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Kinematics and Feedback in H II Regions in the Dwarf Starburst Galaxy IC 10
Do, Tuan; Sandstrom, Karin; Armus, Lee +8 more
We present a survey of the central region of the nearest starburst galaxy, IC 10, using the W. M. Keck Observatory Keck Cosmic Web Imager (KCWI) at high spectral and spatial resolution. We map the central starburst of IC 10 to sample the kinematic and ionization properties of the individual star-forming regions. Using the low spectral resolution m…
Evolution of an Emerging Anti-Hale Region and its Associated Eruptive Solar Flares in NOAA AR 12882
Xu, Zhe; Xue, Zhike; Yan, Xiaoli +3 more
Solar active regions that violate the Hale-Nicholson rule are rare, but once formed, they tend to be flare-productive. In this letter, we investigated the evolution of an anti-Hale region newly emerging from the active region AR 12882 with a regular Hale distribution. The entire active region became very active, producing two eruptive flares withi…
Magnetic field structure of OMC-3 in the far infrared revealed by SOFIA/HAWC+
Wolf, S.; Zielinski, N.
We report the SOFIA/HAWC+ band D (154 µm) and E (214 µm) polarimetric observations of the filamentary structure OMC-3 that is part of the Orion molecular cloud. The polarization pattern is uniform for both bands and parallel to the filament structure. The polarization degree decreases toward regions with high intensity for both bands, …
Disks in Nearby Young Stellar Associations Found Via Virtual Reality
Debes, John H.; Kuchner, Marc J.; Gagné, Jonathan +25 more
The Disk Detective citizen science project recently released a new catalog of disk candidates found by visual inspection of images from NASA's Wide-field Infrared Survey Explorer mission and other surveys. We applied this new catalog of well-vetted disk candidates to search for new members of nearby young stellar associations (YSAs) using a novel …
Light Deflection under the Gravitational Field of Jupiter-Testing General Relativity
Xu, Ye; Hao, Chaojie; Li, Yingjie +6 more
We measured the relative positions between two pairs of compact extragalactic sources (CESs), J1925-2219 and J1923-2104 (C1-C2) and J1925-2219 and J1928-2035 (C1-C3), on 2020 October 23-25 and 2021 February 5 (totaling four epochs), respectively, using the Very Long Baseline Array at 15 GHz. Accounting for the deflection angle dominated by Jupiter…
Mass and Age Determination of the LAMOST Data with Different Machine-learning Methods
Ting, Yuan-Sen; Deng, Li-Cai; Wang, Hai-Feng +3 more
We present a catalog of 948,216 stars with mass labels and a catalog of 163,105 red clump (RC) stars with mass and age labels simultaneously. The training data set is crossmatched from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope DR5, and high-resolution asteroseismology data, mass, and age are predicted by the random forest (RF) …
Milliarcsecond Astrometry for the Galilean Moons Using Stellar Occultations
Aoki, S.; Smith, M.; Carlson, R. W. +40 more
A stellar occultation occurs when a Solar System object passes in front of a star for an observer. This technique allows the sizes and shapes of the occulting body to be determined with kilometer precision. In addition, this technique constrains the occulting body's positions, albedos, densities, and so on. In the context of the Galilean moons, th…
Quantifying the cool ISM in radio AGNs: evidence for late-time retriggering by galaxy mergers and interactions
Daddi, E.; Morganti, R.; Tadhunter, C. N. +5 more
We use deep Herschel observations of the complete 2Jy sample of powerful radio active galactic nuclei (AGNs) in the local Universe (0.05 < z < 0.7) to probe their cool interstellar medium (ISM) contents and star-forming properties, comparing them against other samples of nearby luminous AGNs and quiescent galaxies. This allows us to investig…
Kepler and TESS Observations of PG 1159-035
Oliveira da Rosa, Gabriela; Kepler, S. O.; Córsico, Alejandro H. +11 more
PG 1159-035 is the prototype of the PG 1159 hot (pre-)white dwarf pulsators. This important object was observed during the Kepler satellite K2 mission for 69 days in 59 s cadence mode and by the TESS satellite for 25 days in 20 s cadence mode. We present a detailed asteroseismic analysis of those data. We identify a total of 107 frequencies repres…
Using 3D and 2D analysis for analyzing large-scale asymmetry in galaxy spin directions
Shamir, Lior
The nature of galaxy spin is still not fully known. Iye, Yagi, and Fukumoto (2021, AJ, 907, 123) applied a 3D analysis to a dataset of bright SDSS galaxies that was used in the past for photometric analysis. They showed that the distribution of spin directions of spiral galaxies is random, providing a dipole axis with low statistical significance …