ASTRONOMISCHE NACHRICHTEN 由 H. C. SCHUMACHER 于 1821 年创立，是世界上仍在出版的最古老的天文学期刊。著名的天文发现和在天文学和天体物理学方面的重要论文发表在 300 多卷期刊上，出色地代表了过去 180 年来天文学研究的进展。今天，ASTRONOMICAL NOTES/ASTRONOMISCHE NACHRICHTEN 发表了关于观测和理论天体物理学领域以及太阳系和太阳物理学相关主题的文章。此外，还涵盖了有关天基和天基天文仪器的论文，以及有关数值天体物理技术和超级计算机建模的论文。论文可通过电子版短视频序列完成。 ASTRONOMICAL NOTES/ASTRONOMISCHE NACHRICHTEN 还出版会议记录的特刊。

Founded by H. C. Schumacher in 1821, "Astronomische Nachrichten" is the oldest astronomy journal still in publication today. It has published numerous significant astronomical discoveries and important papers in the fields of astronomy and astrophysics across more than 300 volumes, excellently representing the progress of astronomical research over the past 180 years. Today, "Astronomical Notes/Astronomische Nachrichten" publishes articles on observational and theoretical astrophysics, as well as topics related to the solar system and solar physics. Additionally, it covers papers on ground-based and space-based astronomical instruments, as well as research on numerical astrophysical techniques and supercomputer modeling. Papers can be presented through electronic short video sequences. "Astronomical Notes/Astronomische Nachrichten" also publishes special issues of conference proceedings.

《Astronomische Nachrichten》由H. C. Schumacher于1821年创立，是世界上仍在出版的最古老的天文学期刊。该期刊发表了许多著名的天文发现和在天文学及天体物理学领域的重要论文，涵盖了300多卷，出色地代表了过去180年来天文学研究的进展。如今，《Astronomical Notes/Astronomische Nachrichten》主要发表关于观测和理论天体物理学的文章，以及与太阳系和太阳物理学相关的主题。此外，期刊还包括有关天基和地基天文仪器的论文，以及数值天体物理技术和超级计算机建模的研究。论文可以通过电子版短视频序列进行展示。《Astronomical Notes/Astronomische Nachrichten》还出版会议记录的特刊。

Astronomische Nachrichten

ABSTRACT Vector U ‐bosons, often referred to as “dark photons,” are potential candidates for mediating dark matter interactions. In this study, we outline a procedure to derive theoretical constraints on the upper bound of the kinetic mixing parameter using dilepton data from heavy‐ion from SIS to RHIC energies. The analysis is based on the microscopic Parton–Hadron–String Dynamics (PHSD) transport model, which successfully reproduces the measured dilepton spectra in , , and collisions. Besides the dilepton channels resulting from interactions and decays of Standard Model particles (such as mesons and baryons), we extend the PHSD approach to include the decay of hypothetical U ‐bosons into dileptons, . The production of these U ‐bosons occurs via Dalitz decays of pions, η ‐mesons, ω ‐mesons, Delta resonances, as well as from the decays of vector mesons and mesons. This analysis provides an upper limit on and offers insights into the accuracy required for future experimental searches for dark photons through dilepton experiments.

Adrian William Romero Jorge

Elena Bratkovskaya

Taesoo Song

Laura Sagunski

Exploring Dark Photon Production and Kinetic Mixing Constraints in Heavy‐Ion Collisions

探索重离子碰撞中的暗光子产生与动力学混合约束

ABSTRACT For a deeper understanding of the physical processes at play in solar flares, it is necessary to analyze the flare emissions at multiple wavelengths. This multifrequency approach enables the characterization of energetic electrons accelerated from hundreds of keV and up to several tens of MeV. This study reports on the observation of 10 solar flares, in which the spectral parameters were determined for the cm/mm and x‐ray bands. The radio spectrum was fitted using gyrosynchrotron emission whereas the hard x‐rays fit considered a model of thermal plus nonthermal emission of accelerated electrons. The results show that the spectral indices of the energy distribution of nonthermal electrons emitting in millimeter and hard x‐rays do not agree, with the millimeter spectral index being approximately 2 units harder than that of hard x‐rays. These findings are consistent with previous research and suggest the existence of a break in the energy spectrum of accelerated electrons. Moreover, for the only flare where photons exceeding 1 MeV were detected, the hard x‐ray spectra exhibited a broken power‐law where the index of the electron distribution above ~500 keV agreed with the inferred radio spectral index.

Adriana Valio

Douglas F. da Silva

Hui Li

Particle Acceleration in Solar Flares From Radio and Hard X‐Ray Spectra

基于射电和硬X射线光谱的太阳耀斑粒子加速研究

ABSTRACT The ultra‐luminous x‐ray pulsar (ULXP) NGC 7793 P13 has been regularly monitored with XMM‐Newton , NuSTAR , and Swift for the last 8 years. Here, we present the latest results of this monitoring campaign with respect to the pulse period evolution and spectral variability. We find that since the source recovered from an x‐ray low state in 2020–2022 the spin‐up rate has increased significantly compared with before the off‐state, even though the x‐ray luminosity has not shown an equivalent increase. We find that the x‐ray and optical/UV flux are anti‐correlated, and speculate that this variability might be driven by a large accretion disk, precessing at a super‐orbital period of 7–8 years. We study the spectral behavior in the XMM‐Newton and NuSTAR data, and find very little changes in the spectral shape, despite the large flux variability. This spectral consistency provides further indication that the observed flux variability is a geometric effect and not due to intrinsic changes of the accretion rate.

Felix Fürst

Dominic J. Walton

Matteo Bachetti

Hannah Earnshaw

Murray Brightman

The Surprising Long‐Term Evolution of the <scp>ULXP NGC</scp> 7793 <scp>P13</scp>

令人惊讶的长期演化：<scp>ULXP NGC</scp> 7793 <scp>P13</scp>

ABSTRACT In the year 1924, a paper by Carl Wirtz appeared in ‘ Astronomische Nachrichten ’, entitled ‘De Sitter's cosmology and the radial motion of spiral galaxies’. This paper and its author remained largely unnoticed by the community, but it seems to be the first cosmological interpretation of the redshift of galaxies as a time dilation effect and the expansion of the Universe. Edwin Hubble knew Wirtz' publications quite well. The modern reader would find Wirtz' own understanding diffuse and contradictory in some aspects, but that reflected the early literature on nebulae, to which he himself made important contributions. The 100th anniversary provides a good opportunity to present an English transcription to the community, which can be found in the appendix. This anniversary also provokes to ask for the present status of cosmology which many authors see in a crisis. From an observational viewpoint, it shall be illustrated that until today there is no consistent/convincing understanding of how the Universe evolved.

Tom Richtler

Carl Wirtz' Article From 1924 in <i>Astronomische Nachrichten</i> on the Radial Motions of Spiral Nebulae

卡尔·维尔茨1924年在《天文学通讯》上发表的关于螺旋星云径向运动的文章

ABSTRACT Observations show that the x‐ray emission of the accreting weakly magnetized neutron stars (WMNSs) is polarized. In this article, we summarize the analytical models for the polarized emission of various components of the WMNSs. We introduce a missing theoretical model, where we assume the emission comes from the spreading layer, the extension of the boundary layer between the accretion disk and the neutron star. We show how these models and the results of the simulations provide new insights into the x‐ray polarization from weakly magnetized neutron stars observed with the imaging x‐ray polarimetry explorer (IXPE). We specifically focus on the most peculiar case of the X‐ray burster GX 13+1.

Abbreviation	Astron. Nachr.
Journal Impact	1.26
Quartiles(Global)	ASTRONOMY & ASTROPHYSICS(Q3)

ISSN	0004-6337, 1521-3994
h-index	61

Publication Information	Publisher: Wiley-VCH Verlag，Publishing cycle: Bimonthly，Journal Type: journal，Open Access Journals: No
Basic data	Year of publication: 1974，Proportion of original research papers: 97.26%，Self Citation Rate:9.10%， Gold OA Rate: 22.17%
Average review cycle	网友分享经验：偏慢,4-8周
Average recruitment ratio	网友分享经验：容易

Astronomische Nachrichten

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Exploring Dark Photon Production and Kinetic Mixing Constraints in Heavy‐Ion Collisions

Particle Acceleration in Solar Flares From Radio and Hard X‐Ray Spectra

The Surprising Long‐Term Evolution of the ULXP NGC 7793 P13

Carl Wirtz' Article From 1924 in Astronomische Nachrichten on the Radial Motions of Spiral Nebulae

Accretion Onto Weakly Magnetized Neutron Stars: Polarization Theory and Its Application to X‐Ray Burster GX 13+1

Carl Wirtz' Article From 1924 in Astronomische Nachrichten on the Radial Motions of Spiral Nebulae

Exploring Dark Photon Production and Kinetic Mixing Constraints in Heavy‐Ion Collisions

Particle Acceleration in Solar Flares From Radio and Hard X‐Ray Spectra

The Surprising Long‐Term Evolution of the ULXP NGC 7793 P13

Accretion Onto Weakly Magnetized Neutron Stars: Polarization Theory and Its Application to X‐Ray Burster GX 13+1