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X-ray polarization observations of IC 4329A with IXPE: Constraining the geometry of X-ray corona
Stalin, C. S.; Pal, Indrani; Chatterjee, Rwitika +1 more
X-ray polarimetry is a powerful tool to probe the geometry of the hot X-ray corona in active galactic nuclei (AGN). Here, we present our results on the characterization of the X-ray polarization of the radio-quiet Seyfert-type AGN IC 4329A at a redshift of
Depletion of 13C in CO in the Atmosphere of Mars Suggested by ExoMars-TGO/NOMAD Observations
Aoki, S.; Vandaele, A. C.; Daerden, F. +19 more
The atmosphere of Mars is mainly composed by carbon dioxide (CO2). It has been predicted that photodissociation of CO2 depletes 13C in carbon monoxide (CO). We present the carbon 13C/12C isotopic ratio in CO at 30-50 km altitude from the analysis of the solar occultation measurements taken by …
The soft X-ray background with Suzaku. II. Supervirial temperature bubbles?
Sato, Kosuke; Yamasaki, Noriko Y.; Matsushita, Kyoko +4 more
Observations of the hot X-ray emitting interstellar medium in the Milky Way are important for studying the stellar feedback and for understanding the formation and evolution of galaxies. We present measurements of the soft X-ray background emission for 130 Suzaku observations at 75° < l < 285° and |b| > 15°. With the standard soft X-ray b…
An HST survey of 33 T8 to Y1 brown dwarfs: NIR photometry and multiplicity of the coldest isolated objects
Anderson, Jay; Bedin, Luigi R.; Allers, Katelyn +5 more
We present results from a Hubble Space Telescope imaging search for low-mass binary and planetary companions to 33 nearby brown dwarfs with spectral types of T8-Y1. Our survey provides new photometric information for these faint systems, from which we obtained model-derived luminosities, masses, and temperatures. Despite achieving a deep sensitivi…
Dynamical detection of a companion driving a spiral arm in a protoplanetary disk
Dong, Ruobing; Ren, Bin B.; Wagner, Kevin +6 more
Radio and near-infrared observations have observed dozens of protoplanetary disks that host spiral arm features. Numerical simulations have shown that companions may excite spiral density waves in protoplanetary disks via companion-disk interaction. However, the lack of direct observational evidence for spiral-driving companions poses challenges t…
Photometric determination of the mass accretion rates of pre-main-sequence stars. VII. The low-density cluster NGC 376 in the Small Magellanic Cloud
Panagia, Nino; De Marchi, Guido; Tsilia, Styliani
Aims: We study the properties of low-mass stars recently formed in the field of the NGC 376 cluster in the Small Magellanic Cloud (SMC).
Methods: Using photometric observations acquired with the Hubble Space Telescope (HST) in the V, I, and Hα bands, we identify 244 candidate pre-main-sequence (PMS) stars showing Hα excess emission at th…
A Three-dimensional Model for the Evolution of Magnetohydrodynamic Turbulence in the Outer Heliosphere
Oughton, Sean; Fichtner, Horst; Kleimann, Jens +1 more
We present a time-dependent, three-dimensional single-fluid model for the transport of magnetohydrodynamic (MHD) turbulence that is self-consistently evolving with a dynamic large-scale solar wind in the outer heliosphere. The emphasis is on the region beyond the termination shock, where the solar wind expands subsonically, as well as sub-Alfvénic…
J-NEP: 60-band photometry and photometric redshifts for the James Webb Space Telescope North Ecliptic Pole Time-Domain Field
Hernández-Monteagudo, C.; Hernán-Caballero, A.; Mendes de Oliveira, C. +28 more
The Javalambre-Physics of the Accelerating Universe Astrophysical Survey (J-PAS) will observe approximately one-third of the northern sky with a set of 56 narrow-band filters using the dedicated 2.55 m Javalambre Survey Telescope (JST) at the Javalambre Astrophysical Observatory. Prior to the installation of the main camera, in order to demonstrat…
The Gaia view of the Cepheus OB2 association
Ábrahám, Péter; Kun, Mária; Szilágyi, Máté +1 more
OB associations, birthplaces of the most luminous stars, are key objects for understanding the formation of high-mass stars and their effects on their environments. The aim of this work is to explore the structure and kinematics of the Cepheus OB2 association and characterize the history of star formation in the region - in particular, the role of…
A Search for Unbound Stellar Companions to Pulsar J1124-5916
Kochanek, C. S.
We searched for and found no higher mass (${\gtrsim}3{\rm M}_\odot$) unbound binary stellar companions to the progenitor of pulsar J1124-5916. There are lower mass candidates, but they all have high probabilities of being false positives. There are no candidates for it now being a fully unbound triple system. Even if one of the lower mass candidat…