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Water Masers in the Andromeda Galaxy. II. Where Do Masers Arise?
Darling, Jeremy; Amiri, Nikta
We present a comparative multiwavelength analysis of water-maser-emitting regions and non-maser-emitting luminous 24 µm star-forming regions in the Andromeda Galaxy (M31) to identify the sites most likely to produce luminous water masers useful for astrometry and proper motion studies. Included in the analysis are Spitzer 24 µm photome…
Origin of the backstreaming ions in a young Hot Flow Anomaly
Vaisberg, O. L.; Shuvalov, S. D.; Shestakov, A. Yu. +1 more
We analyze an event in front of the bow shock observed by Cluster spacecraft on 22.02.2006. This event has many attributes of Hot Flow Anomaly at early stage of development including strong upstream beam and disturbed magnetic profile with increased magnetic field at one or two sides as observed by 4 Cluster spacecraft. The angle between the magne…
Wave-particle resonance condition test for ion-kinetic waves in the solar wind
Glassmeier, K. -H.; Marsch, E.; Narita, Y. +3 more
Conditions for the Landau and cyclotron resonances are tested for 543 waves (identified as local peaks in the energy spectra) in the magnetic field fluctuations of the solar wind measured by the Cluster spacecraft on a tetrahedral scale of 100 km. The resonance parameters are evaluated using the frequencies in the plasma rest frame, the parallel c…
Mission Oriented Support and Theory (MOST) for MMS—the Goddard Space Flight Center/University of California Los Angeles Interdisciplinary Science Program
Hwang, Kyoung-Joo; Goldstein, Melvyn L.; El-Alaoui, Mostafa +8 more
The MOST IDS team was tasked with focusing on two general areas: The first was to participate with the Fast Plasma Investigation (FPI) team in the development of virtual detectors that model the instrument responses of the MMS FPI sensors. The virtual instruments can be "flown through" both simulation data (from magnetohydrodynamic, hybrid, and ki…
Exploring high-z galaxies with the E-ELT
Gullieuszik, M.; Falomo, R.; Greggio, L. +2 more
We present simulated observations of galaxies at z = 2 and z = 3 to probe the capabilities of next-generation telescopes (E-ELT and JWST) to measure the structural and photometrical properties of high-redshift galaxies. We carry out an extensive set of simulations of high-redshift galaxies adopting the specifications of the E-ELT first light instr…
Study of a bright-rimmed cloud at the border of the infrared dust bubble CN20
Rubio, M.; Ortega, M. E.; Giacani, E. +1 more
We characterize an uncatalogued bright-rimmed cloud located at the border of the infrared dust bubble CN20 with the aim of investigating triggered star formation. In order to do this, we carried out radio continuum observations at 8.9 GHz using the Jansky Very Large Array (JVLA) interferometer with a synthesized beam size of 13 arcsec × 5 arcsec, …
X-ray study of the supernova remnant G337.2-0.7
Koyama, Katsuji; Uchida, Hiroyuki; Nobukawa, Masayoshi +3 more
This paper reports on the Suzaku result of the Galactic supernova remnant (SNR) G337.2-0.7. The X-ray spectrum is well explained by three components in ionizing phase. One is a plasma with a low temperature kT = 0.70_{-0.03}^{+0.02}keV, solar abundances, and an ionization parameter n_et = 5.7^{+0.7}_{-0.4}× 10^{11}s cm-3. The second is …
Radiation-driven winds of hot luminous stars. XVIII. The unreliability of stellar and wind parameter determinations from optical vs. UV spectral analysis of selected central stars of planetary nebulae and the possibility of some CSPNs as single-star supernova Ia progenitors
Pauldrach, A. W. A.; Kaschinski, C. B.; Hoffmann, T. L.
Context. The uncertainty in the degree to which radiation-driven winds of hot stars might be affected by small inhomogeneities in the density leads to a corresponding uncertainty in the determination of the atmospheric mass loss rates from the strength of optical recombination lines and - since the mass loss rate is not a free parameter but a func…
X-ray and infrared diagnostics of nearby active galactic nuclei with MAXI and AKARI
Nakagawa, Takao; Baba, Shunsuke; Isobe, Naoki +5 more
Nearby active galactic nuclei were diagnosed in the X-ray and mid-to-far infrared wavelengths with Monitor of All-sky X-ray Image (MAXI) and the Japanese infrared observatory AKARI, respectively. One hundred of the X-ray sources listed in the second release of the MAXI all-sky X-ray source catalog are currently identified as non-blazar-type active…
Analysis of horizontal flows in the solar granulation
Suematsu, Y.; Shimizu, T.; Quintero Noda, C.
Solar limb observations sometimes reveal the presence of a satellite lobe in the blue wing of the Stokes I profile from pixels belonging to granules. The presence of this satellite lobe has been associated in the past to strong line-of-sight gradients and, as the line-of-sight component is almost parallel to the solar surface, to horizontal granul…