Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII

The Imaging X-ray Polarimetry Explorer (IXPE) 成像x射线偏振探测器(IXPE)

Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019) Pub Date : 2020-11-23 DOI: 10.22323/1.362.0068

R. Ferrazzoli

引用次数: 4

Concluding Remarks - II 结束语- II

Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019) Pub Date : 2020-11-23 DOI: 10.22323/1.362.0078

P. Padovani

引用次数: 0

Gamma-ray binaries 伽马射线的二进制文件

Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019) Pub Date : 2020-06-05 DOI: 10.22323/1.362.0045

M. Chernyakova, D. Malyshev

引用次数: 4

MAGIC Highlights 神奇的亮点

Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019) Pub Date : 2020-03-08 DOI: 10.22323/1.362.0043

J. Paredes, Magic Collaboration

引用次数: 2

Multi-messenger signals from short gamma ray bursts 来自短伽马射线暴的多信使信号

Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019) Pub Date : 2019-11-13 DOI: 10.22323/1.362.0059

A. Janiuk, K. Sapountzis, B. James, M. Kološ

{"title":"Multi-messenger signals from short gamma ray bursts","authors":"A. Janiuk, K. Sapountzis, B. James, M. Kološ","doi":"10.22323/1.362.0059","DOIUrl":"https://doi.org/10.22323/1.362.0059","url":null,"abstract":"We present the results of simulations done with the code HARM-COOL developed in the CTP PAS Warsaw research group over the years 2017-2019. It is based in the original GR MHD scheme proposed by Gammie et al. (2003) for the simulation of Active Galactic Nucleus, but now it has been suited for the engine of a short Gamma Ray Burst event. \u0000We compute time-dependent evolution of a black hole accretion disk, in two-dimensional, axisymmetric scheme. The code includes neutrino cooling and accounts for nuclear structure of dense, degenerate matter. Free protons, neutrons, and electron-positron pairs form a neutron-rich, magnetically driven outflow that provides site for subsequent r-process nucleosynthesis. \u0000Here the heavy elements up to the Uranium and Gold are synthesized and may contribute to the chemical enrichment of the circum-burst medium. Their radio-active decay will give signal in lower energies in a timescale of weeks-months after the GRB prompt phase. \u0000In addition, the magnetic fields are responsible for the launching of ultra-relativistic jets along the rotation axis of the central black hole, according to the well-known Blandford-Znajek mechanism. These jets are sites of variable high energy emission in gamma rays. We find that the magnetic field and the black hole spin account for the observed variability timescales and jet energetics.","PeriodicalId":265862,"journal":{"name":"Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129859794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Instabilities in modified theories of gravity 修正引力理论的不稳定性

Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019) Pub Date : 2019-11-07 DOI: 10.22323/1.362.0026

E. Arbuzova

引用次数: 2

Massive Primordial Black Holes 巨大的原始黑洞

Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019) Pub Date : 2019-11-06 DOI: 10.22323/1.362.0013

A. Dolgov

引用次数: 5

Super-Massive Neutron Stars and Compact Binary Millisecond Pulsars 超大质量中子星和紧凑型双毫秒脉冲星

Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019) Pub Date : 2019-10-21 DOI: 10.22323/1.362.0023

M. Linares

{"title":"Super-Massive Neutron Stars and Compact Binary Millisecond Pulsars","authors":"M. Linares","doi":"10.22323/1.362.0023","DOIUrl":"https://doi.org/10.22323/1.362.0023","url":null,"abstract":"The maximum mass of a neutron star has important implications across multiple research fields, including astrophysics, nuclear physics and gravitational wave astronomy. Compact binary millisecond pulsars (with orbital periods shorter than about a day) are a rapidly-growing pulsar population, and provide a good opportunity to search for the most massive neutron stars. Applying a new method to measure the velocity of both sides of the companion star, we previously found that the compact binary millisecond pulsar PSR J2215+5135 hosts one of the most massive neutron stars known to date, with a mass of 2.27$pm$0.16 M$_odot$ (Linares, Shahbaz & Casares, 2018). We reexamine the properties of the 0.33 M$_odot$ companion star, heated by the pulsar, and argue that irradiation in this \"redback\" binary is extreme yet stable, symmetric and not necessarily produced by an extended source. We also review the neutron star mass distribution in light of this and more recent discoveries. We compile a list of all (nine) systems with published evidence for super-massive neutron stars, with masses above 2 M$_odot$. We find that four of them are compact binary millisecond pulsars (one black widow, two redbacks and one redback candidate). This shows that compact binary millisecond pulsars are key to constraining the maximum mass of a neutron star.","PeriodicalId":265862,"journal":{"name":"Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129974420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Quasars from LSST as dark energy tracers: first steps 来自LSST的类星体作为暗能量示踪剂:第一步

Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019) Pub Date : 2019-10-07 DOI: 10.22323/1.362.0010

M. L. Mart'inez-Aldama, S. Panda, B. Czerny, M. Zajavcek

{"title":"Quasars from LSST as dark energy tracers: first steps","authors":"M. L. Mart'inez-Aldama, S. Panda, B. Czerny, M. Zajavcek","doi":"10.22323/1.362.0010","DOIUrl":"https://doi.org/10.22323/1.362.0010","url":null,"abstract":"In the near future, new surveys promise a significant increase in the number of quasars (QSO) at large redshifts. This will help to constrain the dark energy models using quasars. The Large Synoptic Survey Telescope (LSST) will cover over 10 million QSO in six photometric bands during its 10-year run. QSO will be monitored and subsequently analyzed using the photometric reverberation mapping (RM) technique. In low-redshift quasars, the combination of reverberation-mapped and spectroscopic results have provided important progress. However, there are still some facts which have to be taken into account for future results. It has been found that super-Eddington sources show time delays shorter than the expected from the well-known Radius-Luminosity ($Rmathrm{_{Hbeta}}-L_{5100}$) relation. Using a sample of 117 H$beta$ reverberation-mapped AGN with $0.02<z<0.9$, we propose a correction by the accretion rate effect recovering the classical $Rmathrm{_{Hbeta}}-L_{5100}$ relation. We determined the cosmological constants, which are in agreement with $Lambda$-Cold Dark Matter model within 2$sigma$ confidence level, which is still not suitable for testing possible departures from the standard model. Upcoming LSST data will decrease the uncertainties in the dark energy determination using reverberation-mapped sources, particularly at high redshifts. We show the first steps in the modeling of the expected light curves for H$beta$ and MgII.","PeriodicalId":265862,"journal":{"name":"Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133138966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Observations of the 86 GHz SiO maser sources in the Central Parsec of the Galactic Centre 银河系中心中央秒差距86 GHz SiO脉泽源的观测

Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019) Pub Date : 2019-09-30 DOI: 10.22323/1.362.0033

A. Borkar, A. Eckart, C. Straubmeier, N. Sabha, Laurant O. Sjouwerman, V. Karas, D. Kunneriath, L. Moser, S. Britzen, M. Valencia-Schneider, A. Donea, A. Zensus

{"title":"Observations of the 86 GHz SiO maser sources in the Central Parsec of the Galactic Centre","authors":"A. Borkar, A. Eckart, C. Straubmeier, N. Sabha, Laurant O. Sjouwerman, V. Karas, D. Kunneriath, L. Moser, S. Britzen, M. Valencia-Schneider, A. Donea, A. Zensus","doi":"10.22323/1.362.0033","DOIUrl":"https://doi.org/10.22323/1.362.0033","url":null,"abstract":"We present results of 3 mm observations of SiO maser sources in the Galactic Centre (GC) from observations with the Australia Telescope Compact Array between $2010-2014$, along the transitions of the SiO molecule at $v = 1, J = 2-1$ at 86.243 GHz and $v = 2, J = 2-1$ at 85.640 GHz. We also present the results of the 3 mm observations with Atacama Large Millimeter/Submillimeter Array (ALMA). We detected 5 maser sources from the ATCA data, IRS 7, IRS 9, IRS 10EE, IRS 12N, and IRS 28; and 20 sources from the ALMA data including 4 new sources. These sources are predominantly late-type giants or emission line stars with strong circumstellar maser emission. We analyse these sources and calculate their proper motions. We also study the variability of the maser emission. IRS 7, IRS 12N and IRS 28 exhibit long period variability of the order of $1 - 2$ years, while other sources show steady increase or decrease in flux density and irregular variability over observation timescales. This behaviour is consistent with the previous observations.","PeriodicalId":265862,"journal":{"name":"Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123569887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019)最新文献