Search Publications
The Properties of Planck Galactic Cold Clumps in the L1495 Dark Cloud
Sanhueza, Patricio; Soam, Archana; Di Francesco, James +19 more
Planck Galactic Cold Clumps (PGCCs) possibly represent the early stages of star formation. To understand better the properties of PGCCs, we studied 16 PGCCs in the L1495 cloud with molecular lines and continuum data from Herschel, JCMT/SCUBA-2, and the PMO 13.7 m telescope. Thirty dense cores were identified in 16 PGCCs from 2D Gaussian fitting. T…
A Multi-instrument and Multi-wavelength High Angular Resolution Study of MWC 614: Quantum Heated Particles Inside the Disk Cavity
Monnier, John D.; Kraus, Stefan; Hinkley, Sasha +13 more
High angular resolution observations of young stellar objects are required to study the inner astronomical units of protoplanetary disks in which the majority of planets form. As they evolve, gaps open up in the inner disk regions and the disks are fully dispersed within ∼10 Myr. MWC 614 is a pretransitional object with a ∼10 au radius gap. We pre…
Incorporating Uncertainties in Atomic Data into the Analysis of Solar and Stellar Observations: A Case Study in Fe XIII
Del Zanna, Giulio; Warren, Harry P.; van Dyk, David A. +6 more
Information about the physical properties of astrophysical objects cannot be measured directly but is inferred by interpreting spectroscopic observations in the context of atomic physics calculations. Ratios of emission lines, for example, can be used to infer the electron density of the emitting plasma. Similarly, the relative intensities of emis…
Discovery of a New Fundamental Plane Dictating Galaxy Cluster Evolution from Gravitational Lensing
Donahue, Megan; Umetsu, Keiichi; Medezinski, Elinor +5 more
In cold dark-matter (CDM) cosmology, objects in the universe have grown under the effect of gravity of dark matter. The intracluster gas in a galaxy cluster was heated when the dark-matter halo formed through gravitational collapse. The potential energy of the gas was converted to thermal energy through this process. However, this process and the …
Sequential Eruptions Triggered by Flux Emergence: Observations and Modeling
Long, D. M.; van Driel-Gesztelyi, L.; Démoulin, P. +5 more
We describe and analyze observations by the Solar Dynamics Observatory of the emergence of a small, bipolar active region within an area of unipolar magnetic flux that was surrounded by a circular, quiescent filament. Within only 8 hours from the start of the emergence, a partial splitting of the filament and two consecutive coronal mass ejections…
ALMA Observations of the Solar Chromosphere on the Polar Limb
Shimojo, Masumi; Okamoto, Takenori J.; Yokoyama, Takaaki +1 more
We report the results of the Atacama Large Millimeter/sub-millimeter Array (ALMA) observations of the solar chromosphere on the southern polar limb. Coordinated observations with the Interface Region Imaging Spectrograph (IRIS) are also conducted. ALMA provided unprecedented high spatial resolution in the millimeter band (≈2.″0) at 100 GHz frequen…
Dense Molecular Gas in the Starburst Nucleus of NGC 1808
Salak, Dragan; Tomiyasu, Yuto; Nakai, Naomasa +3 more
Dense molecular gas tracers in the central 1 kpc region of the superwind galaxy NGC 1808 have been imaged by ALMA at a resolution of 1″ (∼50 pc). Integrated intensities and line intensity ratios of HCN (1-0), H13CN (1-0), HCO+ (1-0), H13CO+ (1-0), HOC+ (1-0), HCO+ (4-3), CS (2-1), C…
Wide-field Optical Spectroscopy of Abell 133: A Search for Filaments Reported in X-Ray Observations
Kelson, Daniel D.; Patel, Shannon G.; Connor, Thomas +7 more
Filaments of the cosmic web have long been associated with the threadlike structures seen in galaxy redshift surveys. However, despite their baryon content being dominated by hot gas, these filaments have been an elusive target for X-ray observations. Recently, detections of filaments in very deep (2.4 Ms) observations with Chandra were reported a…
The First Continuous Optical Monitoring of the Transitional Millisecond Pulsar PSR J1023+0038 with Kepler
D'Avanzo, P.; Campana, S.; Stella, L. +10 more
We report on the first continuous, 80-day optical monitoring of the transitional millisecond pulsar PSR J1023+0038 carried out in mid 2017 with Kepler in the K2 configuration, when an X-ray subluminous accretion disk was present in the binary. Flares lasting from minutes to 14 hr were observed for 15.6% of the time, which is a larger fraction than…
Star Formation in the Sh 2-53 Region Influenced by Accreting Molecular Filaments
Tamura, M.; Tachihara, Kengo; Dewangan, L. K. +6 more
We present a multiwavelength analysis of a ∼30‧ × 30‧ area around the Sh 2-53 region (hereafter S53 complex), which is associated with at least three H II regions, two mid-infrared bubbles (N21 and N22), and infrared dark clouds. The 13CO line data trace the molecular content of the S53 complex in a velocity range of 36-60 km s-1