A5027271398- Astrophysics and Star Formation Studies
- Molecular Spectroscopy and Structure
- Stellar, planetary, and galactic studies
- Atmospheric Ozone and Climate
- Advanced Chemical Physics Studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Spectroscopy and Laser Applications
- Astronomical Observations and Instrumentation
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Origins and Evolution of Life
- Atomic and Molecular Physics
- High-pressure geophysics and materials
- Calibration and Measurement Techniques
- Atomic and Subatomic Physics Research
- Phase Equilibria and Thermodynamics
- Pharmacological Effects and Assays
- Adaptive optics and wavefront sensing
- Chemical Reaction Mechanisms
- Thermodynamic properties of mixtures
- Photosynthetic Processes and Mechanisms
- Laser Design and Applications
- Synthesis and Properties of Aromatic Compounds
Arcetri Astrophysical Observatory
2015-2024
Centro de Astrobiología
2013-2024
Consejo Superior de Investigaciones Científicas
2013-2024
Instituto Nacional de Técnica Aeroespacial
2021-2022
Victor (Japan)
2022
National Institute for Astrophysics
2020
San Francisco State University
2010
Abstract We present the first detection of ( Z )-1,2-ethenediol, (CHOH) 2 , enol form glycolaldehyde, in interstellar medium toward G+0.693−0.027 molecular cloud located Galactic Center. have derived a column density (1.8 ± 0.1) × 10 13 cm −2 which translates into abundance with respect to hydrogen 1.3 −10 . The ratio between glycolaldehyde and )-1,2-ethenediol is ∼5.2. discuss several viable formation routes through chemical reactions from precursors such as HCO, H CO, CHOH, or CH CHOH....
Abstract Following the discovery of dimethyl sulfide (DMS; CH 3 SCH ) signatures in comet 67P/Churyumov–Gerasimenko, we report first detection this organosulfur species interstellar medium during exploration an ultradeep molecular line survey performed toward Galactic center cloud G+0.693-0.027 with Yebes 40 m and IRAM 30 telescopes. We derive a column density N = (2.6 ± 0.3) × 10 13 cm −2 , yielding fractional abundance relative to H 2 ∼1.9 −10 . This implies that DMS is factor ∼1.6 times...
Formation of stars is now believed to be tightly linked the dynamical evolution interstellar filaments in which they form. In this paper we analyze density structure and kinematics a small network infrared dark filaments, SDC13, observed both dust continuum molecular line emission with IRAM 30m telescope. These observations reveal presence 18 compact sources amongst two most massive, MM1 MM2, are located at intersection point parsec-long filaments. The dense gas velocity dispersion along...
We study the molecular abundance and spatial distribution of simplest sugar alcohol, ethylene glycol (EG), glycoladehyde (GA), other chemically related complex organic species towards massive star-forming region G31.41+0.31. have analyzed multiple single dish interferometric data, obtained excitation temperatures column densities using an LTE analysis. reported for first time presence EG G31.41+0.31, we also detected transitions molecules such as GA, methyl formate (MF), dimethyl ether (DME)...
Context. Circumstellar discs around massive stars could mediate the accretion onto star from infalling envelope, and minimize effects of radiation pressure. Despite such a crucial role, only few convincing candidates have been provided for deeply embedded O-type (proto)stars.
Phosphorus is a crucial element in biochemistry, especially the P-O bond, which key for formation of backbone deoxyribonucleic acid. So far, PO has only been detected towards envelope evolved stars, and never star-forming regions. We report first detections two massive regions, W51 e1/e2 W3(OH), using data from IRAM 30m telescope. PN also The abundance ratio PO/PN 1.8 3 respectively. Our chemical model indicates that molecules are chemically related formed via gas-phase ion-molecule...
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...
Cell membranes are a key element of life because they keep the genetic material and metabolic machinery together. All present cell made phospholipids, yet nature first origin phospholipids still under debate. We report here detection in space ethanolamine, NH$_2$CH$_2$CH$_2$OH, which forms hydrophilic head simplest second most abundant phospholipid membranes. The molecular column density ethanolamine interstellar is $N$=(1.51$\pm$0.07)$\times$10$^{13}$ cm$^{-2}$, implying abundance with...
To understand how Phosphorus-bearing molecules are formed in star-forming regions, we have analysed ALMA observations of PN and PO towards the massive region AFGL 5142, combined with a new analysis data comet 67P/Churyumov-Gerasimenko taken ROSINA instrument onboard Rosetta. The maps show that emission arises from several spots associated low-velocity gas narrow linewidths cavity walls bipolar outflow. is more abundant than most spots, PO/PN ratio increasing as function distance to...
One of the proposed scenarios for origin life is primordial RNA world, which considers that molecules were likely responsible storage genetic information and catalysis biochemical reactions in primitive cells, before advent proteins DNA. In last decade, experiments field prebiotic chemistry have shown nucleotides can be synthesized from relatively simple molecular precursors, most been found space. An important exception hydroxylamine, NH$_2$OH, which, despite several observational attempts,...
Abstract The chemical compounds carrying the thiol group (-SH) have been considered essential in recent prebiotic studies regarding polymerization of amino acids. We searched for this kind compound toward Galactic Center quiescent cloud G+0.693–0.027. report first detection interstellar space trans-isomer monothioformic acid (t-HC(O)SH) with an abundance ∼1 × 10 −10 . Additionally, we provide a solid confirmation gauche isomer ethyl mercaptan (g-C 2 H 5 SH) ∼3 , and also detect methyl (CH 3...
In the past decade, astrochemistry has witnessed an impressive increase in number of detections complex organic molecules. Some these species are prebiotic interest such as glycolaldehyde, simplest sugar, or aminoacetonitrile, a possible precursor glycine. Recently, we have reported detection two new nitrogen-bearing organics, glycolonitrile and Z-cyanomethanimine, known to be intermediate formation process ribonucleotides within theories primordial RNA-world for origin life. this study,...
We used the Atacama Large Millimeter/submillimeter Array (ALMA), covering a nearly contiguous 289 GHz frequency range between 84.2 and 373.2 GHz, to image continuum spectral line emission at 1.6\arcsec ($\sim 28$ pc) resolution down sensitivity of $30-50$ mK. This article describes ALMA Comprehensive High-resolution Extragalactic Molecular Inventory (ALCHEMI) Program. focus on analysis spectra extracted from $15''$ ($\sim255$ Compact data. model molecular assuming local thermodynamic...
Theories on the origins of life propose that early cell membranes were synthesized from amphiphilic molecules simpler than phospholipids such as fatty alcohols. The discovery in interstellar medium (ISM) ethanolamine, simplest phospholipid head group, raises question whether simple are also space. We investigate precursors alcohols present ISM. For this, we have carried out a spectral survey at 7, 3, 2 and 1 mm toward Giant Molecular Cloud G+0.693-0.027 located Galactic Center using IRAM 30m...
We report the first detection of phosphorus monoxide ion (PO + ) in interstellar medium. Our unbiased and very sensitive spectral survey toward G+0.693–0.027 molecular cloud covers four different rotational transitions this molecule, two which ( J = 1–0 2–1) appear free contamination from other species. The fit performed, assuming local thermodynamic equilibrium conditions, yields a column density N =(6.0 ± 0.7) × 10 11 cm −2 . resulting abundance with respect to hydrogen is 4.5 –12 PO...
Abstract We report the first detection in interstellar medium (ISM) of a C 2 H 5 O N isomer: syn -glycolamide (NH C(O)CH OH). The exquisite sensitivity at sub-mK levels an ultradeep spectral survey carried out with Yebes 40 m and IRAM 30 telescopes toward G+0.693–0.027 molecular cloud has allowed us to unambiguously identify multiple transitions this species. derived column density (7.4 ± 0.7) × 10 12 cm −2 , which implies abundance respect 5.5 −11 . other isomers, including higher-energy...
Abstract We report the first detection in interstellar medium of N -cyanomethanimine (H 2 CNCN), stable dimer HCN highest energy and most complex organic molecule identified space containing prebiotically relevant NCN backbone. have a plethora -type rotational transitions with 3 ≤ J up 11 K that belong to this species toward Galactic center G+0.693-0.027 molecular cloud, only source showing three cyanomethanimine isomers (including Z - E -isomers C -cyanomethanimine, HNCHCN). derived total...
Abstract We present the first detection in space of O-protonated carbonyl sulfide (HOCS + ), midst an ultradeep molecular line survey toward G+0.693-0.027 cloud. From observation all K a = 0 transitions ranging from J lo 2 to 13 HOCS covered by our survey, we derive column density N (9 ± 2) × 10 12 cm −2 , translating into fractional abundance relative H ∼7 −11 . Conversely, S-protonated HSCO isomer remains undetected, and upper limit its with respect ≤3 factor ≥2.3 less abundant than obtain...
We present the first detection in space of thionylimide (HNSO) toward Galactic Center molecular cloud G+0.693-0.027, thanks to superb sensitivity an ultradeep line survey carried out with Yebes 40$\,$m and IRAM 30$\,$m telescopes. This molecule is species detected interstellar medium containing, simultaneously, N, S O. have identified numerous $K$$_a$ = 0, 1 2 transitions belonging HNSO covering from $J$$_{\rm up}$ 10, including several completely unblended features. derive a column density...
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$6. This value cannot be explained by two...
Abstract Phosphorus (P) is one of the essential elements for life due to its central role in biochemical processes. Recent searches have shown that P-bearing molecules (in particular PN and PO) are present star-forming regions, although their formation routes remain poorly understood. In this letter, we report observations PO towards seven molecular clouds located Galactic Center, which characterized by different types chemistry. detected five out sources, whose chemistry thought be...
Theories of a pre-RNA world suggest that glycolonitrile (HOCH$_2$CN) is key species in the process ribonucleotide assembly, which considered as molecular precursor nucleic acids. In this Letter, we report first detection pre-biotic molecule interstellar medium (ISM) by using ALMA data obtained at frequencies between 86.5$\,$GHz and 266.5$\,$GHz toward Solar-type protostar IRAS16293-2422 B. A total 15 unblended transitions HOCH$_2$CN were identified. Our analysis indicates presence cold...
Small imines containing up to three carbon atoms are present in the interstellar medium. As alkynyl compounds abundant this medium, propargylimine thus represents a promising candidate for new detection. The goal of work is perform comprehensive laboratory investigation rotational spectrum its ground vibrational state order obtain highly precise set rest-frequencies and search it space. spectra $E$ $Z$ geometrical isomers have been recorded 83-500 GHz frequency interval. measurements...
G+0.693-0.03 is a quiescent molecular cloud located within the Sagittarius B2 (Sgr B2) star-forming complex. Recent spectral surveys have shown that it represents one of most prolific repositories complex organic species in Galaxy. The origin such chemical complexity, along with small-scale physical structure and properties G+0.693-0.03, remains mystery. In this paper, we report study multiple molecules interferometric observations combination single-dish data G+0.693-0.03. Despite lack...
Abstract Amines, particularly primary amines (R-NH 2 ), are closely related to the primordial synthesis of amino acids since they share same structural backbone. However, only a limited number has been identified in interstellar medium, which prevents us from studying their chemistry as well relation prebiotic species that could lead emergence life. In this Letter, we report first detection vinylamine (C H 3 NH ) and tentative ethylamine 5 toward Galactic center cloud G+0.693-0.027. The...