Exploring the powering source of the TeV X-ray binary LS 5039 (2008)
Moldon, J., Ribo, M., Paredes, Josep M., Marti, J., Massi, M.
LS 5039 is one of the four TeV emitting X-ray binaries detected up to now. The powering source of its multi-wavelength emission can be accretion in a microquasar scenario or wind interaction in a...
A radio and near-infrared mini-survey of the MGRO J2019+37 complex (2008)
Paredes, J. M., Marti, J., Ishwara-Chandra, C. H., Sanchez-Sutil, J. R., Munoz-Arjonilla, A. J., Zabalza, V., ...
MGRO J2019+37 is an unidentified source of very high energy gamma-rays originally reported by the MILAGRO collaboration as the brightest TeV source in the Cygnus region. Despite the poor angular...
TeV Gamma-Ray Astrophysics (2008)
The window of TeV Gamma-Ray Astrophysics was opened less than two decades ago, when the Crab Nebula was detected for the first time. After several years of development, the technique used by imaging...
The changing milliarcsecond radio morphology of the gamma-ray binary LS 5039 (2008)
Ribo, M., Paredes, J. M., Moldon, J., Marti, J., Massi, M.
Context. LS 5039 is one of the few TeV emitting X-ray binaries detected so far. The powering source of its multiwavelength emission can be accretion in a microquasar scenario or wind interaction in a...
Observations of microquasars with the MAGIC telescope (2007)
Rico, J., Rissi, M., Bordas, P., Bosch-Ramon, V., Cortina, J., Paredes, J. M., ...
We report on the results from the observations in very high energy band (VHE, E_gamma > 100GeV) of the black hole X-ray binary (BHXB) Cygnus X-1. The observations were performed with the MAGIC...
Chandra Observations of the Gamma-ray Binary LSI+61303: Extended X-ray Structure? (2007)
Paredes, J. M., Ribo, M., Bosch-Ramon, V., West, J. R., Butt, Y. M., Torres, D. F., ...
We present a 50 ks observation of the gamma-ray binary LSI+61303 carried out with the ACIS-I array aboard the Chandra X-ray Observatory. This is the highest resolution X-ray observation of the source...
Kinematics of Black Hole X-ray Binary GRS 1915+105 (2007)
Dhawan, V., Mirabel, I. F., Ribo, M., Rodrigues, I.
The space velocity of a stellar black hole encodes the history of its formation and evolution. Here we measure the 3-dimensional motion of the microquasar GRS 1915+105, using a decade of astrometry...
Bel, M. Cadolle, Ribo, M., Rodriguez, J., Chaty, S., Corbel, S., Goldwurm, A., ...
We report the results of simultaneous multiwavelength observations of the X-ray transient source SWIFT J1753.5-0127 performed with INTEGRAL, RXTE, NTT, REM and VLA on 2005 August 10-12. The source,...
Exploring the connection between the stellar wind and the non-thermal emission in LS 5039 (2007)
Bosch-Ramon, V., Motch, C., Ribo, M., De Oliveira, R. Lopes, Janot-Pacheco, E., Negueruela, I., ...
LS 5039 has been observed with several X-ray instruments so far. The source presents X-ray variability at orbital timescales in flux and photon index. The system harbors an O-type main sequence star...
Chandra Observations of the Gamma-ray Binary LSI+61303: Extended X-ray Structure? (2007)
Paredes, Josep M., Ribo, M., Bosch-Ramon, ValentÃ, West, Jennifer R., Butt, Yousaf M., Torres, Diego F., ...
We present a 50 ks observation of the gamma-ray binary LSI+61303 carried out with the ACIS-I array aboard the Chandra X-ray Observatory. This is the highest resolution X-ray observation of the source...
Bel, M. Cadolle, Ribo, M., Rodriguez, J., Chaty, S., Corbel, S., Goldwurm, A., ...
We report the results of simultaneous multiwavelength observations of the X-ray transient source SWIFT J1753.5-0127 performed with INTEGRAL, RXTE, NTT, REM and VLA on 2005 August 10-12. The source,...
INTEGRAL serendipitous detection of the gamma-ray microquasar LS 5039 (2006)
Goldoni, P., Ribo, M., Di Salvo, T., Paredes, J. M., Bosch-Ramon, V., Rupen, M.
LS 5039 is the only X-ray binary persistently detected at TeV energies by the Cherenkov HESS telescope. It is moreover a gamma-ray emitter in the GeV and possibly MeV energy ranges. To understand...
INTEGRAL serendipitous detection of the gamma-ray microquasar LS 5039 (2006)
Goldoni, P., Ribo, M., Di Salvo, T., Paredes, J. M., Bosch-Ramon, V., Rupen, M.
LS 5039 is the only X-ray binary persistently detected at TeV energies by the Cherenkov HESS telescope. It is moreover a gamma-ray emitter in the GeV and possibly MeV energy ranges. To understand...
Safi-Harb, S., Ribo, M., Butt, Y., Matheson, H., Negueruela, I., Lu, F., ...
1WGA J1346.5-6255 is a ROSAT X-ray source found within the radio lobes of the supernova remnant (SNR) G309.2-00.6. This source also appears to coincide with the bright and early-type star HD 119682,...
Ribo, M., Negueruela, I., Blay, P., Torrejon, J. M., Reig, P.
Massive X-ray binaries are usually classified depending on the properties of the donor star in classical, supergiant and Be X-ray binaries. The massive X-ray binary 4U 2206+54 does not fit in any of...
A possible black hole in the gamma-ray microquasar LS 5039 (2005)
Casares, J., Ribo, M., Ribas, I., Paredes, J. M., Marti, J., Herrero, A.
The population of high energy and very high energy gamma-ray sources, detected with EGRET and the new generation of ground-based Cherenkov telescopes, conforms a reduced but physically important...
Orbital X-Ray Variability of the Microquasar LS 5039 (2005)
Bosch-Ramon, V., Paredes, J. M., Ribo, M., Miller, J. M., Reig, P., Marti, J.
The properties of the orbit and the donor star in the high mass X-ray binary microquasar LS 5039 indicate that accretion processes should mainly occur via a radiatively driven wind. In such a...
Blay, P., Ribo, M., Negueruela, I., Torrejon, J. M., Reig, P., Camero, A., ...
The majority of High Mass X-ray Binaries (HMXBs) behave as X-ray pulsars, revealing that they contain a magnetised neutron star. Among the four HMXBs not showing pulsations, and that do not show the...
The asymmetric compact jet of GRS 1915+105 (2004)
Ribo, M., Dhawan, V., Mirabel, I. F.
We present multiepoch VLBA observations of the compact jet of GRS 1915+105 conducted at 15.0 and 8.4 GHz during a {\it plateau} state of the source in 2003 March-April. These observations show that...
Optical polarimetric observations of the microquasar LS 5039 (2004)
Combi, J. A., Cellone, S. A., Marti, J., Ribo, M., Mirabel, I. F., Casares, J.
We present the first optical polarimetric observations of the runaway microquasar LS 5039. Our results reveal the presence of a large amount (~5%) of polarized emission towards this binary system. By...
Ribo, M., Combi, J. A., Mirabel, I. F.
The discovery of the microquasar LS 5039 well within the 95% conficence contour of the Unidentified EGRET Source (UES) 3EG J1824-1514 was a major step towards the possible association between...
On the nature of the unidentified X-ray/gamma-ray sources IGR J18027-1455 and IGR J21247+5058 (2004)
Combi, J. A., Ribo, M., Mirabel, I. F.
We present a multiwavelength study of the environment of the unidentified X-ray/gamma-ray sources IGR J18027-1455 and IGR J21247+5058, recently discovered by the IBIS/ISGRI instrument, onboard the...
Multi-wavelength INTEGRAL NEtwork (MINE) observations of the microquasar GRS 1915+105 (2004)
Fuchs, Yael, Rodriguez, J., Shaw, S. E., Kretschmar, P., Ribo, M., Chaty, S., ...
We present the international collaboration MINE (Multi-lambda Integral NEtwork) aimed at conducting multi-wavelength observations of X-ray binaries and microquasars simultaneously with the INTEGRAL...
Multiresolution approach for period determination on unevenly sampled data (2004)
Otazu, X., Ribo, M., Paredes, J. M., Peracaula, M., Nunez, J.
In this paper we present a multiresolution-based method for period determination that is able to deal with unevenly sampled data. This method allows us to detect superimposed periodic signals with...
I partially review our current knowledge on microquasars, making special emphasis on radio interferometric observations, and I comment on emerging trends in this field of astrophysics.
Results of a search for new microquasars in the Galaxy (2004)
Ribo, M., Paredes, J. M., Marti, J., Casares, J., Bloom, J. S., Falco, E. E., ...
We present here the results of a search for new microquasars at low galactic latitudes, based on a cross-identification between the ROSAT all sky Bright Source Catalog (RBSC) and the NRAO VLA Sky...
The dust-enshrouded microquasar candidate AX J1639.0-4642 = IGR J16393-4643 (2004)
Combi, J. A., Ribo, M., Mirabel, I. F., Sugizaki, M.
We present a multiwavelength study of the field containing the unidentified X-ray source AX J1639.0-4642, discovered with the ASCA observatory and recently detected with the IBIS telescope, onboard...
A search for microquasar candidates at low galactic latitudes (2004)
Paredes, J. M., Ribo, M., Marti, J.
Recent studies of relativistic jet sources in the Galaxy, also known as microquasars, have been very useful in trying to understand the accretion/ejection processes that take place near compact...
EVN and MERLIN observations of microquasar candidates at low galactic latitudes (2004)
Ribo, M., Ros, E., Paredes, J. M., Massi, M., Marti, J.
In an attempt to increase the number of known microquasars, Paredes et al. (2002) have presented a long-term project focused on the search for new objects of this type. They performed a...
Optical spectroscopy of microquasar candidates at low galactic latitudes (2004)
Marti, J., Paredes, J. M., Bloom, J. S., Casares, J., Ribo, M., Falco, E. E.
We report optical spectroscopic observations of a sample of 6 low-galactic latitude microquasar candidates selected by cross-identification of X-ray and radio point source catalogs for |b|
Simultaneous multi-wavelength observations of microquasars (the MINE collaboration) (2003)
Fuchs, Yael, Rodriguez, J., Mirabel, I. F., Shaw, S. E., Kretschmar, P., Ribo, M., ...
We present the international collaboration MINE (Multi-lambda INTEGRAL NEtwork) aimed at conducting multi-wavelength observations of microquasars simultaneously with the INTEGRAL satellite. The first...
Hints for a fast precessing relativistic radio jet in LS I +61 303 (2003)
Massi, M., Ribo, M., Paredes, J. M., Garrington, S. T., Peracaula, M., Marti, J.
Here we discuss two consecutive MERLIN observations of the X-ray binary LS I +61 303. The first observation shows a double-sided jet extending up to about 200 AU on both sides of a central source....
Fuchs, Yael, Rodriguez, J., Chaty, S., Ribo, M., Mirabel, I. F., Dhawan, V., ...
We present the international collaboration MINE (Multi-lambda Integral NEtwork) aimed at conducting multi-wavelength observations of X-ray binaries and microquasars simultaneously with INTEGRAL. The...
Simultaneous multi-wavelength observations of GRS 1915+105 (2003)
Fuchs, Yael, Rodriguez, J., Mirabel, I. F., Chaty, S., Ribo, M., Dhawan, V., ...
We present the result of multi-wavelength observations of the microquasar GRS 1915+105 in a plateau state with a luminosity of ~7.5x10^{38) erg s-1 (~40% L_Edd), conducted simultaneously with the...
Long-term X-ray variability of the microquasar system LS 5039/RX J1826.2-1450 (2003)
Reig, P., Ribo, M., Paredes, J. M., Marti, J.
We report on the results of the spectral and timing analysis of a BeppoSAX observation of the microquasar system LS 5039/RX J1826.2-1450. The source was found in a low-flux state with Fx(1-10 keV)=...
On the origin of the X-ray emission from a narrow-line radioquasar at z>1 (2003)
Barcons, X., Carballo, R., Carrera, F. J., Ceballos, M. T., Gonzalez-Serrano, J. I., Paredes, J. M., ...
We present new XMM-Newton X-ray observations of the z=1.246 narrow-line radioquasar RX J1011.2+5545 serendipitously discovered by ROSAT. The flat X-ray spectrum previously measured by ROSAT and ASCA...
VLA multifrequency observations of RS CVn binaries (2003)
Garcia-Sanchez, J., Paredes, J. M., Ribo, M.
We present multiepoch Very Large Array (VLA) observations at 1.4 GHz, 4.9 GHz, 8.5 GHz and 14.9 GHz for a sample of eight RS CVn binary systems. Circular polarization measurements of these systems...
Combi, J. A., Romero, G. E., Paredes, J. M., Torres, D. F., Ribo, M.
We report the discovery of a new radio galaxy within the location error box of the gamma-ray source 3EG J1735-1500. The galaxy is a double-sided jet source forming a large angle with the line of...
Confirmation of persistent radio jets in the microquasar LS 5039 (2002)
Paredes, J. M., Ribo, M., Ros, E., Marti, J., Massi, M.
We present here new observations conducted with the EVN and MERLIN of the persistent microquasar LS 5039 discovered by Paredes et al. (2000) with the VLBA. The new observations confirm the presence...
EVN and MERLIN confirmation of the LS5039 jets (2002)
Paredes, J. M., Ribo, M., Ros, E., Marti, J., Massi, M.
The microquasar nature of LS5039 was revealed by May 1999 VLBA+VLA observations showing a two-sided jet at milliarcsecond scales. Here we present follow-up interferometric observations carried out...
Detection of superimposed periodic signals using wavelets (2002)
Otazu, X., Ribo, M., Peracaula, M., Paredes, J. M., Nunez, J.
In this paper we present a wavelet based algorithm that is able to detect superimposed periodic signals in data with low signal-noise ratio. In this context, the results given by classical period...
LS 5039: a runaway microquasar ejected from the galactic plane (2002)
Ribo, M., Paredes, J. M., Romero, G. E., Benaglia, P., Marti, J., Fors, O., ...
We have compiled optical and radio astrometric data of the microquasar LS 5039 and derived its proper motion. This, together with the distance and radial velocity of the system, allows us to state...
One-sided jet at milliarcsecond scales in LSI+61303 (2001)
Massi, M., Ribo, M., Paredes, J. M., Peracaula, M., Estalella, R.
We present Very Long Baseline Interferometry (VLBI) observations of the high mass X-ray binary LSI+61303, carried out with the European VLBI Network (EVN). Over the 11 hour observing run, performed...
Discovery of a High-Energy Gamma-Ray-Emitting Persistent Microquasar (2001)
Paredes, J. M., Marti, J., Ribo, M., Massi, M.
Microquasars are stellar x-ray binaries that behave as a scaled down version of extragalactic quasars. The star LS 5039 is a new microquasar system with apparent persistent ejection of relativistic...
Evidence of H alpha periodicities in LS I+61303 (1999)
Zamanov, R. K., Marti, J., Paredes, J. M., Fabregat, J., Ribo, M., Tarasov, A. E.
We present the results of analyzing H$\alpha$ spectra of the radio emitting X-ray binary LS I+61303. For the first time, the same 26.5 d radio period is clearly detected in the H$\alpha$ emission...
X-ray and radio observations of RX J1826.2-1450/LS 5039 (1999)
Ribo, M., Reig, P., Marti, J., Paredes, J. M.
RX J1826.2-1450/LS 5039 has been recently proposed to be a radio emitting high mass X-ray binary. In this paper, we present an analysis of its X-ray timing and spectroscopic properties using...