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Does the radial-tangential macroturbulence model adequately describe the spectral line broadening of solar-type stars?*
Takeda, Yoichi; UeNo, Satoru
In incorporating the effect of atmospheric turbulence in the broadening of spectral lines, the so-called radial-tangential macroturbulence (RTM) model has been widely used in the field of solar-type stars, which was devised from intuitive appearance of the granular velocity field of the Sun. Since this model assumes that turbulent motions are rest…
Constraining the Physical State of the Hot Gas Halos in NGC 4649 and NGC 5846
Trinchieri, Ginevra; Romanowsky, Aaron J.; Brodie, Jean +15 more
We present results of a joint Chandra/XMM-Newton analysis of the early-type galaxies NGC 4649 and NGC 5846 aimed at investigating differences between mass profiles derived from X-ray data and those from optical data, to probe the state of the hot interstellar medium (ISM) in these galaxies. If the hot ISM is at a given radius in hydrostatic equili…
The X-Ray Reflection Spectrum of the Radio-loud Quasar 4C 74.26
Harrison, F. A.; Zhang, W. W.; Fabian, Andrew C. +11 more
The relativistic jets created by some active galactic nuclei are important agents of AGN feedback. In spite of this, our understanding of what produces these jets is still incomplete. X-ray observations, which can probe the processes operating in the central regions in the immediate vicinity of the supermassive black hole, the presumed jet launchi…
Fusion of photogrammetric and photoclinometric information for high-resolution DEMs from Mars in-orbit imagery
Luo, Bin; Douté, Sylvain; Jiang, Cheng +1 more
High-resolution Digital Elevation Models (DEMs) of the Martian surface are instrumental for studying the red planet. The Mars Orbiter Laser Altimeter (MOLA) instrument onboard the Mars Global Surveyor provided global DEM of high vertical resolution but with a limited spatial resolution that is not enough for characterizing small geological objects…
Can decaying particle explain cosmic infrared background excess?
Kohri, Kazunori; Nakayama, Kazunori; Moroi, Takeo
Recently the CIBER experiment measured the diffuse cosmic infrared background (CIB) flux and claimed an excess compared with integrated emission from galaxies. We show that the CIB spectrum can be fitted by the additional photons produced by the decay of a new particle. However, it also contributes too much to the anisotropy of the CIB, which is i…
SPIRITS 15c and SPIRITS 14buu: Two Obscured Supernovae in the Nearby Star-forming Galaxy IC 2163
Tinyanont, Samaporn; Smith, Nathan; Gehrz, Robert D. +22 more
SPitzer InfraRed Intensive Transients Survey—SPIRITS—is an ongoing survey of nearby galaxies searching for infrared (IR) transients with Spitzer/IRAC. We present the discovery and follow-up observations of one of our most luminous (M [4.5] = -17.1 ± 0.4 mag, Vega) and reddest ([3.6] - [4.5] = 3.0 ± 0.2 mag) transients, SPIRITS 15c. The …
Electron heating and energy inventory during asymmetric reconnection in a laboratory plasma
Roytershteyn, V.; Chen, Li-Jen; Ji, Hantao +6 more
Electron heating and the energy inventory during asymmetric reconnection are studied in the laboratory plasma with a density ratio of about 8 across the current sheet. Features of asymmetric reconnection such as the large density gradients near the low-density side separatrices, asymmetric in-plane electric field, and bipolar out-of-plane magnetic…
Solar Energetic Particle Forecasting Algorithms and Associated False Alarms
Dalla, S.; Walsh, R. W.; Swalwell, B.
Solar energetic particle (SEP) events are known to occur following solar flares and coronal mass ejections (CMEs). However, some high-energy solar events do not result in SEPs being detected at Earth, and it is these types of event which may be termed "false alarms".
The KMOS Cluster Survey (KCS). III. Fundamental Plane of Cluster Galaxies at z ≃ 1.80 in JKCS 041
Bender, Ralf; Mendel, J. Trevor; Cappellari, Michele +12 more
We present data for 16 galaxies in the overdensity JKCS 041 at z≃ 1.80 as part of the K-band Multi-Object Spectrograph (KMOS) Cluster Survey (KCS). With 20 hr integrations, we have obtained deep absorption-line spectra from which we derived velocity dispersions for seven quiescent galaxies. We combined photometric parameters derived from Hubble Sp…
HD 202206: A Circumbinary Brown Dwarf System
Harrison, Thomas E.; Benedict, G. Fritz
Using Hubble Space Telescope Fine Guidance Sensor astrometry and previously published radial velocity measures, we explore the exoplanetary system HD 202206. Our modeling results in a parallax, {π }{abs}=21.96+/- 0.12 milliseconds of arc, a mass for HD 202206 B of {{ M }}B={0.089}-0.006+0.007 {{ M }}