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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…
Joint HST, VLT/MUSE, and XMM-Newton observations to constrain the mass distribution of the two strong lensing galaxy clusters: MACS J0242.5-2132 and MACS J0949.8+1708
Lewis, Geraint F.; Mahler, Guillaume; Lagattuta, David J. +6 more
We present the strong lensing analysis of two galaxy clusters: MACS J0242.5-2132 (MACS J0242, z = 0.313) and MACS J0949.8+1708 (MACS J0949, z = 0.383). Their total matter distributions are constrained, thanks to the powerful combination of observations with the Hubble Space Telescope (HST) and the Multi-Unit Spectroscopic Explorer instrument. Usin…
Polycyclic aromatic hydrocarbon size tracers
Boersma, C.; Peeters, E.; Maragkoudakis, A. +1 more
We examine the dependence of polycyclic aromatic hydrocarbon (PAH) band intensity ratios as a function of the average number of carbon atoms and assess their effectiveness as tracers for PAH size, utilizing the data, models, and tools provided by the NASA Ames PAH Infrared Spectroscopic Data base. To achieve this, we used spectra from mixtures of …
High-energy particle enhancements in the solar wind upstream Mercury during the first BepiColombo flyby: SERENA/PICAM and MPO-MAG observations
Kallio, E.; Barabash, S.; Livi, S. +27 more
Context. The first BepiColombo Mercury flyby offered the unique opportunity to simultaneously characterize the plasma and the magnetic field properties of the solar wind in the vicinity of the innermost planet of the Solar System (0.4 AU).
Aims: In this study, we use plasma observations by SERENA/PICAM and magnetic field measurements by MPO-M…