Search Publications
An X-ray bright nucleus in the low-surface-brightness galaxy UGC 6614
Naik, Sachindra; Das, M.; Jain, C. +1 more
We report a study of the X-ray emission from the nuclear region of the low-surface-brightness (LSB) galaxy UGC 6614. Very little is known about the central objects in LSB galaxies, especially their X-ray properties and X-ray spectra. In this study we have used XMM-Newton archival data to study the characteristics of the X-ray spectrum and the X-ra…
NGC 4102: High-resolution Infrared Observations of a Nuclear Starburst Ring
Turner, Jean L.; Beck, Sara C.; Lacy, John H.
The composite galaxy NGC 4102 hosts a LINER nucleus and a starburst. We mapped NGC 4102 in the 12.8 µm line of [Ne II], using the echelon spectrometer TEXES on the NASA IRTF, to obtain a data cube with 1farcs5 spatial, and 25 km s-1 spectral, resolution. Combining near-infrared, radio, and the [Ne II] data shows that the extinctio…
High-velocity-resolution observations of OH main line masers in the M82 starburst
Muxlow, T. W. B.; Argo, M. K.; Beswick, R. J. +2 more
Using the Very Large Array, a series of high-velocity-resolution observations have been made of the M82 starburst at 1.6GHz. These observations follow up on previous studies of the main line OH maser emission in the central kiloparsec of this starburst region, but with far greater velocity resolution, showing significant velocity structure in some…
Calibration of the AKARI Far-Infrared Imaging Fourier-Transform Spectrometer
Nakagawa, Takao; Shirahata, Mai; Doi, Yasuo +16 more
The Far-Infrared Surveyor (FIS) onboard the AKARI satellite has a spectroscopic capability provided by a Fourier transform spectrometer (FIS-FTS). FIS-FTS is the first space-borne imaging FTS dedicated to far-infrared astronomical observations. We describe the calibration process of the FIS-FTS, and discuss its accuracy and reliability. The calibr…
The data mining II: An analysis of 33 eclipsing binary light-curves observed by the INTEGRAL/OMC
Zasche, P.
Thirty-three eclipsing binaries were selected for an analysis from a huge database of observations made by the INTEGRAL/OMC camera. The photometric data were processed and analyzed, resulting in a first light-curve study of these neglected eclipsing binaries. The system CY Lac was discovered to be an eccentric one. In several systems from this sam…
Heavy coronal ions in the heliosphere. I. Global distribution of charge-states of C, N, O, Mg, Si, and S
Bzowski, M.; Grzedzielski, S.; Wachowicz, M. E. +1 more
Aims: Our aim is to investigate and study the de-charging of the elements C, N, O, Mg, Si and S-ions, and assess the fluxes of the resulting ENA in the heliosphere.
Methods: The model treats the heavy ions as test particles convected by (and in a particular case also diffusing through) a hydrodynamically calculated background plasma flow…
Constraining Coronal Heating: Employing Bayesian Analysis Techniques to Improve the Determination of Solar Atmospheric Plasma Parameters
Walsh, Robert W.; Adamakis, Sotiris; Morton-Jones, Anthony J.
One way of revealing the nature of the coronal heating mechanism is by comparing simple theoretical one-dimensional hydrostatic loop models with observations at the temperature and/or density structure along these features. The most well-known method for dealing with comparisons like that is the χ2 approach. In this paper we consider th…
New fast X-ray transient IGR J18462-0223 discovered by the INTEGRAL observatory
Sunyaev, R. A.; Grebenev, S. A.
Details of the discovery of a new X-ray source, IGR J18462-0223, on October 12, 2007, during a short (several hours), intense (∼35 mCrab at the peak) outburst of hard radiation by the IBIS/ISGRI gamma-ray telescope onboard the INTEGRAL observatory are given. The detection of another earlier outburst from this source occurred on April 28, 2006, in …
Low-temperature magnetic properties of iron-bearing sulfides and their contribution to magnetism of cometary bodies
Kohout, Tomáš; Kosterov, Andrei; Haloda, Jakub +2 more
In this study we present a review of low-temperature magnetic properties of alabandite (Fe, Mn)S, daubreelite FeCr 2S 4, pyrrhotite Fe 1-xS and troilite FeS updated with new experimental data. The results indicate that besides FeNi alloys mainly daubreelite with its Curie temperature T C ∼ 150…
XMM-Newton Observations of the Enigmatic Long Period Eclipsing Binary Epsilon Aurigæ: Constraining the Physical Models
Wolk, Scott J.; Guinan, Edward; Pillitteri, Ignazio +1 more
We report on an XMM-Newton observation of the unusual, long period (F0 supergiant + cool disk companion) eclipsing binary star epsilon Aurigæ observed in X-rays prior to the onset of the 2009-2011 eclipse phase. While it appears certain that a disk-like body is obscuring the star, it remains unclear what kind of object is at the center of the disk…