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Stellar subsystems of the galaxy NGC 2366
Tikhonov, N. A.; Galazutdinova, O. A.
Hubble Space Telescope archive data are used to perform photometry of stars in seven fields at the center and periphery of the galaxy NGC 2366. The variation of the number density of stars of various ages with galactocentric radius and along the minor axis of the galaxy are determined. The boundaries of the thin and thick disks of the galaxy are f…
Discovery and Interpretation of an X-Ray Period in the Galactic Center Source CXOGC J174536.1-285638
Muno, Michael P.; Eikenberry, Stephen S.; Bandyopadhyay, Reba M. +1 more
We present X-ray and infrared observations of the X-ray source CXOGC J174536.1-285638. Previous observations suggest that this source may be an accreting binary with a high-mass donor (HMXB) or a colliding wind binary (CWB). Based on the Chandra and XMM-Newton light curve, we have found an apparent 189 +/- 6 day periodicity with better than 99.997…
Discovery, photometry, and astrometry of 49 classical nova candidates in M 81 galaxy
Garnavich, P. M.; Thilker, D. A.; Hornoch, K. +2 more
Aims: This paper reports on a search for new classical nova candidates in the M 81 galaxy based on archival, as well as recent, new images.
Methods: We used images from 1999-2007 to search for optical transients in M 81. The positions of the identified classical nova candidates were used to study their spatial distribution. Kolmogorov-Smirnov …
IC 4406: A Radio-Infrared View
Hora, Joseph L.; Trigilio, Corrado; Cerrigone, Luciano +1 more
IC 4406 is a large (about 100'' × 30'') southern bipolar planetary nebula composed of two elongated lobes extending from a bright central region where there is evidence for the presence of a large torus of gas and dust. We show new observations of this source performed with IRAC (Spitzer Space Telescope) and the Australia Telescope Compact Array. …
SUBARU High-Dispersion Spectroscopy of Hα and [N II] 6583 Å Emission in the HH 46/47 Jet
Pyo, Tae-Soo; Takami, Michihiro; Hayashi, Masahiko +2 more
We present slit-scan observations of the Hα and [N II] 6583 Å emission lines toward the HH 46/47 jet with the Subaru Telescope. The spectral resolution of R = 3.6 × 104 allowed us to study the kinematics of individual features in unprecedented detail. The spectra show (1) the main jet component (VLSR ~ - 160 km s-1…
Reconnection in a slow Coronal Mass Ejection
Romoli, M.; Bemporad, A.; Landini, F. +1 more
This paper aims at studying reconnection occurring in the aftermath of the 28 May 2004, CME, first imaged by the LASCO (Large Angle and Spectrometric Coronagraph) C2 at 11:06 UT. The CME was observed in White Light and UV radiation: images acquired by the LASCO C2 and C3 coronagraphs and spectra acquired by UVCS (Ultraviolet Coronagraph Spectromet…
Heavy Element Analysis of X-Ray Faint Elliptical Galaxies
Fukazawa, Yasushi; Tozuka, Miyako
Past ASCA and ROSAT observations could not support the general view that elliptical galaxies are sources of metals in the intracluster medium, since observational results have shown that X-ray faint elliptical galaxies exhibit too low metal abundances of hot interstellar medium (ISM). We investigated the radial profiles of the temperature and abun…
Search for methane on Mars: Observations, interpretation and future work
Encrenaz, Thérèse
The detection of methane on Mars has been reported by three different teams in 2004. Two of them used ground-based high-resolution spectroscopy in the near infrared range. The third one used the Planetary Fourier Spectrometer aboard Mars Express. Among the data sets, two of them reported a mean CH4 mixing ratio of 10 ppb. However, these…
A conceptual model for explanation of Albedo changes in Martian craters
Yue, Z.; Zhu, M.; Xie, H. +3 more
We propose a conceptual model to interpret AM/PM high albedo events (HAEs) in crater interiors at the Martian seasonal polar caps. This model consists of two components: (1) a relatively permanent high-albedo water-ice body exposed in a crater interior and (2) a variable crater albedo in response to aerosol optical depth, dust contamination, and H…
Conjugate observation of sharp dynamical boundary in the inner magnetosphere by Cluster and DMSP spacecraft and ground network
Nakamura, R.; Sergeev, V. A.; Baumjohann, W. +9 more
We investigate an unusual sharp boundary separating two plasma populations (inner magnetospheric plasma with high fluxes of energetic particles and plasma sheet) observed by the Cluster quartet near its perigee on 16 December 2003. Cluster was in a pearl-on-string configuration at 05:00 MLT and mapped along magnetic field lines to ~8 9 RE