Revisiting 2D Numerical Models for the 19th century outbursts of $\eta$ Carinae (2009)
González, R. F., Villa, A. M., Gómez, G. C., Raga, A. C., Cantó, J., ...
We present here new results of two-dimensional hydrodynamical simulations of the eruptive events of the 1840s (the great) and the 1890s (the minor) eruptions suffered by the massive star $\eta$ Car....
The angular momentum of condensations within elephant trunks (2009)
Lora, V., Raga, A. C., Esquivel, A.
The radiation from newly born stars photoevaporates their parental neutral cloud, leading to the formation of dense clumps that will eventually form stars. We present 3D simulations of the...
Low and high velocity clouds produced by young stellar clusters (2009)
Rodriguez-Gonzalez, A., Raga, A. C., Canto, J.
Intermediate and high velocity HI clouds rain onto the plane of our Galaxy. They are observed at heights of between 500 and 1500 pc, falling onto the Galactic plane at velocities from 50 to 140 km...
Photoionized mixing layer models of the diffuse ionized gas (2009)
Binette, L., Flores-Fajardo, N., Raga, A. C., Drissen, L., Morisset, C.
It is generally believed that O stars, confined near the galactic midplane, are somehow able to photoionize a significant fraction of what is termed the "diffuse ionized gas" (DIG) of spiral...
Kinematics of the H2O masers at the centre of the PN K3-35 (2008)
Uscanga, L., Gómez, Y., Raga, A. C., Cantó, J., Anglada, G., Gómez, J. F., ...
We have studied the kinematics traced by the water masers located at the centre of the planetary nebula (PN) K3-35, using data from previous Very Large Array (VLA) observations. An analysis of the...
Models for the infrared cavity of HH 46/47 (2008)
Raga, A. C., Noriega-Crespo, A., Gonzalez, R. F., Velazquez, P. F.
We have modeled the limb-brightened cavity seen in the new Spitzer Space Telescope IR images of the southwest lobe of HH 46/47 as the bow shock driven by an outflow from a young, low-mass star. We...
The formation of filamentary structures in radiative cluster winds (2008)
Rodr'iguez-Gonz'alez, A., Esquivel, A., Raga, A. C., Cant'o, J.
We explore the dynamics of a ``cluster wind'' flow in the regime in which the shocks resulting from the interaction of winds from nearby stars are radiative. We first show that for a cluster with T...
A latitude-dependent wind model for Mira's cometary head (2008)
Raga, A. C., Cantó, J., De Colle, F., Esquivel, A., Kajdic, P., Rodríguez-González, A., ...
We present a 3D numerical simulation of the recently discovered cometary structure produced as Mira travels through the galactic ISM. In our simulation, we consider that Mira ejects a steady,...
Diagnostics of inhomogeneous stellar jets: Convolution effects and data reconstruction (2008)
De Colle, F., Del Burgo, C., Raga, A. C.
CONTEXT: In the interpretation of stellar jet observations, the physical parameters are usually determined from emission line ratios, obtained from spectroscopic observations or using the information...
RevMexAA (Serie de Conferencias), 14, 100--100 (2002) (2008)
Laser Laboratory Experiments, P. F. Velázquez, A. C. Raga, H. Sobral, M. Rosado, ...
es the experimental shadowgrams (e.g. the radio-continuum and [OIII] images of the SNR DEM L316, Murphy-Williams et al. 1997) The yguazu-a code was also employed for studying the SNR 3C400.2. This...
The interaction of a yso outflow with the surrounding molecular cloud core (2008)
A. C. Raga, D. A. Williams, J. Cantó
Presentamos un modelo analtico de capa delgada para un ujo eyectado con un angulo de apertura que crece en funcion del tiempo. Este modelo predice una cavidad que se ensancha con el tiempo, y que se...
A long-slit, high resolution spectrum of the HH 30 jet (2007)
Raga Opez Riera, A. C. Raga, A. Riera, R. Estalella, G. Anglada
The HH 30 jet has been observed quite extensively in the past. This paper is an addition to the HH 30 data set, presenting a new long-slit, high resolution spectrum (including the Hff and red [N II]...
INTERPRETING THE PROPER MOTIONS OF THE HH 34S BOWSHOCK (2007)
A. C. Raga, P. F. Velázquez, J. Cantó, E. Masciadri
Reipurth et al. (2002) han obtenido movimientos propios muy detallados del choque a proa HH 34S usando imágenes obtenidas con el Hubble Space Telescope (HST). Encontramos que estos movimientos...
THE THEORY OF PHOTOIONIZED JETS (2007)
A. C. Raga, L. López-martín, J. A. López, Autónoma México, J. Meaburn
En un artículo anterior, hemos discutido la fotoionización de un jet Herbig-Haro (HH) inmerso en una región H II. Aquí presentamos nuevos cálculos de un jet HH fotoionizado eyectado por una...
HH 111 LINE RATIOS FROM STIS SPECTRA (2007)
A STIS spectrum of the HH 111 Herbig-Haro jet has recently been obtained. We have used this spectrum to calculate line ratios as a function of position along the jet. These line ratios show the...
THE TRANSVERSE VELOCITY STRUCTURE OF THE HH 111 JET (2007)
A. Riera, R. López, A. C. Raga, G. Anglada, R. Estalella
Presentamos espectroscopía de rendija larga del jet HH 111, obtenida con el telescopio William Herschel, de 4.2 m de diámetro. Hemos obtenido espectros con posiciones de la rendija a lo largo y a...
A. C. Raga, H. Sobral, M. Rosado, M. Villagr'an Muniz
We have employed the yguaz'u-a code to simulate the interaction of two strong explosions, which were generated by means of focusing the beams of two Nd:YAG lasers in air. We also applied this...
MODELING THE RADIAL VELOCITIES AND PROPER MOTIONS OF HERBIG-HARO OBJECTS (2007)
A. C. Raga, P. F. Velazquez, E. Masciadri
Este artculo discute los diferentes metodos que han sido usados para modelar la emision de objetos HerbigHaro (HH). Aunque simulaciones axisimetricas y 3D han sido realizadas para modelar objetos...
We present an analytic model describing the “ “ cluster wind ÏÏ Ñow that results from the multiple interaction of the stellar winds produced by the stars of a dense cluster of massive stars....
Revmexaa Serie De, E. Masciadri, A. C. Raga
otion coexist but that the temporal scale of the observed wiggles are sometimes of the same order of magnitude as the period o of an orbital motion ( o 9 to 100 yr) and not of the period p of a...
RevMexAA (Serie de Conferencias), 9, 230--231 (2000) (2007)
Observations Of Jets, L. López-martín, A. C. Raga, J. A. López, Autónoma México, J. Meaburn
We present high resolution long-slit spectra of HH 444 and numerical simulations for this Herbig-Haro object. From the comparison between observations and simulations we are able to study the...
Revmexaa Serie De, A. Riera, A. C. Raga, G. Anglada
H 110 jet, at the postions of knots B, C, I+J, and P. We nd that the HH 110 jet has a very complex structure, with spatially dependent radial velocities, line intensities and line ratios. The radial...
Revista Mexicana de Astronoma y Astrofsica, 39, 55--67 (2003) (2007)
Relation Between Source, L. Binette, P. Ferruit, W. Steffen, A. C. Raga
The magnitude of the temperature fluctuations (t ) required to explain the observed inconsistencies between metallicities inferred from recombination lines and from forbidden lines cannot be attained...
RevMexAA (Serie de Conferencias), 9, 230-231 (2000) (2007)
Observations Of Jets, A. C. Raga, J. A. Lopez, J. Meaburn
We present high resolution long-slit spectra of HH 444 and numerical simulations for this Herbig-Haro object. From the comparison between observations and simulations we are able to study the...
RevMexAA (Serie de Conferencias), 10, 61--64 (2001) (2007)
Theory And Observations, L. López-martín, A. C. Raga, J. A. López, J. Meaburn
The discovery of a system of Herbig--Haro objects ejected by young, low mass stars in the # Orionis region (Reipurth et al. 1998) has given rise to models of the photoionization of a neutral jet by...
Revmexaa Serie De, A. C. Raga, P. F. Velazquez, A. Noriega-crespo, P. Mininni
This paper rst reviews the literature of entrainment of molecular material into HH jets. The available models can, in principle, reproduce the H 2 emission of a number of HH objects. However, there...
S. Ayala, A. C. Raga, S. Curiel
in length and consists of numerous knots forming the ow. Noriega-Crespo et al. (1996) found that the turbulent optical and near-infrared morphology of the HH 110 jet is consistent with that of a...
A. C. Raga, P. F. Velazquez, E. Masciadri
Reipurth et al. (2002) han obtenido movimientos propios muy detallados del choque a proa HH 34S usando imagenes obtenidas con el Hubble Space Telescope (HST). Encontramos que estos movimientos...
Revmexaa Serie De, A. Riera, R. López, A. C. Raga, R. Estalella, G. Anglada
jet, at the postions of knots B, C, I+J, and P. We find that the HH 110 jet has a very complex structure, with spatially dependent radial velocities, line intensities and line ratios. The radial...
RevMexAA (Serie de Conferencias), 13, 79--82 (2002) (2007)
Modeling The Radial, A. C. Raga, P. F. Velázquez, J. Cantó, E. Masciadri
This paper discusses the di#erent approaches that have been used for modeling the emission of Herbig-Haro (HH) objects. Even though axisymmetric or 3D simulations have been carried out for modeling...
Revmexaa Serie De, P. F. Velazquez, J. Martinell, A. C. Raga
Several physical mechanisms have been studied in order to explain why composite supernova remnants (SNRs) have shell-like morphologies in radio continuum while their X-ray emission is centrally...
RevMexAA (Serie de Conferencias), 10, 61-64 (2001) (2007)
Theory And Observations, A. C. Raga, J. A. Lopez, J. Meaburn
The discovery of a system of Herbig{Haro objects ejected by young, low mass stars in the Orionis region (Reipurth et al. 1998) has given rise to models of the photoionization of a neutral jet by an...
RevMexAA (Serie de Conferencias), 12, 168-168 (2002) (2007)
Unveiling The Structure, J. A. Lopez, A. C. Raga, L. F. Miranda, J. M. Torrelles, J. Meaburn
polar region presents a heliocentric expansion velocity of 50 kms . 2. We propose that the knots around the bipolar core are forming two slow expanding arcs. 3. We con rm that the structure s1 is the...
Revmexaa Serie De, P. F. Velázquez, J. Martinell, A. C. Raga, Autónoma México
Several physical mechanisms have been studied in order to explain why composite supernova remnants (SNRs) have shell-like morphologies in radio continuum while their X-ray emission is centrally...
Winds from clu\sters with non-uniform stellar distributions (2007)
Rodríguez-González, Ary, Cantó, J., Esquivel, A., Raga, A. C., Velazquez, P. F.
We present analytic and numerical models of the `cluster wind' resulting from the multiple interactions of the winds ejected by the stars of a dense cluster of massive stars. We consider the case in...
The Structure of the Inner HH 34 Jet from Optical Integral Field Spectroscopy (2006)
Beck, Tracy L., Riera, A., Raga, A. C., Reipurth, Bo
We present high spatial resolution optical integral field spectroscopy of a collimated Herbig-Haro jet viewed nearly edge-on. Maps of the line emission, velocity centroid, and velocity dispersion...
Shadows and photoevaporated flows from neutral clumps exposed to two ionizing sources (2006)
A. C. Raga, J. Cantó, A. H. Cerqueira, M. J. Vasconcelos
Shadows and photoevaporated flows from neutral clumps exposed to two ionizing sources
Emission line ratios from variable velocity jet models (2006)
A. C. Raga, P. F. Velázquez, P. Kajdic
Emission line ratios from variable velocity jet models
Effects of Anisotropic Thermal Conduction on X-Ray Emission from SNRS (2006)
A. C. Raga, P. F. Velázquez, J. Martinell
Effects of Anisotropic Thermal Conduction on X-Ray Emission from SNRS
Entrainment in Herbig-Haro Objects (2006)
A. C. Raga, P. F. Velázquez, A. Noriega Crespo, P. Mininni
Entrainment in Herbig-Haro Objects
An Optical Spectroscopic Study of HH 110: a Turbulent Mixing Layer? (2006)
A. C. Raga, S. Curiel, S. Ayala
An Optical Spectroscopic Study of HH 110: a Turbulent Mixing Layer?
Herbig-Haro Objects from Orbiting Sources (2006)
Herbig-Haro Objects from Orbiting Sources
The Transverse Velocity Structure of HH Jets (2006)
R. López, A. Riera, A. C. Raga, G. Anglada, R. Estalella
The Transverse Velocity Structure of HH Jets
Modeling the radial velocities and proper motions of herbig-haro objects (2006)
E. Masciadri, A. C. Raga, J. Cantó, P. F. Velázquez
Modeling the radial velocities and proper motions of herbig-haro objects
Unveiling the structure of the planetary nebula M2-48 (2006)
J. Meaburn, A. C. Raga, J. M. Torrelles, J. A. López, C. Esteban, L. López Martín, ...
Unveiling the structure of the planetary nebula M2-48
Stellar ejecta and their interaction with the the interstellar medium (2006)
Stellar ejecta and their interaction with the the interstellar medium
Theory and observations of a jet in the Orionis region: HH 444 (2006)
J. Meaburn, A. C. Raga, J. A. López, L. López Martín
Theory and observations of a jet in the Orionis region: HH 444
Observations of jets in H II regions (hh 444) (2006)
J. Meaburn, A. C. Raga, J. A. López, L. López Martín
Observations of jets in H II regions (hh 444)
The theory of photoionized jets (2006)
J. Meaburn, A. C. Raga, J. A. López, L. López Martín
The theory of photoionized jets
Shock excitation of the knots of Hen 3-1475 (2006)
Riera, A., Binette, L., Raga, A. C.
We present new optical STIS HST spectroscopic observations of the jets of the proto-planetary nebula Hen 3-1475. The excitation conditions of the knots of Hen 3-1475 are derived from the observed...
A New, 3D Adaptive Grid Code for Astrophysical and Geophysical Gasdynamics (2006)
A. C. Raga, M. Villagrán Muniz, R. Navarro González
A New, 3D Adaptive Grid Code for Astrophysical and Geophysical Gasdynamics
Relation between Source and Temperature Fluctuations in Photoionized Nebulae (2006)
A. C. Raga, Wolfgang Steffen, Luc Binette, P. Ferruit
Relation between Source and Temperature Fluctuations in Photoionized Nebulae
Herbig-Haro Jets Emerging from a Neutral Cloud into a H II region (2006)
Herbig-Haro Jets Emerging from a Neutral Cloud into a H II region
Herbig-Haro Jets from Sources in Elliptical Orbits (2006)
Herbig-Haro Jets from Sources in Elliptical Orbits
3D Simulations of the Fragmentation of Photoevaporating Clumps Embedded in a Stellar Wind (2006)
A. C. Raga, R. F. González, Wolfgang Steffen
3D Simulations of the Fragmentation of Photoevaporating Clumps Embedded in a Stellar Wind
The Emission from Photoionized Stellar Wind Bow Shocks (2006)
A. C. Raga, J. Cantó, R. F. González
The Emission from Photoionized Stellar Wind Bow Shocks
The Formation of H2 in Variable Herbig-Haro Jets (2006)
A. C. Raga, A. J. Lim, D. A. Williams
The Formation of H2 in Variable Herbig-Haro Jets
The Interaction of a Jet-Like Pulse with a Wind from a Stellar Companion (2006)
A. Riera, A. C. Raga, J. Alcolea
The Interaction of a Jet-Like Pulse with a Wind from a Stellar Companion
The Transverse Velocity Structure of the HH 111 Jet (2006)
R. López, A. Riera, A. C. Raga, G. Anglada, R. Estalella
The Transverse Velocity Structure of the HH 111 Jet
Interpreting the proper motions of the HH 34S bowshock (2006)
E. Masciadri, A. C. Raga, J. Cantó, P. F. Velázquez
Interpreting the proper motions of the HH 34S bowshock
A Model for the Cross Section of a Turbulent, Radiative Jet or Wake (2006)
A. Riera, A. C. Raga, J. Cantó
A Model for the Cross Section of a Turbulent, Radiative Jet or Wake
An Analytic Model for the Motion of the Head of a Variable Jet (2006)
An Analytic Model for the Motion of the Head of a Variable Jet
Hydrodynamical Interaction between an Accretion Flow and a Stellar Wind (2006)
A. C. Raga, J. Cantó, S. Mendoza
Hydrodynamical Interaction between an Accretion Flow and a Stellar Wind
Fabry-Perot Observations of HH 1/2 (2006)
A. Riera, A. C. Raga, B. Reipurth, Ph. Amram, J. Boulesteix, O. Toledano
Fabry-Perot Observations of HH 1/2
Proper motions in cepheus A (2006)
A. C. Raga, Luis F. Rodríguez, J. M. Torrelles, J. Cantó, Salvador Curiel, G. Garay
Proper motions in cepheus A
Numerical simulations of the fragmentation of photoevaporating nonuniform clumps (2006)
A. C. Raga, R. F. González, Wolfgang Steffen
Numerical simulations of the fragmentation of photoevaporating nonuniform clumps
Shadows and photoevaporated flows from neutral clumps exposed to two ionizing sources (2006)
Cantó , J., Cerqueira , A. H., Raga , A. C., Vasconcelos , M. J.
Glóbulos neutros sumergidos en regiones H II se encuentran frecuentemente en regiones de formación estelar. En este trabajo investigamos la formación de regiones de sombra detrás de glóbulos...
Emission line ratios from variable velocity jet models (2006)
Kajdic , P., Raga , A. C., Velázquez , P. F.
En este artículo, presentamos una red de simulaciones numéricas axisimétricas de jets con velocidad de eyección variable. En estos modelos, suponemos que los jets son eyectados con una velocidad...
Cerqueira, A. H., Velazquez, P. F., Raga, A. C., Vasconcelos, M. J., De Colle, F.
Using the Yguazu-a three-dimensional hydrodynamic code, we have computed a set of numerical simulations of heavy, supersonic, radiatively cooling jets including variabilities in both the ejection...
GMOS-IFU Spectroscopy of 167-317 (LV2) Proplyd in Orion (2005)
Vasconcelos, M. J., Cerqueira, A. H., Plana, H., Raga, A. C., Morisset, C.
We present high spatial resolution spectroscopic observations of the proplyd 167-317 (LV2) near the Trapezium cluster in the Orion nebula, obtained during the System Verification run of the Gemini...
The interaction of a jet-like pulse with a wind from a stellar companion (2005)
Riera, A., Raga, A. C., Alcolea, J.
We present numerical simulations of the interaction between a collimated, bipolar ``pulse'' ejected from a star and a continuous wind ejected from a stellar companion. We explore the characteristics...
Fabry-Perot Observations of HH 1/2 (2005)
Riera, A., Raga, A. C., Reipurth, B., Amram, Ph., Boulesteix, J., Toledano, O.
3D Simulations of the Fragmentation of Photoevaporating Clumps Embedded in a Stellar Wind (2005)
González , R. F., Raga , A. C., Steffen , Wolfgang
We present 3D numerical simulations of the interaction of a dense, neutral clump with an impinging external wind+ionizing photon field. We find that models with very weak ionizing photon fields...
Fabry-Perot Observations of HH 1/2 (2005)
Amram , Ph., Boulesteix , J., Raga , A. C., Reipurth , B., Riera , A., Toledano , O.
We present new H Fabry-Perot observations of the HH 1/2 system. Line profiles, barycenter radial velocity maps and dispersion maps are derived from the channel maps of HH 1 and HH 2. The radial...
Proper motions in cepheus A (2005)
Cantó , J., Curiel , Salvador, Garay , G., Raga , A. C., Rodríguez , Luis F., Torrelles , J. M.
We present an analysis of radio continuum observations made with the Very Large Array toward the region of massive star formation Cepheus A. The main purpose of this analysis is to search and study...
Numerical simulations of the fragmentation of photoevaporating nonuniform clumps (2005)
González , R. F., Raga , A. C., Steffen , Wolfgang
In this paper, we present 3D gasdynamical simulations of the interaction of nonuniform clumps with an external (plane-parallel) ionizing photon ux. We show that, as a consequence of the initial...
The Emission from Photoionized Stellar Wind Bow Shocks (2005)
Cantó , J., González , R. F., Raga , A. C.
Photoionized stellar wind bow shocks are found in a number of different astrophysical objects : compact H II regions, H II regions around runaway O stars and bow shocks around young, low mass stars...
The Formation of H2 in Variable Herbig-Haro Jets (2005)
Lim , A. J., Raga , A. C., Williams , D. A.
The chains of aligned knots that define the beams of HH jets are sometimes observed both in atomic/ionic as well as in molecular (H2) emission lines. We model such objects as jets with an ejection...
The Interaction of a Jet-Like Pulse with a Wind from a Stellar Companion (2005)
Alcolea , J., Raga , A. C., Riera , A.
We present numerical simulations of the interaction between a collimated, bipolar ¿pulse" ejected from a star and a continuous wind ejected from a stellar companion. We explore the characteristics...
Looking for outflows from brown dwarfs (2004)
First evidences of IR excess and disk mass accretion (strong H$\alpha$ emission) around brown dwarfs seem to indicate the existence of circumstellar disks around these sub-stellar objects. Nothing is...
HH110 Jet Near Infrared Imaging. I. The Outflow Mixing Layer? (2004)
Noriega-Crespo, A., Garnavich, P.M., Raga, A.C., Canto, J.
Near infrared images are presented of the Herbig-Haro 110 jet centered at the molecular hydrogen lines. The ratio of these lines provides a preliminary diagnostic of molecular gas excitation, which...
A Highly Collimated Molecular Hydrogen Jet in IRAS 05487+0255: NIR Imaging and Spectroscopy (2004)
Noriega-Crespo, A., Garnavich, P. M., Raga, A. C., Bohm, K. H.
Numerical Modeling of Eta Carinae Bipolar Outflows (2004)
Gonzalez, R. F., Raga, A. C., Velazquez, P. F.
In this paper, we present two-dimensional gas dynamic simulations of the formation and evolution of the eta-Car bipolar outflows. Adopting the interacting nonspherical winds model, we have carried...
Time-dependent ejection velocity model for the outflow of Hen 3--1475 (2004)
Velazquez, P. F., Riera, A., Raga, A. C.
We present 2D axisymmetric and 3D numerical simulations of the proto-planetary nebula Hen 3-1475, which is characterized by a remarkably highly collimated optical jet, formed by a string of...
A variable-velocity, precessing jet model for HH 32 (2004)
Raga, A. C., Riera, A., Masciadri, E., Beck, T., Böhm, K. H., Binette, L.
HH 32 has a bright, strongly redshifted lobe with a system of scattered condensations. We propose that these condensations correspond to internal working surfaces in a variable ejection velocity,...
Looking for outflows from brown dwarfs (2004)
Initial evidence of IR excess and disk mass accretion (strong Halpha emission) around brown dwarfs (BDs) seems to indicate the existence of circumstellar disks around these substellar objects....
Hydrodynamical Interaction between an Accretion Flow and a Stellar Wind (2004)
Cantó , J., Mendoza , S., Raga , A. C.
Molecular clouds in the interstellar medium suffer gravitational instabilities that lead to the formation of one or multiple stars. A recently formed star inside a cold cloud communicates its...
Herbig-Haro Jets Emerging from a Neutral Cloud into a H II region (2004)
We present numerical simulations of a Herbig-Haro ow that bursts out of a dense cloud core into a surrounding HII region. Such blow-outs from cloud cores have recently been imaged in various...
Herbig-Haro Jets from Sources in Elliptical Orbits (2004)
González , R. F., Raga , A. C.
In this paper, we study the kinematical evolution of a HH (Herbig-Haro) jet produced in a binary stellar system in which the jet source is moving in an elliptical orbit around a stellar companion. An...
Gas Dynamical Simulations of the Large and Little Homunculus Nebulae of Eta Carinae (2003)
González, R. F., Raga, A. C., Velázquez, P. F.
We here present two-dimensional, time-dependent radiatively cooling hydrodynamical simulations of the large and little Homunculus nebulae around $\eta$ Carinae. We employ an alternative scenario to...
The 3-Dimensional Structure of HH 32 from GMOS IFU Spetroscopy (2003)
Beck, Tracy L., Riera, A., Raga, A. C., Aspin, C.
We present new high resolution spectroscopic observations of the Herbig-Haro object HH 32 from System Verification observations made with the GMOS IFU at Gemini North Observatory. The 3D spectral...
A model for the cross section of a turbulent, radiative jet or wake (2003)
Canto, J., Raga, A. C., Riera, A.
We present an analytical model for the cross section of a turbulent, radiative jet or wake. This model is appropriate for modeling HH jets, or "wakes" left behind by "astrophysical bullets". Even...
Fabry-Perot observations of the HH 110 jet (2003)
Riera, A., Raga, A. C., Reipurth, B., Amram, Ph., Boulesteix, J., Canto, J., ...
We have obtained a Halpha position-velocity cube from Fabry-Perot interferometric observations of the HH 110 flow. We analyze the results in terms of anisotropic wavelet transforms, from which we...
The transverse velocity and excitation structure of the HH 110 jet (2003)
Riera, A., Lopez, R., Raga, A. C., Estalella, R., Anglada, G.
We present long-slit spectroscopic observations of the HH 110 jet obtained with the 4.2~m William Herschel Telescope. We have obtained for the first time, spectra for slit positions along and across...
Herbig-Haro objects from orbiting sources (2003)
The wiggles detected in HH outflows can be related, in a few cases, to the orbital motion of a binary stellar system. For these outflows it is possible to calculate the mass of the jet source and the...
HH 111 STIS observations and their analysis using analytical and numerical models (2003)
Noriega-Crespo, A., Raga, A. C., Masciadri, E.
The internal structure of stellar jets arising from young stellar objects is characterized by a series of `knots' or condensations which have highly supersonic proper motions. These structures, we...
Entrainment in Herbig-Haro Objects (2003)
Mininni , P., Noriega Crespo, A., Raga , A. C., Velázquez , P. F.
The Transverse Velocity Structure of HH Jets (2003)
Anglada , G., Estalella , R., López , R., Raga , A. C., Riera , A.
A Model for the Cross Section of a Turbulent, Radiative Jet or Wake (2003)
Cantó , J., Raga , A. C., Riera , A.
We present an analytical model for the cross section of a turbulent, radiative jet or wake. This model is appropriate for modeling HH jets, or ¿wakes¿ left behind by ¿astrophysical bullets¿. Even...
An Analytic Model for the Motion of the Head of a Variable Jet (2003)
We present a model for the motion of the head of a variable jet which conserves both mass and momentum. Our model is in principle applicable for an ejection variability of arbitrary form. However, we...
Relation between Source and Temperature Fluctuations in Photoionized Nebulae (2003)
Binette , Luc, Ferruit , P., Raga , A. C., Steffen , Wolfgang
The magnitude of the temperature fluctuations (t2) required to explain the observed inconsistencies between metallicities inferred from recombination lines and from forbidden lines cannot be attained...
Relation Between Source And Temperature Fluctuations In Photoionized Nebulae (2003)
L. Binette, P. Ferruit, W. Steffen, A. C. Raga
The magnitude of the temperature uctuations (t ) required to explain the observed inconsistencies between metallicities inferred from recombination lines and from forbidden lines cannot be attained...
The precession of the giant HH34 outflow: a possible jet deceleration mechanism (2002)
Masciadri, E., Raga, A. C., Noriega-Crespo, A.
The giant jets represent a fundamental trace of the historical evolution of the outflow activity over timescales which are comparable to the accretion time of the outflow sources in their main...
The X-ray Luminosities of HH Objects (2002)
Raga, A. C., Noriega-Crespo, A., Velazquez, P. F.
The recent detection of X-ray emission from HH 2 and HH 154 with the Chandra and XMM-Newton satellites (respectively) have opened up an interesting, new observational possibility in the field of...
Jet/cloud collision, 3D gasdynamic simulations of HH 110 (2002)
Raga, A. C., Noriega-Crespo, A., Mininni, P. D., Velázquez, P. F.
We present 3D, gasdynamic simulations of jet/cloud collisions, with the purpose of modelling the HH 270/110 system. From the models, we obtain predictions of H$\alpha$ and H$_2$ 1-0 s(1) emission...
Unveiling the structure of the planetary nebula M2-48 (2002)
Esteban , C., López , J. A., López Martín, L., Meaburn , J., Miranda , L. F., Olguín , L., ...
Interpreting the proper motions of the HH 34S bowshock (2002)
Cantó , J., Masciadri , E., Raga , A. C., Velázquez , P. F.
Reipurth et al. (2002) have obtained very detailed proper motions of the HH 34S bowshock using Hubble Space Telescope (HST) images. We find that these proper motions can be used to reconstruct the...
Kinematics of the HH 111 jet from STIS spectra (2001)
Raga, A. C., Noriega-Crespo, A., Reipurth, B., Garnavich, P. M., Heathcote, S., Bohm, K. H., ...
We present a long-slit spectrum of the Herbig-Haro object HH 111, obtained with SITS on the Hubble Space Telescope. This spectrum has a spectral resolution of approx. 50 km/s, so it gives a good...
Theory and observations of a jet in the _ orionis region: HH 444 (2001)
López , J. A., López Martín, L., Meaburn , J., Raga , A. C.
The discovery of a system of Herbig{Haro objects ejected by young, low mass stars in the Orionis region (Reipurth et al. 1998) has given rise to models of the photoionization of a neutral jet by an...
Stellar ejecta and their interaction with the the interstellar medium (2001)
This paper reviews one special type of interaction between stellar ejecta and the surrounding medium: the interaction of a jet with the surrounding ISM. The cases of jets from young stars and jets...
The Transverse Velocity Structure of the HH 111 Jet (2001)
Anglada , G., Estalella , R., López , R., Raga , A. C., Riera , A.
We present long-slit spectroscopic observations of the HH 111 jet obtained with the 4.2 m William Herschel Telescope. We have obtained spectra for slit positions along and across the jet axis, in...
Revista Mexicana de Astronoma y Astrofsica, 37, 147-157 (2001) (2001)
The Transverse Velocity, A. Riera, A. C. Raga, R. Estalella
We present long-slit spectroscopic observations of the HH 111 jet obtained with the 4.2 m William Herschel Telescope. We have obtained spectra for slit positions along and across the jet axis, in...
Photoevaporating flows from the cometary knots in the Helix nebula (NGC 7293) (2000)
Lopez-Martin, L., Raga, A. C., Mellema, G., Henney, W., Canto, J.
We explain the Ha emission of the cometary knots in the Helix Nebula (NGC 7293) with an analytical model that describes the emission of the head of the globules as a photoevaporated flow produced by...
Optical and Near Infrared Study of the Cepheus E outflow, a very low excitation object (2000)
Ayala, S., Noriega-Crespo, A., Garnavich, P. M., Curiel, S., Raga, A. C., Bohm, K. H., ...
We present images and spectra of the Cepheus E (Cep E) region at both optical and infrared wavelengths. Only the brightest region of the southern lobe of the Cep E outflow reveals optical emission,...
The theory of photoionized jets (2000)
López , J. A., López Martín, L., Meaburn , J., Raga , A. C.
In a previous paper we have discussed the photoionization of the beam of a Herbig-Haro (HH) jet which is immersed in an H II region. Here, we present further calculations of a photoionized HH jet...
Observations of jets in H II regions (hh 444) (2000)
López , J. A., López Martín, L., Meaburn , J., Raga , A. C.
We present high resolution long-slit spectra of HH 444 and numerical simula- tions for this Herbig-Haro object. From the comparison between observations and simulations we are able to study the...
Jet-cloud interations and the brightening of the narrow line region in Seyfert galaxies (1997)
Steffen, W., Gomez, J. L., Raga, A. C., Williams, R. J. R.
We study the kinematical and brightness evolution of emission line clouds in the narrow line region (NLR) of Seyfert galaxies during the passage of a jet. We derive a critical density above which a...
Jet cocoons and the formation of Narrow Line Clouds in Seyfert galaxies (1996)
Steffen, W., Gomez, J. L., Williams, R. J. R., Raga, A. C., Pedlar, A.
We present non-adiabatic hydrodynamic simulations of a supersonic light jet propagating into a fully ionized medium of uniform density on a scale representative of the narrow line region (NLR) in...
Henney, W. J., Raga, A. C., Axon, D. J.
Detailed comparisons are made between observations of scattered light upstream of the head of the HH~1 jet and predictions of simple scattering models. It is shown that, in order to unambiguously...