bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dust-evacuated Zones near Massive Stars: Consequences of Dust Dynamics on Star-forming Regions
Authors: Soliman Nadine H. , Hopkins Philip F. , Grudić Michael Y. 
Published: October 2024

Abstract
Stars form within dense cores composed of both gas and dust within molecular clouds. However, despite the crucial role that dust plays in the star formation process, its dynamics is frequently overlooked, with the common assumption being a constant, spatially uniform dust-to-gas ratio and grain size spectrum. In this study, we introduce a set of radiation-dust-magnetohydrodynamic simulations of star-forming molecular clouds from the STARFORGE project. These simulations expand upon the earlier radiation MHD models, which included cooling, individual star formation, and feedback. Notably, they explicitly address the dynamics of dust grains, considering radiation, drag, and Lorentz forces acting on a diverse size spectrum of live dust grains. We find that once stars exceed a certain mass threshold (∼2 M
⊙), their emitted radiation can evacuate dust grains from their vicinity, giving rise to a dust-suppressed zone of size ∼100 au. This removal of dust, which interacts with gas through cooling, chemistry, drag, and radiative transfer, alters the gas properties in the region. Commencing during the early accretion stages and preceding the main-sequence phase, this process results in a mass-dependent depletion in the accreted dust-to-gas (ADG) mass ratio within both the circumstellar disk and the star. We predict that massive stars (≳10 M
⊙) would exhibit ADG ratios that are approximately 1 order of magnitude lower than that of their parent clouds. Consequently, stars, their disks, and circumstellar environments would display notable deviations in the abundances of elements commonly associated with dust grains, such as carbon and oxygen.
JADES + JEMS: A Detailed Look at the Buildup of Central Stellar Cores and Suppression of Star Formation in Galaxies at Redshifts 3 < z < 4.5
Authors: Ji Zhiyuan , Williams Christina C. , Tacchella Sandro , Suess Katherine A. , Baker William M. , Alberts Stacey , Bunker Andrew J. , Johnson Benjamin D. , Robertson Brant , Sun Fengwu , Eisenstein Daniel J. , Rieke Marcia , Maseda Michael V. , Hainline Kevin , Hausen Ryan , Rieke George , Willmer Christopher N. A. , Egami Eiichi , Shivaei Irene , Carniani Stefano , Charlot Stephane , Chevallard Jacopo , Curtis-Lake Emma , Looser Tobias J. , Maiolino Roberto , Willott Chris , Chen Zuyi , Helton Jakob M. , Lyu Jianwei , Nelson Erica , Bhatawdekar Rachana , Boyett Kristan , Sandles Lester 
Published: October 2024

Abstract
We present a spatially resolved study of stellar populations in six galaxies with stellar masses M
* ∼ 1010
M
☉ at z ∼ 3.7 using 14-filter James Webb Space Telescope (JWST)/NIRCam imaging from the JADES and JEMS surveys. The six galaxies are visually selected to have clumpy substructures with distinct colors over rest frame 3600−4100 Å, including a red, dominant stellar core that is close to their stellar-light centroids. With 23-filter photometry from the Hubble Space Telescope to JWST, we measure the stellar-population properties of individual structural components via spectral energy distribution fitting using Prospector. We find that the central stellar cores are ≳2 times more massive than the Toomre mass, indicating they may not form via single in situ fragmentation. The stellar cores have stellar ages of 0.4−0.7 Gyr that are similar to the timescale of clump inward migration due to dynamical friction, suggesting that they likely instead formed through the coalescence of giant stellar clumps. While they have not yet quenched, the six galaxies are below the star-forming main sequence by 0.2−0.7 dex. Within each galaxy, we find that the specific star formation rate is lower in the central stellar core, and the stellar-mass surface density of the core is already similar to quenched galaxies of the same masses and redshifts. Meanwhile, the stellar ages of the cores are either comparable to or younger than the extended, smooth parts of the galaxies. Our findings are consistent with model predictions of the gas-rich compaction scenario for the buildup of galaxies’ central regions at high redshifts. We are likely witnessing the coeval formation of dense central cores, along with the onset of galaxy-wide quenching at z > 3.
Origin of the Very High Energy Gamma Rays in the Low-luminosity Active Galactic Nucleus NGC 4278
Authors: Lian Ji-Shun , Li Jia-Xuan , Hu Xin-Ke , Gan Ying-Ying , Wu Tan-Zheng , Zhang Hai-Ming , Zhang Jin 
Published: October 2024

Abstract
NGC 4278, a low-luminosity active galactic nucleus, is generally classified as a low-ionization nuclear emission-line region (LINER). Recently, it has been reported to be associated with a very high energy γ-ray source 1LHAASO J1219+2915 in the first Large High Altitude Air Shower Observatory source catalog. However, no associated counterpart has been detected by analyzing the data collected by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope. By analyzing its X-ray observation data from Swift-XRT, we find that NGC 4278 is in a high-flux state on MJD 59546, with the X-ray flux more than one order of magnitude higher than that observed ∼11.7 yr earlier by Chandra. Interestingly, this Swift-XRT observation was conducted during the active phase of the γ-ray source 1LHAASO J1219+2915. We propose that the detection of very high energy γ-rays from NGC 4278 may be attributed to the presence of an active nucleus in its center. To reproduce the spectral energy distribution (SED) of NGC 4278, we employ a one-zone leptonic model, typically used for fitting broadband SEDs of BL Lacs, and find that a smaller magnetic field strength is required than that of typical TeV BL Lacs. Furthermore, NGC 4278 exhibits significantly lower luminosity in both radio and TeV bands when compared with typical TeV BL Lacs. In the radio luminosity versus Eddington ratio plane, NGC 4278 shows greater similarity to Seyfert galaxies and LINERs than to BL Lacs; however, it still roughly follows the extension toward lower luminosity seen in BL Lacs.
The Progenitor and Central Engine of Short-duration GRB 201006A Associated with a Coherent Radio Flash
Authors: Tian Xiao , Lü HouJun , Yuan Yong , Yang Xing , Yuan HaoYu , Yi ShuangXi , Zhang WenLong , Liang EnWei 
Published: October 2024

Abstract
Recently, the detection of a coherent radio flash associated with short-duration GRB 201006A, occurring 76.6 minutes after the burst, has attracted great attention. However, the physical origin of the coherent radio flash remains under debate. By reanalyzing its data observed by Fermi and Swift, we find that an early radio afterglow as the physical origin of the radio flash can be ruled out, but the coherent radio emission seems to be consistent with the hypothesis of a supramassive magnetar as the central engine collapsing into a black hole. Within this scenario, the derived magnetar surface magnetic field (B

p
) and the initial spin period (P
0) fall into a reasonable range but require a preferably low value of η
R = 10−7 or 10−6. Moreover, the calculated low-ε value and E

γ,iso–E

p
correlation of GRB 201006A also supports the progenitor which is from the merger of compact stars. We also discuss the non-detected kilonova emission associated with GRB 201006A, and then compare with its upper limits of optical observations.
The Photometric Study of EX Dra: A Dwarf Nova Exhibiting a Titled and Precessional Disk
Authors: Liu Wei , Qian Sheng-Bang , Shi Xiang-Dong , Sun Qi-Bin , Fang Xiao-Hui , Wang Qi-Shan 
Published: October 2024

Abstract
We present a photometric study of EX Dra, a dwarf nova that has been extensively observed by the Transiting Exoplanet Survey Satellite. The data reveal the occurrence of 20 complete outbursts, exhibiting several intriguing and rare characteristics. The light curves exhibit a distinct superorbital signal with a period of approximately P
sor ∼ 4.39(7) days, along with a negative superhump showing an approximate period of P
nsh ∼ 4.805(1) hr, indicating that the accretion disk is tilted and undergoing precession with the period of P
sor. In addition, the time-varying nature of P
sor suggests that the precession period is fluctuating.The eclipsing light minima O – C analysis during quiescence shows an oscillation with period of 3.9(5) days, which is a little shorter than the superorbital period. We contend that this is unlikely to be a sudden alteration of the orbital period, but rather, it is influenced by the tilt and precession of the accretion disk. Notably, we found an amplitude shift in the outburst behavior from 3.5 mag with a periodicity of about 26 days to an amplitude of around 2.5 mag with a periodicity of about 12 days, which persisted for 14 yr before reverting. Furthermore, we have extracted quasiperiodic oscillations in the plateau at the noneclipsed phases, characterized by periods ranging between 37 and 40 minutes.
Formation of the Interstellar Sugar Precursor, (Z)-1,2-Ethenediol, through Radical Reactions on Dust Grains
Authors: del Valle Juan Carlos , Redondo Pilar , Kästner Johannes , Molpeceres Germán 
Published: October 2024

Abstract
In recent years, the continued detection of complex organic molecules of prebiotic interest has refueled the interest in a panspermic origin of life. The prebiotic molecule glyceraldehyde is proposed to be formed from (Z)-1,2-ethenediol, a molecule recently detected toward the G+0.693-0.027 molecular cloud at the galactic center. In this work, we computationally simulate the formation of (Z)-1,2-ethenediol from vinyl alcohol on the surface of amorphous solid water in a two-step synthesis involving an OH addition and an H abstraction reaction. In total, we considered all reaction possibilities of the 1,1- and 1,2-OH addition to vinyl alcohol followed by H abstraction or H addition reactions on the resulting radicals. The combination of these reactions is capable of explaining the formation of (Z)-1,2-ethenediol provided a suprathermal diffusion of OH. We also conclude that our proposed formation pathway is not selective and also yields other abstraction and addition products. Key in our findings is the connection between the adsorption modes of the reactants and intermediates and the stereoselectivity of the reactions.
An Estimate of the Impact of Reionization on Supermassive Black Hole Growth
Authors: Upton Sanderbeck Phoebe R. , Johnson Jarrett L. , Marshall Madeline A. 
Published: October 2024

Abstract
The supermassive black holes (SMBHs) that power active galactic nuclei found at z ≥ 6 were formed during the Epoch of Reionization. Because reionization is an inhomogeneous process, the physical properties of SMBH host-galaxy environments will vary spatially during reionization. We construct a semi-analytic model to estimate the impact of reionization on SMBH growth. Using a series of merger trees, reionization models, and black hole (BH) growth models, we find that early reionization can reduce a SMBH’s mass by up to [50, 70, 90]% within dark matter halos of mass [1012, 1011, 1010] M
⊙ by z = 6. Our findings also suggest that the redshift range in which BH growth is impacted by reionization strongly depends on whether the Eddington accretion rate can be exceeded. If so, we find that BH masses are significantly suppressed principally during the early phases of reionization (z ≳ 10), while they are more readily suppressed across the full redshift range if super-Eddington growth is not allowed. We find that the global average impact of reionization may be to reduce the masses of BHs residing in ≲1011
M
⊙ halos by a factor of ≳2. The census of SMBHs being uncovered by the JWST may offer a means to test the basic prediction that more massive BHs reside in cosmological volumes that are reionized at later times.
Percolation Statistics in the MillenniumTNG Simulations
Authors: Regős Enikő , Springel Volker , Bose Sownak , Hadzhiyska Boryana , Hernández-Aguayo César 
Published: October 2024

Abstract
The statistical analysis of cosmic large-scale structure is most often based on simple two-point summary statistics, like the power spectrum or the two-point correlation function of a sample of galaxies or other types of tracers. In contrast, topological measures of clustering are also sensitive to higher-order correlations and thus offer the prospect to access additional information that may harbor important constraining power. We here revisit one such geometric measure of the cosmic web in the form of the so-called percolation analysis, using the recent MillenniumTNG simulation suite of the ΛCDM paradigm. We analyze continuum percolation statistics both for high-resolution dark matter particle distributions and for galaxy mock catalogs from a semianalytic galaxy formation model within a periodic simulation volume of 3000 Mpc on a side. For comparison, we also investigate the percolation statistics of random particle sets and neutrino distributions with two different summed particle masses. We find that the percolation statistics of the dark matter distribution evolves strongly with redshift and thus clustering strength, yielding a progressively lower percolation threshold toward later times. However, there is a sizable residual dependence on numerical resolution, which we interpret as a residual influence of different levels of shot noise. This is corroborated by our analysis of galaxy mock catalogs, whose results depend on sampling density more strongly than on galaxy selection criteria. While this limits the discriminative power of percolation statistics, our results suggest that it still remains useful as a complementary cosmological test when controlled for sampling density.
Lyman Continuum Leakers at z > 3 in the GOODS-S Field: Starburst or Not?
Authors: Zhu 朱 Shuairu 帅儒 , Yuan Fang-Ting , Jiang Chunyan , Zheng Zhen-Ya , Lin Ruqiu 
Published: October 2024

Abstract
We investigate the star-forming properties of 23 Lyman continuum (LyC) leakers at z > 3 in the Great Observatories Origins Deep Survey-South field based on a systematic review of LyC observations from the literature. Using data from the Hubble Space Telescope and the James Webb Space Telescope, we construct the spectral energy distributions for these LyC leakers, covering the spectrum from rest-frame ultraviolet to near-infrared. Through the application of a unified modeling approach, we measure the ultraviolet slope (β), star formation rate, and stellar mass for these LyC leakers in a consistent manner. These high-redshift LyC leakers demonstrate statistically blue UV-continuum slopes (β), which is consistent with their high escape fraction of LyC photons. We find that these high-redshift LyC leakers span a wide range of specific star formation rate (

log
(
sSFR

/yr) from −8.6 to −6.7). Ten of these LyC leakers are located on the star formation main sequence, instead of all being in the starburst mode. The results indicate that intense bursts of star formation are not necessarily required for the leakage of LyC photons for galaxies at z > 3.
Mitigating the Binary Viewing Angle Bias for Standard Sirens
Authors: Salvarese Alberto , Chen Hsin-Yu 
Published: October 2024

Abstract
The inconsistency between experiments in the measurements of the local Universe expansion rate, the Hubble constant, suggests unknown systematics in the existing experiments or new physics. Gravitational-wave standard sirens, a method to independently provide direct measurements of the Hubble constant, have the potential to address this tension. Before that, it is critical to ensure there are no substantial systematics in the standard siren method. A significant systematic has been identified when the viewing angle of the gravitational-wave sources, the compact binary coalescences, was inferred inaccurately from electromagnetic observations of the sources. Such a systematic has led to a more than 10% discrepancy in the standard siren Hubble constant measurements with the observations of binary neutron star merger, GW170817. In this Letter, we develop a new formalism to infer and mitigate this systematic. We demonstrate that the systematic uncertainty of the Hubble constant measurements can be reduced to a level smaller than their statistical uncertainty with 5, 10, and 20 binary neutron star merger observations. We show that our formalism successfully reduces the systematics even if the shape of the biased viewing angle distribution does not follow precisely the model we choose. Our formalism ensures unbiased standard siren Hubble constant measurements when the binary viewing angles are inferred from electromagnetic observations.
Petrocultures in the making: Oil in 1920s Scandinavian newspapers
Authors: Furuseth Sissel 
Published: October 2024

Partant de l’hypothèse que la presse périodique a joué un rôle crucial dans la synchronisation du monde et la préparation de la transition énergétique mondiale au début du XXe siècle, l’article propose une historiographie du pétrole qui reconnaît la capacité excédentaire des journaux en tant que matériel de recherche et tire parti des approches analytiques développées dans le cadre des études sur la culture de l’imprimé. Empiriquement, l’article apporte de nouvelles connaissances sur la manière dont la pétroculture américaine a été négociée en Scandinavie dans l’entre-deux-guerres, en utilisant comme point de départ la réception critique par la presse du roman d’Upton Sinclair, Oil ! en Suède et en Norvège. Des archives de journaux de plus en plus accessibles montrent que le pétrole a dominé la culture écrite des années 1920 à un point tel que les hypothèses de base des études contemporaines sur la pétroculture concernant l’invisibilité du pétrole doivent être réexaminées.
Historia del Huérfano: un ejemplo de prosa de ficción en los virreinatos americanos
Authors: Aracil Varón Beatriz 
Published: October 2024

Superado hasta cierto punto el debate crítico en torno a la existencia o no del género novelesco en la América virreinal, en las últimas décadas hemos asistido sobre todo a la edición y análisis de un corpus heterogéneo de textos de este período que podemos definir como «prosa de ficción». Uno de esos textos es Historia del Huérfano, manuscrito preparado para la imprenta en 1621 que quedó inédito entonces y ha sido publicado por primera vez en 2017. El presente trabajo pretende contribuir a una caracterización de la prosa de ficción producida en los virreinatos americanos a partir del análisis de ciertos rasgos presentes en este curioso libro de fray Martín de León ubicables asimismo en otras obras (virreinales y peninsulares) de la época, como la continua interrelación entre realidad y ficción o el entrecruzamiento de géneros, que otorga al texto un carácter híbrido.
Petronio como excusa: una carta (inédita) de Juan de Fonseca y Figueroa a José Antonio González de Salas
Authors: González-Barrera Julián 
Published: October 2024

Uno de los pocos escritos autógrafos de Juan de Fonseca (1585-1627?) que se conservan es una carta latina enviada a José Antonio González de Salas (1592–1651) para discutir un pasaje del Satiricón de Petronio. A pesar de ser un texto conocido, no se había traducido hasta la fecha por la dificultad de su caligrafía y la oscuridad de su prosa latina. La traducción completa desvela importantes datos sobre la relación personal entre ambos humanistas.
L’ensemble monumental du Pâtis à Vieillevigne (Loire-Atlantique) : un nouvel exemple de complexe sur cour laténien en Gaule
Authors: Dufay-Garel Yann , Grall Marie , Paradis-Grenouillet Sandrine , Wassong Rémy 
Published: October 2024

Une fouille préventive menée en 2020 en préalable à un projet d’extension de carrière à Vieillevigne (Loire-Atlantique) a permis d’étudier la presque totalité d’un ensemble monumental gaulois. Celui-ci est constitué d’un enclos carré de 83 m de côté, à l’intérieur duquel un vaste bâtiment sur cour avec galeries périphériques a été identifié. Cette découverte remarquable s’insère dans une série restreinte d’ensembles sur cour similaires mis au jour en Gaule depuis une trentaine d’années. L’indigence du mobilier et la méconnaissance de l’environnement immédiat du complexe empêchent de s’avancer sur les activités qui y étaient pratiquées. Il constitue cependant un exemple rare d’architecture publique laténienne, du moins à usage collectif ou communautaire. Après une réoccupation de nature indéterminée au ier s. apr. J.-C., une voie est implantée probablement vers la fin de ce siècle. Son débouché pourrait être un sanctuaire antique, succédant à une occupation laténienne, identifié à quelques dizaines de mètres à l’ouest de l’emprise de fouille.
Mise en place des tourbières alcalines et modifications de la dynamique fluviatile dans la moyenne vallée de la Somme (France) à l’Holocène
Authors: Garcia Chloé , Antoine Pierre , Ducrocq Thierry , Bacon Jérémy , Beaumont Léa , Coutard Sylvie , Dabkowski Julie , Brasseur Boris 
Published: October 2024

La particularité des séquences holocènes des fonds de vallées du bassin de la Somme réside dans la présence d’épaisses formations tourbeuses (jusqu’à 10 m). Les grandes lignes de l’évolution de ces fonds de vallées ont été reconstituées lors d’un programme d’étude systématique des séquences sédimentaires de la Somme dans les années 1990 parallèlement aux fouilles archéologiques liées à la découverte de nombreux sites mésolithiques. Cependant, peu de datations au radiocarbone avaient été effectuées et aucun transect stratigraphique complet de la vallée de la Somme à l’aval d’Amiens n’avait été réalisé. Par ailleurs, le secteur de la moyenne vallée (≈1 km de large) dont l’étude moderne ne fait que commencer est caractérisé par la présence d’un épais massif de tufs calcaire (>6 m) sinueux et dominant de quelques mètres le fond de la vallée actuel. La reprise des recherches a pour ambition d’intégrer les données stratigraphiques existantes, notamment sur la vallée d’Acon (affluent), dans une nouvelle étude stratigraphique et paléoenvironnementale à l’échelle de la vallée, et de fournir un cadre géochronologique (datations radiocarbone) et des analyses physico-chimiques des principaux faciès. D’après ces nouveaux travaux, deux phases de développement de la tourbe ont été identifiées : à l’Allerød puis du début de l’Holocène ancien à la seconde moitié de l’Holocène moyen. Deux périodes d’incision sont aussi datées : à Holocène ancien (~ 11,7 ka cal BP) et moyen (~ 6,6 ka cal BP), la deuxième ayant entraîné la mise en place du tuf calcaire dans un petit chenal méandriforme. Contrairement à ce qui a été observé en haute vallée, l’absence de sédimentation tourbeuse post-Holocène moyen associée à la forte proéminence du tuf calcaire chenalisé pourrait résulter du rabattement de la nappe d’eau, de la dégradation de la tourbe depuis la dernière incision et des activités humaines.
Lakṣacaitya paubhās. Pictorial representations of a Newar Buddhist ritual performance
Authors: Namgyal-Lama Kunsang 
Published: October 2024

This article deals with a ritual called “Lakṣacaitya” (literally “hundred thousand caityas”) performed by Newar Buddhists of the Kathmandu Valley in Nepal, during which a very large number of miniature caityas or stupas are made. Besides the interest of the ritual procedures as part of annual or occasional religious observances (Skt. vrata), the performance of the Lakṣacaitya ritual has been, for some devotees, the occasion to commission a scroll painting on cotton cloth (New. paubhā) commemorating its completion. In the Nepalese world, few religious practices have been the subject of such depictions. These paintings not only attest to the antiquity of this Buddhist practice in Nepal, but also constitute unique visual materials, especially regarding the paubhās of the 18th and 19th centuries, of which there is no equivalent in Indian or Tibetan Buddhist art.