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New Horizons Observations of the Cosmic Optical Background
Buratti, Bonnie J.; Singer, Kelsi N.; McKinnon, William B. +27 more
We used existing data from the New Horizons Long-range Reconnaissance Imager (LORRI) to measure the optical-band (0.4 ≲ λ ≲ 0.9 µm) sky brightness within seven high-Galactic latitude fields. The average raw level measured while New Horizons was 42-45 au from the Sun is 33.2 ± 0.5 nW m-2 sr-1. This is ∼10× as dark as the…
CO Multi-line Imaging of Nearby Galaxies (COMING). IX. 12CO(J = 2-1)/12CO(J = 1-0) line ratio on kiloparsec scales
Kobayashi, Masato I. N.; Kuno, Nario; Miyamoto, Yusuke +8 more
While molecular gas mass is usually derived from 12CO(J = 1-0)—the most fundamental line for exploring molecular gas—it is often derived from 12CO(J = 2-1) assuming a constant 12CO(J = 2-1) $/$ 12CO(J = 1-0) line ratio (R2/1). We present variations of R2/1 and effects of the assumpt…
The Parallax Zero-point of Gaia Early Data Release 3 from LAMOST Primary Red Clump Stars
Huang, Yang; Beers, Timothy C.; Yuan, Haibo +1 more
We present an independent examination of the parallax zero-point of the Third Gaia Early Data Release (hereafter EDR3), using the LAMOST primary red clump (PRC) stellar sample. A median parallax offset of around 26 µas, slightly larger than that found by examination of distant quasars, is found for both the five- and six-parameter solutions …
The TW Hya Rosetta Stone Project. III. Resolving the Gaseous Thermal Profile of the Disk
Zhang, Ke; Öberg, Karin; Walsh, Catherine +16 more
The thermal structure of protoplanetary disks is a fundamental characteristic of the system that has wide-reaching effects on disk evolution and planet formation. In this study, we constrain the 2D thermal structure of the protoplanetary disk TW Hya structure utilizing images of seven CO lines. This includes new ALMA observations of 12C…
The Magnetic Origin of Solar Campfires
Tiwari, Sanjiv K.; Cheung, Mark C. M.; Berghmans, David +4 more
Solar campfires are fine-scale heating events, recently observed by Extreme Ultraviolet Imager (EUI) on board Solar Orbiter. Here we use EUI 174 Å images, together with EUV images from Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA), and line-of-sight magnetograms from SDO/Helioseismic and Magnetic Imager (HMI) to investigate t…
The luminous red nova AT 2018bwo in NGC 45 and its binary yellow supergiant progenitor
Gehrz, Robert D.; Bond, Howard E.; Burdge, Kevin B. +12 more
Luminous red novae (LRNe) are astrophysical transients associated with the partial ejection of a binary system's common envelope shortly before its merger. Here we present the results of our photometric and spectroscopic follow-up campaign of AT 2018bwo (DLT 18x), a LRN discovered in NGC 45, and investigate its progenitor system using binary stell…
First Fermi-LAT Solar Flare Catalog
Troja, E.; Orlando, E.; Ajello, M. +82 more
We present the first Fermi-Large Area Telescope (LAT) solar flare catalog covering the 24th solar cycle. This catalog contains 45 Fermi-LAT solar flares (FLSFs) with emission in the γ-ray energy band (30 MeV-10 GeV) detected with a significance of ≥5σ over the years 2010-2018. A subsample containing 37 of these flares exhibits delayed emission bey…
3D dynamics of the Orion cloud complex. Discovery of coherent radial gas motions at the 100-pc scale
Meingast, Stefan; Alves, João; Großschedl, Josefa E. +1 more
We present the first study of the three-dimensional (3D) dynamics of the gas in the entire southern Orion cloud complex. We used the parallaxes and proper motions of young stellar objects (YSOs) from Gaia DR2 as a proxy for gas distance and proper motion, and the gas radial velocities from archival CO data, to compute the space motions of the diff…
Comprehensive Broadband X-Ray and Multiwavelength Study of Active Galactic Nuclei in 57 Local Luminous and Ultraluminous Infrared Galaxies Observed with NuSTAR and/or Swift/BAT
Imanishi, Masatoshi; Tanimoto, Atsushi; Ueda, Yoshihiro +4 more
We perform a systematic X-ray spectroscopic analysis of 57 local luminous and ultraluminous infrared galaxy systems (containing 84 individual galaxies) observed with the Nuclear Spectroscopic Telescope Array and/or Swift/BAT. Combining soft X-ray data obtained with Chandra, XMM-Newton, Suzaku, and/or Swift/XRT, we identify 40 hard (>10 keV) X-r…
Evidence of a Dwarf Galaxy Stream Populating the Inner Milky Way Halo
Malhan, Khyati; Ibata, Rodrigo A.; Martin, Nicolas F. +3 more
Stellar streams produced from dwarf galaxies provide direct evidence of the hierarchical formation of the Milky Way. Here, we present the first comprehensive study of the LMS-1 stellar stream, that we detect by searching for wide streams in the Gaia EDR3 data set using the STREAMFINDER algorithm. This stream was recently discovered by Yuan et al. …