Interstellar Archives

Anomalous ∆t ∆f pulse pair counts are observed in the FWHM of the interferometer instrument, at higher levels of Cohen’s d in the current work, than observed in [2] Fig. 2. Binomial cumulative probability: e.g. (328 trials, 8.2 mean, count > mean, at 3.8 s.d.) = 0.0003. -- eess.SP

Intelligence & Language, Interstellar, SETI & Technosignatures, Status Report

Replication of Filtered Interferometer Measurements In Interstellar Communications

by Keith CowingJuly 15, 2024July 7, 2024

Interstellar communication signals have been conjectured to be present, albeit difficult to identify. Experiments conducted since 2018 indicate an anomalous presence of a type of speculated interstellar signal, delta-t delta-f […]

Astrochemistry, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Imaging & Spectroscopy, Status Report

Rotational Spectroscopy of CH3OD with a Reanalysis of CH3OD Toward IRAS 16293−2422

by Keith CowingJuly 13, 2024July 7, 2024

We have started a measurement campaign of numerous methanol isotopologs in low-lying torsional states in order to provide extensive line lists for radio astronomical observations from an adequate spectroscopic model […]

Selection of rotational transitions of CH317OH covered by the ReMoCA survey. The LTE synthetic spectrum of CH317OH used to derive its column density toward Sgr B2(N2b) is displayed in red and overlaid on the observed spectrum shown in black. The blue synthetic spectrum contains the contributions of all molecules identified in our survey so far, including CH317OH . The values written below each panel correspond from left to right to the half-power beam width, the central frequency in MHz, the width in MHz of each panel in parentheses, and the continuum level in K of the baseline-subtracted spectra in brackets. The y-axis is labeled in brightness temperature units (K). The dotted line indicates the 3σ noise level. -- astro-ph.GA

Astrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Imaging & Spectroscopy, Interstellar, Status Report

Investigation of the Rotational Spectrum of CH317OH and its Tentative Detection Toward Sagittarius B2(N)

by Keith CowingJuly 13, 2024July 7, 2024

Methanol is an abundant molecule in space. The column density of CH138OH is in some star-forming regions so high that the search for CH317OH is promising. But only very few […]

Four configurations of the distribution of spaxels with spectra of different BPT types in the circumnuclear regions of cSB galaxies. The BPT radiation types for individual spaxels are colour-coded. The yellow circle shows the kinematic centre of the galaxy, the line indicates a position of the major kinematic axis of the galaxy, and the ellipse is the optical radius. -- astro-ph.GA

Astrochemistry, Astronomy & Telescopes, Imaging & Spectroscopy, Interstellar, Status Report

Central Oxygen Abundances In The Spiral Galaxies Of The MaNGA Survey: Galaxies With Central Starbursts

by Keith CowingJuly 12, 2024July 7, 2024

We examine whether there are deviations of the local central oxygen abundances in spiral galaxies from the general metallicity gradients.

Astrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Imaging & Spectroscopy, Interstellar, Status Report

Discovery Of The Interstellar Cyanoacetylene Radical Cation HC3N+

by Keith CowingJuly 11, 2024July 7, 2024

We report the first identification in space of HC3N+, the simplest member of the family of cyanopolyyne cations. Three rotational transitions with half-integer quantum numbers from J=7/2 to 11/2 have […]

This image by NASA’s James Webb Space Telescope’s Near-Infrared Camera (NIRCam) features the central region of the Chamaeleon I dark molecular cloud, which resides 630 light years away. The cold, wispy cloud material (blue, center) is illuminated in the infrared by the glow of the young, outflowing protostar Ced 110 IRS 4 (orange, upper left). The light from numerous background stars, seen as orange dots behind the cloud, can be used to detect ices in the cloud, which absorb the starlight passing through them. Larger image

Astrochemistry, Astrogeology, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Cryobiology, Habitable Zones, Icy Worlds, Interstellar, Press Release, Water/Hycean Worlds & Oceanography

JWST Sheds Light On The Structure Of Interstellar Water Ice

by Keith CowingJuly 5, 2024July 5, 2024

Using the JWST, a team of researchers including Paola Caselli, Barbara Michela Giuliano and Basile Husquinet from MPE, have probed deep into dense cloud cores, revealing details of interstellar ice […]

The velocity integrated maps and spatial averaged spectra of C4H 9–8, c-C3H2 2–1 and H13CO+ 1–0. The source names are presented in the maps and spectra. The gray scale color at the right is in units of K km s−1 . (a): The velocity integrated intensity maps for C4H 9–8 (magenta contours), c-C3H2 2–1 (blue contours) and H13CO+ 1–0 (green contours) of G001.38+20. (b): The same as Figure 1(a) but for G001.84+16. (c): Spectra of C4H at 85672.5793 MHz, c-C3H2 at 85338.8940 MHz and H13CO+ at 86754.2884 MHz in the yellow box of G001.38+20. (d): The same as Figure 1(c) but for G001.84+16. The detailed mapping information of all sources for C4H 9–8, c-C3H2 2–1 and H13CO+ 1–0 are listed in Table 4. -- astro-ph.GA

Astrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Imaging & Spectroscopy, Status Report

Spatial Distribution of C4H and c-C3H2 in Cold Molecular Cores

by Keith CowingJuly 3, 2024July 1, 2024

C4H and c-C3H2, as unsaturated hydrocarbon molecules, are important for forming large organic molecules in the interstellar medium. We present mapping observations of C4H (N=9−8) lines, c-c-C3H2 (JKa,Kb=21,2-10,1) %at 85338.894 […]

Representation of ONIOM approach used to compute the adsorption energy of benzene on an ice surface model. Each component of the energy expression at the top is decomposed into up to three calculations: two periodic DFT calculations (full system and model) and one DLPNO-CCSD(T) calculation (model). The full system optimised at the PBE-D3/MOLOPT-TZV2P is shown at the top of each panel. Note that the benzene component is simply computed directly at the DLPNO-CCSD(T)/CBS level using an optimised PBE-D3/MOLOPT-TZV2P geometry. PBE-D3 calculations are indicated using a green colour and the DLPNO-CCSD(T) calculations using a purple colour. -- astro-ph.EP

Astrochemistry, Biochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Status Report

Hybrid Approach Predicts A Lower Binding Energy For Benzene On Water Ice

by Keith CowingJune 28, 2024June 28, 2024

In this paper we provide a highly accurate value for the binding energy of benzene to proton-ordered crystalline water ice (XIh), as a model for interstellar ices.

The Webb version of the Pillars of Creation image showcases orange and orange-brown dust that is semi-transparent, with light blue ionized gas against a dark blue background. larger image

Astrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Imaging & Spectroscopy, Interstellar, Press Release

Astrochemistry and Astrophysics Interplay: The Pillars of Creation – Where Embryonic Stars Form

by Keith CowingJune 27, 2024June 27, 2024

Made famous in 1995 by NASA’s Hubble Space Telescope, the Pillars of Creation in the heart of the Eagle Nebula have captured imaginations worldwide with their arresting, ethereal beauty.

Optimized geometries of the adsorption complexes of ethylamine (top) and ethanol (bottom) on the crystalline water ice surface model. The corresponding computed BE(0)s are also given. -- astro-ph.GA

Astrochemistry, Biochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Imaging & Spectroscopy, Interstellar, Status Report

Binding Energies of Ethanol and Ethylamine on Interstellar Water Ices: Synergy Between Theory and Experiments

by Keith CowingJune 26, 2024June 26, 2024

Experimental and computational chemistry are two disciplines to conduct research in Astrochemistry, providing essential reference data for both astronomical observations and modeling. These approaches not only mutually support each other, […]

Interstellar

Replication of Filtered Interferometer Measurements In Interstellar Communications

Rotational Spectroscopy of CH3OD with a Reanalysis of CH3OD Toward IRAS 16293−2422

Investigation of the Rotational Spectrum of CH317OH and its Tentative Detection Toward Sagittarius B2(N)

Central Oxygen Abundances In The Spiral Galaxies Of The MaNGA Survey: Galaxies With Central Starbursts

Discovery Of The Interstellar Cyanoacetylene Radical Cation HC3N+

JWST Sheds Light On The Structure Of Interstellar Water Ice

Spatial Distribution of C4H and c-C3H2 in Cold Molecular Cores

Hybrid Approach Predicts A Lower Binding Energy For Benzene On Water Ice

Astrochemistry and Astrophysics Interplay: The Pillars of Creation – Where Embryonic Stars Form

Binding Energies of Ethanol and Ethylamine on Interstellar Water Ices: Synergy Between Theory and Experiments

Relevance of the Avalon Assemblage as an Astrobiological Analog for Icy Ocean Worlds

The Climate and Potential Habitability of a Warm and Oxygenated Mars

Variable X-ray flux May Explain Variable Helium Escape From The Habitable-zone Exoplanet LHS 1140b

Spacetime Contactability in Galactic Civilization Networks: Contact Counts and Percolation

Surprisingly Enriched CO and CH4 in Halley-type Comet 13P/Olbers: Clues to Its Interstellar Heritage