New quasars behind the Magellanic Clouds. Spectroscopic confirmation of near-infrared selected candidates
New quasars behind the Magellanic Clouds. Spectroscopic confirmation of near-infrared selected candidates
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麦哲伦云后面的新类星体。
DOI：
10.1051/0004-6361/201527398
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发表时间：
2015-10
影响因子：
6.5
通讯作者：
For Bi-Qing
中科院分区：
文献类型：
--
作者：
Ivanov Valentin D.;Cioni Maria-Rosa L.;Bekki Kenji;de Grijs Richard;Emerson Jim;Gibson Brad K.;Kamath Devika;van Loon Jacco Th.;Piatti Andres E.;For Bi-Qing
上下文。位于附近星系后面的准恒星物体(类星体)为天文测量研究提供了一个很好的绝对参照系，但由于受到前后和背景的污染，它们很难识别。要获得对这类星体的完整普查，需要对附近星系的整个区域进行深、宽视场、高角度分辨率的调查。目标。我们开始了一项计划，在大小麦哲伦云、麦哲伦桥和连接云与银河系的麦哲伦流后面扩大类星体参考系。方法：研究方法。数百个类星体候选者是根据它们的近红外颜色和可变性属性从正在进行的ESO Vista麦哲伦云公共调查中挑选出来的。对49个对象的子集进行了光学光谱学跟踪。结果。我们确认了37个天体的类星体性质(34个新的识别)：4个是低红移天体，3个可能是恒星，其余3个缺乏显著的光谱特征来进行安全分类。真正的类星体位于LMC后面10个，SMC后面13个，桥后面14个。类星体的红移范围从z~0.5到z~4.1。结论。VMC调查完成后，预计将产生总计~1,500颗类星体，Y<；19.32 ，J<；19.09 ，Ks<；18.04 。
Context. Quasi-stellar objects (quasars) located behind nearby galaxies provide an excellent absolute reference system for astrometric studies, but they are difficult to identify because of fore- and background contamination. Deep wide-field, high angular resolution surveys spanning the entire area of nearby galaxies are needed to obtain a complete census of such quasars. Aims. We embarked on a program to expand the quasar reference system behind the Large and the Small Magellanic Clouds, the Magellanic Bridge, and the Magellanic Stream that connects the Clouds with the Milky Way. Methods. Hundreds of quasar candidates were selected based on their near-infrared colors and variability properties from the ongoing public ESO VISTA Magellanic Clouds survey. A subset of 49 objects was followed up with optical spectroscopy. Results. We confirmed the quasar nature of 37 objects (34 new identifications): four are low redshift objects, three are probably stars, and the remaining three lack prominent spectral features for a secure classification. The bona fide quasars, identified from their broad emisison lines, are located as follows: 10 behind the LMC, 13 behind the SMC, and 14 behind the Bridge. The quasars span a redshift range from z ~ 0.5 to z ~ 4.1. Conclusions. Upon completion the VMC survey is expected to yield a total of ~1500 quasars with Y< 19.32 mag, J< 19.09 mag, and Ks< 18.04 mag.
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影响因子：
4.8
作者：
V. Ripepi;M. Marconi;M. Moretti;G. Clementini;M. Cioni;R. Grijs;J. Emerson;M. Groenewegen
通讯作者：
V. Ripepi;M. Marconi;M. Moretti;G. Clementini;M. Cioni;R. Grijs;J. Emerson;M. Groenewegen
DOI：
10.1088/0004-637x/746/1/27
发表时间：
2011-06
期刊：
The Astrophysical Journal
影响因子：
--
作者：
S. Kozłowski;C. Kochanek;A. Jacyszyn;A. Udalski;M. Szymański;R. Poleski;M. Kubiak;I. Soszyński;G. Pietrzyński;Ł. Wyrzykowski;K. Ulaczyk;P. Pietrukowicz
通讯作者：
S. Kozłowski;C. Kochanek;A. Jacyszyn;A. Udalski;M. Szymański;R. Poleski;M. Kubiak;I. Soszyński;G. Pietrzyński;Ł. Wyrzykowski;K. Ulaczyk;P. Pietrukowicz
影响因子：
4.8
作者：
Piatti Andres E.;de Grijs Richard;Ripepi Vincenzo;Ivanov Valentin D.;Cioni Maria-Rosa L.;Marconi Marcella;Rubele Stefano;Bekki Kenji;For Bi-Qing
通讯作者：
For Bi-Qing
影响因子：
6.5
作者：
M. Cioni;D. Kamath;S. Rubele;J. V. Loon;P. Wood;J. Emerson;B. Gibson;M. Groenewegen;V. Ivanov;B. Miszalski;V. Ripepi
通讯作者：
M. Cioni;D. Kamath;S. Rubele;J. V. Loon;P. Wood;J. Emerson;B. Gibson;M. Groenewegen;V. Ivanov;B. Miszalski;V. Ripepi
影响因子：
4.8
作者：
T. Muraveva;G. Clementini;C. Maceroni;C. Evans;M. Moretti;M. Moretti;M. Cioni;J. Marquette;V. Ripepi;R. Grijs;M. Groenewegen;A. Piatti;J. V. Loon
通讯作者：
T. Muraveva;G. Clementini;C. Maceroni;C. Evans;M. Moretti;M. Moretti;M. Cioni;J. Marquette;V. Ripepi;R. Grijs;M. Groenewegen;A. Piatti;J. V. Loon