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Ground Validation Experiment and Spectral Detection Capability Evaluation of Mars Mineralogical Spectrometer (MMS) Aboard HX-1 Orbiter
Zhang, Qing; Liu, Bin; Liu, Jianjun +8 more
As a hyperspectral imager aboard the orbiter "HX-1" of China's first Mars mission, the Mars Mineralogical Spectrometer (MMS) is designed with hyperspectral and multispectral operation modes to survey the mineral types and their distribution on the surface of Mars, and to study the overall chemical composition and evolution history of Mars. The mul…
SFR estimations from z = 0 to z = 0.9. A comparison of SFR calibrators for star-forming galaxies
Buat, V.; Boquien, M.; Małek, K. +7 more
Context. The star formation rate (SFR) is a key ingredient for studying the formation and evolution of galaxies. Being able to obtain accurate estimations of the SFR, for a wide range of redshifts, is crucial for building and studying galaxy evolution paths over cosmic time.
Aims: Based on a statistical sample of galaxies, the aim of this pap…
Universal Scaling Laws for Solar and Stellar Atmospheric Heating: Catalog of Power-law Index between Solar Activity Proxies and Various Spectral Irradiances
Notsu, Yuta; Namekata, Kosuke; Toriumi, Shin +1 more
The formation of extremely hot outer atmospheres is one of the most prominent manifestations of magnetic activity common to late-type dwarf stars, including the Sun. It is widely believed that these atmospheric layers, the corona, transition region, and chromosphere, are heated by the dissipation of energy transported upwards from the stellar surf…
Binary open clusters in the Gaia data
Hu, Qingshun; Esamdin, Ali; Song, Fangfang +1 more
Context. Observations indicate that the fraction of potential binary star clusters in the Milky Way is either the same or lower than that of the Magellanic Clouds. The unprecedented precision in the parallax measurements by Gaia has allowed for the discovery of a growing number of new binary open clusters (OCs).
Aims: We aim to survey the can…
COSMOS2020: Manifold learning to estimate physical parameters in large galaxy surveys
Sanders, D. B.; Ilbert, O.; Moneti, A. +16 more
We present a novel method for estimating galaxy physical properties from spectral energy distributions (SEDs) as an alternative to template fitting techniques and based on self-organizing maps (SOMs) to learn the high-dimensional manifold of a photometric galaxy catalog. The method has previously been tested with hydrodynamical simulations in Davi…
Spatially resolved star-formation relations of dense molecular gas in NGC 1068
Colina, L.; García-Burillo, S.; Fuente, A. +5 more
Context. According to the current understanding of star formation (SF), the regulation of this phenomenon in galaxy disks reflects a complex balance between processes that operate in molecular gas on local cloud scales as well as on global disk scales.
Aims: We analyse the influence of the dynamical environment on the SF relations of the dens…
ESPRESSO observations of HE 0107−5240 and other CEMP-no stars with [Fe/H] ≤ -4.5
Rebolo, R.; Zapatero Osorio, M. R.; Allende Prieto, C. +22 more
Context. HE 0107−5240 is a hyper metal-poor star with [Fe/H] = −5.39, one of the lowest-metallicity stars known. Its stellar atmosphere is enhanced in carbon, with [C/Fe] = +4.0, without a detectable presence of neutron-capture elements. Therefore, it belongs to the carbon-enhanced metal-poor (CEMP−no) group, along with the majority of the most me…
Dynamical Mass of the Exoplanet Host Star HR 8799
Bowler, Brendan P.; Sepulveda, Aldo G.
HR 8799 is a young A5/F0 star hosting four directly imaged giant planets at wide separations (~16-78 au), which are undergoing orbital motion and have been continuously monitored with adaptive optics imaging since their discovery over a decade ago. We present a dynamical mass of HR 8799 using 130 epochs of relative astrometry of its planets, which…
Large-amplitude periodic outbursts and long-period variables in the VVV VIRAC2-β data base
Minniti, D.; Bayo, A.; Catelan, M. +13 more
The VISTA Variables in the Via Lactea (VVV) survey obtained near-infrared photometry towards the Galactic bulge and the southern disc plane for a decade (2010-2019). We designed a modified Lomb-Scargle method to search for large-amplitude ($\Delta K_{s, 2-98{{\ \rm per\ cent}}}$ > 1.5 mag) mid to long-term periodic variables (P> 10 d) in the…
Extreme Variation in Star Formation Efficiency across a Compact, Starburst Disk Galaxy
Bolatto, A. D.; Fisher, D. B.; Glazebrook, K. +4 more
We report on the internal distribution of star formation efficiency in IRAS 08339+6517 (hereafter IRAS08), using ~200 pc resolution CO(2 - 1) observations from NOEMA. The molecular gas depletion time changes by 2 orders-of-magnitude from disk-like values in the outer parts to less than 108 yr inside the half-light radius. This translate…