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The Mid-infrared Molecular Inventory toward Orion IRc2
Drozdovskaya, Maria N.; Herbst, Eric; Acharyya, Kinsuk +8 more
We present the first high spectral resolution mid-infrared survey in the Orion BN/KL region, covering 7.2–28.3 µm. With SOFIA/EXES, we target the enigmatic source Orion IRc2. While this is in the most prolifically studied massive star-forming region, longer wavelengths and molecular emission lines dominated previous spectral surveys. The mid…
Survey of Bare Active Galactic Nuclei in the Local Universe (z < 0.2). I. On the Origin of Soft Excess
Safi-Harb, Samar; Chang, Hsiang-Kuang; Naik, Sachindra +5 more
We analyze a sample of 21 "bare" Seyfert 1 active galactic nuclei, a subclass of Seyfert 1 galaxies, with intrinsic absorption N H ~ 1020 cm-2, in the local Universe (z < 0.2) using XMM-Newton and Swift/XRT observations. The luminosities of the primary continuum, the X-ray emission in the 3-10 keV energy range, …
Signatures of dynamic fibrils at the coronal base: Observations from Solar Orbiter/EUI
Teriaca, Luca; Solanki, Sami K.; Liu, Wei +20 more
The solar chromosphere hosts a wide variety of transients, including dynamic fibrils (DFs) that are characterised as elongated, jet-like features seen in active regions, often through Hα diagnostics. So far, these features have been difficult to identify in coronal images, primarily due to their small size and the lower spatial resolution of the c…
Investigating Gaia EDR3 parallax systematics using asteroseismology of Cool Giant Stars observed by Kepler, K2, and TESS. I. Asteroseismic distances to 12 500 red-giant stars
Khan, S.; Cantat-Gaudin, T.; Clementini, G. +10 more
Gaia EDR3 has provided unprecedented data that has generated a great deal of interest in the astrophysical community, even though systematics affect the reported parallaxes at the level of ∼10 µas. Independent distance measurements are available from asteroseismology of red-giant stars with measurable parallaxes, whose magnitude and colour r…
Parker Solar Probe Encounters the Leg of a Coronal Mass Ejection at 14 Solar Radii
Mitchell, D. G.; McComas, D. J.; Bale, S. D. +14 more
We use Parker Solar Probe (PSP) observations to report the first direct measurements of the particle and field environments while crossing the leg of a coronal mass ejection (CME) very close to the Sun (~14 Rs). An analysis that combines imaging from 1 au and PSP with a CME model, predicts an encounter time and duration that correspond to an unusu…
The hunt for formamide in interstellar ices. A toolkit of laboratory infrared spectra in astronomically relevant ice mixtures and comparisons to ISO, Spitzer, and JWST observations
van Dishoeck, E. F.; Rocha, W. R. M.; Slavicinska, K. +3 more
Context. Although solid-state pathways are expected to dominate the formation mechanisms of many complex organic molecules (COMs), very few COMs have been securely identified in interstellar ices, in stark contrast with the many COM detections in the gas phase. The launch of the James Webb Space Telescope (JWST) and its increase in sensitivity and…
Spectroscopic survey of faint planetary-nebula nuclei - I. Six new 'O VI' central stars
Bond, Howard E.; Zeimann, Gregory R.; Werner, Klaus +1 more
We report initial results from an ongoing spectroscopic survey of central stars of faint planetary nebulae (PNe), obtained with the Low-Resolution Spectrograph on the Hobby-Eberly Telescope. The six PN nuclei (PNNi) discussed here all have strong emission at the O VI 3811-3834 Å doublet, indicative of very high temperatures. Five of them - the nuc…
Astronomical CH3+ rovibrational assignments. A combined theoretical and experimental study validating observational findings in the d203-506 UV-irradiated protoplanetary disk
Martin-Drumel, Marie-Aline; Van De Putte, Dries; Habart, Emilie +25 more
Context. The methyl cation (CH3+) has recently been discovered in the interstellar medium through the detection of 7 µm (1400 cm−1) features toward the d203-506 protoplanetary disk by the JWST. Line-by-line spectroscopic assignments of these features, however, were unsuccessful due to complex intramolecular p…
Applying Magnetic Curvature to MMS Data to Identify Thin Current Sheets Relative to Tail Reconnection
Farrugia, C. J.; Torbert, R. B.; Rogers, A. J. +1 more
Thin current sheets (TCSs) have been postulated to be a necessary precondition for reconnection onset. Magnetic reconnection X-lines in the magnetotail have been observed to be more common duskward of midnight. We take advantage of the MMS tetrahedral formation during the 2017-2020 MMS tail seasons to calculate the thickness of the cross-tail neut…
The Roles of Morphology and Environment on the Star Formation Rate-Stellar Mass Relation in COSMOS from 0 < z < 3.5
Kartaltepe, Jeyhan S.; Koekemoer, Anton M.; Peng, Ying-jie +6 more
We investigate the relationship between environment, morphology, and the star formation rate (SFR)-stellar mass relation derived from a sample of star-forming (SF) galaxies (commonly referred to as the "star formation main sequence", SFMS) in the COSMOS field from 0 < z < 3.5. We constructed and fit the far-UV-far-IR spectral energy distribu…