Search Publications
ALMA Reveals the Molecular Gas Properties of Five Star-forming Galaxies across the Main Sequence at 3
Schinnerer, Eva; Tasca, Lidia; Liu, Daizhong +17 more
We present the detection of CO (5-4) with signal-to-noise ratio (S/N) > 7-13 and a lower CO transition with S/N > 3 (CO (4-3) for four galaxies, and CO (3-2) for one) with the Atacama Large Millimeter/submillimeter Array in bands 3 and 4 in five main-sequence (MS) star-forming galaxies with stellar masses (3-6) × 1010M⊙…
Orbital Modulation of Gamma Rays from PSR J2339-0533
An, Hongjun; Kerr, Matthew; Fermi-LAT Collaboration +1 more
We report on orbital modulation of the 100-600 MeV gamma-ray emission of the PB = 4.6 hr millisecond pulsar binary PSR J2339-0533 using 11 yr of Fermi Large Area Telescope data. The modulation has high significance (chance probability p ≈ 10-7), is approximately sinusoidal, peaks near pulsar superior conjunction, and is detec…
Flare Energy Release at the Magnetic Field Polarity Inversion Line during the M1.2 Solar Flare of 2015 March 15. II. Investigation of Photospheric Electric Current and Magnetic Field Variations Using HMI 135 s Vector Magnetograms
Zimovets, I. V.; Sharykin, I. N.; Myshyakov, I. I.
This work is a continuation of Paper I and is devoted to the analysis of nonthermal electron dynamics and plasma heating in the confined M1.2 class solar flare SOL2015-03-15T22:43, revealing energy release in the highly sheared interacting magnetic loops in the low corona, above the polarity inversion line (PIL). The aim of the present work is to …
Characterization of the Particle-induced Background of XMM-Newton EPIC-pn: Short- and Long-term Variability
Miller, Eric D.; Kraft, Ralph; Gastaldello, Fabio +16 more
The particle-induced background of X-ray observatories is produced by galactic cosmic ray (GCR) primary protons, electrons, and He ions. Events due to direct interaction with the detector are usually removed by onboard processing. The interactions of these primary particles with the detector environment produce secondary particles that mimic X-ray…
HST Survey of the Orion Nebula Cluster in the H2O 1.4 µm Absorption Band. II. The Substellar IMF Down to Planetary Masses
Gennaro, Mario; Robberto, Massimo
We utilize the ability of the Hubble Space Telescope to probe near-infrared water absorption present in the atmosphere of low-mass stars and brown-dwarf and planetary-mass objects to create a pure sample of Orion Nebula Cluster (ONC) members, not affected by contamination from background stars and galaxies that lack water absorption. Thanks to the…
OGLE-ing the Magellanic System: RR Lyrae Stars in the Bridge
Udalski, Andrzej; Mróz, Przemek; Szymański, Michał K. +12 more
We use the extended and updated Optical Gravitational Lensing Experiment (OGLE) Collection of Variable Stars to thoroughly analyze the distribution of RR Lyrae stars in the Magellanic Bridge. We use photometric metallicities to derive the absolute Wesenheit magnitude and individual distance of each RR Lyrae star. We confirm results from our earlie…
The Slow Heartbeats of an Ultraluminous X-Ray Source in NGC 3621
Salvaterra, R.; Tiengo, A.; Marelli, M. +6 more
We report on the results of X-ray observations of 4XMM J111816.0-324910, a transient ultraluminous X-ray source located in the galaxy NGC 3621. This system is characterized by a transient nature and marked variability with a characteristic timescale of ≈3500 s, in contract with other ultraluminous X-ray sources, which in the vast majority show lim…
The Metallicity Gradient and Complex Formation History of the Outermost Halo of the Milky Way
Yoon, Jinmi; Beers, Timothy C.; Placco, Vinicius M. +1 more
We present an examination of the metallicity distribution function of the outermost stellar halo of the Galaxy based on an analysis of both local (within 4 kpc of the Sun, ∼16,500 stars) and non-local (∼21,700 stars) samples. These samples were compiled using spectroscopic metallicities from the Sloan Digital Sky Survey and photometric metalliciti…
The SOFIA Massive (SOMA) Star Formation Survey. III. From Intermediate- to High-mass Protostars
Yang, Yao-Lun; Tanaka, Kei E. I.; Zhang, Yichen +9 more
We present $\sim 10\mbox{--}40\,\mu {\rm{m}}$ SOFIA-FORCAST images of 14 intermediate-mass protostar candidates as part of the SOFIA Massive (SOMA) Star Formation Survey. We build spectral energy distributions, also using archival Spitzer, Herschel, and IRAS data. We then fit the spectral energy distributions with radiative transfer models of Zhan…
Heating at the Remote Footpoints as a Brake on Jet Flows along Loops in the Solar Atmosphere
Fu, Hui; Li, Bo; Xia, Lidong +3 more
We report on observations of a solar jet propagating along coronal loops taken by the Solar Dynamics Observatory, the Interface Region Imaging Spectrograph, and the 1 m New Vacuum Solar Telescope. The ejecta of the jet consist of multithermal components and propagate with a speed greater than 100 km s-1. Brightenings are found in the re…