Non thermal emission from microquasar/ISM interaction (2008)
Bordas, P., Bosch-Ramon, V., Paredes, J. M., Perucho, M.
The interaction of microquasar jets with their environment can produce non-thermal radiation as is the case for extragalactic outflows impacting on their surroundings. We have developed an analytical...
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...
Gamma-ray emission from massive star forming regions (2008)
Araudo, A. T., Romero, G. E., Bosch-Ramon, V., Paredes, J. M.
Recent radio observations support a picture for star formation where there is accretion of matter onto a central protostar with the ejection of molecular outflows that can affect the surrounding...
VHE Gamma-rays from Galactic X-ray Binary Systems (2008)
The detection of TeV gamma-rays from LS 5039 and the binary pulsar PSR B1259-63 by HESS, and from LS I +61 303 and the stellar-mass black hole Cygnus X-1 by MAGIC, provides a clear evidence of very...
Radio detections towards unidentified variable EGRET sources (2008)
Paredes, J. M., Marti, J., Ishwara-Chandra, C. H., Torres, D. F., Romero, G. E., Combi, J. A., ...
Context. A considerable fraction of the gamma-ray sources discovered with the Energetic Gamma-Ray Experiment Telescope (EGRET) remain unidentified. The EGRET sources that have been properly...
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...
Faint arc-minute extended radio emission around Cygnus X-3 (2008)
Sanchez-Sutil, J. R., Marti, J., Combi, J. A., Luque-Escamilla, P., Munoz-Arjonilla, A. J., Paredes, J. M., ...
Aims. We revisit the vicinity of the microquasar Cygnus X-3 at radio wavelengths. We aim to improve our previous search for possible associated extended radio features/hot spots in the position angle...
Radio detections towards unidentified variable EGRET sources (2008)
Paredes, J. M., Marti, J., Ishwara-Chandra, C. H., Torres, D. F., Romero, G. E., Combi, J. A., ...
High Energy Phenomena in Relativistic Outflows, Part 2 (2008)
Aharonian, Felix, Rieger, Frank, Paredes, J. M., Romero, G. E.
High Energy Phenomena in Relativistic Outflows, Part 1 (2008)
Aharonian, Felix, Rieger, Frank, Paredes, J. M., Romero, G. E.
Leptonic secondary emission in a hadronic microquasar model (2007)
Orellana, M., Bordas, P., Bosch-Ramon, V., Romero, G. E., Paredes, J. M.
Context: It has been proposed that the origin of the very high-energy photons emitted from high-mass X-ray binaries with jet-like features, so-called microquasars (MQs), is related to hadronic...
Synchrotron emission from secondary leptons in microquasar jets (2007)
Bordas, P., Paredes, J. M., Bosch-Ramon, V., Orellana, M.
We present a model to estimate the synchrotron radio emission generated in microquasar (MQ) jets due to secondary pairs created via decay of charged pions produced in proton-proton collisions between...
The MAGIC Project: Contributions to ICRC 2007 (2007)
Albert, J., Aliu, E., Anderhub, H., Antoranz, P., Armada, A., Baixeras, C., ...
The MAGIC Project: Contributions to ICRC 2007, Merida, Mexico. Contents pages for the Contribution on behalf of the MAGIC Collaboration to the 30th ICRC that took place in July 2007 in Merida,...
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...
Gamma-ray emission from massive young stellar objects (2007)
Araudo, A. T., Romero, G. E., Bosch-Ramon, V., Paredes, J. M.
Massive stars form in dense and massive molecular cores. The exact formation mechanism is unclear, but it is possible that some massive stars are formed by processes similar to those that produce the...
Probing Quantum Gravity using Photons from a Mkn 501 Flare Observed by MAGIC (2007)
Albert, J, Aliu, E, Anderhub, H, Antoranz, P, Baixeras, C, Barrio, J A, ...
We use the timing of photons observed by the MAGIC gamma-ray telescope during a flare of the active galaxy Markarian 501 to probe a vacuum refractive index ~ 1-(E/M_QGn)^n, n = 1,2, that might be...
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...
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...
Gamma-ray emission from massive young stellar objects (2007)
Araudo, A. T., Romero, G. E., Bosch-Ramon, V., Paredes, J. M.
Context: Massive stars form in dense and massive molecular cores. The exact formation mechanism is unclear, but it is possible that some massive stars are formed by processes similar to those that...
Leptonic secondary emission in a hadronic microquasar model (2007)
Orellana, M., Bordas, P., Bosch-Ramon, V., Romero, G. E., Paredes, J. M.
Context: It has been proposed that the origin of the very high-energy photons emitted from high-mass X-ray binaries with jet-like features, so-called microquasars (MQs), is related to hadronic...
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...
On the multiwavelength spectrum of the microquasar 1E 1740.7-2942 (2006)
Bosch-Ramon, V., Romero, G. E., Paredes, J. M., Bazzano, A., Del Santo, M., Bassani, L.
Context. The microquasar 1E 1740.7-2942 is a source located in the direction of the Galactic Center. It has been detected at X-rays, soft gamma-rays, and in the radio band, showing an extended radio...
High-energy gamma-ray emission in AGNs and microquasars (2006)
I review here some of the main observational features in microquasars and AGNs as sources of high-energy gamma-rays as well as some of the current models that try to explain the emission in the...
New results on the microquasar LS 5039 (2006)
J. Martí, J.M. Paredes, J. Casares, C. Zurita, M. Ribó
New results on the microquasar LS 5039
Bipolar relativistic ejections in Cygnus X-3 (2006)
J. Martí, J.M. Paredes, M. Peracaula
Bipolar relativistic ejections in Cygnus X-3
Radio to TeV radiation initiated by termination of hadronic jets from microquasars in the ISM (2006)
Bosch-Ramon, V., Aharonian, F. A., Paredes, J. M.
Microquasars (MQs) are potential candidates to produce a non-negligible fraction of the observed galactic cosmic rays. The protons accelerated at the jet termination shock interact with the...
Spectral and variability properties of LS 5039 from radio to very high-energy gamma-rays (2006)
Bosch-Ramon, V., Paredes, J. M., Romero, G. E.
Microquasars are X-ray binaries with relativistic jets. The microquasar LS 5039 turned out to be the first high-energy gamma-ray microquasar candidate due to its likely association with the EGRET...
Leptonic emission from microquasar jets: from radio to very high-energy gamma-rays (2006)
Bosch-Ramon, V., Paredes, J. M., Romero, G. E.
Microquasars are sources of very high-energy gamma-rays and, very probably, high-energy gamma-ray emitters. We propose a model for a jet that can allow to give accurate observational predictions for...
A radio and infrared exploration of the Cygnus X-3 environments (2006)
Marti, J., Perez-Ramirez, D., Luque-Escamilla, P., Garrido, J. L., Paredes, J. M., Munoz-Arjonilla, A. J., ...
To confirm, or rule out, the possible hot spot nature of two previously detected radio sources in the vicinity of the Cygnus X-3 microquasar. We present the results of a radio and near infrared...
A microquasar model applied to unidentified gamma-ray sources (2006)
Bosch-Ramon, V., Paredes, J. M., Romero, G. E., Torres, D. F.
Among unidentified gamma-ray sources in the galactic plane, there are some that present significant variability and have been proposed to be high-mass microquasars. To deepen the study of the...
INTEGRAL and XMM-Newton observations towards the unidentified MeV source GRO J1411-64 (2006)
Torres, D. F., Zhang, S., Reimer, O., Barcons, X., Corral, A., Bosch-Ramon, V., ...
A broadband leptonic model for gamma-ray emitting microquasars (2005)
Bosch-Ramon, V., Romero, G. E., Paredes, J. M.
Observational and theoretical studies point to microquasars (MQs) as possible counterparts of a significant fraction of the unidentified gamma-ray sources detected so far. At present, a proper...
Spectral energy distribution of the gamma-ray microquasar LS 5039 (2005)
Paredes, J. M., Bosch-Ramon, V., Romero, G. E.
The microquasar LS 5039 has recently been detected as a source of very high energy (VHE) $\gamma$-rays. This detection, that confirms the previously proposed association of LS 5039 with the EGRET...
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...
Broad-band electromagnetic radiation from microquasars interacting with ISM (2005)
Bosch-Ramon, V., Aharonian, F. A., Paredes, J. M.
Microquasars (MQs) are galactic objects with relativistic jets that constitute a source population which can be responsible for production of a non-negligible fraction of the observed galactic cosmic...
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...
Possible hot spots excited by the relativistic jets of Cygnus X-3 (2005)
Marti, J., Perez-Ramirez, D., Garrido, J. L., Luque-Escamilla, P., Paredes, J. M.
We present the results of a deep search for associated radio features in the vicinity of the microquasar Cygnus X-3. The motivation behind is to find out evidence for interaction between its...
Orbital Parameters of the Microquasar LSI +61 303 (2005)
Casares, J., Ribas, I., Paredes, J. M., Marti, J., Prieto, C. Allende
New optical spectroscopy of the HMXB microquasar LSI +61 303 is presented. Eccentric orbital fits to our radial velocity measurements yield updated orbital parameters in good agreement with previous...
The periodic microquasar LS I+61°303 in the radio and gamma-ray bands (2005)
Massi, M., Ribó, M., Paredes, J. M., Garrington, S. T., Peracaula, M., Martí, J.
The gamma-ray emitting microquasar LS I +61 303 (2005)
Massi, M., Ribó, M., Paredes, J. M., Garrington, S. T., Peracaula, M., Martí, J.
Electromagnetic radiation initiated by hadronic jets from microquasars in the ISM (2005)
Bosch-Ramon, Valenti, Aharonian, Felix, Paredes, J. M.
Microquasars are potential candidates to produce a non-negligible fraction of the observed galactic cosmic rays. The protons accelerated at the jet termination shock interact with the interstellar...
Broad-band electromagnetic radiation from microquasars interacting with ISM (2005)
Bosch-Ramon, Valenti, Aharonian, Felix, Paredes, J. M.
Microquasars (MQs) are galactic objects with relativistic jets that constitute a source population which can be responsible for production of a non-negligible fraction of the observed galactic cosmic...
Electromagnetic radiation initiated by hadronic jets from microquasars in the ISM (2004)
Bosch-Ramon, V., Aharonian, F. A., Paredes, J. M.
Microquasars are potential candidates to produce a non-negligible fraction of the observed galactic cosmic rays. The protons accelerated at the jet termination shock interact with the interstellar...
High-energy gamma-ray Emission from Microquasars: LS 5039 and LS I +61 303 (2004)
Bosch-Ramon, V., Paredes, J. M.
The possible associations between the microquasars LS 5039 and LS I +61 303 and the EGRET sources 3EG J1824-1514 and 3EG J0241+6103 suggest that microquasars could also be sources of high-energy...
The gamma-ray emitting microquasar LSI+61303 (2004)
Massi, M., Ribo', M., Paredes, J. M., Garrington, S. T., Peracaula, M., Marti', J.
LS I +61 303 is one of the most studied X-ray binary systems because of its two peculiarities: On the one hand being the probable counterpart of the variable gamma ray source 2CG 135+01 (Gregory and...
Particle Injection in the Cir X-1 radio outbursts (2004)
Sanchez, J. G., Paredes, J. M.
A particle injection model has been applied to the radio outbursts of the X-ray binary Circinus X-1. The radio outbursts of this system have often been observed to exhibit a double peaked structure,...
Microquasar models for 3EG J1828+0142 and 3EG J1735-1500 (2004)
Bosch-Ramon, V., Paredes, J. M., Romero, G. E., Torres, D. F.
Microquasars are promising candidates to emit high-energy gamma-rays. Moreover, statistical studies show that variable EGRET sources at low galactic latitudes could be associated with the inner...
Identifying variable gamma-ray sources through radio observations (2004)
Paredes, J. M., Marti, J., Torres, D. F., Romero, G. E., Combi, J. A., Bosch-Ramon, V., ...
We present preliminary results of a campaign undertaken with different radio interferometers to observe a sample of the most variable unidentified EGRET sources. We expect to detect which of the...
High-mass microquasars and low-latitude gamma-ray sources (2004)
Bosch-Ramon, V., Romero, G. E., Paredes, J. M.
Population studies of unidentified EGRET sources suggest that there exist at least three different populations of galactic gamma-ray sources. One of these populations is formed by young objects...
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...
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...
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|
A numerical model for the gamma-ray emission of the microquasar LS 5039 (2004)
Bosch-Ramon, V., Paredes, J. M.
The possible association between the microquasar LS 5039 and the EGRET source 3EG J1824-1514 suggests that microquasars could also be sources of high energy gamma-rays. In this paper, we explore,...
Hints for a fast precessing relativistic radio jet in LS I+61° 303 (2004)
Massi, M., Ribó, M., Paredes, J. M., Garrington, S. T., Peracaula, M., Marti, J.
Results of a search for new microquasars in the Galaxy (2004)
Ribó, M., Paredes, J. M., Martí, J., Casares, J., Bloom, J. S., Falco, E. E., ...
Results of a search for new microquasars in the galaxy (2004)
Bloom , J. S., Casares , J., Falco , E. E., Martí , J., Massi , M., Paredes , J.M., ...
We present here the results of a search for new microquasars at low galactic latitudes, based on a cross- identi cation between the ROSAT all sky Bright Source Catalog (RBSC) and the NRAO VLA Sky...
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....
RevMexAA (Serie de Conferencias), 14, 55--55 (2002) (2003)
J. M. Paredes, J. Casares, C. Zurita
MERLIN observations (not shown here) at the same epoch also resolve the source, and show that the jets extend up to 200 mas. These results seem to confirm the persistent nature of the jets in LS...
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)=...
RevMexAA (Serie de Conferencias), 14, 55--55 (2002) (2003)
J. M. Paredes, J. Casares, C. Zurita, J. Mart
ervations (not shown here) at the same epoch also resolve the source, and show that the jets extend up to 200 mas. These results seem to confirm the persistent nature of the jets in LS 5039. At...
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...
Subarcsecond radio structure of LS I+61 303 (2003)
Massi, M., Ribó, M., Paredes, J. M., Peracaula, M., Martí, J., Garrington, S. T.
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...