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NGC 2022, a case study of a multiple-shell planetary nebula
Chu, Y. -H.; Guerrero, M. A.; Toalá, J. A. +7 more
We present a detailed study of the physical properties, history of mass loss, and chemical abundances of the planetary nebula NGC 2022. New imaging observations obtained with the OAJ/JAST80 and NOT/ALFOSC confirm the presence of a faint ~88 arcsec halo surrounding a double-layered elliptical structure that consists of a bright 21.4 × 16.7 arcsec i…
Searching for single-frame rapid X-ray transients detected with Chandra
Feng, Hua; Zhang, Yijia
We propose a new method to identify rapid X-ray transients observed with focusing telescopes. They could be statistically significant if three or more photons are detected with Chandra in a single CCD frame within a point-spread-function region out of quiescent background. In the Chandra archive, 11 such events are discovered from regions without …
The Spitzer-HETDEX Exploratory Large-Area Survey. IV. Model-based Multiwavelength Photometric Catalog
Papovich, Casey; Finkelstein, Steven L.; Chworowsky, Katherine +11 more
We present a 0.3-4.5 µm 16-band photometric catalog for the Spitzer/HETDEX Exploratory Large-Area (SHELA) survey. SHELA covers an ~27 deg2 field within the footprint of the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). Here we present new DECam imaging and an rizK s band-selected catalog of four million sour…
A Data-constrained Scheme for the Reconstruction of Solar Wind Parameters in the Inner Heliosphere
Feng, Xueshang; Zhang, Man; Liu, Xiaojing +1 more
With the development of our industrial society, the reconstruction of solar wind parameters in the inner heliosphere becomes very important to understanding the interplanetary propagation of various types of space weather disturbance. However, the situ observations of solar wind parameters are only applicable to several points where spacecraft are…
Mid-Infrared Spectroscopy of Feldspars From the Bühl Basalt (Northern Hesse, Germany) Formed Under Reducing Conditions as Terrestrial Analogue of Mercury for MERTIS
Hiesinger, Harald; Helbert, Jörn; Weber, Iris +6 more
The MErcury Radiometer and Thermal Infrared Spectrometer instrument onboard the BepiColombo spacecraft is designed to investigate Mercury's surface in the mid-infrared (mid-IR). Based on MESSENGER data and modeling, Mercury is thought to be evolved under highly reducing conditions (e.g., McCubbin et al., 2017,
CO, H2O, and CH4 in the dusty atmosphere of a ≲5 Myr-old exoplanet
Gaidos, Eric; Hirano, Teruyuki
Very young massive planets are sufficiently luminous by their internal heat of formation to permit detailed studies, including spectroscopy of their atmospheres with large telescopes at sufficient resolution (λ/Δλ ≳ 1000) to identify major constituents to inform models of planet formation and early evolution. We obtained 1-2.4 µm (YJHK) spec…
Cloud chemistry on Venus: Sulfuric acid reactions and supercooling in Venus liquid cloud droplets
Baines, K. H.; Delitsky, M. L.
Cloud particles on Venus consist of liquid droplets of aqueous sulfuric acid solutions (H2SO4/H2O) that are the site of chemical reactions arising from uptake (absorption) of surrounding gas molecules into the droplets and subsequent solution chemistry. The Henry's Law constant, H*, for HCl in sulfuric acid in wate…
Galaxy And Mass Assembly (GAMA): the dependence of star formation on surface brightness in low-redshift galaxies
Bremer, M. N.; Holwerda, B. W.; De Propris, R. +5 more
The star-formation rate in galaxies is well known to correlate with stellar mass (the 'star-forming main sequence'). Here, we extend this further to explore any additional dependence on galaxy surface brightness, a proxy for stellar mass surface density. We use a large sample of low-redshift (z ≤ 0.08) galaxies from the Galaxy And Mass Assembly su…
Exploring the Emission Mechanisms of Mrk 180 with Long-term X-Ray and γ-Ray Data
Gupta, Nayantara; Mondal, Sandeep Kumar; Das, Saikat
Markarian (Mrk) 180 is a BL Lacertae object located at a redshift of 0.045 and is a potential candidate for high-energy cosmic-ray acceleration. We have analyzed the Fermi Large Area Telescope (Fermi-LAT) γ-ray data of Mrk 180 collected over a period of 12.8 yr and found no significant enhancement in the flux from the long-term γ-ray light curve. …
3D stellar motion in the axisymmetric Galactic potential and the e-z resonances
Barros, Douglas A.; Michtchenko, Tatiana A.
Context. The full phase-space information on the kinematics of a huge number of stars provided by Gaia Data Release 3 increases the demand for a better understanding of the 3D stellar dynamics.
Aims: In this paper, we investigate the possible regimes of motion of stars in the axisymmetric approximation of the Galactic potential, applying a 3D…