中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Salt long-slit spectroscopy of quasar he 0435-4312: fast displacement of the mg ii emission line

文献类型:期刊论文

作者Sredzinska, J.1; Czerny, B.1,2; Hryniewicz, K.1; Krupa, M.3; Kurcz, A.3; Marziani, P.4; Adhikari, T. P.1; Basak, R.1; You, B.1; Wang, J. -M.5
刊名Astronomy & astrophysics
出版日期2017-05-01
卷号601页码:15
ISSN号1432-0746
关键词Accretion, accretion disks Black hole physics Line: profiles Galaxies: active Quasars: emission lines Quasars: individual: he 0435-4312
DOI10.1051/0004-6361/201628257
通讯作者Czerny, b.(bcz@camk.edu.pl)
英文摘要Context. the mg ii emission line is visible in the optical band for intermediate redshift quasars (0 : 4 < z < 1 : 6) and it is thus an extremely important tool to measure the black hole mass and to understand the structure of the broad line region (blr). aims. we aim to determine the substructure and the variability of the mg ii line with the aim to identify which part of the line comes from a medium in keplerian motion. methods. using the southern african large telescope (salt) with the robert stobie spectrograph (rss) we performed ten spectroscopic observations of quasar he 0435-4312 (z = 1 : 2231) over a period of three years (dec. 23/24, 2012 to dec. 7/8, 2015). results. both the mg ii line and the fe ii pseudo-continuum increase with time. we clearly detect the systematic shift of the mg ii line with respect to the fe ii over the years, corresponding to the acceleration of 104 +/- 14 km s(-1) yr(-1) in the quasar rest frame. the mg ii line shape is clearly non-gaussian but single-component, and the increase in line equivalent width and line shift is not accompanied with significant evolution of the line shape. we analyse the conditions in the mg ii and fe ii formation region and we note that the very large difference in the covering factor and the turbulent velocity also support the conclusion that the two regions are spatially separated. conclusions. the measured acceleration of the line systematic shift is too large to connect it with the orbital motion at a distance of the blr in this source. it may imply a precessing inner disk illuminating the blr. further monitoring is still needed to better constrain the variability mechanism.
WOS关键词ACTIVE GALACTIC NUCLEI ; CENTRAL BLACK-HOLE ; HIGH-LUMINOSITY QUASARS ; HIGH-REDSHIFT QUASARS ; PEAKED BALMER LINES ; NGC 5548 ; OPTICAL-SPECTRA ; INTERMEDIATE-REDSHIFT ; SUPERMASSIVE BINARY ; EMITTING REGIONS
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
语种英语
出版者EDP SCIENCES S A
WOS记录号WOS:000402313500032
URI标识http://www.irgrid.ac.cn/handle/1471x/2177354
专题高能物理研究所
通讯作者Czerny, B.
作者单位1.Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Bartycka 18, PL-00716 Warsaw, Poland
2.Polish Acad Sci, Ctr Theoret Phys, Al Lotnikow 32-46, PL-02668 Warsaw, Poland
3.Jagiellonian Univ, Astron Observ, Orla 171, PL-30244 Krakow, Poland
4.Osserv Astron Padova, INAF, I-35122 Padua, Italy
5.Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, 19B Yuquan Rd, Beijing 100049, Peoples R China
6.Leiden Univ, Leiden Observ, Niels Bohrweg 2, NL-2333 CA Leiden, Netherlands
推荐引用方式
GB/T 7714
Sredzinska, J.,Czerny, B.,Hryniewicz, K.,et al. Salt long-slit spectroscopy of quasar he 0435-4312: fast displacement of the mg ii emission line[J]. Astronomy & astrophysics,2017,601:15.
APA Sredzinska, J..,Czerny, B..,Hryniewicz, K..,Krupa, M..,Kurcz, A..,...&Bilicki, M..(2017).Salt long-slit spectroscopy of quasar he 0435-4312: fast displacement of the mg ii emission line.Astronomy & astrophysics,601,15.
MLA Sredzinska, J.,et al."Salt long-slit spectroscopy of quasar he 0435-4312: fast displacement of the mg ii emission line".Astronomy & astrophysics 601(2017):15.

入库方式: iSwitch采集

来源:高能物理研究所

浏览0
下载0
收藏0
其他版本

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。