bluuebunny/crossref_metadata_2025_split huggingface dataset:
AGN STORM 2. VII. A Frequency-resolved Map of the Accretion Disk in Mrk 817: Simultaneous X-Ray Reverberation and UVOIR Disk Reprocessing Time Lags
Authors: Lewin Collin , Kara Erin , Barth Aaron J. , Cackett Edward M. , De Rosa Gisella , Homayouni Yasaman , Horne Keith , Kriss Gerard A. , Landt Hermine , Gelbord Jonathan , Montano John , Arav Nahum , Bentz Misty C. , Boizelle Benjamin D. , Dalla Bontà Elena , Brotherton Michael S. , Dehghanian Maryam , Ferland Gary J. , Fian Carina , Goad Michael R. , Hernández Santisteban Juan V. , Ilić Dragana , Kaastra Jelle , Kaspi Shai , Korista Kirk T. , Kosec Peter , Kovačević Andjelka , Mehdipour Missagh , Miller Jake A. , Netzer Hagai , Neustadt Jack M. M. , Panagiotou Christos , Partington Ethan R. , Č. Popović Luka , Sanmartim David , Vestergaard Marianne , Ward Martin J. , Zaidouni Fatima 
Published: October 2024

Abstract
X-ray reverberation mapping is a powerful technique for probing the innermost accretion disk, whereas continuum reverberation mapping in the UV, optical, and infrared (UVOIR) reveals reprocessing by the rest of the accretion disk and broad-line region (BLR). We present the time lags of Mrk 817 as a function of temporal frequency measured from 14 months of high-cadence monitoring from Swift and ground-based telescopes, in addition to an XMM-Newton observation, as part of the AGN STORM 2 campaign. The XMM-Newton lags reveal the first detection of a soft lag in this source, consistent with reverberation from the innermost accretion flow. These results mark the first simultaneous measurement of X-ray reverberation and UVOIR disk reprocessing lags—effectively allowing us to map the entire accretion disk surrounding the black hole. Similar to previous continuum reverberation mapping campaigns, the UVOIR time lags arising at low temporal frequencies are longer than those expected from standard disk reprocessing by a factor of 2–3. The lags agree with the anticipated disk reverberation lags when isolating short-timescale variability, namely timescales shorter than the Hβ lag. Modeling the lags requires additional reprocessing constrained at a radius consistent with the BLR size scale inferred from contemporaneous Hβ-lag measurements. When we divide the campaign light curves, the UVOIR lags show substantial variations, with longer lags measured when obscuration from an ionized outflow is greatest. We suggest that, when the obscurer is strongest, reprocessing by the BLR elongates the lags most significantly. As the wind weakens, the lags are dominated by shorter accretion disk lags.
Measurements of Magnetic Cloud Expansion through Multiple Spacecraft in Radial Conjunction
Authors: Yu Wenyuan , Al-Haddad Nada , Farrugia Charles J. , Lugaz Noé , Zhuang Bin , Regnault Florian , Galvin Antoinette B. 
Published: October 2024

Abstract
The aim of this study is to use multispacecraft measurements of interplanetary magnetic clouds (MCs) to better constrain and understand the effect of expansion on their magnetic field properties. We develop a parameter (γ) for comparing magnetic field components measured at multiple spacecraft. We use the minimum variance technique on the magnetic field data to obtain the axial and azimuthal components. The parameter γ acts at the front boundary as a measure of the global difference in the evolution with heliospheric distance of the axial and azimuthal magnetic field components of MCs. Our goal is to determine whether the studied MCs exhibit self-similar expansion and, if so, whether this expansion is predominantly isotropic or radial, based on the estimated γ. Through our analysis of data from multiple spacecraft, we observe a notable consistency in the γ values across the examples examined. We find that the overall expansion of these MCs tends to be isotropic, while the local expansion of MCs, derived from the γ values measured at the rear boundary of MCs, usually shows anisotropic behavior, particularly when the distances between the observations from the two spacecraft are relatively short. This discovery offers insights for refining flux rope models and advancing our comprehension of the expansion processes associated with coronal mass ejections.
Optical Continuum Reverberation Mapping of a Candidate IMBH in a Nearby Seyfert 1 Galaxy
Authors: Zuo Wenwen , Guo Hengxiao , Sun Jingbo , Yuan Qi , Lira Paulina , Gu Minfeng , Edwards Philip G. , Gupta Alok C. , Kishore Shubham , Stevens Jamie , An Tao , Cai Zhen-Yi , Feng Hai-Cheng , Ho Luis C. , Ilić Dragana , Kovačević Andjelka B. , Li Sha-Sha , Mezcua Mar , Č. Popović Luka , Sun Mouyuan , Tripathi Tushar , U Vivian , Vince Oliver , Wang Jianguo , Wang Junxian , Wang Shu , Wu Xuebing , Zheng Zhenya 
Published: October 2024

Abstract
To investigate the short-term variability and determine the size of the optical continuum emitting region of intermediate-mass black holes (IMBHs), we carried out high-cadence, multiband photometric monitoring of a Seyfert 1 galaxy J0249−0815 across two nights, together with a one-night single-band preliminary test. The presence of the broad Hα component in our target was confirmed by recent Palomar/P200 spectroscopic observations, 23 yr after the Sloan Digital Sky Survey, ruling out the supernovae origin of the broad Hα line. The photometric experiment was primarily conducted utilizing four-channel imagers MuSCAT 3 and 4 mounted on 2 m telescopes within the Las Cumbres Observatory Global Telescope Network. Despite the expectation of variability, we observed no significant variation (<1.4%) on timescales of 6–10 hr. This nondetection is likely due to substantial host galaxy light diluting the subtle active galactic nucleus (AGN) variability. Additionally, we cannot rule out that the target was in a relatively quiescent state without intranight variability during our monitoring, owing to the stochastic nature of AGN variations. To enhance the possibility of detecting subtle variability signals and lag in future IMBH reverberation campaigns, it may be beneficial to select targets with a higher AGN-to-host flux ratio, and conduct dual-band preliminary tests and tailored simulations.
Toward Accelerated Nuclear-physics Parameter Estimation from Binary Neutron Star Mergers: Emulators for the Tolman–Oppenheimer–Volkoff Equations
Authors: Reed Brendan T. , Somasundaram Rahul , De Soumi , Armstrong Cassandra L. , Giuliani Pablo , Capano Collin , Brown Duncan A. , Tews Ingo 
Published: October 2024

Abstract
Gravitational-wave observations of binary neutron-star (BNS) mergers have the potential to revolutionize our understanding of the nuclear equation of state (EOS) and the fundamental interactions that determine its properties. However, Bayesian parameter estimation frameworks do not typically sample over microscopic nuclear-physics parameters that determine the EOS. One of the major hurdles in doing so is the computational cost involved in solving the neutron-star structure equations, known as the Tolman–Oppenheimer–Volkoff (TOV) equations. In this paper, we explore approaches to emulating solutions for the TOV equations: multilayer perceptrons (MLPs), Gaussian processes, and a data-driven variant of the reduced basis method (RBM). We implement these emulators for three different parameterizations of the nuclear EOS, each with a different degree of complexity represented by the number of model parameters. We find that our MLP-based emulators are generally more accurate than the other two algorithms, whereas the RBM results in the largest speedup with respect to the full high-fidelity TOV solver. We employ these emulators for a simple parameter inference using a potentially loud BNS observation and show that the posteriors predicted by our emulators are in excellent agreement with those obtained from the full TOV solver.
A Millimeter Rebrightening in GRB 210702A
Authors: de Wet Simon , Laskar Tanmoy , Groot Paul J. , Barniol Duran Rodolfo , Berger Edo , Bhandari Shivani , Eftekhari Tarraneh , Guidorzi Cristiano , Kobayashi Shiho , Perley Daniel A. , Sari Re’em , Schroeder Genevieve 
Published: October 2024

Abstract
We present X-ray to radio frequency observations of the bright long gamma-ray burst GRB 210702A. Our Atacama Large Millimeter/submillimeter Array 97.5 GHz observations show a significant rebrightening by a factor of ≈2 beginning at 8.2 days post-burst and rising to peak brightness at 18.1 days before declining again. This is the first such rebrightening seen in a millimeter afterglow light curve. A standard forward shock model in a stellar wind circumburst medium can explain most of our X-ray, optical, and millimeter observations prior to the rebrightening, but significantly overpredicts the self-absorbed radio emission, and cannot explain the millimeter rebrightening. We investigate possible explanations for the millimeter rebrightening, and find that energy injection or a reverse shock from a late-time shell collision are plausible causes. Similar to other bursts, our radio data may require alternative scenarios such as a thermal electron population or a structured jet to explain the data. Our observations demonstrate that millimeter light curves can exhibit some of the rich features more commonly seen in optical and X-ray afterglow light curves, motivating further millimeter wavelength studies of GRB afterglows.
Five New Heartbeat Star Systems with Tidally Excited Oscillations Discovered Based on TESS Data
Authors: Li Min-Yu , Qian Sheng-Bang , Zhou Ai-Ying , Zhu Li-Ying , Liao Wen-Ping , Zhao Er-Gang , Shi Xiang-Dong , Li Fu-Xing , Sun Qi-Bin 
Published: October 2024

Abstract
Heartbeat stars (HBSs) with tidally excited oscillations (TEOs) are ideal astrophysical laboratories for studying the internal properties of the systems. In this paper, five new HBSs exhibiting TEOs are discovered using TESS photometric data. The orbital parameters are derived using a corrected version of Kumar et al.'s model based on the Markov Chain Monte Carlo method. The TEOs in these objects are examined, and their pulsation phases and modes are identified. The pulsation phases of the TEOs in TIC 266809405, TIC 266894805, and TIC 412881444 are consistent with the dominant l = 2, m = 0, or ±2 spherical harmonic. For TIC 11619404, although the TEO phase is close to the m = +2 mode, the m = 0 mode cannot be excluded because of the low inclination in this system. The TEO phase in TIC 447927324 shows a large deviation (>2σ) from the adiabatic expectations, suggesting that it is expected to be a traveling wave or that the pulsations are nonadiabatic. In addition, these TEOs occur at relatively low orbital harmonics, and we cautiously suggest that this may be an observational bias. These objects are valuable sources for studying the structure and evolution of eccentricity orbit binaries and extending the TESS HBS catalog with TEOs.
Contribution of the Cygnus Bubble to the Galactic Cosmic Ray Spectrum and Diffuse γ-Ray Emissions
Authors: Nie Lin , Qian Xiang-Li , Guo Yi-Qing , Liu Si-Ming 
Published: October 2024

Abstract
Since the discovery of cosmic rays (CRs) over a century ago, their origin has remained a mystery and a key research question. Recently, the LHAASO experiment identified the first CR superacceleration source, the Cygnus bubble, which can accelerate CRs to energies exceeding 10 PeV. A pertinent question is how much the Cygnus bubble contributes to the CR spectrum observed on Earth. With the aim of answering that question, a 3D propagation analysis was conducted on CRs in this study. The Cygnus bubble was incorporated into our propagation model in order to determine its contributions to the observed spectra. First, we calculated the spectrum and spatial morphology of the Cygnus bubble to reproduce the observed LHAASO data. Subsequently, we calculated the diffuse γ-ray emissions produced by the CRs from the Cygnus bubble and the energy spectrum of the CR particles near Earth after propagation. Finally, we utilized a CR spatial-dependent propagation model to calculate the large-scale CR energy spectrum and the resulting diffuse γ-ray emissions. Our results indicate that (1) the Cygnus bubble contributes minimally to the CR spectrum observed on Earth, (2) the emissions produced by the CR particles from the Cygnus bubble dominate the diffuse γ-ray emissions in that region, and (3) the structural fluctuations of the diffuse γ-ray emissions observed by LHAASO are likely due to the local CR halo. We anticipate that LHAASO will identify more CR halo sources to validate our model.
Linking High-z and Low-z: Are We Observing the Progenitors of the Milky Way with JWST?
Authors: Rusta Elka , Salvadori Stefania , Gelli Viola , Koutsouridou Ioanna , Marconi Alessandro 
Published: October 2024

Abstract
The recent JWST observation of the Firefly Sparkle at z = 8.3 offers a unique opportunity to link the high- and the low-z Universe. Indeed, the claim of it being a Milky Way (MW) type of assembly at the cosmic dawn opens the possibility of interpreting the observation with locally calibrated galaxy-formation models. Here, we use the a state-of-the-art MW-evolution model to perform forward modeling of our Galaxy's progenitors at high-z. We build a set of mock spectra for the MW building blocks to make predictions for JWST and to interpret the Firefly Sparkle observation. First, we find that the most massive MW progenitor becomes detectable in a deep survey like JADES from z ≈ 8.2, meaning that we could have already observed MW analogs that still need interpretation. Second, we provide predictions for the number of detectable MW progenitors in lensed surveys like the CAnadian NIRISS Unbiased Cluster Survey, and interpret the Firefly Sparkle as a group of MW building blocks. Both the number of detections and the observed NIRCam photometry are consistent with our predictions. By identifying the MW progenitors whose mock photometry best fits the data, we find bursty and extended star formation histories, lasting >150–300 Myr, and estimate their properties: M

h
≈ 108−9
M
⊙, M
⋆ ≈ 106.2−7.5
M
⊙, SFR ≈ 0.04–0.20 M
⊙ yr−1, and Z
gas ≈ 0.04–0.24 Z
⊙. Uncovering the properties of MW analogs at cosmic dawn by combining JWST observations and locally constrained models will allow us to understand our Galaxy's formation, linking the high- and low-z perspectives.
Performance in the recruitment life stage and its potential contribution to invasive success in the polyploid invader Centaurea stoebe
Authors: Kožić Kevin , Hartmann Matthias , Callaway Ragan M. , Hensen Isabell , Nagy Dávid U. , Mráz Patrik , Al-Gharaibeh Mohammad M. , Bancheva Svetlana , Diaconu Alecu , Danihelka Jiří , Ensing David J. , Filep Rita , Gudžinskas Zigmantas , Hajdari Avni , Nicoară Roxana , Lachmuth Susanne , Moffat Chandra E. , Novikov Andriy , Purger Dragica , Slate Mandy L. , Synowiec Agnieszka , Vonica Ghizela D. , Zuleger Annika M. , Rosche Christoph 
Published: October 2024

The recruitment life stage, including germination and early seedling establishment, is the most vulnerable life stage of plants and has cascading effects on plant performance at later life stages. However, surprisingly little is known on the eco-evolutionary processes that determine the success of biological invasions at this life stage.
We performed germination experiments with and without simulated drought stress and monitored early seedling growth in diploid and tetraploid Centaurea stoebe. While diploids are the major cytotype in the native European range, only tetraploids became invasive in North America. Thus, C. stoebe is an excellent model species to simultaneously study both, pre-adaptive differences in the native range (diploids vs. tetraploids) and post-introduction evolution in the non-native range (native tetraploids vs. non-native tetraploids). To account for broad spatial-environmental variation within cytotypes and ranges, we germinated 23,928 seeds from 208 widely distributed populations.
Tetraploids germinated better than diploids. Within tetraploids, invasive populations outperformed native populations in germination. However, these differences were not evident under simulated drought stress. Seedlings of invasive tetraploids had a higher biomass and developed the first true leaf earlier than those from the native range, while the native cytotypes did not differ in these early seedling traits.
Our results suggest that a combination of pre-adaptation related to superior performance of polyploids (greater and faster germination) and post-introduction evolution towards higher performance in the invasive range (greater and faster germination, greater and faster accumulation of seedling biomass) may have contributed to the invasion success of tetraploid C. stoebe in North America.
Chantal Akerman / Babette Mangolte : éclairer les films d’une cinéaste naissante – la possibilité d’une œuvre
Authors: Lamoine Émilie 
Published: October 2024

La photographe, opératrice et réalisatrice expérimentale franco-américaine Babette Mangolte (1941-) a éclairé ou fut cheffe opératrice de six films de la cinéaste belge Chantal Akerman (1950-2015) à ses débuts : La chambre (1972), Hotel Monterey (1972), Hanging out Yonkers (1973, inachevé), Jeanne Dielman. 23, quai du Commerce, 1080 Bruxelles (1975), News from Home (1976) et Un jour, Pina a demandé… (1983). Se rencontrant à New York en 1971, elles élaborent ensemble un mode de fabrication, technique et esthétique, qui permet à la cinéaste émergente d’exprimer un rapport au temps et à l’espace que le corps habite. Leur collaboration, née de leur amitié sororale, a donné à son œuvre la possibilité d’avoir lieu, en trouvant la façon qui lui est propre de se faire. Nous en traçons le récit, focalisé sur la période 1972-1976, en nous appuyant sur leurs paroles et écrits, et en interrogeant la façon dont celui-ci a été constitué par celles qui ont partagé cette histoire.
Paint Composition and Delamination Concerns in Ole Schwalbe’s Portrait of a Painting III, 1962
Authors: Decq Louise , Saverwyns Steven , Kuvvetli Filiz , Baadsgaard Elizabeth 
Published: October 2024

This study investigates the preservation challenges associated with Ole Schwalbe's Portrait of a Painting III (1962). The painting, an example of minimalist abstract constructivism, suffers from severe paint delamination. Analytical techniques such as SEM-EDX, THM-GC/MS, micro-Raman spectroscopy and FTIR have been used to examine the paint composition and identify the causes of instability. The results suggest that incomplete curing processes and oxidative degradation in the thickly applied black paint has caused zinc soap accumulation in the underlying zinc white preparation layer. The volume reduction of the upper layers, combined with a swelling of the lower, has contributed to the degradation observed. This research provides insights into the conservation of post-war abstract artworks.
Lexicalization, polysemy and loanwords in anger: A comparison with non-affective domains in Middle English
Authors: Sylvester Louise , Tiddeman Megan 
Published: October 2024

This paper compares the Middle English lexis of anger with that of nine non-affective domains. We first investigate lexicalization, polysemy, replacement and retention, and then focus on semantic overlap between French / Latin loanwords in Middle English and their etyma. Results show that anger is more heavily lexicalized than other domains and individual lexemes within it are more polysemous. Turnover of vocabulary appears to be higher, but it was not the case that incoming loanwords caused existing native terms to shift or fall from use in large numbers. anger has similar proportions of loanword senses innovated in Middle English and they are much more likely to be figurative.
Évaluer les obstacles et les facilitateurs à la participation sociale en contextes scolaires et professionnels de jeunes atteints de mucoviscidose
Authors: Ferez Sylvain , Silvestri Laura , Issanchou Damien , Boucher Normand , Fougeyrollas Patrick 
Published: October 2024

Cet article s’intéresse aux enjeux méthodologiques de l’articulation de données recueillies par questionnaire et par entretien pour étudier les obstacles à la participation sociale en contextes scolaires et professionnels de jeunes (15-26 ans) vivant avec la mucoviscidose. En plus d’une enquête exploratoire auprès de treize professionnels, il s’appuie sur le croisement de données produites à partir d’une version courte et adaptée de la Mesure de la qualité de l’environnement-MQE (n=100) et d’entretiens de type “récit de vie et de pratiques” auprès de lycéens, d’étudiants, de jeunes en recherche d’emploi ou en emploi (n=29). Les résultats montrent l’écart entre les réponses à la MQE et les récits produits en entretiens. D’un côté, les réponses à la MQE éclairent l’impact des environnements physiques et de l’organisation spatiale et temporelle des milieux scolaires et professionnels sur l’expérience du handicap. De l’autre, elles semblent sous-estimer le poids des environnements humains dans la production ou la réduction des obstacles à la participation. Les témoignages recueillis en entretiens permettent de réévaluer l’importance de ces environnements. Le recours aux méthodes mixtes de recherche apparaît donc essentiel pour saisir le rôle respectif des composantes matérielles et humaines des environnements dans la production du handicap en contextes scolaires et professionnels.
Les freins de l’innovation inclusive
Authors: Peyrard Estelle 
Published: October 2024

Le handicap découle de l’interaction entre des caractéristiques individuelles et des caractéristiques environnementales (Fougeyrollas et al., 1998). Les produits et services proposées au consommateur en situation de handicap font partie de ces caractéristiques environnementales et jouent un rôle dans le processus de production du handicap. Pour que ces produits et services répondent mieux aux besoins et dans une logique d’empowerment, les consommateurs en situation de handicap peuvent participer à la conception de produits innovants. On parle de co-conception. Cette participation se heurte à un certain nombre de freins pratiques (Allen, McGrenere & Purves, 2007; Brulé, Bailly & Gentes, 2015; Magnier et al., 2012) et méthodologiques (Hendriks, Slegers & Duysburgh, 2015; Plos, 2011). Ces freins ont été étudiés essentiellement par handicap, fournissant des préconisations managériales censées être valables quel que soit le produit. Or l’observation de 38 cas de co-conception au TechLab d’APF France handicap montre qu’il n’en est rien: des produits différents apportent des défis différents en matière de co-conception et beaucoup ont peu à voir avec le handicap des personnes. Trois types de freins à la co-conception sont identifiés pour les phases de test des produits: des freins liés à l’installation du produit innovant, des freins organisationnels et des freins liés à l’impact des produits sur la vie des personnes. L’article propose des réponses pour contourner ces freins et maximiser la participation des CSH aux démarches d’innovation produit.