Search Publications
Understanding the X-ray spectrum of anomalous X-ray pulsars and soft gamma-ray repeaters
Liu, Yuan; Guo, Yan-Jun; Tong, Hao +3 more
Hard X-rays above 10 keV are detected from several anomalous X-ray pulsars (AXPs) and soft gamma-ray repeaters (SGRs), and different models have been proposed to explain the physical origin within the frame of either a magnetar model or a fallback disk system. Using data from Suzaku and INTEGRAL, we study the soft and hard X-ray spectra of four AX…
Detection of Extremely Broad Water Emission from the Molecular Cloud Interacting Supernova Remnant G349.7+0.2
Rho, J.; Hewitt, J. W.; Boogert, A. +2 more
We performed Herschel HIFI, PACS, and SPIRE observations toward the molecular cloud interacting supernova remnant G349.7+0.2. An extremely broad emission line was detected at 557 GHz from the ground state transition 110-101 of ortho-water. This water line can be separated into three velocity components with widths of 144, 27,…
Spicules Intensity Oscillations in SOT/HINODE Observations
Ahangarzadeh Maralani, A. R.; Tavabi, E.; Ajabshirizadeh, A. +1 more
We study the coherency of solar spicules intensity oscillations with increasing height above the solar limb in quiet Sun, active Sun and active region using observations from HINODE/SOT. Existence of coherency up to transition region strengthens the theory of the coronal heating and solar wind, through energy transport and photospheric oscillation…
Not a galaxy: IRAS 04186+5143, a new young stellar cluster in the outer Galaxy
Elia, Davide; Molinari, S.; Torrelles, J. M. +2 more
We report the discovery of a new young stellar cluster in the outer Galaxy located at the position of an IRAS Point Source Catalog source that has been previously misidentified as an external galaxy. The cluster is seen in our near-infrared imaging towards IRAS 04186+5143 and in archive Spitzer images confirming the young stellar nature of the sou…
High angular resolution stellar imaging with occultations from the Cassini spacecraft - II. Kronocyclic tomography
Nicholson, Philip D.; Hedman, Matthew M.; Lloyd, James P. +2 more
We present an advance in the use of Cassini observations of stellar occultations by the rings of Saturn for stellar studies. Stewart et al. demonstrated the potential use of such observations for measuring stellar angular diameters. Here, we use these same observations, and tomographic imaging reconstruction techniques, to produce two-dimensional …
Forecasting SEP events with same active region prior flares
White, S. M.; Kahler, S. W.; Ling, A.
Forecasting large solar energetic (E > 10 MeV) particle (SEP) events is currently based on observed solar X-ray flare peak fluxes or fluences. Recent work has indicated that the probability of a solar eruptive event in an active region (AR) is enhanced when a large flare has occurred in that AR during the previous day. In addition, peak intensi…
The dependence of the AV prior for SN Ia on host mass and disc inclination
Holwerda, B. W.; Keel, W. C.; Kenworthy, M. A. +1 more
Type Ia supernovae (SNe Ia) are used as `standard candles' for cosmological distance scales. To fit their light-curve shape-absolute luminosity relation, one needs to assume an intrinsic colour and a likelihood of host galaxy extinction or a convolution of these, a colour distribution prior. The host galaxy extinction prior is typically assumed to…
Sub-MeV band observation of a hard burst from AXP 1E 1547.0-5408 with the Suzaku Wide-band All-sky Monitor
Enoto, Teruaki; Yamaoka, Kazutaka; Makishima, Kazuo +10 more
The 2.1-s anomalous X-ray pulsar 1E 1547.0-5408 exhibited an X-ray outburst on 2009 January 22, emitting a large number of short bursts. The wide-band all-sky monitor (WAM) on-board Suzaku detected at least 254 bursts in the 160 keV-6.2 MeV band over the period of January 22 00:57-17:02 UT from the direction of 1E 1547.0-5408. One of these bursts,…
Residual HCRF rotation relative to the inertial coordinate system
Bobylev, V. V.
VLBI measurements of the absolute proper motions of 23 radio stars have been collected from published data. These are stars with maser emission, or very young stars, or asymptotic-giant-branch stars. By comparing these measurements with the stellar proper motions from the optical catalogs of the Hipparcos Celestial Reference Frame (HCRF), we have …
UBVRI Analysis of the Totally Eclipsing Extreme Mass Ratio W UMa Binary, GSC 3208 1986
Van Hamme, W.; Robb, Russell; Samec, R. G. +2 more
GSC 3208 1986 is an NSVS and TYCHO binary, first observed from 1999 to 2000. It is a W UMa binary with a period of 0.405 days. The present observations were taken in 2012 September and are of high precision, averaging a standard deviation of better than 5 mmag. The amplitude of the light curve is very nearly 0.5 mag yet it undergoes total eclipses…