Astronomische Nachrichten最新文献

{"title":"Discovering Periodic and Repeating Nuclear Transients in the XMM-Newton Archives","authors":"Natalie A. Webb,&nbsp;Vincent Foustoul,&nbsp;Robbie Webbe,&nbsp;Matteo Bachetti,&nbsp;Erwan Quintin,&nbsp;Laurent Michel","doi":"10.1002/asna.70102","DOIUrl":"https://doi.org/10.1002/asna.70102","url":null,"abstract":"<div>\u0000 \u0000 <p>The regions around massive black holes can show x-ray variability on timescales from seconds to decades. Observing many black holes over different timescales can enhance our chances of detecting variability coming from (partial) tidal disruption events, massive black hole binaries, changing state AGN, blazar activity and much more. X-ray catalogues with hundreds of thousands of detections are treasure troves of such sources, which require innovative methods to identify these black holes. We present the current XMM-Newton catalogues available and describe several examples of tidal disruption events (TDEs) and quasi-periodic eruption sources that have been found whilst mining this data. We describe preliminary work on a search for periodic variables in the XMM-Newton EPIC archival data, with the example of finding new massive black hole binaries. We also describe the STONKS pipeline that is now in the XMM-Newton automatic reduction pipeline and the near real-time alert system that allows the follow-up of new and fading transients. We provide examples of fading sources that are newly identified candidate TDEs.</p>\u0000 </div>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"347 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148268910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Issue Information: Astron. Nachr. 05/2026","authors":"","doi":"10.1002/asna.70106","DOIUrl":"https://doi.org/10.1002/asna.70106","url":null,"abstract":"","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"347 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.70106","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148268947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Repeating Nuclear Transients From Repeating Partial Tidal Disruption Events","authors":"Ananya Bandopadhyay,&nbsp;Eric R. Coughlin,&nbsp;Julia Fancher,&nbsp;C. J. Nixon,&nbsp;Dheeraj R. Pasham","doi":"10.1002/asna.70083","DOIUrl":"https://doi.org/10.1002/asna.70083","url":null,"abstract":"<p>Extragalactic nuclear transients that exhibit repeating outbursts can be modeled as the repeated dynamical interaction between bound stars and supermassive black holes (SMBHs). A subset of these transients, with recurrence timescales of months-to-years, have been explained as accretion flares from the repeated tidal stripping of a star by an SMBH, in a repeating partial tidal disruption event (rpTDE). We outline the scope of the rpTDE model and discuss hydrodynamical simulations and analytical predictions for the stability of stars undergoing repeated mass loss, and the long-term evolution of these flares as a function of stellar type and orbital parameters. Our findings demonstrate that high-mass and centrally concentrated stars undergo negligible changes in structure in response to small amounts (<span></span><math>\u0000 <mrow>\u0000 <mo>˜</mo>\u0000 <mn>1</mn>\u0000 <mo>%</mo>\u0000 <mo>−</mo>\u0000 <mn>10</mn>\u0000 <mo>%</mo>\u0000 <msub>\u0000 <mi>M</mi>\u0000 <mo>⋆</mo>\u0000 </msub>\u0000 </mrow></math>) of mass loss, and can survive many mass-stripping encounters with an SMBH. Contrarily, low-mass and less evolved stars are unstable to mass loss, and would be destroyed within a few orbits. We discuss the implications of these results for constraining the stellar type and orbital parameters of observed sources, such as ASASSN-14ko, for which <span></span><math>\u0000 <mrow>\u0000 <mo>≳</mo>\u0000 <mn>20</mn>\u0000 </mrow></math> flares have been observed, and AT2020vdq, which exhibits a second flare that is brighter than its primary outburst.</p>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"347 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.70083","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148268797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optical and cm Follow-Ups of the Changing-Look Event in Mkn 590","authors":"Biswaraj Palit,&nbsp;Abhijeet Borkar,&nbsp;Agata Różańska,&nbsp;Alex Markowitz,&nbsp;Marzena Śniegowska,&nbsp;Swayamtrupta Panda,&nbsp;David Homan,&nbsp;Krystian Iłkiewicz","doi":"10.1002/asna.70098","DOIUrl":"https://doi.org/10.1002/asna.70098","url":null,"abstract":"<div>\u0000 \u0000 <p>The Changing-Look active galactic nucleus Mkn 590 is currently in a rejuvenated state, exhibiting a contemporaneous flux rise across X-rays, UV, optical and cm wavelengths. In this study, we present three new optical spectra obtained with the Nordic Optical Telescope, alongside three 1.4 GHz continuum measurements from the Giant Meterwave Radio Telescope, acquired since Nov. 2024. We identified a clear increase in the broad hydrogen Balmer line emission in the most recent observational epochs. Additionally, the core radio flux densities appear to track the overall X-ray variability, suggesting a possible connection between the accretion flow and jet activity. Based on these data, we aim to explore the evolution of the circumnuclear gas in this source and potential links between accretion and ejection activity.</p>\u0000 </div>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"347 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148269146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Needle in a Poissonian Haystack—An X-Ray Astronomer's Guide to QPE Fishing","authors":"Erwan Quintin,&nbsp;Norman Khan,&nbsp;Natalie A. Webb,&nbsp;Robbie Webbe,&nbsp;Richard D. Saxton,&nbsp;Giovanni Miniutti,&nbsp;Margherita Giustini","doi":"10.1002/asna.70088","DOIUrl":"https://doi.org/10.1002/asna.70088","url":null,"abstract":"<div>\u0000 \u0000 <p>After 6 years of studies following the discovery of GSN069, a link is starting to appear between the elusive Quasi-Periodic Eruptions (QPEs) and other types of nuclear transients, among which are Tidal Disruption Events (TDEs). As such, observing strategies are adapting, with a current trend focusing on late-time x-ray follow-ups of (optical) TDEs. While these campaigns are so far proving quite successful, the inherent confirmation bias they introduce in our sample could lead the community to hasty, and perhaps erroneous, conclusions. It is thus important to still pursue the search for nuclear transients in other, more agnostic directions. In this work, we focus on the observational aspects of our field, and lay out two different methods that can be deployed in order to reveal new QPE sources. These complementary methods enable the detection of long-term (<span></span><math>\u0000 <mrow>\u0000 <mo>∼</mo>\u0000 </mrow></math>years) and short term (<span></span><math>\u0000 <mrow>\u0000 <mo>∼</mo>\u0000 </mrow></math>minutes) transient events, that would have otherwise been missed by the standard detection pipelines. Both of these methods can be used either for data mining in the 25 years worth of XMM-Newton archive, or to trigger real-time follow-ups upon a more recent discovery.</p>\u0000 </div>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"347 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148268990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cover Picture: Astron. Nachr. 05/2026","authors":"","doi":"10.1002/asna.70105","DOIUrl":"https://doi.org/10.1002/asna.70105","url":null,"abstract":"<p>Conference poster (Credit: Ignacio de la Calle)\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"347 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.70105","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148268946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quantifying the Impact of Relativistic Precession on Tidal Disruption Event Light Curves","authors":"Diego Calderón,&nbsp;Ondřej Pejcha,&nbsp;Brian D. Metzger,&nbsp;Paul C. Duffell,&nbsp;Stephan Rosswog","doi":"10.1002/asna.70092","DOIUrl":"https://doi.org/10.1002/asna.70092","url":null,"abstract":"<p>The tidal field of a black hole can turn a star into a gas stream whose orbit can precess, especially if the a black hole is rapidly spinning. In this work, we investigate the impact of precession on the light curves of tidal disruption events (TDE). To do so, we perform two-dimensional radiation-hydrodynamic simulations of the interaction of the TDE wind and luminosity with the precessed stream wrapped around the black hole. Our results show that in events with black holes of <span></span><math>\u0000 <mrow>\u0000 <mo>∼</mo>\u0000 <msup>\u0000 <mn>10</mn>\u0000 <mn>6</mn>\u0000 </msup>\u0000 <mspace></mspace>\u0000 <msub>\u0000 <mi>M</mi>\u0000 <mo>⊙</mo>\u0000 </msub>\u0000 </mrow></math> and no orbit-spin inclination, the line of sight has little effect on the light curves, since the stream covers a small fraction of the solid angle as the precession is confined to the orbital plane. In the case of black holes of <span></span><math>\u0000 <mrow>\u0000 <mo>≳</mo>\u0000 <msup>\u0000 <mn>10</mn>\u0000 <mn>7</mn>\u0000 </msup>\u0000 <mspace></mspace>\u0000 <msub>\u0000 <mi>M</mi>\u0000 <mo>⊙</mo>\u0000 </msub>\u0000 </mrow></math> and high inclination (<span></span><math>\u0000 <mrow>\u0000 <mi>i</mi>\u0000 <mo>∼</mo>\u0000 <mn>90</mn>\u0000 <mo>°</mo>\u0000 </mrow></math>), the light curve peaks can be delayed by ∼100 days due to presence of the precessed stream blocking the radiation in the early phase of the event. We also discuss our efforts to model self-consistently the hydrodynamic evolution of a tidal stellar stream on curved spacetimes by the presence of a massive black hole.</p>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"347 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.70092","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148269191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preface to Excerpts From the 2025 ESAC Conference on X-Ray Quasi-Periodic Eruptions and Repeating Nuclear Transients","authors":"Richard Saxton,&nbsp;Giovanni Miniutti,&nbsp;Margherita Giustini,&nbsp;Erwan Quintin","doi":"10.1002/asna.70101","DOIUrl":"https://doi.org/10.1002/asna.70101","url":null,"abstract":"<div>\u0000 \u0000 <p>A series of extreme-variability phenomena associated with supermassive black holes (SMBHs) in galactic nuclei are being revealed with increasing frequency in recent years thanks to enhanced survey capabilities across the electromagnetic spectrum. The observation of these extreme phenomena has opened the way to the study of the physics of SMBHs in real time—something that, until a decade ago, was exclusively associated with stellar-mass black holes. A conference to discuss the physical processes powering these objects was held at ESAC, Madrid, Spain in June 2025.</p>\u0000 </div>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"347 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148269145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hidden No More: Spotlight on Tidal Disruption Events in Active Galactic Nuclei","authors":"Patrik Milán Veres","doi":"10.1002/asna.70095","DOIUrl":"https://doi.org/10.1002/asna.70095","url":null,"abstract":"<p>Tidal disruption events (TDEs) are typically discovered in previously quiescent galaxies. However, earlier studies have revealed a handful of TDEs occurring in pre-existing active galactic nuclei (AGN). We discuss AT2019aalc, a promising TDE candidate in an AGN, and compare it to similar sources. We also explore Bowen fluorescence flares, a newly identified class of flaring supermassive black holes, as potential members of the TDE in AGN transient class. We aim to connect the observed properties of these flares with the expectations of TDE-in-AGN simulations.</p>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"347 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.70095","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148269158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"347 4","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148077781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}