Search Publications
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…
Spatial Variation in Temperature and Density in the IC 63 PDR from H2 Spectroscopy
Karoly, Janik; Soam, Archana; Andersson, B. -G. +2 more
We have measured the gas temperature in the IC 63 photodissociation region (PDR) using the S(1) and S(5) pure rotation lines of molecular hydrogen with SOFIA/EXES. We divide the PDR into three regions for analysis based on the illumination from γ Cas: sunny, ridge, and shady. Constructing rotation diagrams for the different regions, we obtain temp…
Constraining Soft and Hard X-Ray Irradiation in Ultraluminous X-Ray Sources
Feng, Hua; Qiu, Yanli
Most ultraluminous X-ray sources (ULXs) are argued to be powered by supercritical accretion onto compact objects. One of the key questions regarding these objects is whether or not the hard X-rays are geometrically beamed toward the symmetric axis. We propose testing the scenario using disk irradiation to see how much the outer accretion disk sees…
SDSS J1059+4251, a Highly Magnified z 2.8 Star-forming Galaxy: ESI Observations of the Rest-frame UV Spectrum
Pettini, Max; Erb, Dawn K.; James, Bethan L. +3 more
Detailed analyses of high-redshift galaxies are challenging because these galaxies are faint, but this difficulty can be overcome with gravitational lensing, in which the magnification of the flux enables spectroscopy with a high signal-to-noise ratio (S/N). We present the rest-frame ultraviolet (UV) Keck Echellette Spectrograph and Imager (ESI) s…
The Complex Nature of Magnetic Element Transport in the Quiet Sun: The Multiscaling Character
Consolini, Giuseppe; Giannattasio, Fabio
In recent studies the dynamic properties of small-scale magnetic fields (magnetic elements [MEs]) in the quiet Sun were used to investigate peculiar features of turbulent convection and get insights on the characteristic spatial and temporal scales of evolution of magnetic fields, from granular to supergranular. The aim of this work is to extend p…