Search Results - "Vilhu, O"

The nature of the hard state of Cygnus X-3 by Hjalmarsdotter, L., Zdziarski, A. A., Larsson, S., Beckmann, V., McCollough, M., Hannikainen, D. C., Vilhu, O.

“…The X-ray binary Cygnus X-3 (Cyg X-3) is a highly variable X-ray source that displays a wide range of observed spectral states. One of the main states is…”
Get full text

2 Years of INTEGRAL Monitoring of GRS 1915+105. II. X-Ray Spectro-Temporal Analysis by Rodriguez, J, Shaw, S. E, Hannikainen, D. C, Belloni, T, Corbel, S, Cadolle Bel, M, Chenevez, J, Prat, L, Kretschmar, P, Lehto, H. J, Mirabel, I. F, Paizis, A, Pooley, G, Tagger, M, Varnière, P, Cabanac, C, Vilhu, O

“…This is the second paper presenting the results of 2 yr of monitoring of GRS 1915+105 with INTEGRAL, RXTE, and the Ryle Telescope. We present the X-ray…”
Get full text

2 Years of INTEGRAL Monitoring of GRS 1915+105. I. Multiwavelength Coverage with INTEGRAL, RXTE, and the Ryle Radio Telescope by Rodriguez, J, Hannikainen, D. C, Shaw, S. E, Pooley, G, Corbel, S, Tagger, M, Mirabel, I. F, Belloni, T, Cabanac, C, Cadolle Bel, M, Chenevez, J, Kretschmar, P, Lehto, H. J, Paizis, A, Varnière, P, Vilhu, O

“…We report the results of simultaneous monitoring observations of the Galactic microquasar GRS 1915+105 with INTEGRAL and RXTE from 3 up to [image]300 keV, and…”
Get full text

Spectral Properties of Low-Frequency Quasi-periodic Oscillations in GRS 1915+105 by Rodriguez, J, Corbel, S, Hannikainen, D. C, Belloni, T, Paizis, A, Vilhu, O

“…We report on the timing analysis of RXTE observations of the Galactic microquasar GRS 1915+105 performed in 2003. Out of a total of six similar to 20 ks…”
Get full text

Exploring the spreading layer of GX 9+9 using RXTE and INTEGRAL by Savolainen, P., Hannikainen, D. C., Vilhu, O., Paizis, A., Nevalainen, J., Hakala, P.

“…We have fitted ∼200 RXTE and INTEGRAL spectra of the neutron star (NS) low-mass X-ray binary (LMXB) GX 9+9 from 2002 to 2007 with a model consisting of a disc…”
Get full text

The nature of the infrared counterpart of IGR J19140+0951 by Hannikainen, D. C., Rawlings, M. G., Muhli, P., Vilhu, O., Schultz, J., Rodriguez, J.

“…The International Gamma-Ray Astrophysics Laboratory observatory has been (re-)discovering new X-ray sources since the beginning of nominal operations in early…”
Get full text

The D-CIXS X-ray mapping spectrometer on SMART-1 by Grande, M, Browning, R, Waltham, N, Parker, D, Dunkin, S.K, Kent, B, Kellett, B, Perry, C.H, Swinyard, B, Perry, A, Feraday, J, Howe, C, McBride, G, Phillips, K, Huovelin, J, Muhli, P, Hakala, P.J, Vilhu, O, Laukkanen, J, Thomas, N, Hughes, D, Alleyne, H, Grady, M, Lundin, R, Barabash, S, Baker, D, Clark, P.E, Murray, C.D, Guest, J, Casanova, I, d'Uston, L.C, Maurice, S, Foing, B, Heather, D.J, Fernandes, V, Muinonen, K, Russell, S.S, Christou, A, Owen, C, Charles, P, Koskinen, H, Kato, M, Sipila, K, Nenonen, S, Holmstrom, M, Bhandari, N, Elphic, R, Lawrence, D

“…The D-CIXS Compact X-ray Spectrometer will provide high quality spectroscopic mapping of the Moon, the primary science target of the ESA SMART-1 mission…”
Get full text

The Distance of the Soft Gamma Repeater SGR 1806–20 by Corbel, S, Wallyn, P, Dame, T. M, Durouchoux, P, Mahoney, W. A, Vilhu, O, Grindlay, J. E

Get full text

The SMART-1 X-ray solar monitor (XSM): calibrations for D-CIXS and independent coronal science by Huovelin, J., Alha, L., Andersson, H., Andersson, T., Browning, R., Drummond, D., Foing, B., Grande, M., Hämäläinen, K., Laukkanen, J., Lämsä, V., Muinonen, K., Murray, M., Nenonen, S., Salminen, A., Sipilä, H., Taylor, I., Vilhu, O., Waltham, N., Lopez-Jorkama, M.

“…The X-ray solar monitor (XSM) is a calibration instrument of the demonstration of compact imaging X-ray spectrometer (D-CIXS) experiment, with a separate…”
Get full text

Gem detectors for X-ray astronomy by Andersson, H., Andersson, T., Heino, J., Huovelin, J., Kurvinen, K., Lauhakangas, R., Nenonen, S., Ojala, J., Orava, R., Schultz, J., Sipilä, H., Vilhu, O.

“…Applicability of a Gas Electron Multiplier (GEM) detector for the X-ray astronomy will be studied. The final goal of this feasibility study is to produce a…”
Get full text

Analysis of compounds released from various detector materials and their impact on aging Characteristics of proportional counters by Andersson, H., Andersson, T., Heino, J., Huovelin, J., Kurvinen, K., Lauhakangas, R., Nenonen, S., Numminen, A., Ojala, J., Orava, R., Schultz, J., Sipila, H., Vilhu, O.

“…Outgassing properties of various detector materials have been studied. The thermal desorption tube method was used for sampling the compounds released from the…”
Get full text

Scientific rationale for the D-CIXS X-ray spectrometer on board ESA's SMART-1 mission to the Moon by Dunkin, S.K, Grande, M, Casanova, I, Fernandes, V, Heather, D.J, Kellett, B, Muinonen, K, Russell, S.S, Browning, R, Waltham, N, Parker, D, Kent, B, Perry, C.H, Swinyard, B, Perry, A, Feraday, J, Howe, C, Phillips, K, McBride, G, Huovelin, J, Muhli, P, Hakala, P.J, Vilhu, O, Thomas, N, Hughes, D, Alleyne, H, Grady, M, Lundin, R, Barabash, S, Baker, D, Clark, P.E, Murray, C.D, Guest, J, d'Uston, L.C, Maurice, S, Foing, B, Christou, A, Owen, C, Charles, P, Laukkanen, J, Koskinen, H, Kato, M, Sipila, K, Nenonen, S, Holmstrom, M, Bhandari, N, Elphic, R, Lawrence, D

“…The D-CIXS X-ray spectrometer on ESA's SMART-1 mission will provide the first global coverage of the lunar surface in X-rays, providing absolute measurements…”
Get full text

Can a Relativistic Iron K Line Be Resolved in Cyg X-1 with SIXA? by Muhli, P, Vilhu, O

Get full text

Multisite observations of surface structures on AB Doradus in 1994 November by Collier Cameron, A., Walter, F. M., Vilhu, O., Böhm, T., Catala, C., Char, S., Clarke, F. J., Felenbok, P., Foing, B. H., Ghosh, K. K., Hao, J., Huang, L., Jackson, D. A., Janot-Pacheco, E., Jiang, S., Lagrange, A.-M., Suntzeff, N., Zhai, D. S.

“…We present time-resolved optical spectroscopy and broad-band photometry of the rapidly rotating southern K0 dwarf star AB Doradus, obtained during 1994…”
Get full text

The D-CIXS X-ray spectrometer, and its capabilities for lunar science by Grande, M, Dunkin, S, Heather, D, Kellett, B, Perry, C.H, Browning, R, Waltham, N, Parker, D, Kent, B, Swinyard, B, Fereday, J, Howe, C, Huovelin, J, Muhli, P, Hakala, P.J, Vilhu, O, Thomas, N, Hughes, D, Alleyne, H, Grady, M, Russell, S, Lundin, R, Barabash, S, Baker, D, Clark, P.E, Murray, C.D, Christou, A, Guest, J, Casanova, I, d'Uston, L.C, Maurice, S, Foing, B, Kato, M

“…The purpose of the D-CIXS (Demonstration of a Compact Imaging X-ray Spectrometer) instrument on the ESA SMART-1 mission is to provide high quality…”
Get full text

Jet interaction of SS 433 with the ambient medium by Durouchoux, Ph, Sood, R., Oka, T., Segers, M., Safi-Harb, S., Vilhu, O., Huovelin, J., Thresher, D., Corbel, S., O'Neill, P.

“…SS 433 is a bright X-ray binary with two sided jets moving at 0.26 c. It is located at the center of the supernova remnant W50, suggesting that SS 433 is…”
Get full text

The discovery of a new bright eclipsing AM Her system by Hakala, P. J., Watson, M. G., Vilhu, O., Hassall, B. J. M., Kellett, B. J., Mason, K. O., Piirola, V.

“…We report the optical identification of RE 2107 – 05, a new EUV source discovered in the ROSAT Wide Field Camera all-sky survey, and present the results of…”
Get full text

Multiwavelength Observation of a New Black Hole Candidate: EXS 1737.9–2952 by Durouchoux, Ph, Vilhu, O, Corbel, S, Wallyn, P, Dwarakanath, K. S, Huovelin, J, Anantharamaiah, K. R, Grindlay, J, Chapuis, C, Park, Y. S, Bally, J, Mahoney, W

Get full text

Magnetic braking in cataclysmic and low-mass X-ray binaries by VILHU, O

“…The chromospheric-coronal emission of lower Main-Sequence single and binary stars can be correlated with an activity parameter of type R - g(B - V)/P, where P…”
Get full text

Aging of proportional counters with gas mixtures containing impurities of aromatic hydrocarbons by Andersson, H., Andersson, T., Heino, J., Huovelin, J., Kurvinern, K., Lauhakangas, R., Nenonen, S., Numminen, A., Ojala, J., Orava, R., Schultz, J., Sipila, H., Vilhu, O.

“…The aging characteristics of some aromatic hydrocarbons and some other solvents with a ring like molecule structure are systematically studied. The…”
Get full text