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Origin and trends in NH4+ observed in the coma of 67P
Altwegg, K.; Goetz, C.; Rubin, M. +6 more
The European Space Agency/Rosetta mission escorted comet 67P/Churyumov-Gerasimenko and witnessed the evolution of its coma from low activity (~2.5-3.8 au) to rich ion-neutral chemistry (~1.2-2.0 au). We present an analysis of the ion composition in the coma, focusing on the presence of protonated high proton affinity (HPA) species, in particular $…
Decomposing the Spectrum of Ultraluminous X-Ray Pulsar NGC 300 ULX-1
Enoto, Teruaki; Noda, Hirofumi; Kobayashi, Shogo B. +3 more
A phase-resolved analysis on the X-ray spectrum of ultraluminous X-ray pulsar (ULXP) NGC 300 ULX-1 is performed with data taken with XMM-Newton and NuSTAR on 2016 December 16. In addition to the classical phase-restricting analysis, a method developed in active galactic nuclei studies is newly employed for ULXP. It has revealed that the pulsation …
Updated Radiative Transfer Model for Titan in the Near-infrared Wavelength Range: Validation against Huygens Atmospheric and Surface Measurements and Application to the Cassini/VIMS Observations of the Dragonfly Landing Area
Le Mouélic, S.; Cornet, T.; Rodriguez, S. +13 more
We present an analysis of Titan data acquired by the Cassini Visual and Infrared Mapping Spectrometer (VIMS) at the landing site of the Dragonfly mission, using a new version of our radiative transfer model for Titan, with significant updates for the spectroscopic parameters of atmospheric gases and photochemical aerosols. Our updated radiative tr…
The Association of Cusp-Aligned Arcs With Plasma in the Magnetotail Implies a Closed Magnetosphere
Dandouras, I.; Anderson, B. J.; Fazakerley, A. N. +7 more
We investigate a 15-day period in October 2011. Auroral observations by the Special Sensor Ultraviolet Spectrographic Imager instrument onboard the Defense Meteorological Satellite Program F16, F17, and F18 spacecraft indicate that the polar regions were covered by weak cusp-aligned arc (CAA) emissions whenever the interplanetary magnetic field (I…
Constraint on the Accretion of NGC 6946 X-1 Using Broadband X-Ray Data
Rana, Vikram; Ghosh, Tanuman
We analyze broadband X-ray data of NGC 6946 X-1 and probe plausible accretion scenarios in this ULX. NGC 6946 X-1 is a persistent soft source with broadband continuum spectra described by two thermal disk components. The cool accretion disk temperature T cool ~ 0.2 keV and the presence of a ~0.9 keV emission/absorption broad feature sug…
Sodium Abundances in Very Metal-poor Stars
Shi, Jianrong; Zhao, Gang; Li, Haining +9 more
Chemical composition of very metal-poor (VMP) stars can provide observational constraints on current models of nucleosynthesis and the chemical evolution of the Galaxy. It has been found that the scatter of [Na/Fe] versus [Fe/H] in VMP stars is very large in contrast with most other elements. Moreover, a negative slope in [Na/Fe] versus [Fe/H] was…
Integral Field Spectroscopy of the cometary starburst galaxy NGC 4861
Roche, Nathan; Sánchez, Sebastian F.; Vílchez, José M. +4 more
Using the PMAS Integral Field Unit on the Calar Alto 3.5 m telescope, we observed the southern component (Markarian 59) of the 'cometary' starburst galaxy NGC 4861. Mrk 59 is centred on a giant nebula and concentration of stars 1 kpc in diameter. Strong $\rm H\,\alpha$ emission points to a star-formation rate (SFR) at least 0.47 $\rm M_{\odot }\, …
Properties of Flare Events on M Stars from LAMOST Spectral Survey Based on Kepler and TESS Light Curves
Han, Xianming L.; Misra, Prabhakar; Long, Liu +7 more
A catalog of M stars has been published from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope data release 7 (LAMOST DR7). We cross-matched the LAMOST M catalog with Kepler, Kepler 2 (K2) and Transiting Exoplanet Survey Satellite (TESS) surveys. We obtained the light curves from the Kepler and TESS surveys. We detected 20,047 flare ev…
Astrometric VLBI observations of H2O masers in an extreme OH/IR star candidate NSV 17351
Kurayama, Tomoharu; Honma, Mareki; Orosz, Gabor +14 more
The results of astrometric very long baseline interferometry (VLBI) observations toward an extreme OH/IR star candidate NSV 17351 are presented. Using the VERA (VLBI Exploration of Radio Astrometry) VLBI array , we observed 22 GHz H2O masers of NSV 17351 and derived an annual parallax of 0.247 ± 0.035 mas, which corresponds to a distanc…
The Long-term Monitoring Results of Insight-HXMT in the First 4 yr Galactic Plane Scanning Survey
Zhang, Shuang-Nan; Liu, Yuan; Wang, Chen +7 more
The first X-ray source catalog of the Insight-HXMT Galactic Plane (∣b∣ < 10°) Scanning Survey (GPSS) is presented based on the data accumulated from 2017 June to 2021 August. The 4 yr limit sensitivities at main energy bands can reach 8.2 × 10-12 erg s-1 cm2 (2-6 keV), 4.21 × 10-11 erg s-1 …