Search Publications
Identification of SRGt 062340.2-265751 as a bright, strongly variable, novalike cataclysmic variable
Maitra, Chandreyee; Wilms, Jörn; Buckley, David A. H. +10 more
We report the identification and follow-up of the transient SRGt 062340.2-265751 detected with both instruments on board the Spektrum-Roentgen-Gamma mission. Optical spectroscopy of the G = 12.5 counterpart firmly classifies the object as a novalike cataclysmic variable (CV) at a distance of 495 pc. A highly significant TESS period of 3.941 h, ten…
Pitch Angle Distribution of MeV Electrons in the Magnetosphere of Jupiter
Witasse, O.; Kollmann, P.; Nénon, Q. +3 more
The magnetosphere of Jupiter harbors the most extreme fluxes of MeV electrons in the solar system and therefore provides a testbed of choice to understand the origin, transport, acceleration, and loss of energetic electrons in planetary magnetospheres. Along this objective, the Pitch Angle Distribution (PAD) of energetic electrons may reveal signa…
3D-DASH: The Widest Near-infrared Hubble Space Telescope Survey
van Dokkum, Pieter G.; Franx, Marijn; Muzzin, Adam +15 more
The 3D-Drift And SHift (3D-DASH) program is a Hubble Space Telescope (HST) WFC3 F160W imaging and G141 grism survey of the equatorial COSMOS field. 3D-DASH extends the legacy of HST near-infrared imaging and spectroscopy to degree-scale swaths of the sky, enabling the identification and study of distant galaxies (z > 2) that are rare or in shor…
The complex globular cluster system of the S0 galaxy NGC 4382 in the outskirts of the Virgo Cluster
Cortesi, Arianna; Chies-Santos, Ana L.; Mendes de Oliveira, Claudia +10 more
NGC 4382 is a merger-remnant galaxy that has been classified as morphological type E2, S0, and even Sa. In this work, we performed a photometric and spectroscopic analysis of the globular cluster (GC) system of this peculiar galaxy in order to provide additional information about its history. We used a combination of photometric data in different …
The lively accretion disc in NGC 2992 - II. The 2019/2021 X-ray monitoring campaigns
Bianchi, S.; De Marco, B.; Matt, G. +8 more
We report on the short- and long-term X-ray properties of the bright nearby Seyfert 2 galaxy NGC 2992, which was extensively observed with Swift, XMM-Newton, and NuSTAR. Swift targeted the source more than 100 times between 2019 and 2021 in the context of two monitoring campaigns. Both time-averaged and time-resolved analyses are performed, and we…
Kiloparsec-scale Imaging of the CO(1-0)-traced Cold Molecular Gas Reservoir in a z 3.4 Submillimeter Galaxy
van der Werf, Paul; Walter, Fabian; Narayanan, Desika +9 more
We present a high-resolution study of the cold molecular gas as traced by CO(1-0) in the unlensed z ~ 3.4 submillimeter galaxy SMM J13120+4242, using multiconfiguration observations with the Karl G. Jansky Very Large Array (JVLA). The gas reservoir, imaged on 0.″39 (~3 kpc) scales, is resolved into two components separated by ~11 kpc with a total …
Li Distribution, Kinematics, and Detailed Abundance Analysis among Very Metal-poor Stars in the Galactic Halo from the HESP-GOMPA Survey
Beers, Timothy C.; Sivarani, Thirupathi; Pandey, Jeewan C. +3 more
We present a study on the detailed elemental abundances of newly identified, bright, very metal-poor stars with the detection of lithium, initially observed as part of the SDSS/MARVELS pre-survey. These stars were selected for high-resolution spectroscopic follow-up as part of the HESP-GOMPA survey. In this work, we discuss the Li abundances detec…
First detection of a magnetic field in low-luminosity B[e] stars. New scenarios for the nature and evolutionary stages of FS CMa stars
Manset, N.; Sestito, F.; Raj, A. +8 more
We report the first detection of the magnetic field in a star of FS CMa type, a subgroup of objects characterized by the B[e] phenomenon. The split of magnetically sensitive lines in IRAS 17449+2320 determines the magnetic field modulus of 6.2 ± 0.2 kG. Spectral lines and their variability reveal the presence of a B-type spectrum and a hot continu…
Gaussian process model for the local stellar velocity field from Gaia data release 2
Widrow, Lawrence M.; Nelson, Patrick
We model the local stellar velocity field using position and velocity measurements for 4M stars from the second data release of Gaia. We determine the components of the mean or bulk velocity in $\sim 27\, 000$ spatially defined bins. Our assumption is that these quantities constitute a Gaussian process where the correlation between the bulk veloci…
Unravelling UBC 274: A morphological, kinematical, and chemical analysis of a disrupting open cluster
Castro-Ginard, A.; Casamiquela, L.; Soubiran, C. +8 more
Context. Open clusters in the process of disruption help to understand the formation and evolution of the Galactic disk. The wealth and homogeneity of Gaia data have led to the discovery of several open clusters with signs of disruption. Detailed chemical information for these clusters is essential in order to study the timescales and interplay be…