G34.26 + 0.15
Pattle, Kate; Khan, Zacariyya Afzal; Graves, Sarah F.
We present 850
Relativistic X-ray reflection from the accreting millisecond X-ray pulsar IGR J17498-2921
Dewangan, Gulab C.; Mondal, Aditya S.; Raychaudhuri, Biplab +3 more
The accreting millisecond X-ray pulsar IGR J17498-2921 went into X-ray outburst on 2023 April 13-15, for the first time since its discovery on 2011 August 11. Here, we report on the first follow-up NuSTAR observation of the source, performed on 2023 April 23, around 10 d after the peak of the outburst. The NuSTAR spectrum of the persistent emissio…
Confirming the evolution of the dust mass function in galaxies over the past 5 billion years
Dunne, L.; Maddox, S.; Smith, M. W. L. +3 more
The amount of evolution in the dust content of galaxies over the past 5 billion years of cosmic history is contested in the literature. Here, we present a far-infrared (FIR) census of dust based on a sample of 29 241 galaxies with redshifts ranging from
Multiwavelength observations of the lensed quasar PKS 1830-211 during the 2019 γ-ray flare
Morselli, A.; Chen, A. W.; Iacolina, M. N. +32 more
PKS 1830 -211 is a γ-ray emitting, high-redshift (z =2.507 ± 0.002), lensed flat-spectrum radio quasar. During the period 2019 mid-February to mid-April, this source underwent a series of strong γ-ray flares that were detected by both AGILE-GRID (Gamma-Ray Imaging Detector) and Fermi Large Area Telescope (Fermi-LAT), reaching a maximum γ-ray flux …
Kinematic properties and ages of extended fast, neutral gas around η Carinae: tracing the pre-eruption bipolar wind
Smith, Nathan; Morse, Jon A.
We present proper-motion measurements and long-slit spectroscopy of the Mg II nebula around η Carinae obtained with the Wide Field Camera 3 and Space Telescope Imaging Spectrograph (STIS) aboard the Hubble Space Telescope. Detailed kinematics of the Mg II-emitting material constrain the geometry and history of mass-loss from η Car, and provide est…
Search for Stellar Companions of Exoplanet Host Stars with AstraLux/CAHA 2.2 m
Mugrauer, Markus; Buder, Sven; Ginski, Christian +3 more
Stellar multiplicity is a key aspect of exoplanet diversity, as the presence of more than one star in a planetary system can have both devastating and positive effects on its formation and evolution. In this paper, we present the results of a Lucky Imaging survey of 212 exoplanet host stars performed with AstraLux at the 2.2 m telescope of the Cen…
Star formation history of the post-collisional Cartwheel galaxy using AstroSat/UVIT FUV images
Gómez-González, V. M. A.; Mayya, Y. D.; Barway, Sudhanshu +1 more
We present the results obtained by analysing the new AstroSat Ultra-Violet Imaging Telescope (UVIT) far-ultraviolet (FUV) image of the collisional-ring galaxy Cartwheel. The FUV emission is principally associated with the star-forming outer ring, with no ultraviolet detection from the nucleus and inner ring. A few sources are detected in the regio…
Chandra X-ray analysis of Herbig Ae/Be stars
Mathew, Blesson; Manoj, P.; Kartha, Sreeja S. +4 more
Herbig Ae/Be (HAeBe) stars are intermediate-mass pre-main-sequence stars, characterized by infrared (IR) excess and emission lines. They are observed to emit X-rays, whose origin is a matter of discussion and not settled yet. X-ray emission is not expected in HAeBe stars, as they lack the subsurface convective zone. In this study, we retrieved obs…
TV Mon - post-mass transfer Algol-type binary with δ Scuti pulsations in primary component
Han, Zhanwen; Kovalev, Mikhail; Chen, Xuefei +4 more
We present a study of the detached eclipsing binary TV Mon using spectra from the LAMOST (Large Sky Area Multi-Object Fiber Spectroscopic Telescope) medium-resolution survey, ASAS-SN (All Sky Automated Survey for SuperNovae), and CoRoT (Convection, Rotation and planetary Transits) photometry. We apply multiple-epochs spectral fitting to derive rad…
Absence of a correlation between white dwarf planetary accretion and primordial stellar metallicity
Vanderburg, Andrew; Bieryla, Allyson; Latham, David W. +8 more
Over a quarter of white dwarfs have photospheric metal pollution, which is evidence for recent accretion of exoplanetary material. While a wide range of mechanisms have been proposed to account for this pollution, there are currently few observational constraints to differentiate between them. To investigate the driving mechanism, we observe a sam…