RAS Journals

Isolated DORCHA haloes along with the parent DORCHA _ 00: the subplots show the total projection along the z-direction for the simulations. Please see the paper for the full caption.

Published in #MNRAS: "The DORCHA suite: nature, nurture, and the phase-space distribution of the Milky Way’s high-redshift progenitors today", Balu et al. Please visit academic.oup.com/mnras/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

Distribution of a dense seismic array on the lower Xishan Village landslide and hourly velocity changes measured from the individual coda wave packets at different time windows. (a) The 28 yellow thumbtacks mark the locations of the seismic stations, with blue and black straight lines indicating the station pair of Xs01-Xs11 and the electrical resistivity profile (show in fig. 5b) from D. Xu et al. (2016), respectively. (b) and (c) indicate that the hourly velocity changes measured by different individual coda wave packets. The black, blue and red curves represent the reference CCF (15 Hz, NE component), velocity change and cross-correlation coefficients for the station pair Xs01-Xs11, respectively. The green shaded windows the coda wave window in which the waves are treated as coda waves, while the red shaded windows depict the individual coda wave packet which are measured to find velocity change. There could be multiple coda wave packets in one coda wave window.

Published in #GJI Geophysical Journal International: "Enhanced visualization of rainfall infiltration in landslides using high-resolution 4-D noise-based velocity change imaging", Liu et al. This is Fig. 1: please visit academic.oup.com/gji/article/... to read the paper. @royalastrosoc.bsky.social

On #WorldBookDay here is the first printed edition of Euclid's 'Elements' (1482). There is also a connection with William Morris - the printer, Erhard Ratdolt, was an innovative printer whose designs influenced Morris's approach to typographical arts.

Earth’s atmospheric composition as an example of comparative biosignatures and habsignatures. Earth, situated within the HZ (green annulus sector), emerges as an outlier. Compared to the abiotic baseline established by Venus and Mars, Earth exhibits significantly lower CO_2 levels (P. van Thienen et al. 2007) and considerably higher O_2 levels (indicated below each planet). All of these gases have plausible abiotic origins, but the abiotic baseline informs our expectation and identifies Earth as anomalous.

Published in #MNRAS: "Comparative biosignatures with systemic retrievals", Constantinou et al. This is Fig. 1: please visit academic.oup.com/mnras/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

Experimental setup: (a) creation of the artificial soil samples. (b) sample packing under dry conditions. (c) saturation of samples. (d) desaturation by air injection. (e) weighing of samples. (f) SIP measurement.

Published in #GJI Geophysical Journal International: "Distinguishing water salinity, water saturation and clay content using spectral induced polarization: a tool for monitoring arid soil conditions", Iván et al. Read the paper at academic.oup.com/gji/article/... . @royalastrosoc.bsky.social

RASTI Student Prize: celebrating student research excellence!

The #RASTI Student Prize supports student researchers contributing to data-driven and technical advances in the physical sciences. If you are a student author, consider applying for this prestigious award!

🔗 oxford.ly/4sSoPQh
@rasjournals.bsky.social

Dust surface density of simulated discs with a = 0.1 mm. Please see the paper for the full caption.

Published in #MNRAS: "Dust morphology under changing dust mass ratios in protoplanetary discs", Murray et al. This is Fig. 1: please visit academic.oup.com/mnras/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

Geometry of events and receivers. Please see the paper for the full caption.

Average ultralow velocity zone thickness. Please see the paper for the full caption.

Published in #GJI Geophysical Journal International: "Ultralow velocity zones at the core–mantle boundary in the subduction regions consistent with the iron-rich origins revealed by ScP waveform complexities", Li et al. Please visit academic.oup.com/gji/article/... . @royalastrosoc.bsky.social

Top panel: composite image of GS-9209 obtained by the superposition of F090W, F200W, and F444W NIRCam photometry images. The dotted line is the effective FoV of our NIRSpec observations. A possible satellite is indicated. Bottom panel: zoomed-in portion of the same image, where we highlight the 0.35 arcsec x 0.35 arcsec aperture used for measuring the integrated stellar velocity dispersion. ⁠.

Published in #MNRAS: "When relics were made: vigorous stellar rotation and low dark matter content in the massive ultra-compact galaxy GS-9209 at z = 4.66", Pascalau et al. This is Fig. 1: please visit academic.oup.com/mnras/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

Surrogate soil OM mixture preparation workflow. Sample preparation is based on 3 steps: mixture, compaction and extrusion. SIP measurements configuration.

Published in #GJI Geophysical Journal International: "Investigations of compacted soil-organics mixtures with spectral induced polarization", Bore et al. This is Fig. 1: please visit academic.oup.com/gji/article/... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

Flowchart of the analysis presented in this work. Data products are indicated by rounded boxes, while discrete stages of our analysis are indicated with rectangular boxes.

Published in #RASTI RAS Techniques & Instruments: "StarDICE IV: correcting visible photometry from atmospheric grey extinction using thermal infrared observations", Sommer et al. This is Fig. 2: please visit academic.oup.com/rasti/articl... to read the paper. @royalastrosoc.bsky.social

Graphic promoting the 2026 Caroline Herschel Prize Lectureship.

We're now welcoming applications for the 2026 Caroline Herschel Prize Lectureship. 🔭🎓💫

Aimed at supporting promising women astronomers early in their careers, it was established by the Herschel Society and RAS to celebrate Caroline’s memory.

Apply now at: herschelsociety.org.uk/caroline-her...

The metallicity distribution of NGC 1385, computed using the O_3N_2 metallicity diagnostic of M. Curti et al. (2017). In this Figure, both a large scale trend in decreasing metallicity (corresponding to a negative metallicity gradient) and small-scale (sub-kpc) fluctuations (which we argue correspond to face-on superbubbles) can be seen.

Published in #MNRAS: "The ‘bubbly’ interstellar medium as origin for the inhomogeneous internal metallicity distributions in large disc galaxies", Metha et al. This is Fig. 2: please visit academic.oup.com/mnras/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

(a) Location of Lavey-les-Bains in the Rhône Valley, Switzerland. (b) Natural seismicity in Lavey-les-Bains and the surrounding region from 2000 to 2025 (green, SED/ETHZ). Seismicity occurring during the deployment is highlighted (violet circles). Circles with a radius of 2, 4 and 8 km around the Lavey-1 borehole (star) are shown. Current stations of the permanent SED network are indicated with triangles.

Published in #GJI Geophysical Journal International: "Large N-array and DAS around the Lavey geothermal reservoir in Switzerland in challenging topographic setting", Obermann et al. This is Fig. 1: please visit academic.oup.com/gji/article/... to read the paper. @royalastrosoc.bsky.social

We show simulations of 1,000,000 realizations of a cross-spectrum bin, here in an unaveraged (⁠⁠N = 1) case. Please see the paper for the full caption.

Published in #RASTI RAS Techniques & Instruments: "The statistical properties of the cross spectrum", Nathan et al. This is Fig. 1: please visit academic.oup.com/rasti/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

Promo graphic for RASreach 2026 at the University of Manchester on 27 March.

Want to join us at RASreach 2026? 🪐🔭🗣️

Bookings are now open for the one-day conference on science communication on 27 March, which is being hosted by @manchester.ac.uk in partnership with @royalastrosoc.bsky.social.

ℹ️ & 🎟️ at: ras.ac.uk/events-and-m...

Spitzer/IRAC mosaic of the Ser OB2 region in the 3.6 µ (blue), 5.8 µm (green), and 8.0 µm (red) bands. The yellow contours indicate the surface–density distribution of cluster members (Section 4), with the 60 x 60 pc box used for this analysis indicated (green rectangle). Several sub-regions are labelled.

Published in #MNRAS: "On the origin of kinematic structure in the young association Serpens OB", Kuhn et al. This is Fig. 1: please visit academic.oup.com/mnras/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

Map of the Bransfield Strait with the Central Bransfield Basin (CBB). Topography data are from the GMRT (Global Multi-Resolution Topography) data base (W.B.F. Ryan et al. 2009). Circles show broad-band OBS stations. Triangles mark stations of the onshore network, which could not be used for noise cross-correlations due to data gaps or large distances. Inverted triangles depict onshore stations used as reference stations. Arrows show noise cross-correlation pairs.

Published in #GJI Geophysical Journal International: "Correction of nonlinear clock drift: the BRAVOSEIS Ocean-Bottom Seismometer Network in the Bransfield Strait, Antarctica", Schmidt-Aursch et al. Please visit academic.oup.com/gji/article/... to read the paper. @royalastrosoc.bsky.social

Amazing work by a former student!

Professor Dame Carole Jordan.

We are saddened to hear of the death of Professor Dame Carole Jordan – the first female president of the @royalastrosoc.bsky.social.

Read more about her life and career: ras.ac.uk/news-and-pre...

New Special Issue: Genesis and Evolution of Organics in Space

Interstellar and circumstellar space is chemically rich, with more than 300 molecules detected to date. The special issue from MNRAS highlights breakthroughs on how organics form, survive, and evolve.

Browse the issue: oxford.ly/475WE6O
@rasjournals.bsky.social

High-resolution LOFAR HBA image of the tailed radio galaxy (C) in the galaxy cluster MACS J1354.6+7715, observed at 144 MHz. A and B denotes two compact radio sources, while D marks an additional radio source detected in the field. Please see the paper for the full caption.

Composite image of the cluster combining optical, radio, and X-ray data. Please see the paper for the full caption.

Published in #MNRAS: "Wiggling through the ICM: multiresolution radio imaging of a tailed radio galaxy in MACS J1354.6+7715", Gani et al. These are Figs. 1 & 6: please visit academic.oup.com/mnras/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

(a) The Iranian plateau and its seismotectonic settings. The Kirkuk Embayment (K.E.), Lurestan Arc (L.A.), Dezful Embayment (D.E.) and Fars Arc (F.A.) from NW to SE are four tectonostratigraphic domains of the most active part of the Zagros (the Simply Folded Belt). Grey lines depict the main active faults of this plateau and the Gotvand area is outlined by the white rectangle. Yellow and blue triangles indicate the IRSC and IIEES stations, respectively. (b) Zoom on the Gotvand area. Black lines show major mapped active faults. Large green squares indicate major cities, the small green squares depict small towns, and the black triangles indicate the location of seismic stations of the Gotvand local seismological networks. Red circles in both panels are M > 5.0 earthquakes during 1900– 2022 from the USGS catalogue. Red circles with white stars inside them in panel (b) are M > 5.0 earthquakes since 2002 in the area from the USGS catalogue.

Published in #GJI Geophysical Journal International: "Reservoir related seismicity changes around the Gotvand Dam (south west of Iran)", Asayesh et al. This is Fig. 1: please visit academic.oup.com/gji/article/... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

A comparison of the locations of four global 21 cm experiments with the maximal declination of the moon over a period of approximately 40 yr. Maximal lunar declination is shown as a continuous blue line, and the shaded blue area describes all possible lunar declinations over the course of a tropical month. The red band indicates a declination of ±0.5° around Sagittarius A*, describing the galactic bulge. Site latitudes are indicated by a grey line with varying styles. For this work, we chose to look at the MIST Deep Springs Valley site as it is the closest of the MIST sites to the equator, though it should be noted that MIST is an experiment designed to be mobile and is not fixed in one locale.

Published in #MNRAS: "Quantifying the impact of lunar and planetary occultation on experimental global 21 cm cosmology", Pattison et al. This is Fig. 1: please visit academic.oup.com/mnras/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

Map of wind farm (WF) Tegelberg, located east of the municipality of Kuchen on the escarpment of the eastern Swabian Alb in the federal state of Baden-Württemberg, Southwest Germany (see upper map inset, dark grey patch). Please see the paper for the full caption.

Published in #GJI Geophysical Journal International: "Machine learning for data-driven pattern recognition of seismic wind turbine emissions", Gärtner et al. This is Fig. 1: please visit academic.oup.com/gji/article/... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

The evolution of the spatial distribution of GES stars with different infall orbital energies. Please see the paper for the full caption.

Published in #MNRAS: "From order to chaos: the blurred out metallicity gradient of the Gaia-Enceladus/Sausage progenito", Carrillo et al. This is Fig. 4: please visit academic.oup.com/mnras/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

An image of the Moho depth estimate obtained from the steepest gradient of the v_s model that is the average over the 500 best-fitting models. At each station location the indicated Moho depth is the median value of the local Moho depth estimate and its two nearest neighbours. The colour range follows A. Nouibat et al. (2023) for comparison. The boundaries of the tectonic provinces in the Alps are from S. Schmid et al. (2004) and M.R. Handy et al. (2019).

Published in #GJI Geophysical Journal International: "Rayleigh-wave focal spot imaging of the European Alps and surrounding areas", Tsarsitalidou et al. This is Fig. 7: please visit academic.oup.com/gji/article/... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

The peak main beam temperature maps of the CMZ before smoothing for the transitions and isotopologues of CO. Please see the paper for the full caption.

Published in #MNRAS: "CHIMPS2: the physical properties and star formation efficiency of molecular gas in the central molecular zone", King et al. This is Fig. 1: please visit academic.oup.com/mnras/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

Tectonic features of the study region. Orange lines on Nazca plate are seafloor age in m.y. from M. Seton et al. (2020). Blue lines on Nazca plate outline the Juan Fernández Ridge (JFR) (L. Lara et al. 2018). White lines: contours to top of Nazca slab from G.P. Hayes et al. (2018). White triangles with red borders: Holocene volcanic centres (R. Global Volcanism Program 2024). Inverted purple triangles: CHILLAX station locations (D. Comte et al. 2019). White squares: population centres, labelled; aquamarine square: town of Illapel. Large red/yellow star: Illapel earthquake epicentre (U.S. Geological Survey 2015). Note the location of the flat slab region with respect to the JFR and the gap in Holocene volcanoes.

Published in #GJI Geophysical Journal International: "Attenuation tomographic mapping of interplate asperities in the rupture region of the 2015 MW 8.3 Illapel, Chile, Earthquake", Kelly & Russo. Please visit academic.oup.com/gji/article/... to read the paper. @royalastrosoc.bsky.social

Call for papers : Habitable World Observatory Mission Concept

🛰️ Attention researchers in astrophysics, instrumentation, and mission design! 📢 Submit your work, reviews, or short communications to #RASTI for the Habitable World Observatory Mission.

🗓 Deadline: Aug 31, 2026.
🔗 oxford.ly/4r4rYKJ
@rasjournals.bsky.social
#Exoplanets #Astrophysics