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Investigation of WZ Sge-type Dwarf Nova ASASSN-19oc:Optical Spectroscopy and Multicolor Light Curve Analysis

Research in Astronomy and Astrophysics 2024年第8期24卷 20-31页

作者： Viktoriia Krushevska Sergey Shugarov Paolo Ochner Yuliana Kuznyetsova Mykola Petrov Peter Kroll Astronomical Institute of the Slovak Academy of Sciences Tatranska Lomnica05960 VysokéTatrySlovakia Main Astronomical Observatory of NAS of Ukraine 27 Akademika Zabolotnoho St.03143 KyivUkraine inaf—osservatorio astronomico di Padova Vicolo dell’Osservatorio 5I-35122 PadovaItaly Department of Physics and Astronomy University of PadovaVia F.Marzolo 8I-35131 PadovaItaly Max Planck Computing and Data Facility(MPCDF) Gießenbachstrasse 2D-85748 GarchingGermany Sonneberg Observatory Sternwartestr.32D-96515 SonnebergGermany

In this study,we present an investigation of the newly discovered dwarf nova ASASSN-19oc during its superoutburst on 2019 June *** carried out detailed UBVRcIc-photometric observations and also obtained a spectrum on day 7 of the outburst,which shows the presence of hydrogen absorption lines commonly found in dwarf nova *** of photometric data reveals the occurrence of early superhumps in the initial days of observations,followed by ordinary and late *** have accurately calculated the period of the ordinary superhumps as Pord=0.05681(10)days and determined the periods at different stages,as well as the rate of change of the superhump period(P_(dot)=(5)P/P=8.1×10^(-5)).Additionally,we have derived the mass ratio of the components(q=0.09),and estimated the color temperature during the outburst as~11,000 K,the distance to the system(d=560 pc)and absolute magnitude of the system in outburst(MV=5.3).We have shown that outbursts of this star are very rare:based on brightness measurements on 600 archival photographic plates,we found only one outburst that occurred in *** fact,as well as the properties listed above,convincingly shows that the variable ASASSN-19oc is a dwarf nova of WZ Sge type.

关键词： (stars)binaries(including multiple) close-(stars)novae-cataclysmic variables-stars dwarf novae

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Polarization Study of Swift J151857.0–572147 with IXPE Observation

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Research in Astronomy and Astrophysics 2024年第9期24卷 62-67页

作者： Yu-Shan Ling Fei Xie Ming-Yu Ge Fabio La Monaca Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and Technology Guangxi University Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences inaf Istituto di Astrofisica e Planetologia Spaziali dipartimento di Fisica Università degli Studi di Roma “Tor Vergata” dipartimento di Fisica Università degli Studi di Roma “La Sapienza”

We present an analysis of the Imaging X-ray Polarimetry Explorer observation from a newly discovered transient source: Swift J151857.0–572147. The obtained polarization degree(PD) and angle are 0.3% ± 0.3% and-24° ± 26° respectively in 2–8 keV within 68% confidence level errors, and polarization results are below MDP99in all energy bins, with the upper limit on PD of 0.8% in the 2–8 keV energy range. No quasi-periodic oscillations(QPOs) are detected in this observation. The polarization and QPO analyses support the hypothesis that the source was in the high soft state, and the results are consistent with predictions for a thin accretion disk model.

关键词： stars: black holes polarization X-rays: bursts X-RAY-POLARIZATION THIN ACCRETION diSK BLACK-HOLE MODEL

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Lunar orbits for telecommunication and navigation services

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Astrodynamics 2024年第1期8卷 209-220页

作者： Marco Cinelli Emiliano Ortore Giovanni Mengali Alessandro A.Quarta Christian Circi Istituto di Astrofisica e Planetologia Spaziali(IAPS) Istituto Nazionale di Astrofisica(INAF)Via del Fosso del Cavaliere 100Roma00133Italy School of Aerospace Engineering Sapienza University of RomeVia Salaria 881Rome00138Italy Department of Civil and Industrial Engineering University of PisaPisa56122Italy Department of Astronautical Electricaland Energy EngineeringSapienza University of RomeVia Salaria 851Rome00138Italy

Orbits that are frozen in an averaged model,including the effect of a disturbing body laying on the equatorial plane of the primary body and the influence of the oblateness of the primary body,have been applied to probes orbiting the *** this scenario,the main disturbing body is represented by the Earth,which is characterized by a certain obliquity with respect to the equatorial plane of the *** a consequence of this,and of the perturbing effects that are not included in the averaged model,such solutions are not perfectly ***,the orbit eccentricity,inclination,and argument of pericenter present limited variations and can be set to guarantee the fulfillment of requirements useful for lunar telecommunication missions and navigation *** advantage of this,a practical case of a Moon-based mission was investigated to propose useful solutions for potential near-future applications.

关键词： lunar orbits frozen orbits lunar telecommunications lunarnavigation services

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Accretion and jet power in active galactic nuclei

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Research in Astronomy and Astrophysics 2011年第11期11卷 1266-1278页

作者： Luigi Foschini inaf-osservatorio astronomico di Brera Via E. Bianchi 46 23807 Merate (LC) Italy

The classical diagrams of radio loudness and jet power as a function of mass and accretion rate of the central spacetime singularity in active galactic nuclei are reanalyzed by including the data of the recently discovered powerful relativistic jets in Narrow-Line Seyfert 1 Galaxies. The results are studied in the light of the known theories of relativistic jets, indicating that, although the Blandford-Znajek mechanism is sufficient to explain the power radiated by BL Lac Objects, it falls to completely account for the power from quasars and Narrow-Line Seyfert 1 Galaxies. This favors the scenario outlined by Cavaliere ＆ D＇Elia of a composite jet, with a magnetospheric core plus a hydromagnetic component emerging when the accretion power increases and the disk becomes radiation-pressure dominated. A comparison with Galactic compact objects is also made, finding some striking similarities, indicating that since neutron stars are low-mass jet systems analogous to black holes, Narrow-Line Seyfert 1 Galaxies are low-mass counterparts of blazars.

关键词： galaxies jets-BL Lacertae objects general-quasars general-galaxies Seyfert

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On the emission lines in active galactic nuclei with relativistic jets

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Research in Astronomy and Astrophysics 2012年第4期12卷 359-368页

作者： Luigi Foschini inaf-osservatorio astronomico di Brera Via E. Bianchi 46 23807 Merate (LC) Italy

The effect of the observed continuum emitted from a relativistic jet on the measurement of the full width at half maximum （FWHM） of an emission line is analyzed. If the jet contribution is not properly subtracted, the FWHM of the line could seem narrower than it should. The cases of an emission line detected in BL Lac objects and γ-ray Narrow-Line Seyfert 1 galaxies （γ-NLS1s） are addressed. It is shown that the smallness of the observed FWHM of the Lyα lines detected in three well-known BL Lacs is an effect due to the combined action of both the relativistic jet and a weak accretion disk. Once the Doppler boosting effect of the jet continuum is removed, the intrinsic FWHM values of the lines are found to be in the usual range. By contrast, the narrow permitted lines in γ-NLS1s are really narrow, since the disk and the lines are much more powerful. This also confirms that γ-NLS1 is really a new class of γ-ray emitting AGN, different from blazars and radio galaxies.

关键词： line: profiles—galaxies: jets—BL Lacertae Objects: general—galaxies: Seyfert

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Weighing Neutrinos in f(R) Gravity in Light of BICEP2

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Communications in Theoretical Physics 2014年第7期61卷 102-108页

作者：周晓颖何建华 Department of Physics Fudan University inaf-Observatorio astronomico di Brera Via Emilio Bianchi

We constrain the neutrino mass in f(R) gravity using the latest observations from the Planck, BAO and BICEP2 data. We find that the measurement on the B-modes can break the degeneracy between the massive neutrinos and the f(R) gravity. We find a non-zero value of the Compton wavelengths B0 at a 68% confidence level for the f(R) model in the presence of massive neutrinos when the BICEP2 data is used. Furthermore, the tension on the tensor-to-scalar ratios between the measured values from Plank and BICEP2 is significantly reconciled in our model.

关键词： f(R) neutrinos BICEP2

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Toward a stellar population catalog in the Kilo Degree Survey:The impact of stellar recipes on stellar masses and star formation rates

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Science China(Physics,Mechanics & Astronomy) 2023年第12期66卷 203-229页

作者： Linghua Xie Nicola R.Napolitano Xiaotong Guo Crescenzo Tortora Haicheng Feng Antonios Katsianis Rui Li Sirui Wu Mario Radovich Leslie K.Hunt Yang Wang Lin Tang Baitian Tang Zhiqi Huang School of Physics and Astronomy Sun Yat-sen UniversityZhuhai 519082China CSST Science Center for the Guangdong-Hongkong-Macao Greater Bay Area Zhuhai 519082China Institute of Astronomy and Astrophysics Anqing Normal UniversityAnqing 246133China inaf—osservatorio astronomico di Capodimonte Napoli 80131Italy Yunnan Observatories Chinese Academy of SciencesKunming 650011China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China National Astronomical Observatories Chinese Academy of SciencesBeijing 100012China inaf—osservatorio astronomico di Padova Padova 35122Italy inaf—osservatorio astronomico di Arcetri Firenze 50125Italy Peng Cheng Laboratory Shenzhen 518000China School of Physics and Astronomy China West Normal UniversityNanchong 637002China

The Kilo Degree Survey(Ki DS)is currently the only sky survey providing optical(ugri)plus near-infrared(NIR,ZY H JKS)seeing matched photometry over an area larger than 1000 *** is obtained by incorporating the NIR data from the VISTA Kilo Degree Infrared Galaxy(VIKING)survey,covering the same Ki DS *** such,the Ki DS multi-wavelength photometry represents a unique dataset to test the ability of stellar population models to return robust photometric stellar mass(M_(*))and star-formation rate(SFR)*** we use a spectroscopic sample of galaxies for which we possess ugri ZY JHK_(s)“gaussianized”magnitudes from Ki DS data release *** fit the spectral energy distribution from the 9-band photometry using:(1)three different popular libraries of stellar population templates,(2)single burst,simple and delayed exponential star-formation history models,and(3)a wide range of priors on age and *** template fitting codes we use two popular softwares:Le Phare and *** investigate the variance of the stellar masses and the star-formation rates from the different combinations of templates,star formation recipes and codes to assess the stability of these estimates and define some“robust”median quantities to be included in the upcoming Ki DS data *** a science validation test,we derive the mass function,the star formation rate function,and the SFR-M_(*)relation for a low-redshift(z<0.5)sample of galaxies,that result in excellent agreement with previous literature *** final catalog,containing~290000 galaxies with redshift 0.01

关键词： galaxies stellar populations galaxy stellar masses star formation rates stellar mass function

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The star formation history of redshift z^2 galaxies:the role of the infrared prior

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Research in Astronomy and Astrophysics 2014年第1期14卷 15-34页

作者： Lu-Lu Fan Andrea Lapi Alessandro Bressan Mario Nonino Gianfranco De Zotti Luigi Danese Center for Astrophysics University of Science and Technology of China Key Laboratory for Research in Galaxies and Cosmology Chinese Academy of Sciences Astrophysics Sector SISSA dip.Fisica Univ.‘Tor Vergata’Via Ricerca Scientifica 100133 Roma inaf-osservatorio astronomico di Trieste

We build a sample of 298 spectroscopically-confirmed galaxies at redshift z - 2, selected in the z850-band from the GOODS-MUSIC catalog. By utilizing the rest frame 8 p.m luminosity as a proxy of the star formation rate （SFR）, we check the accuracy of the standard SED-fitting technique, finding it is not accurate enough to provide reliable estimates of the physical parameters of galaxies. We then develop a new SED-fitting method that includes the IR luminosity as a prior and a generalized Calzetti law with a variable Rv. Then we exploit the new method to re-analyze our galaxy sample, and to robustly determine SFRs, stellar masses and ages. We find that there is a general trend of increasing attenuation with the SFR. Moreover, we find that the SFRs range between a few to 103 M~ yr-1, the masses from 109 to 4 ~ 1011 Mo, and the ages from a few tens of Myr to more than 1 Gyr. We discuss how individual age measurements of highly attenuated objects indicate that dust must have formed within a few tens of Myr and already been copious at 〈 100 Myr. In addition, we find that low luminosity galaxies harbor, on average, significantly older stellar populations and are also less massive than brighter ones; we discuss how these findings and the well known ＇downsizing＇ scenario are consistent in a framework where less massive galaxies form first, but their star formation lasts longer. Finally, we find that the near-IR attenuation is not scarce for luminous objects, contrary to what is customarily assumed; we discuss how this affects the interpretation of the observed M,/L ratios.

关键词： cosmology: observations- galaxies: evolution- galaxies: high redshift-- galaxies: stellar content -- dust extinction

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Physics and astrophysics of strong magnetic field systems with eXTP

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Science China(Physics,Mechanics & Astronomy) 2019年第2期62卷 74-96页

作者： Andrea Santangelo Silvia Zane Hua Feng RenXin Xu Victor Doroshenko Enrico Bozzo Ilaria Caiazzo Francesco Coti Zelati Paolo Esposito Denis González-Caniulef Jeremy Heyl Daniela Huppenkothen Gianluca Israel ZhaoSheng Li Lin Lin Roberto Mignani Nanda Rea Mauro Orlandini Roberto Taverna Hao Tong Roberto Turolla Cristina Baglio Federico Bernardini Niccolo'Bucciantini Marco Feroci Felix Fürst Ersin G??ü? Can Güngör Long Ji FangJun Lu Antonios Manousakis Sandro Mereghetti romana Mikusincova Biswajit Paul Chanda Prescod-Weinstein George Younes Andrea Tiengo YuPeng Xu Anna Watts Shu Zhang Shuang-Nan Zhang Institut für Astronomie und Astrophysik Eberhard Karls Universität Key Laboratory for Particle Astrophysics Institute of High Energy Physics Mullard Space Science Laboratory University College LondonHolmbury St Mary Department of Engineering Physics and Center for Astrophysics Tsinghua University School of Physics Peking University Department of Astronomy University of Geneva Department of Physics and Astronomy University of British Columbia Universitädell’Insubria Anton Pannekoek Institute for Astronomy University of Amsterdam inaf-osservatorio astronomico di Brera Center for Data Science New York University inaf-osservatorio astronomico di roma Department of Physics Xiangtan University Department of Astronomy Beijing Normal University inaf-Istituto di Astrofisica Spaziale e Fisica Cosmica Milano Janusz Gil Institute of Astronomy University of Zielona Góra Instituto de Ciencias del Espacio(ICE) CSIC-IEEC inaf-Istituto di Astrofisica Spaziale e Fisica Cosmica Bologna Department of Physics and Astronomy University of Padova School of Physics and Electronic Engineering Guangzhou University NYU Abu Dhabi Saadiyat Campus P.O. NAF osservatorio di Arcetri Largo Enrico Fermi 5 inaf-Istituto di Astrofisica e Planetologia Spaziali INFN-roma Tor Vergata European Space Astronomy Centre(ESA/ESAC) Science Operations Department Sabanci University Faculty of Engineering and Natural Sciences Centrum Astronomiczne im.M.Kopernika Department of Physics Sultan Qaboos University Institute of Theoretical Physics Faculty of Mathematics and PhysicsCharles University in Prague Raman Research Institute Sadashivanagar Department of Astronomy University of Washington The George Washington University Physics department 725 21st St NW Scuola Universitaria Superiore IUSS Pavia Palazzo del Broletto

In this paper we present the science potential of the enhanced X-ray Timing and Polarimetry(eXTP) mission for studies of strongly magnetized objects. We will focus on the physics and astrophysics of strongly magnetized objects, namely magnetars, accreting X-ray pulsars, and rotation powered pulsars. We also discuss the science potential of eXTP for QED studies. Developed by an international Consortium led by the Institute of High Energy Physics of the Chinese Academy of Sciences, the eXTP mission is expected to be launched in the mid 2020s.

关键词： neutron stars QED magnetars accreting pulsars eXTP

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Accretion in strong field gravity with eXTP

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Science China(Physics,Mechanics & Astronomy) 2019年第2期62卷 45-73页

作者： Alessandra De Rosa Phil Uttley LiJun Gou Yuan Liu Cosimo Bambi didier Barret Tomaso Belloni Emanuele Berti Stefano Bianchi Ilaria Caiazzo Piergiorgio Casella Marco Feroci Valeria Ferrari Leonardo Gualtieri Jeremy Heyl Adam Ingram Vladimir Karas FangJun Lu Bin Luo Giorgio Matt Sara Motta Joseph Neilsen Paolo Pani Andrea Santangelo XinWen Shu JunFeng Wang Jian-Min Wang YongQuan Xue YuPeng Xu WeiMin Yuan YeFei Yuan Shuang-Nan Zhang Shu Zhang Ivan Agudo Lorenzo Amati Nils Andersson Cristina Baglio Pavel Bakala Altan Baykal Sudip Bhattacharyya Ignazio Bombaci NiccolóBucciantini Fiamma Capitanio Riccardo Ciolfi Wei K.Cui Filippo D'Ammando Thomas Dauser Melania Del Santo Barbara De Marco Tiziana di Salvo Chris Done Michal Dovciak Andrew C.Fabian Maurizio Falanga Angelo Francesco Gambino Bruce Gendre Victoria Grinberg Alexander Heger Jeroen Homan Rosario Iaria JiaChen Jiang ChiChuan Jin Elmar Koerding Manu Linares Zhu Liu Thomas J.Maccarone Julien Malzac Antonios Manousakis Frédéric Marin Andea Marinucci Missagh Mehdipour Mariano Méndez Simone Migliari Cole Miller Giovanni Miniutti Emanuele Nardini Paul T.O'Brien Julian P.Osborne Pierre Olivier Petrucci Andrea Possenti Alessandro Riggio Jerome Rodriguez Andrea Sanna LiJing Shao Malgosia Sobolewska Eva Sramkova Abigail L.Stevens Holger Stiele Giulia Stratta Zdenek Stuchlik Jiri Svoboda Fabrizio Tamburini Thomas M.Tauris Francesco Tombesi Gabriel Torok Martin Urbanec Frederic Vincent QingWen Wu Feng Yuan Jean J.M.in't Zand Andrzej A.Zdziarski XinLin Zhou inaf-Istituto di Astrofisica e Planetologie Spaziali Via Fosso del Cavaliere Anton Pannekoek Institute for Astronomy University of Amsterdam National Astronomical Observatories Chinese Academy of Science Institute of High Energy Physics Chinese Academy of Science Center for Field Theory and Particle Physics and Department of Physics Fudan University IRAP Universitéde ToulouseCNRSUPSCNES inaf-osservatorio astronomico di Brera Department of Physics and Astronomy The University of MississippiUniversity dipartimento di Matematica e Fisica Universitàdegli studi Roma Tre University of British Columbia inaf-osservatorio astronomico di roma INFN-roma 2 c/o dipartimento di Fisica II Universit?di Roma"Tor Vergata" dipartimento di Fisica Universitàdegli Studi di Roma"La Sapienza"&Sezione INFN Roma1 Department of Physics University of OxfordClarendon Laboratory Astronomical Institute Academy of Sciences School of Astronomy and Space Science Nanjing University MIT Kavli Institute for Astrophysics and Space Research Institut für Astronomie und Astrophysik Eberhard Karls Universität Department of Physics Anhui Normal University Department of Astronomy and Institute of Theoretical Physics and Astrophysics Xiamen University CAS Key Laboratory for Research in Galaxies and Cosmology Department of AstronomyUniversity of Science and Technology of China Instituto de Astrofísica de Andalucia(CSIC) Glorieta de la Astronomía s/n inaf-Istituto di Astrofisica Spaziale e Fisica cosmica di Bologna Mathematical Sciences and STAG Research Centre University of Southampton New York University Abu Dhabi Institute of Physics and Research Centre for Computational Physics and Data Processing Faculty of Philosophy&ScienceSilesian University in OpavaíBezru?ovo nám. Department of Physics Middle East Technical University Department of Astronomy and Astrophysics Tata Institute of Fundamental Research dipartimento di Fisica Universit?di Pisa&INFN inaf-osservatorio Astrofisico di Arcetri inaf-osservatorio astronomico di Padova INFN-TIFPA Trento Ins

In this paper we describe the potential of the enhanced X-ray Timing and Polarimetry(eXTP) mission for studies related to accretion flows in the strong field gravity regime around both stellar-mass and supermassive black-holes. eXTP has the unique capability of using advanced "spectral-timing-polarimetry" techniques to analyze the rapid variations with three orthogonal diagnostics of the flow and its geometry, yielding unprecedented insight into the inner accreting regions, the effects of strong field gravity on the material within them and the powerful outflows which are driven by the accretion process.

关键词： X-ray black holes physics accretion

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