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41 papers · 2 filters
3D Spectroscopy of Herbig-Haro objects
R. Lopez, S. F. Sanchez, B. Garcia-Lorenzo +5
HH 110 and HH 262 are two Herbig-Haro jets with rather peculiar, chaotic morphology. In the two cases, no source suitable to power the jet has been detected along the outflow, at o…
Submillimeter emission from the hot molecular jet HH 211
A. Palau, P. T. P. Ho, Q. Zhang +7
We observed the HH 211 jet in the submillimeter continuum and the CO(3-2) and SiO(8-7) transitions with the Submillimeter Array. The continuum source detected at the center of the…
"Expansion" around the vacuum: how far can we go from Lambda?
J. S. Alcaniz, H. Stefancic
The cosmological constant (), i.e., the energy density stored in the true vacuum state of all existing fields in the Universe, is the simplest and the most natural possibility t…
Equation of state description of the dark energy transition between quintessence and phantom regimes
Hrvoje Stefancic
The dark energy crossing of the cosmological constant boundary (the transition between the quintessence and phantom regimes) is described in terms of the implicitly defined dark en…
A new radial system of dark globules in Monoceros
C. Carrasco-González, R. López, A. Gyulbudaghian +2
Aims. We analyze the LBN 978 HII region in order to study the HII/molecular cloud interaction. Methods. We used the IAC-80 telescope to image the region with narrow-band filters an…
The very low-mass population of the Corona Australis and Chamaeleon II star forming regions
Belén López Martí, Jochen Eislöffel, Reinhard Mundt
We present the results of a deep optical survey in the Corona Australis and Chamaeleon II star forming regions. Our optical photometry is combined with available near- and mid-infr…
The maximum contribution to reionization from metal-free stars
Jose M. Rozas, Jordi Miralda-Escude, Eduard Salvador-Sole
We estimate the maximum contribution to reionization from the first generation of massive stars, with zero metallicity, under the assumption that one of these stars forms with a fi…
X-RED: A Satellite Mission Concept To Detect Early Universe Gamma Ray Bursts
Mirko Krumpe, Deirdre Coffey, Georg Egger +14
Gamma ray bursts (GRBs) are the most energetic eruptions known in the Universe. Instruments such as Compton-GRO/BATSE and the GRB monitor on BeppoSAX have detected more than 2700 G…
Astrometric Light-Travel Time signature of sources in nonlinear motion
Guillem Anglada, Jordi Torra
Context:Very precise planned space astrometric missions and recent improvements on imaging capabilities require a detailed review of the assumptions of classical astrometric modeli…
First Determination of the Distance and Fundamental Properties of an Eclipsing Binary in The Andromeda Galaxy
Ignasi Ribas, Carme Jordi, Francesc Vilardell +3
We present the first detailed spectroscopic and photometric analysis of an eclipsing binary in the Andromeda Galaxy (M31). This is a 19.3-mag semi-detached system with components o…
The Calar Alto lunar occultation program: update and new results
A. Richichi, O. Fors, M. Merino +6
We present an update of the lunar occultation program which is routinely carried out in the near-IR at the Calar Alto Observatory. A total of 350 events were recorded since our las…
Relativistic effects on the imaging by a rotating optical system
G. Anglada-Escude, S. Klioner, M. Soffel +1
Context. High accuracy astrometric instruments like Gaia aiming at an accuracy of 1 microarcsecond cannot be considered as point-like observers in the framework of relativistic mod…
Spectra of High-Redshift Type Ia Supernovae and a Comparison with their Low-Redshift Counterparts
I. M. Hook, D. A. Howell, G. Aldering +32
We present spectra for 14 high-redshift (0.17 < z < 0.83) supernovae, which were discovered by the Supernova Cosmology Project as part of a campaign to measure cosmological paramet…
Spectral energy distribution of the gamma-ray microquasar LS 5039
J. M. Paredes, V. Bosch-Ramon, G. E. Romero
The microquasar LS 5039 has recently been detected as a source of very high energy (VHE) -rays. This detection, that confirms the previously proposed association of LS 5039 with…
A broadband leptonic model for gamma-ray emitting microquasars
V. Bosch-Ramon, G. E. Romero, J. M. Paredes
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 prese…
Very low-mass members of the Lupus 3 cloud
Belén López Martí, Jochen Eislöffel, Reinhard Mundt
We report on a multi-band survey for very low-mass stars and brown dwarfs in the Lupus 3 cloud with the Wide Field Imager (WFI) at the ESO/MPG 2.2m telescope on La Silla Observator…
The Arecibo Legacy Fast ALFA Survey: I. Science Goals, Survey Design and Strategy
Riccardo Giovanelli, Martha P. Haynes, Brian R. Kent
The recently initiated Arecibo Legacy Fast ALFA (ALFALFA) survey aims to map 7000 square degrees of the high galactic latitude sky visible from Arecibo, providing a HI line spectra…
Spectroscopy of twelve Type Ia supernovae at intermediate redshift
C. Balland, M. Mouchet, R. Pain +15
We present spectra of twelve Type Ia supernovae obtained in 1999 at the William Herschel Telescope and the Nordic Optical Telescope during a search for Type Ia supernovae (SN Ia) a…
Orbital X-Ray Variability of the Microquasar LS 5039
V. Bosch-Ramon, J. M. Paredes, M. Ribo +3
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…
Spectroscopic Observations and Analysis of the Unusual Type Ia SN 1999ac
The Supernova Cosmology Project, :, G. Garavini +55
We present optical spectra of the peculiar Type Ia supernova (SN Ia) 1999ac. The data extend from -15 to +42 days with respect to B-band maximum and reveal an event that is unusual…
A possible black hole in the gamma-ray microquasar LS 5039
J. Casares, M. Ribo, I. Ribas +3
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 physic…
Dynamical dark energy or variable cosmological parameters?
Joan Sola, Hrvoje Stefancic
One of the main aims in the next generation of precision cosmology experiments will be an accurate determination of the equation of state (EOS) for the dark energy (DE). If the lat…
GRB 021004 modelled by multiple energy injections
A. de Ugarte Postigo, A. J. Castro-Tirado, J. Gorosabel +43
GRB 021004 is one of the best sampled gamma-ray bursts (GRB) to date, although the nature of its light curve is still being debated. Here we present a large amount (107) of new opt…
Possible hot spots excited by the relativistic jets of Cygnus X-3
J. Marti, D. Perez-Ramirez, J. L. Garrido +2
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 b…