Search Publications
Nonthermal Velocity in the Transition Region of Active Regions and Its Center-to-limb Variation
Tripathi, Durgesh; Ghosh, Avyarthana; Klimchuk, James A.
We derive the nonthermal velocities (NTVs) in the transition region of an active region using the Si IV 1393.78 Å line observed by the Interface Region Imaging Spectrograph and compare them with the line-of-sight photospheric magnetic fields obtained by the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory. The active region…
Optical Properties of Interstellar Dust around the Orion A Molecular Cloud
Dobashi, Kazuhito; Shimoikura, Tomomi; Naoi, Takahiro +2 more
We have studied optical properties of interstellar dust around the Orion A molecular cloud to investigate the size distribution and the composition of dust grains. Orion A is one of the most studied molecular clouds in the solar vicinity (d ≃ 400 pc). In this paper, we used optical and near-infrared photometric data. The optical data were obtained…
Deep Observations of CO and Free-Free Emission in Ultraluminous Infrared QSO IRAS F07599+6508
Kohno, Kotaro; Daddi, Emanuele; Gao, Yu +4 more
Infrared quasi-stellar objects (IR QSOs) are a rare subpopulation selected from ultraluminous infrared galaxies (ULIRGs) and have been regarded as promising candidates of ULIRG-to-optical QSO transition objects. Here we present NOEMA observations of the CO (1-0) line and 3 mm continuum emission in IR QSO IRAS F07599+6508 at z = 0.1486, which has m…
Searching for Surviving Companion in the Young SMC Supernova Remnant 1E 0102.2-7219
Ruiter, Ashley J.; Chu, You-Hua; Li, Chuan-Jui +3 more
1E 0102.2-7219 (hereafter E0102) is a young supernova remnant (SNR) in the Small Magellanic Cloud. It contains oxygen-rich SN ejecta, a possible neutron star (NS), and a small amount of fast-moving H-rich ejecta material. These properties are also seen in Cas A; it has thus been suggested that E0102 is also a Type IIb SNR, whose SN progenitor's hy…
Using Cosmic Rays Detected by HST as Geophysical Markers. I. Detection and Characterization of Cosmic Rays
Tancredi, Gonzalo; Deustua, Susana E.; Miles, Nathan D. +3 more
The Hubble Space Telescope (HST) has been operational for over 30 years, and throughout that time it has been bombarded by high-energy charged particles colloquially referred to as cosmic rays. In this paper, we present a comprehensive study of more than 1.2 billion cosmic rays observed with HST using a custom-written Python package, HSTcosmicrays…
Deciphering the 3D Orion Nebula. III. Structure on the NE Boundary of the Orion-S Embedded Molecular Cloud
Abel, N. P.; O'Dell, C. R.; Ferland, G. J.
We have extended the work of Papers I and II of this series to determine at a higher spatial resolution the properties of the embedded Orion-S Molecular Cloud that lies within the ionized cavity of the Orion Nebula and of the thin ionized layer that lies between the Cloud and the observer. This was done using existing and new [N II] (658.3 nm) and…
The Gaia-ASAS-SN Classical Cepheid Sample. I. Sample Selection
Rix, Hans-Walter; Drimmel, R.; Poggio, E. +4 more
We present a well-defined and characterized all-sky sample of classical Cepheids in the Milky Way, obtained by combining two time-domain all-sky surveys: Gaia DR2 (Gaia Collaboration et al. 2018) and All-Sky Automated Survey for Supernovae (ASAS-SN; Shappee et al. 2014). We first use parallax and variability information from Gaia to select ~30,000…
Probing Gas Kinematics and PDR Structure around O-type Stars in the Sh 2-305 H II Region
Dewangan, L. K.; Ojha, D. K.; Sharma, Saurabh +3 more
We report an observational study of the Galactic H II region Sh 2-305/S305 using the [C II] 158 µm line data, which are used to examine the gas dynamics and structure of photodissociation regions. The integrated [C II] emission map at [39.4, 49.5] km s-1 spatially traces two shell-like structures (i.e., inner and outer neutral she…
Internal Structure of Molecular Gas in a Main-sequence Galaxy With a UV Clump at z = 1.45
Hatsukade, Bunyo; Ohta, Kouji; Yabe, Kiyoto +2 more
We present results of subarcsec Atacama Large Millimeter/submillimeter Array observations of CO(2-1) and CO(5-4) toward a massive main-sequence galaxy at z = 1.45 in the Subaru-XMM/Newton Deep Survey/UDS field, aiming at examining the internal distribution and properties of molecular gas in the galaxy. Our target galaxy consists of the bulge and d…
VLT/MUSE and ATCA Observations of the Host Galaxy of the Short GRB 080905A at z = 0.122
Hunt, L. K.; Hartmann, D. H.; Klose, S. +4 more
Short-GRB progenitors could come in various flavors, depending on the nature of the merging compact stellar objects (including a stellar-mass black hole or not) or depending on their ages (millions or billions of years). At a redshift of z = 0.122, the nearly face-on spiral host of the short GRB 080905A is one of the closest short-GRB host galaxie…