Search Publications
HST UV Spectroscopy of the Dwarf Starburst Galaxy Pox 186
Cannon, John M.; Skillman, Evan D.; Mehta, Vihang +4 more
Studying the galaxies responsible for reionization is often conducted through local reionization-era analogs; however, many of these local analogs are too massive to be representative of the low-mass star-forming galaxies that are thought to play a dominant role in reionization. The local, low-mass dwarf starburst galaxy Pox 186 is one such system…
Flares, Warps, Truncations, and Satellite: The Ultra-thin Galaxy UGC 11859
Beckman, John E.; Borlaff, Alejandro S.; Fanelli, Michael N. +2 more
The structure of the outskirts of galaxies provides valuable information about their past and evolution. Due to their projected orientation, edge-on isolated galaxies effectively serve as test labs in which to study the three-dimensional structures of galaxies, including warps and flares, and to explore the possible sources of such distortions. We…
Electron Rolling-Pin Distributions Preceding Dipolarization Fronts
Cao, J. B.; Liu, C. M.; Xing, X. N.
Electron rolling-pin distribution (RPDs), characterized by triple peaks at pitch angles 0°, 90°, and 180°, have recently been discovered in the terrestrial magnetosphere. Since the RPDs' formation is typically attributed to local betatron acceleration, RPDs have been believed to appear primarily inside strong magnetic regions, such as flux pileup …
Venusian Ionosphere During Deep Solar Minima: Some New Insights Using Akatsuki Radio Science Experiment
Choudhary, R. K.; Imamura, T.; Ambili, K. M. +1 more
The characteristic features of different layers in the Venus ionosphere during the deep solar minimum of the solar cycle 24 have been studied using a radio science experiment onboard the Akatsuki spacecraft. Radio signals from the spacecraft were tracked at the Indian deep space network, Bangalore; Usuda Deep Space Center, Japan; and DLR Ground st…
Dynamics of the star-forming region G345.51+0.84
Liu, Hong-Li; Qin, Sheng-Li; Pan, Sirong
With the Atacama Pathfinder Experiment mapping observations of 13CO and C18O (2-1) complemented with Herschel data, we have carried out a comprehensive analysis on dynamics of the G345.51+0.84 (G345 hereafter) region. It is composed of two physically connected components: the blue-shifted (i.e. G345Blue), and red-shifted velo…
The Neon Gap: Probing Ionization with Dwarf Galaxies at z 1
Koo, David C.; Guo, Yicheng; Guhathakurta, Puragra +2 more
We present measurements of [NeIII]λ3869 emission in z ~ 1 low-mass galaxies taken from the Keck/DEIMOS spectroscopic surveys HALO7D and DEEPwinds. We identify 167 individual galaxies with significant [NeIII] emission lines, including 112 "dwarf" galaxies with $\mathrm{log}({M}_{\star }/{M}_{\odot })\lt \,9.5$ , with 0.3 < z < 1.4. We also me…
Simultaneous Six-way Observations from the Navy Precision Optical Interferometer
van Belle, Gerard T.; Stone, Jordan M.; von Braun, Kaspar +7 more
We measured the angular diameters of six stars using the six-element observing mode of the Navy Precision Optical Interferometer (NPOI) for the first time since the early 2000s. Four of the diameters ranged from 1.2 to 1.9 mas, while the two others were much smaller at approximately 0.5 mas to 0.7 mas, which are the two smallest angular diameters …
Deep Large Binocular Camera r-band Observations of the GOODS-N Field
Fontana, Adriano; Grazian, Andrea; Grogin, Norman A. +22 more
We obtained 838 Sloan r-band images (~28 hr) of the GOODS-North field with the Large Binocular Camera (LBC) on the Large Binocular Telescope in order to study the presence of extended, low surface brightness features in galaxies and investigate the trade-off between image depth and resolution. The individual images were sorted by effective seeing,…
Invisible dilaton
Brax, Philippe; Valageas, Patrick; Burrage, Clare +1 more
We analyze the dynamics of a light scalar field responsible for the µ term of the Higgs potential and coupled to matter via the Higgs-portal mechanism. We find that this dilaton model is stable under radiative corrections induced by the standard model particle masses. When the background value of the scalar field is stabilized at the minimum…
A Deep Optical Survey of Young Stars in the Carina Nebula. I. UBVRI Photometric Data and Fundamental Parameters
Lim, Beomdu; Chun, Moo-Young; Hur, Hyeonoh
We present the deep homogeneous UBVRI photometric data of 135,071 stars down to V ~ 23 mag and I ~ 22 mag toward the Carina Nebula. These stars are cross-matched with those from the previous surveys in the X-ray, near-infrared, and mid-infrared wavelengths as well as the Gaia Early Data Release 3 (EDR3). This master catalog allows us to select rel…