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The role of highly vibrationally excited H2 initiating the nitrogen chemistry. Quantum study and 3σ detection of NH emission in the Orion Bar PDR
Goicoechea, Javier R.; Roncero, Octavio
The formation of hydrides by gas-phase reactions between H2 and a heavy element atom is a very selective process. Reactions with ground-state neutral carbon, oxygen, nitrogen, and sulfur atoms are very endoergic and have high energy barriers because the H2 molecule has to be fragmented before a hydride bond is formed. In cold…
Is there a sub-parsec-scale jet base in the nearby dwarf galaxy NGC 4395?
Ho, Luis C.; Paragi, Zsolt; Nyland, Kristina +6 more
NGC 4395 is a dwarf galaxy at a distance of about 4.3 Mpc (scale: ~0.021 pc mas-1). It hosts an intermediate-mass black hole (IMBH) with a mass between ~104 and ~105 solar masses. The early radio observations of NGC 4395 with the very long baseline interferometry (VLBI) network, High Sensitivity Array (HSA), at 1.4…
Measuring chemical abundances in AGN from infrared nebular lines: HII-CHI-MISTRY-IR for AGN
Pérez-Díaz, Borja; Pérez-Montero, Enrique; Fernández-Ontiveros, Juan A. +1 more
Context. Future and ongoing infrared and radio observatories such as JWST, METIS, and ALMA will increase the amount of rest-frame IR spectroscopic data for galaxies by several orders of magnitude. While studies of the chemical composition of the interstellar medium (ISM) based on optical observations have been widely spread over decades for star-f…
Physical properties of the trans-Neptunian object (38628) Huya from a multi-chord stellar occultation
Ofek, E.; Marques Oliveira, J.; Sicardy, B. +85 more
Context. As part of our international program aimed at obtaining accurate physical properties of trans-Neptunian objects (TNOs), we predicted a stellar occultation by the TNO (38628) Huya of the star Gaia DR2 4352760586390566400 (mG = 11.5 mag) on March 18, 2019. After an extensive observational campaign geared at obtaining the astromet…
Detectability of Rotational Modulation in Kepler Sun-like Stars as a Function of Age
Masuda, Kento
We examine how the fraction f of stars for which rotational modulation has been detected in Kepler light curves depends on the stellar mass M ⋆ and age t ⋆. Our sample consists of ≈850 FGK stars hosting transiting planet candidates detected from the prime Kepler mission. For these stars, atmospheric parameters have been deriv…
Phobos and Deimos surface composition: search for spectroscopic analogues
Barucci, M. A.; Fornasier, S.; Matsuoka, M. +6 more
Phobos and Deimos, the two satellites of Mars, were largely studied in the past using ground-based telescope and spacecraft data, although most of the data were obtained by opportunity observations performed by Mars dedicated orbiters. Despite the data available so far, the main composition of the two moons is not yet fully understood. The possibl…
Measuring the Orbits of the Arches and Quintuplet Clusters Using HST and Gaia: Exploring Scenarios for Star Formation near the Galactic Center
Lu, Jessica R.; Anderson, Jay; Morris, Mark R. +4 more
We present new absolute proper-motion measurements for the Arches and Quintuplet clusters, two young massive star clusters near the Galactic center. Using multiepoch HST observations, we construct proper-motion catalogs for the Arches (~35,000 stars) and Quintuplet (~40,000 stars) fields in ICRF coordinates established using stars in common with t…
Extreme-Ultraviolet Wave and Accompanying Loop Oscillations
Awasthi, Arun Kumar; Schmieder, Brigitte; Joshi, Reetika +2 more
We present the observations of an extreme-ultraviolet (EUV) wave, which originated from the active region (AR) NOAA 12887 on 28 October 2021, and its impact on neighboring loops. The event was observed by the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory (SDO) satellite at various wavebands and by the Solar TErrestrial…
Protracted Hydrogeological Activity in Arabia Terra, Mars: Evidence From the Structure and Mineralogy of the Layered Deposits of Becquerel Crater
Rossi, A. P.; Pondrelli, M.; Schmidt, G. +3 more
The formation of layered mounds on Mars remains a major topic of debate, with the relationship between their deposition and chemical alteration a major aspect still to be constrained. The association these deposits have with hydrated minerals indicates aqueous processes were active in their past, however the extent and duration of this aqueous per…
Stellar Chromospheric Activity Database of Solar-like Stars Based on the LAMOST Low-Resolution Spectroscopic Survey
Zhang, Jun; Zhang, Haotong; Luo, Ali +3 more
A stellar chromospheric activity database of solar-like stars is constructed based on the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Low-Resolution Spectroscopic Survey. The database contains spectral bandpass fluxes and indexes of Ca II H and K lines derived from 1,330,654 high-quality LRS spectra of solar-like stars. We m…