Search Publications
A Multiline Study of a High-mass Young Stellar Object in the Small Magellanic Cloud with ALMA: The Detection of Methanol Gas at 0.2 Solar Metallicity
Onaka, Takashi; Aikawa, Yuri; Shimonishi, Takashi +5 more
We report the results of subparsec-scale submillimeter observations toward an embedded high-mass young stellar object in the Small Magellanic Cloud (SMC) with ALMA. Complementary infrared data obtained with the AKARI satellite and the Gemini South telescope are also presented. The target infrared point source is spatially resolved into two dense m…
The Evolution of Protoplanetary Disks: Probing the Inner Disk of Very Low Accretors
Reiter, Megan; Calvet, Nuria; Briceño, César +7 more
We report FUV, optical, and NIR observations of three T Tauri stars in the Orion OB1b subassociation with Hα equivalent widths consistent with low or absent accretion and various degrees of excess flux in the mid-infrared. We aim to search for evidence of gas in the inner disk in HST Advanced Camera for Surveys/Solar Blind Channel spectra, and to …
Herschel Observations of Protoplanetary Disks in Lynds 1641
Kim, Kyoung Hee; Fischer, William J.; Calvet, Nuria +7 more
We analyze Herschel Space Observatory observations of 104 young stellar objects with protoplanetary disks in the ∼1.5 Myr star-forming region Lynds 1641 (L1641) within the Orion A Molecular Cloud. We present spectral energy distributions from the optical to the far-infrared including new photometry from the Herschel Photodetector Array Camera and …
Red Supergiants in the JWST Era. I. Near-IR Photometric Diagnostics
Levesque, Emily M.
The Near Infrared Camera (NIRCam) on the James Webb Space Telescope (JWST) will be an incredibly powerful instrument for studying red supergiants (RSGs). The high luminosities and red peak wavelengths of these stars make them ideal targets for JWST/NIRCam. With effective photometric diagnostics in place, imaging RSG populations in multiple filters…
GalMod: A Galactic Synthesis Population Model
Grebel, Eva K.; Zeidler, Peter; Crnojević, Denija +7 more
We present a new Galaxy population synthesis Model, GalMod. GalMod is a star-count model featuring an asymmetric bar/bulge as well as spiral arms and related extinction. The model, initially introduced in Pasetto et al., has been here completed with a central bar, a new bulge description, new disk vertical profiles, and several new bolometric corr…
Revealing the Evolution of Non-thermal Electrons in Solar Flares Using 3D Modeling
Fleishman, Gregory D.; Nita, Gelu M.; Kuroda, Natsuha +4 more
Understanding non-thermal particle generation, transport, and escape in solar flares requires detailed quantification of the particle evolution in the realistic 3D domain where the flare takes place. Rather surprisingly, apart from the standard flare scenario and integral characteristics of non-thermal electrons, not much is known about the actual…
Properties of a Small-scale Short-duration Solar Eruption with a Driven Shock
Feng, Li; Lu, Lei; Gan, Weiqun +5 more
Large-scale solar eruptions have been extensively explored over many years. However, the properties of small-scale events with associated shocks have rarely been investigated. We present analyses of a small-scale, short-duration event originating from a small region. The impulsive phase of the M1.9-class flare lasted only four minutes. The kinemat…
Detection of [O III] at z ∼ 3: A Galaxy Above the Main Sequence, Rapidly Assembling Its Stellar Mass
Menten, Karl M.; Güsten, Rolf; Weiss, Axel +8 more
We detect bright emission in the far-infrared (far-IR) fine structure [O III] 88 µm line from a strong lensing candidate galaxy, H-ATLAS J113526.3-014605, hereafter G12v2.43, at z = 3.127, using the second-generation Redshift (z) and Early Universe Spectrometer (ZEUS-2) at the Atacama Pathfinder Experiment Telescope (APEX). This is only the …
Magnetic Helicity Reversal in the Corona at Small Plasma Beta
Brandenburg, Axel; Bourdin, Philippe; Singh, Nishant K.
Solar and stellar dynamos shed small-scale and large-scale magnetic helicity of opposite signs. However, solar wind observations and simulations have shown that some distance above the dynamo both the small-scale and large-scale magnetic helicities have reversed signs. With realistic simulations of the solar corona above an active region now being…
Velocity-resolved [{\rm{C}}\,{\rm{II}}] Emission from Cold Diffuse Clouds in the Interstellar Medium
Neufeld, David A.; Wolfire, Mark G.; Simon, Robert +3 more
We have combined emission from the 158 µm fine structure transition of C+ observed with the GREAT and upGREAT instruments on SOFIA with 21 cm absorption spectra and visual extinction to characterize the diffuse interstellar clouds found along the lines of sight. The weak [C II] emission is consistent in velocity and line width wit…