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Effective Opacity of the Intergalactic Medium from Galaxy Spectra Analysis
Chisholm, John; Prochaska, J. Xavier; Lee, Khee-Gan +1 more
We measure the effective opacity ( ${\tau }_{\mathrm{eff}}$ ) of the intergalactic medium from the composite spectra of 281 Lyman-break galaxies in the redshift range 2 ≲ z ≲ 3. Our spectra are taken from the COSMOS Lyα Mapping And Tomographic Observations survey derived from the Low Resolution Imaging Spectrometer on the W.M. Keck I telescope. We…
Is the primary CoRoT target HD 43587 under a Maunder minimum phase?
Barbosa, R.; do Nascimento, J. -D.; Castro, M. +4 more
Context. One of the most enigmatic phenomena related to solar activity is the so-called Maunder minimum phase. It consists in the lowest sunspot count ever registered for the Sun and has not been confirmed for other stars to date. Since the spectroscopic observations of stellar activity at the Mount Wilson Observatory, the solar analog HD 43587 ha…
Absolute parameters of three southern eclipsing binaries: DQ Car, BK Ind, and V4396 Sgr
Erdem, Ahmet; Sürgit, Derya; Engelbrecht, Chris A. +1 more
We present combined photometric and spectroscopic analyses of the three southern eclipsing binary stars: DQ Car, BK Ind, and V4396 Sgr. Radial velocity curves of these three systems were obtained at the South African Astronomical Observatory, and their light curves from the available data bases and surveys were used for the analysis. 75 new times …
Relationship between Current Filaments and Turbulence During a Turbulent Reconnection
Yu, Y.; Chen, Z. Z.; Chen, F. +1 more
Both magnetic reconnection and turbulence can play crucial roles in space plasmas. The current layers, developing during magnetic reconnection, can collapse into various small-scale coherent structures, such as current filaments. These current filaments can significantly modulate the kinetic-scale turbulence. However, the quantitative correlation …
Spatially Resolved C III] λ1909 Emission in Haro 11
Hayes, Matthew; Inoue, Akio K.; Östlin, Göran +7 more
The C III] 1909 (hereafter C III]) line is the strongest ultraviolet emission line after Lyα and is therefore of interest to high-redshift studies of star-forming (SF) galaxies near the epoch of reionization. It is thought that C III] emission is strongest in galaxies with subsolar metallicity and low mass; however, spectral observations of numero…
The Hubble Space Telescope Advanced Camera for Surveys Emission Line Survey of Andromeda. I. Classical Be Stars
Dalcanton, J. J.; Choi, Y.; Johnson, L. C. +9 more
We present results from a two epoch Hubble Space Telescope Hα emission line survey of the Andromeda galaxy that overlaps the footprint of the Panchromatic Hubble Andromeda Treasury (PHAT) survey. We found 552 (542) classical Be stars and 8429 (8556) normal B-type stars in epoch # 1 (epoch # 2), yielding an overall fractional Be content of 6.15% ± …
Long-term Near-infrared Brightening of Nonvariable OH/IR Stars
Mito, Hiroyuki; Nakada, Yoshikazu; Ita, Yoshifusa +8 more
Nonvariable OH/IR stars are thought to have just left the asymptotic giant branch (AGB) phase. In this conventional picture, they must still show strong circumstellar extinction caused by the dust ejected during the AGB phase, and the extinction is expected to decrease over time because of the dispersal of the circumstellar dust after the cessatio…
Measurements of Magnetic Field Fluctuations for Plasma Wave Investigation by the Search Coil Magnetometers (SCM) Onboard Bepicolombo Mio (Mercury Magnetospheric Orbiter)
Sahraoui, Fouad; Le Contel, Olivier; Kasaba, Yasumasa +15 more
This paper describes the design and performance of the search coil magnetometers (SCM), which are part of the Plasma Wave Investigation (PWI) instrument onboard the BepiColombo/Mio spacecraft (Mercury Magnetospheric Orbiter), which will measure the electric field, plasma waves and radio waves for the first time in Mercury's plasma environment. The…
Herschel 158 µm [{C} {II}}] Observations of "CO-dark" Gas in the Perseus Giant Molecular Cloud
Stanimirović, Snežana; Lee, Min-Young; Wolfire, Mark +2 more
We present observations of velocity-resolved [C II] 158 µm emission from both a dense and a more diffuse photodissociation region (PDR) in the Perseus giant molecular cloud using the Heterodyne Instrument for the Far-Infrared on board the Herschel Space Telescope. We detect [C II] emission from 80% of the total positions, with a 95% detectio…
Mars Express Observations of Cold Plasma Structures in the Martian Magnetotail
Lester, M.; Edberg, N. J. T.; Andrews, D. J. +5 more
We present observations from five Mars Express (MEX) orbits in September 2016 while the spacecraft passed through the Martian induced magnetotail at altitudes up to 3,500 km. On these orbits, the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) instrument was operated in Active Ionospheric Sounding (AIS) mode at much higher alti…