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Herschel Investigation of Cores and Filamentary Structures in the Perseus Molecular Cloud
Zhang, Guo-Yin; Zhang, Chang; Li, Jin-Zeng +1 more
Cores and filamentary structures are the prime birthplaces of stars, and play key roles in the process of star formation. Latest advances in the methods of multi-scale source and filament extraction, and in making high-resolution column density map from Herschel multi-wavelength observations enable us to detect the filamentary network structures i…
An Efficient High-Resolution Global-Local Network to Detect Lunar Features for Space Energy Discovery
Liu, Lei; Jia, Yutong; Peng, Siqing +2 more
Lunar craters and rilles are significant topographic features on the lunar surface that will play an essential role in future research on space energy resources and geological evolution. However, previous studies have shown low efficiency in detecting lunar impact craters and poor accuracy in detecting lunar rilles. There is no complete automated …
Direct Evidence of Magnetic Reconnection Onset via the Tearing Instability
Verscharen, Daniel; Walsh, Andrew P.; Forsyth, Colin +4 more
Magnetic reconnection is a sporadic process responsible for energy release in space and laboratory plasmas. It is believed that the tearing mode instability may be responsible for the onset of reconnection in the magnetotail. However, due to its elusive nature, there is an absence of in-situ observations of the tearing instability prior to magneti…
The ALPINE-ALMA [C II] Survey: The Infrared-Radio Correlation and Active Galactic Nucleus Fraction of Star-forming Galaxies at z 4.4-5.9
Shen, Lu; Koekemoer, Anton M.; Jones, Gareth C. +26 more
We present the radio properties of 66 spectroscopically confirmed normal star-forming galaxies (SFGs) at 4.4 < z < 5.9 in the COSMOS field that were [C II]-detected in the Atacama Large Millimeter/submillimeter Array Large Program to INvestigate [C II] at Early times (ALPINE). We separate these galaxies ("C II-detected-all") into lower-redsh…
Pre- and Post-entry, Descent and Landing Assessment of the Martian Atmosphere for the Mars 2020 Rover
Kleinböhl, Armin; Mischna, Michael A.; Lewis, Stephen R. +10 more
This review provides an analysis of activities undertaken by the Mars 2020 Council of Atmospheres (CoA) in support of the entry, descent, and landing (EDL) of the Mars 2020 rover Perseverance in Jezero crater, Mars. The activities of the CoA were designed to evaluate the safety of early-stage landing site candidates and, later, to constrain the ra…
The Mars Oxygen Visible Dayglow: A Martian Year of NOMAD/UVIS Observations
Aoki, S.; Vandaele, A. C.; Daerden, F. +12 more
The Ultraviolet and Visible Spectrometer Ultraviolet (UVIS UV) and Visible Spectrometer channel of the Nadir and Occultation for MArs Discovery spectrometer aboard the ExoMars Trace Gas Orbiter has made limb observations of the Martian dayglow during more than a Martian year. Two pointing modes have been applied: (a) In the inertial mode, the spec…
Discovery of a pulse-phase-transient cyclotron line in the X-ray pulsar Swift J1808.4-1754 and identification of an optical companion
Tsygankov, Sergey S.; Lutovinov, Alexander A.; Molkov, Sergey V. +3 more
In this work, the temporal and spectral properties of the poorly studied X-ray pulsar Swift J1808.4-1754 were investigated in the 0.8-79 keV energy range based on the data from the NuSTAR and Swift observatories collected during the 2014 outburst. Strong pulsations with a period of 909.73 ± 0.03 s were detected in the source light curve, with the …
Spectroscopic Study of Four Metal-poor Carbon Stars from the Hamburg/ESO Survey: On Confirming the Low-mass Nature of Their Companions
Shejeelammal, J.; Goswami, Aruna
Elemental abundances of extrinsic carbon stars provide insight into the poorly understood origin and evolution of elements in the early Galaxy. In this work, we present the results of a detailed spectroscopic analysis of four potential carbon star candidates from the Hamburg/ESO Survey (HES): HE 0457-1805, HE 0920-0506, HE 1241-0337, and HE 1327-2…
Predicting HCN, HCO+, multi-transition CO, and dust emission of star-forming galaxies. Constraining the properties of resolved gas and dust disks of local spiral galaxies
Braine, J.; Bigiel, F.; Gratier, P. +2 more
The interstellar medium is a turbulent, multiphase, and multi-scale medium that follows scaling relations that link the surface density, volume density, and velocity dispersion with the cloud size. Galactic clouds range from below 1 pc to about 100 pc in size. Extragalactic clouds appear to follow the same range, although they are only now becomin…
An Integrative Analysis of the Rich Planetary System of the Nearby Star e Eridani: Ideal Targets for Exoplanet Imaging and Biosignature Searches
Apai, Dániel; Dietrich, Jamie; Basant, Ritvik
e Eridani, the fifth-closest Sun-like star, hosts at least three planets and could possibly harbor more. However, the veracity of the planet candidates in the system and its full planetary architecture remain unknown. Here we analyze the planetary architecture of e Eridani via DYNAMITE, a method providing an integrative assessment of the system ar…