ALMA Archives

Emission of SO, SiS, and SO2 integrated in velocity. Upper panels: velocity-integrated emission of, from left to right, SO N = 3 − 2, N = 2 − 1(2), N = 2 − 1(3), and N = 4 − 4 (see Table 1 for the spectral parameters). The integration velocity range is 85.7–105.8 km s−1 in all images to match the velocity interval where the PN emission is detected. The black contours start from the 3σ rms level of the integrated maps, which is, from left to right: 4.8 × 10−2 Jy beam−1 km s−1 ; 2.5 × 10−2 Jy beam−1 km s−1 ; 3.6 × 10−2 Jy beam−1 km s−1 ; 2.7 × 10−2 Jy beam−1 km s−1 , and the step is of 10σ rms. The white contour corresponds to the PN integrated emission, and the numbered regions "1" and "2" are those defined in Fig. 1. The synthesised beam is illustrated in the lower-left corner. To the right of the quantum numbers, we indicate the Eup of the transition. Lower panels: same as the upper panels for the SiS J = 5 − 4 and J = 6 − 5 lines, and the SO2 JKa,Kb = 31,3 − 20,2 and JKa,Kb = 101,9 − 100,10 lines. The 3σ rms level is: 2.9 × 10−2 Jy beam−1 km s−1 for SiS J = 5 − 4; 2.3 × 10−2 Jy beam−1 km s−1 for SiS J = 6 − 5; 2.95 × 10−3 Jy beam−1 km s−1 for SO2 JKa,Kb = 31,3 − 30,2; 1 × 10−2 Jy beam−1 km s−1 for SO2 JKa,Kb = 101,9 − 100,10. -- astro-ph.GA

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

The GUAPOS Project: G31.41+0.31 Unbiased ALMA Spectral Observational Survey. IV. Phosphorus-bearing Molecules And Their Relation With Shock Tracers

by Keith CowingNovember 24, 2023November 24, 2023

The astrochemistry of the important biogenic element phosphorus (P) is still poorly understood, but observational evidence indicates that P-bearing molecules are likely associated with shocks.

Integrated intensity map of NH2CHO and CH13 3 CN in Sgr B2(N1). The integrated intensity map of NH2CHO at 103.525 GHz are shown in color scale. The integrated intensity map of CH13 3 CN at 91.94 GHz is shown in contours, which represent 30% to 90% percent of peak integrated intensity. The white crosses indicate the position of Sgr B2(N1E), Sgr B2(N1S), and the center of Sgr B2(N1). The white ellipse shows the size of the respective synthetic beam. -- astro-ph.GA

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

Tentative Detection Of Cyanoformamide NCCONH2 In Space

by Keith CowingNovember 7, 2023November 7, 2023

The peptide-like molecules, cyanoformamide (NCCONH2), is the cyano (CN) derivative of formamide (NH2CHO). It is known to play a role in the synthesis of nucleic acid precursors under prebiotic conditions.

Continuum emission at 99 GHz in grey scale overlaid by contours of SO J = 23 − 12 at 99.3 GHz (top) and SiO J = 2 − 1 at 86.85 GHz (bottom) integrated intensities. The inner integration limits vary such that channels that contain deep absorption are excluded. The outer integration limits are fixed at 15 and 115 km s−1 for blue- and red-shifted SO emission, respectively, and 5 and 130 km s−1 for blue- and red-shifted SiO emission, respectively (see also Fig. 3). The blue and red contours start at 5σ and then increase by a factor of 2, where σ = 10.5 (SO, blue), 10.8 (SO, red), 4.5 (SiO, blue), and 5.8 K km s−1 (SiO, red) and corresponds to an average noise level that was measured in the respective map. The black contour indicates the 3σ level of the continuum emission (see Fig. 1). Based on the SO maps, we identify collimated features possibly tracing outflow axes that are shown as solid and dashed black arrows and labelled aB1, aR1, and aR2. The markers are the same as in Fig. 1. In addition to N2, the hot core N3 identified by Bonfand et al. (2017) is marked with a cyan tetragon. Blue and pink star markers indicate H2O maser spots (McGrath et al. 2004) with blue- and red-shifted velocities, respectively, with respect to 3sys ≡ 62 km s−1 . The HPBW is shown in the bottom-right corner of each panel. The position offsets are given with respect to the ReMoCA phase centre (black cross). The maps are not corrected for primary beam attenuation. -- astro-ph.GA

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

Shocking Sgr B2(N1) With Its Own Outflow: A New Perspective On Segregation Between O- and N-bearing Molecules

by Keith CowingOctober 21, 2023October 19, 2023

We want to investigate the influence of the powerful outflow driven by the hot core Sgr B2(N1) on the gas molecular inventory of the surrounding medium.

(a) Calibrated ALMA Band 7 (0.87 mm/343 GHz) image of Callisto’s leading hemisphere. (b) Result of subtracting a sample Lambertian disk from (a) to highlight difference in 𝑇𝑏 across the disk. In both images, the ellipse in the lower left corner represents the FWHM (full-width at half-maximum) of the synthesized ALMA beam. The latitude/longitude grid is spaced at 30◦ increments, and the 0◦ longitude line is marked with dashes. Callisto’s north pole is aligned with the image axis. Notably, the Valhalla impact crater appears slightly colder than other disk regions viewed at similar incident and emission angles. -- astro-ph.EP

Astrogeology, Callisto, Icy Worlds, Imaging & Spectroscopy, Status Report

Thermal Properties Of The Leading Hemisphere Of Callisto Inferred From ALMA Observations

by Keith CowingAugust 31, 2023August 30, 2023

We present a thermal observation of Callisto’s leading hemisphere obtained using the Atacama Large Millimeter/submillimeter Array (ALMA) at 0.87 mm (343 GHz). The angular resolution achieved for this observation was […]

Continuum emission image of high-mass star-formation region G358.93–0.03 at a wavelength of 988 µm. The synthesized beam size (white circle) of the continuum image is 0.412′′×0.363′′. The sub-millimeter continuum sources MM1–MM8 are located in the massive star-formation region G358.93–0.03. The contour (white colour) levels start at 3σ where σ is the RMS of the continuum emission image and the contour levels increase by a factor of √ 2. -- astro-ph.GA

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

Identification Of The Simplest Sugar-like Molecule Glycolaldehyde Towards The Hot Molecular Core G358.93-0.03 MM1

by Keith CowingAugust 30, 2023August 30, 2023

Glycolaldehyde (CH2OHCHO) is the simplest monosaccharide sugar in the interstellar medium, and it is directly involved in the origin of life via the ‘RNA world’ hypothesis.

A.1: Moment 0 maps of selected O-COMs in the representative source G19.88-0.53. Contours and beams are the same as those in Fig. 1. We chose the strongest and unblended (or less blended) line in the upper tuning to make moment 0 map of each species, of which the quantum numbers and the upper energy level are indicated by white bold text at the bottom of each panel. The images are integrated over the FWHM with respect to the line center. -- astro-ph.GA

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

CoCCoA: Complex Chemistry In Hot Cores With ALMA. Selected Oxygen-bearing Species

by Keith CowingAugust 9, 2023August 9, 2023

Complex organic molecules (COMs) have been observed to be abundant in the gas phase toward protostars. Deep line surveys have been carried out only for a limited number of well-known […]

Full MIRI/MRS spectrum of the Sz 98 disk. The extent per region is indicated, along with the detected species. The Spitzer LRS spectrum from the CASSIS database is shown in light grey (Lebouteiller et al. 2011). -- astro-ph.EP

Astrochemistry, Astronomy & Telescopes, Interstellar, Status Report

MINDS. Abundant Water And Varying C/O Across The Disk Of Sz 98 As Seen By JWST/MIRI

by Keith CowingJuly 19, 2023July 19, 2023

MIRI/MRS on board the JWST allows us to probe the inner regions of protoplanetary disks. Here we examine the disk around the classical T Tauri star Sz 98, which has […]

Integrated emission maps of NH2CN towards the G358.93–0.03 MM1. The emission maps were overlaid with the 1.37 mm continuum emission map (red contour). The contour levels are at 20%, 40%, 60%, 80%, and 100% of the continuum peak flux. The green circle indicated the synthesised beam of the integrated emission maps. -- astro-ph.GA

Astrochemistry, Status Report

Identification Of Interstellar Cyanamide Towards The Hot Molecular Core G358.93-0.03 MM1

by Keith CowingJuly 8, 2023July 8, 2023

The amide-related molecules are essential for the formation of the other complex bio-molecules and an understanding of the prebiotic chemistry in the interstellar medium (ISM).

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

Complex Organic Molecules In A Very Young Hot Corino, HOPS 373SW

by Keith CowingJune 29, 2023

We present the spectra of Complex Organic Molecules (COMs) detected in HOPS 373SW with the Atacama Large Millimeter/submillimeter Array (ALMA). HOPS 373SW, which is a component of a protostellar binary […]

Located in the constellation Sagittarius, the young star HD 169142 is host to a giant protoplanet embedded within its dusty, gas-rich protoplanetary disk. This artist’s conception shows the Jupiter-like planet interacting with and heating nearby molecular gas, driving outflows seen in several emission lines, including those from shock-tracing molecules like SO and SiS, and the commonly seen 12CO and 13CO. Credit: ALMA (ESO/NAOJ/NRAO), M. Weiss (NRAO/AUI/NSF)

Astrochemistry, Astrogeology, Astronomy & Telescopes, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Press Release

A Surprise Chemical Find by ALMA At HD 169142 May Help Detect and Confirm Protoplanets

by Keith CowingJune 29, 2023June 29, 2023

Scientists using the Atacama Large Millimeter/submillimeter Array (ALMA) to study the protoplanetary disk around a young star have discovered the most compelling chemical evidence to date of the formation of […]

ALMA

The GUAPOS Project: G31.41+0.31 Unbiased ALMA Spectral Observational Survey. IV. Phosphorus-bearing Molecules And Their Relation With Shock Tracers

Tentative Detection Of Cyanoformamide NCCONH2 In Space

Shocking Sgr B2(N1) With Its Own Outflow: A New Perspective On Segregation Between O- and N-bearing Molecules

Thermal Properties Of The Leading Hemisphere Of Callisto Inferred From ALMA Observations

Identification Of The Simplest Sugar-like Molecule Glycolaldehyde Towards The Hot Molecular Core G358.93-0.03 MM1

CoCCoA: Complex Chemistry In Hot Cores With ALMA. Selected Oxygen-bearing Species

MINDS. Abundant Water And Varying C/O Across The Disk Of Sz 98 As Seen By JWST/MIRI

Identification Of Interstellar Cyanamide Towards The Hot Molecular Core G358.93-0.03 MM1

Complex Organic Molecules In A Very Young Hot Corino, HOPS 373SW

A Surprise Chemical Find by ALMA At HD 169142 May Help Detect and Confirm Protoplanets

ExoPAG 35 – Early Career Talks Invitation

Missed Detections and False Alarms in a CNN Technosignature Detector on Breakthrough Listen Data

Ancient Clays Near The Hellas Basin On Mars

A Hydrogen Atmosphere Could Keep Exomoons Habitable For Billions Of Years

Ring Pattern Reveal The Mechanism By Which Unseen Planets And Dust Particles Gather On Their Own