A5010482451- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- Molecular Spectroscopy and Structure
- Atmospheric Ozone and Climate
- Astrophysics and Cosmic Phenomena
- Diamond and Carbon-based Materials Research
- Astronomical Observations and Instrumentation
- Historical Studies on Spain
- High-pressure geophysics and materials
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Gamma-ray bursts and supernovae
- Historical Art and Architecture Studies
- Satellite Communication Systems
- Astronomy and Astrophysical Research
- Calibration and Measurement Techniques
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Spectroscopy and Laser Applications
- Atomic and Molecular Physics
- Bee Products Chemical Analysis
- Dust and Plasma Wave Phenomena
- Advanced Chemical Physics Studies
Cardiff University
2023
National Polytechnic School
2015-2023
Centro de Astrobiología
2015-2019
Consejo Superior de Investigaciones Científicas
2014
We used the IRAM 30m telescope to observe frequency range [86-116]GHz towards central regions of starburst galaxies M83, M82, and NGC253, AGNs M51, NGC1068, NGC7469, ULIRGs Arp220 Mrk231. Assuming LTE conditions, we calculated column densities 27 molecules 10 isotopologues. Among others, report first tentative detections CH3CHO, HNCO, NS in M82 and, for time extragalactic medium, HC5N NGC253. Halpha recombination lines were only found Vibrationally excited HC3N detected Arp220. CH3CCH...
We present an unbiased spectral line survey toward the Galactic Centre (GC) quiescent giant molecular cloud (QGMC), G+0.693 using GBT and IRAM 30$\,$ telescopes. Our study highlights extremely rich organic inventory of abundant amounts nitrogen (N)-bearing species in a source without signatures star formation. report detection 17 N-bearing this source, which 8 are complex molecules (COMs). A comparison derived abundances relative to H$_2$ is made across various galactic extragalactic...
We report the first detection in interstellar medium of Z-isomer cyanomethanimine (HNCHCN), an HCN dimer proposed as precursor adenine. identified six transitions Z-cyanomethanimine, along with five E-cyanomethanimine, using IRAM 30m observations towards Galactic Center quiescent molecular cloud G+0.693. The has a column density (2.0$\pm$0.6)$\times$10$^{14}$ cm$^{-2}$ and abundance 1.5$\times$10$^{-9}$. relative ratio between isomers is [Z/E]$\sim$6. This value cannot be explained by two...
Abstract Phosphorus (P) is one of the essential elements for life due to its central role in biochemical processes. Recent searches have shown that P-bearing molecules (in particular PN and PO) are present star-forming regions, although their formation routes remain poorly understood. In this letter, we report observations PO towards seven molecular clouds located Galactic Center, which characterized by different types chemistry. detected five out sources, whose chemistry thought be...
The Milky Way’s Central Molecular Zone (CMZ) differs dramatically from our local solar neighbourhood, both in the extreme interstellar medium conditions it exhibits (e.g. high gas, stellar, and feedback density) strong dynamics at play due to shear gas influx along bar). Consequently, is likely that there are large-scale physical structures within CMZ cannot form elsewhere Way. In this paper, we present new results Atacama Large Millimeter/submillimeter Array (ALMA) large programme ACES...
We present the results of two Mopra 3-mm spectral line surveys lines sight (LOS) towards Galactic Centre (GC) molecular complexes Sgr B2 (LOS+0.693) and A (LOS−0.11). The spectra covered frequency ranges ∼77–93 GHz ∼105–113 GHz. have detected 38 species 25 isotopologues. isotopic ratios derived from column density are consistent with canonical values, indicating that chemical fractionation and/or selective photodissociation can be considered negligible (<10 per cent) for GC physical...
ABSTRACT We present SiO J = 2–1 maps of the Sgr B2 molecular cloud, which show shocked gas with a turbulent substructure comprising at least three cavities velocities $[10,40]\, \rm km\, s^{-1}$ and an arc $[-20,10]\, s^{-1}$. The spatial anticorrelation low high velocities, presence bridging features in position-velocity diagrams suggest that these structures formed cloud–cloud collision. Some known compact H ii regions spatially overlap sites strong emission $[40,85]\, s^{-1}$, are between...
We present a spectral and temporal analysis of XMM-Newton data from sample six galaxies (NGC 3783, Mrk 279, 766, NGC 3227, 7314, 3516). Using the hardness-ratio curves, we identify time-intervals in which clouds are eclipsing central X-ray source five sources. detect three occultations 3227 one occultation 3516, together with well-known 766. estimate physical properties clouds. The derived size sources ($\sim$(3-28)$\times$10$^{13}$ cm) is less than that column densities...
ABSTRACT The Central Molecular Zone (CMZ; the central ∼500 pc of Galaxy) is a kinematically unusual environment relative to Galactic disc, with high-velocity dispersions and steep size–linewidth relation molecular clouds. In addition, CMZ region has significantly lower star formation rate (SFR) than expected by its large amount dense gas. An important factor in explaining low SFR turbulent state star-forming gas, which seems be dominated rotational modes. However, turbulence driving...
The lines of HOC$^+$, HCO and CO$^+$ are considered good tracers photon-dominated regions (PDRs) X-ray dominated regions. We study these towards the Sgr B2 cloud selected to be affected by different heating mechanisms. find lowest values column density ratios HCO$^+$ versus in dense HII gas, where UV photons dominate chemistry gas. abundances above compared with those chemical modeling, finding that high temperature chemistry, a cosmic-ray ionization rate 10$^{-16}$ s$^{-1}$ timescales...
The Milky Way's Central Molecular Zone (CMZ) differs dramatically from our local solar neighbourhood, both in the extreme interstellar medium conditions it exhibits (e.g. high gas, stellar, and feedback density) strong dynamics at play due to shear gas influx along bar). Consequently, is likely that there are large-scale physical structures within CMZ cannot form elsewhere Way. In this paper, we present new results Atacama Large Millimeter/submillimeter Array (ALMA) large programme ACES...
Aims: We study the spatial distribution and kinematics of water emission in a ~64 pc$^2$ region Galactic Center (GC) around Sgr A*. also analyze excitation to derive physical conditions abundances CND `quiescent clouds'. Methods: presented integrated intensity maps ortho 1$_{10}-1_{01}$, para 2$_{02}-1_{11}$ 1$_{11}-0_{00}$ transitions observed with HIFI instrument on board Herschel. To we used ground state H$_2^{18}$O transitions. In our study, SPIRE continuum measurements CND. Using...
Based on CO(2-1) public data, we study the monoxide oxygen gas excitation conditions and magnetic field strength of four spiral galaxies. For galaxy outskirts, found kinetic temperatures in range $\lesssim$35--38 K, CO column densities $\lesssim 10^{15}$--$10^{16}$ cm$^{-2}$, H$_2$ masses 4\times 10^6$--$6\times10^8$ M$_\odot$. An density 10^3$ cm$^{-3}$ is suitable to explain 2$\sigma$ upper limits line intensity. We constrain for our sample galaxies their outskirts by using evaluate a...
We present a study of diffuse extended ionised gas toward three clouds located in the Galactic Centre (GC). One line sight (LOS) is 20 km s$^{-1}$ cloud (LOS$-$0.11) Sgr A region, another LOS 50 (LOS$-$0.02), also A, while third B2 (LOS+0.693). The emission from detected H$n\alpha$ and H$m\beta$ radio recombination lines (RRLs). He$n\alpha$ He$m\beta$ RRL with same $n$ $m$ as those hydrogen RRLs only LOS+0.693. probe positive negative velocities two sources. to ratios reveal that emitted...
Abstract We compare the properties of shocked gas in Sgr B2 with maps obtained from 3D simulations a collision between two fractal clouds. In agreement 13 CO(1-0) observations, our show that cloud-cloud produces region highly turbulent density substructure an average . Similarly, numerical multi-channel shock study shows colliding clouds are efficient at producing internal shocks velocities 5 − 50 km s −1 and Mach numbers ∼ 4 40, which needed to explain 10 −9 SiO abundances inferred SiO(2-1)...
Abstract We present the first submillimetric line survey of extragalactic sources carried out by APEX. The surveys cover 0.8 mm atmospheric window from 270 to 370GHz toward NGC253, NGC4945 and Arp220. found in NGC 253, 150 transitions 26 molecules. For 4945, 136 24 molecules, 64 17 molecules for Arp 220. Column densities rotation temperatures have been determinate using Local Thermodinamical Equilibrium(LTE) profile simulation fitting MADCUBA IJ software. differences ratios between Galactic...
The Central Molecular Zone (CMZ; the central ~ 500 pc of Galaxy) is a kinematically unusual environment relative to Galactic disc, with high velocity dispersions and steep size-linewidth relation molecular clouds. In addition, CMZ region has significantly lower star formation rate (SFR) than expected by its large amount dense gas. An important factor in explaining low SFR turbulent state star-forming gas, which seems be dominated rotational modes. However, turbulence driving mechanism...
We use observations of the neutral atomic hydrogen (HI) 21-cm emission line to study spatial distribution HI gas in a 80$\degree\times~$90$\degree$ region Galaxy halo. The column densities range \mbox{3--11$\times$10$^{20}$ cm$^{-2}$} have been estimated for some studied regions. In our map---obtained with spectral sensitivity $\sim$2 K---we do not detect any {above 2$\sigma$} at Galactic latitudes higher than $\sim${46}$\degree$. {This report summarizes contribution presented conference on...
Using 70 $\mu$ m observations taken with the PACS instrument of Herschel space telescope, dust content nearby and interacting spiral galaxy NGC 3077 has been compared isolated galaxies such as 2841, 3184 3351. The allowed us to derive dust-to-gas ratios for four our sample. We find that 3351 have masses 6.5-9.1 $\times$ 10$^7$ M$\odot$, which are a factor $\sim$10 higher than value found 3077. This result shows is deficient galaxy, was expected, because this affected by tidal interactions...
In the infrared part of electromagnetic spectrum, relativistic dispersion theory is applied to SS433 jets, describe its properties. particular, we here investigate Doppler effect radiation in cold plasma approximation for this micro-quasar.
Se llevo a cabo un estudio de la curva rotacion galaxia NGC 7331 situada 14,7 Mpc Tierra.La se derivo usando observaciones radioastronomicas del monoxido carbono (CO). La forma dela y las velocidades son muy similares aquellas derivadas previamente, empleando datos dehidrogeno atomico, lo que sugiere coexistencia ambos elementos en regiones estudiadas 7331. Sedescubrio el ensanchamiento linea CO, transicion 2-1, esta dominado por efectos turbulentos gas deCO antes termicos. Asimismo, campo...