Tessera

RAS Journals

@rasjournals.bsky.social

Official account for Monthly Notices of the Royal Astronomical Society (MNRAS), Geophysical Journal International (GJI) and RAS Techniques and Instruments (RASTI). See also https://academic.oup.com/rasjournals

1382 Posts787 Follower 566 Folgt

RAS Journals @rasjournals.bsky.social · 14h ago

Published in #MNRAS: "The Cliff: a metal-poor little red dot hosting an overmassive black hole at z = 3.55", Ivey et al. This is Fig. 1: please visit academic.oup.com/mnras/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

False-colour RGB image of The Cliff, illustrating the NIRSpec/IFS FoV. We label a foreground galaxy (ID 24647, at ⁠z_(spec) = 3.05) to the east and a star to the north west. We use publicly available imaging from PRIMER (PID 1837) and MINERVA (PID 7814; A. Muzzin et al. 2025).

RAS Journals @rasjournals.bsky.social · 15h ago

Published in #GJI Geophysical Journal International: "Implementing three-dimensional Earth models for wavefield simulations and seismic moment tensor estimation", McPherson et al. Please visit academic.oup.com/gji/article/... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

The spatial extent of the velocity models chosen for this study. (a) Blue is AKAN (A. Nayak et al. 2020), grey is AKEP (A. Nayak et al. 2020), green is Berg (E.M. Berg et al. 2020), orange is WARD (K.M. Ward & F.-C. Lin 2018), and cyan is YANG (X. Yang & H. Gao 2020). The inverted triangles show the seismic stations (channels BHZ and HHZ) that were active any time from 2019-01-01 to 2024-06-01 for Alaska and western Canada, though we only downloaded data for the broad-band stations. The white line shows the extent of the SPECFEM3D Globe mesh. (b) The mean shear wave velocity at each depth layer that the model is defined at. We have also shown the shear wave velocities used to construct the two FK databases we use in the 1-D moment tensor inversions, SCAK and TACTMOD in magenta. (c) The same as (b), but for P-wave velocity. (WARD does not include P-wave velocity.)

RAS Journals @rasjournals.bsky.social · 15h ago

Published in #RASTI RAS Techniques & Instruments: "phoptic – a Python package for reducing astronomical images", Irving et al. This is Fig. 1: please visit academic.oup.com/rasti/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

Minimal workflow for reducing OPTICAM data with phoptic. Dashed boxes represent optional, but highly recommended, steps.

Oxford Academic @academic.oup.com · yesterday

What can studying our Sun tell us about stars across the Universe? ☀️ Explore how researchers use our nearest star to unlock bigger astrophysical questions in the new #MNRAS virtual collection from @rasjournals.bsky.social. Learn more: academic.oup.com/mnras/pages/...

MNRAS Virtual Collection: The Sun As A Star. Explore the collection. Learn more. Royal Astronomical Society. OUP

RAS Journals @rasjournals.bsky.social · 2d ago

Published in #MNRAS: "Deep MUSE observations of SNR 0509–67.5 reveal a double-degenerate merger progenitor", Das et al. This is Fig. 1: please visit academic.oup.com/mnras/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

Doppler maps of ejecta emitting in [Fe XIV] in SNR 0509, calculated using a rest wavelength of 5308 Å, are shown separately. Left: The red-shifted ejecta, showing lower Doppler velocities along the edges. Right: The blue-shifted component of the ejecta, which also shows lower Doppler velocities in the western region of the remnant, likely linked to a denser ambient medium. H (appearing as the outer shell) is overlaid in magenta to show the full extent of SNR 0509.

RAS Journals @rasjournals.bsky.social · 2d ago

Published in #GJI Geophysical Journal International: "Platform-corrected analyses of near-bottom magnetic data acquired by autonomous underwater vehicles", Ingale et al. This is Fig. 4: please visit academic.oup.com/gji/article/... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

Portion of time-series data (2000 s) collected through a turn during AUV Sentry dive 750. (a) Magnetic field in vehicle (XYZ component) reference frame. (b)–(d) Measured, heading corrected and filtered magnetic data in geographic (NED component) reference frame. (e) Vehicle attitude: heading, pitch and roll. Grey shaded area shows turn along survey line.

RAS Journals @rasjournals.bsky.social · 2d ago

Published in #RASTI RAS Techniques & Instruments: "Quantitative analysis of the influence of solar cycle variations on timing, number, and magnitude of Forbush events at Moscow and Oulu stations", Okike & Onah. Read the paper at academic.oup.com/rasti/articl... @royalastrosoc.bsky.social

Monthly average Mount Washington neutron monitor counting rate as a function of time. Rate normalized to 100–2506 in July 1954. The upper panel shows the occurrence and magnitude of FDs with magnitude ≤ 3 per cent as recorded by the Mount Washington neutron monitor [from J. A. Lockwood & W. R. Webber (1984)].

RAS Journals @rasjournals.bsky.social · 3d ago

Published in #MNRAS: "Optical outburst evolution of the transient black hole X-ray binary Swift J1727.8−1613: disc response to jet ejections and late-outburst emergence of powerful disc winds", Castro Segura et al. Read the paper at academic.oup.com/mnras/articl... . @royalastrosoc.bsky.social

RAS Journals @rasjournals.bsky.social · 3d ago

Published in #GJI Geophysical Journal International: "The effect of grain-size distribution on shear wave velocity in methane hydrate-bearing sands", Liu et al. This is Fig. 1: please visit academic.oup.com/gji/article/... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

Schematic diagram of the experimental setup. ⁠P, T⁠, V⁠, R_t and W represent pressure, temperature, ultrasonic wave velocity, resistivity and waveforms, respectively. After T. Liu et al. (2026).

Oxford Academic @academic.oup.com · 5d ago

We're delighted to celebrate the winner of the MNRAS Student Prize 2026 🎉 This award recognises outstanding student contributions to astronomy research by #MNRAS Find out more: academic.oup.com/mnras/pages/... @rasjournals.bsky.social

MNRAS student prize 2026. Monthly Notices of the Royal Astronomical Society are pleased to announce this year's winner. Learn more.

RAS Journals @rasjournals.bsky.social · 6d ago

Published in #MNRAS: "Numerical simulations of η Carinae–II. Reconsidering the Great Eruption of the 19th century", González et al. This is Fig. 1: please visit academic.oup.com/mnras/articl... to read the paper. @royalastrosoc.bsky.social @astrolibrarian.bsky.social @academic.oup.com

Logarithmic density map of η Car’s nebula. The numerical simulation corresponds to an evolutionary time of t = 161 yr since the Great Eruption of the 1840s. The colour bar on the right is given in units of g cm⁠^(-3), and the axes of the computational domain are in units of cm. A physical description of the figure is provided in the text.

RAS Journals @rasjournals.bsky.social · 6d ago

Published in #GJI Geophysical Journal International: "Constraining mantle viscosity using dynamic topography, the geoid, and seismic heterogeneity from high-resolution mantle circulation models", Brown et al. Visit academic.oup.com/gji/article/... to read the paper. @royalastrosoc.bsky.social

Example of dynamic topography filtering for Model 5A. The full model dynamic topography field is sampled using the observed residual topography data points (M.J. Hoggard et al. 2016, 2017; M.C. Holdt et al. 2022; S.N. Stephenson et al. 2024) to generate synthetic data. A spherical harmonic expansion is then fitted to both observed and synthetic data following M.J. Hoggard et al. (2016). This results in global dynamic topography fields that are directly comparable.

RAS Journals @rasjournals.bsky.social · 7d ago

Published in #MNRAS: "A search for circumstellar gas in pre-main-sequence debris discs using absorption spectroscopy", Szewczyk et al. This is Fig. 2: please visit academic.oup.com/mnras/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

Figure 2: please see the paper for the full caption.

RAS Journals @rasjournals.bsky.social · 7d ago

Published in #GJI Geophysical Journal International: "On the origin of mid-mantle discontinuities beneath the Central Pacific as revealed by long-period SS and PP precursors", Carr et al. This is Fig. 13: please visit academic.oup.com/gji/article/... to read the paper. @royalastrosoc.bsky.social

Conceptual schematic of mid-mantle stratification and the ‘density paradox’. This synthesis illustrates the interpretation of the ≈ 800 km discontinuity as a laterally extensive layer of stagnant, eclogitized oceanic crust accumulated near a viscosity barrier at 1000 km depth, thermally equilibrated with the ambient mantle such that chemical and thermal buoyancy approximately cancel. Subducting slab delivers basaltic crust which transforms to eclogite and accumulates as marble-cake remnants.

RAS Journals @rasjournals.bsky.social · last wk.

Published in #MNRAS: "Sarcopside and low crystallization temperatures of clasts in Martian regolith breccia meteorite: implications for evolved melts on early Mars", Shang et al. Please visit academic.oup.com/mnras/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

$Images of the clast containing sarcopside (CS) in Martian meteorite Northwest Africa (NWA) 7533. (a) BSE image of clast CS outlined by a dotted line. (b–e) X-ray images of clast CS. (f) BSE image of a sarcopside grain cut through by an impact fracture. Src = sarcopside, Ap = apatite, Pl = plagioclase, Afs = alkali feldspar.$

RAS Journals @rasjournals.bsky.social · last wk.

Published in #GJI Geophysical Journal International: "Seismicity and hydromechanical coupling along strike-slip faults in flat-and-ramp structures: the case of the Vuache Fault in the Annecy Molasse Basin (French western Alps)", Got et al. academic.oup.com/gji/article/... @royalastrosoc.bsky.social

Simplified structural map of the western Alps. Dashed lines represent the directions of the cross-sections: A (Fig. C1) and B (Fig. 4). The study area is represented by the black solid rectangle of the right panel.

RAS Journals @rasjournals.bsky.social · last wk.

Published in #RASTI RAS Techniques & Instruments: "Digital beam pattern optimization for the GRAO 32-m telescope: a comparative analysis of FIR filter design methods", Ansah-Narh et al. This is Fig. 1: please visit academic.oup.com/rasti/articl... to read the paper. @royalastrosoc.bsky.social

Geometrical model of a parabolic reflector antenna showing the segmented surface mesh and the primary feed support structure. The coordinate systems (X, Y, and Z axes) indicate the global and local phase centres for the optical analysis.

Royal Astronomical Society @royalastrosoc.bsky.social · last wk.

We are saddened to hear of the death of Professor Ralph A.M.J. Wijers, who was a member of the Editorial Board of Monthly Notices of the Royal Astronomical Society. Read more about Professor Wijers' career here: ras.ac.uk/news-and-pre...

Astronomer Royal for Scotland | Catherine Heymans @astroroyalscot.bsky.social · last wk.

This is what it will look like, once it's finished 🥳

RAS Journals@rasjournals.bsky.social · 9mo ago

Published in #RASTI RAS Techniques & instruments: "RHINO: a large horn antenna for detecting the 21 cm global signal", Bull et al. This is Fig. 1: to read the paper please visit academic.oup.com/rasti/articl... @oxfordacademic.bsky.social @royalastrosoc.bsky.social

(Left): Dimensions of the pyramidal horn that was selected as the reference design. The flare section has an aperture of 7.3 x 6.0 m, an edge slant length of 5.099 m, and an overall vertical height of 4.3 m. The rectangular waveguide section has an aperture of m and a height of 2.997m. The horn will be static, pointing at zenith, and will have a welded mesh conductive surface. The location of the feed is marked on the waveguide. (Right): Detailed design drawing showing the multipanel construction, consisting of 2.4 x 1.2 m mesh panels cut to size/shape and welded into steel angle frames. These are then bolted together to form a self-supporting structure.

RAS Journals @rasjournals.bsky.social · last wk.

Published in #MNRAS: "The influence of solar irradiation and solar wind conditions on heavy ion escape from Venus", Zhang et al. This is Fig. 6: please visit academic.oup.com/mnras/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

The total current (a –d), magnetic field (e–h) and O^+ density (i–l) distributions for the four cases presented in Fig. 5. The plots are sliced in the XY plane at Z = 0 in the VSO coordinate system. Black arrows indicate the directions of the current (a–d), magnetic field (e–h) and ion flow (i–l).

RAS Journals @rasjournals.bsky.social · last wk.

Published in #GJI Geophysical Journal International: "Moment tensor inversion and uncertainty analysis of earthquakes in Garhwal–Kumaon Himalayas", Mahanta et al. This is Fig. 1: please visit academic.oup.com/gji/article/... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

Map highlighting the seismicity and seismic networks of the study region. The area within the brown box indicates the GK region of the Himalayan arc. The seismicity includes earthquakes from 2010 to 2022 with magnitude ranging from 2–5.6 (ISC catalogue). The size and the colour contrast of the circles represent the magnitude and focal depth of the events, respectively. Red and green inverted triangles indicate the station locations of the Tehri Network (TN) and National Center of Seismology, India (IN) networks, respectively. The figure also marks the locations of some major cities (yellow rectangles) and significant faults and thrusts are marked by the blue lines (MFT: Main Frontal Thrust, MBT: Main Boundary Thrust, MT: Munsiari Thrust (MCT-I), VT: Vaikrita Thrust (MCT-II), SAT: South Almora Thrust, NAT: North Almora Thrust, RT: Ramgarh Thrust) within the arc (S. Dasgupta et al. 2000).

RAS Journals @rasjournals.bsky.social · last wk.

Published in #RASTI RAS Techniques and Instruments: "A new methodology for classifying eclipsing binaries with Kepler data and deep learning", Mondal et al. This is Fig. 2: please visit academic.oup.com/rasti/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

The chi-square versus box size plots for nine different EBs are shown. The top row (a, b, c panels) displays three different DEBs with Kepler IDs (KIC): 1026032, 1873513, and 2166200, respectively. The middle row (d, e, f panels) displays three different SDEBs with KIC: 2577756, 5560831, and 5962514, respectively. Lastly, the bottom row (g, h, i panels) displayed three CEBs systems with KIC: 1433410, 2012362, and 2159783, respectively.

astronomie.nl @astronomienl.bsky.social · 2w ago

In memoriam Ralph Wijers, astrofysicus (1964-2026) www.astronomie.nl/nieuws/in-me... English: In memoriam Ralph Wijers, astrophysicist (1964–2026) www.astronomie.nl/nieuws/en/in... 🔭

In memoriam Ralph Wijers, astrofysicus (1964-2026)

astronomie.nl

RAS Journals @rasjournals.bsky.social · last wk.

Published in #MNRAS: "Helical radio jets as probes of magnetized cluster environments: periodic Faraday rotation revealed in the Corkscrew Galaxy by POSSUM", Bradbury et al. This is Fig. 1: please visit academic.oup.com/mnras/articl... to read the paper. @royalastrosoc.bsky.social

Descriptive maps of the Corkscrew Galaxy. Please see the paper for the full caption.

RAS Journals @rasjournals.bsky.social · last wk.

Published in #GJI Geophysical Journal International: "Hellenic Arc tsunami generation from MW 8+ 3-D margin-wide dynamic rupture earthquake scenarios", Wirp et al. This is Fig. 1: please visit academic.oup.com/gji/article/... to read the paper. @royalastrosoc.bsky.social @academic.oup.com

Dynamic rupture modelling domain: (a) The Hellenic Arc megathrust by A. Scala et al. (2020) and R. Basili et al. (2021) used in this study. The dark red color indicates deeper fault depths. Note that the tsunami modelling computational domain extends beyond the dynamic rupture modelling domain (Figs. 3 and 4). (b) Zoom into the Hellenic Arc region with 5.4 earthquakes (red stars) related to the Hellenic Arc subduction or surrounding tectonics (R. Mallet 1853; J. Antonopoulos 1973; G. Papadopoulos 2000; E. Guidoboni et al. 2005; G.A. Papadopoulos et al. 2010; G.M. Bocchini et al. 2020; A. Cirella et al. 2020; K.H. Coban & N. Sayil 2020). Plate boundaries are indicated by black lines (P. Bird 2003), and the convergent subduction margin is marked by a black saw-toothed line.

RAS Journals @rasjournals.bsky.social · last wk.

Published in #RASTI RAS Techniques & Instruments: "ReLaTS: a reinforcement learning-based method for dynamically determining the coupling time-step in multiscale simulations of self-gravitating systems", Saz Ulibarrena & Portegies Zwart academic.oup.com/rasti/articl... @royalastrosoc.bsky.social

Schematic of the iBridge method as developed for this application. The system is divided into two parts: a star cluster and a planetary system, with one star being common for both parts. The acceleration caused by the cluster on the planetary system is calculated and used to update the velocities of the bodies in the planetary system. Then the planets and central star are evolved, and the state of the central star in the cluster is updated with that of the planetary system. Afterwards, the cluster is evolved and the state of the centre of mass of the planetary system is updated using the latest cluster information. This process is repeated at every step.

RAS Journals @rasjournals.bsky.social · 2w ago

Rahul Kumar is speaking at NAM 26 on "Spacetime measurement using black hole photon rings". Rahul is first author of "Time variability of TeV cosmic ray sky map" academic.oup.com/mnras/articl... #MNRAS @royalastrosoc.bsky.social

The magnitude of spatial separation between a pair of CR trajectories are shown as a function of time. Please see the paper for the full caption.

RAS Journals @rasjournals.bsky.social · 2w ago

Clara Pennock is speaking in one of the final sessions at NAM 26 on "Exploring the accretion, jet and host connection for X-ray- and radio-selected AGN". Clara is first author of academic.oup.com/mnras/articl... #MNRAS @royalastrosoc.bsky.social …

Exploring the X-ray–radio connection for AGNs via measurements of the multidimensional luminosity function

ABSTRACT. We present new methods to quantify the active galactic nucleus (AGN) population in terms of a multidimensional luminosity function that describes

academic.oup.com

RAS Journals @rasjournals.bsky.social · 2w ago

The final plenary speaker at NAM 26 is Marcia Rieke, speaking online from Arizona on "Finding the Most Distant Galaxies Using the James Webb Space Telescope". Marcia is a co-author on academic.oup.com/mnras/articl... #MNRAS @royalastrosoc.bsky.social …

Beyond the stars: Linking H α sizes, kinematics, and star formation in galaxies at z ≈ 4−6 with JWST grism surveys and geko

ABSTRACT. Understanding how galaxies assemble their mass during the first billion years of cosmic time is a central goal of extragalactic astrophysics, yet

academic.oup.com

RAS Journals @rasjournals.bsky.social · 2w ago

Leah K Morabito is our first plenary speaker at NAM today, speaking on "Active Galactic Nuclei: breaking new ground with high resolution radio surveys". Leah is first author of academic.oup.com/mnrasl/artic... #MNRAS @royalastrosoc.bsky.social …

A hidden active galactic nucleus population: the first radio luminosity functions constructed by physical process

ABSTRACT. Both star formation (SF) and active galactic nuclei (AGNs) play an important role in galaxy evolution. Statistically quantifying their relative i

academic.oup.com