共查询到20条相似文献,搜索用时 15 毫秒
1.
韩金林 《中国天文和天体物理学报》1995,(2)
研究表明,高频射电源与低频射电源相比,前者中的类星体比例更大。3CR低频射电源(S178MHz>9Jy)中有17.8%是类星体,而在2.7GHz亮射电源样本中(S2.7GHz≥2.0Jy),有35.6%是类星体。更有趣的是,518个5GHz亮射电源中(S5GHz≥1.0Jy),至少有291个(≥56%)是类星体。因此,我们认为高频亮射电源的证认是发现类星体的有效手段。 相似文献
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Pei-sheng Chen Hong-guang Shan Pin Zhang Yi-fei Gao 《Astrophysics and Space Science》2006,302(1-4):17-25
The 2MASS observation of the infrared quasars (IR QSOs) known so far is presented in this paper. Compared with the optical
selected quasars, infrared quasars are more dust-enshrouded and have redder colors and steeper spectral indices in the near
infrared. In consequence, they are much younger than the optical selected quasars. The result may be helpful to the suggestion
that the evolution links could be the ULIRGs - > the IR QSOs - > the optical selected quasars.
This publication makes use of data products from the Two Micron All Sky Survey (2MASS), which is a joint project of the University
of Massachusetts and the Infrared Processing and Analysis Center, funded by the National Aeronautics and Space Administration
and the National Science Foundation of the United States. 相似文献
4.
Halton Arp 《Journal of Astrophysics and Astronomy》1986,7(2):77-81
Quasars found from objective prism searches have been reported to show no association with galaxies in the Virgo Cluster.
A simple analysis here shows significant association of the brightest of these quasars with core galaxies in the Virgo Cluster.
Alexander von Humboldt Senior Scientist, awardee at the Max-Planck-Institut für Astrophysik, Garching, FRG. 相似文献
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Xue-Bing Wu Wei Zhang Xu Zhou Department of Astronomy School of Physics Peking University Beijing National Astronomical Observatories Chinese Academy of Sciences Beijing 《中国天文和天体物理学报》2004,4(1):17-27
With a recently constructed composite quasar spectrum and the X2 minimization technique, we describe a general method for estimating the photometric redshifts of a large sample of quasars by deriving theoretical color-redshift relations and comparing the theoretical colors with the observed ones. We estimated the photometric redshifts from the 5-band SDSS photometric data of 18678 quasars in the first major data release of SDSS and compared them with their spectroscopic redshifts. The difference is less than 0.1 for 47% of the quasars and less than 0.2 for 68%. Based on the calculation of the theoretical color-color diagrams of stars, galaxies and quasars both on the SDSS system and on the BATC system, we expect that we would be able to select candidates of high redshift quasars more efficaciously with the latter than with the former, provided the BATC survey can detect objects with magnitudes fainter than 21. 相似文献
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通过对2000年版Veron类星体星表和NVSS巡天数据进行交叉证认,得到了301颗新发现有射电辐射的类星体.计算了射电类星体的射电话指数、射电光度、偏振度等物理量并进行了统计分析,讨论了射电类星体所占比例随红移和绝对星等的分布,以及偏振度随红移的演化关系.结果发现,强射电类星体在所有类星体中所占的比例F(RLQ)随着MB的增加而增大,随红移的演化是从。=0.0到z=0.8逐渐上升,在z=1.5附近开始缓慢下降,到z= 2.0附近降到谷底,然后又有上升趋势.射电偏振度大部分小于 4.0%,偏振度越小,类星体数目越多.而射电偏振度与红移之间似乎没有相关性. 相似文献
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We examine a Doppler theory of quasars in which it is assumed that a fraction of the total population of quasars are fired
from centres of explosion with moderate cosmological redshifts. It is argued that the substantial part of the redshift of
a typical high redshift quasar could be of Doppler origin. If Hoyle’s recent hypothesis that quasars emit the bulk of their
radiation in a narrow backward cone is given a quantitative form, it is shown that the kinematic and emission parameters of
this model can explain the observed features of the four aligned triplets of quasars discovered by Arp and Hazard (1980) and
by Saslaw (personal communication). The model predicts a small but nonzero fraction of quasars with blueshifts. Further observational
tests of the model are discussed. 相似文献
10.
1997-1998年期间,使用2.16m望远镜对ROSATX射线源进行光学证认,证认出4个ROSATX射线源是新发现的类星体,2个ROSATX射线源是新发现的赛弗特星系. 相似文献
11.
Wei-Hao Bian Hong Dong Yong-Heng Zhao National Astronomical Observatories Chinese Academy of Sciences Beijing Department of Physics Nanjing Normal University Nanjing Department of Physics Shangqiu Teachers College Shangqiu 《中国天文和天体物理学报》2004,4(1):61-66
In a previous paper, it was suggested that contamination of the nuclear luminosity by the host galaxy plays an important role in determining the parameters of the standard a disk of AGNs. Using the nuclear absolute B band magnitude instead of the total absolute B band magnitude, we have recalculated the central black hole masses, accretion rates and disk inclinations for 20 Seyfert 1 galaxies and 17 Palomar-Green (PG) quasars. It is found that a small value of a is needed for the Seyfert 1 galaxies than for the PG quasars. This difference in a possibly leads to the different properties of Seyfert 1 galaxies and quasars. Furthermore, we find most of the objects in this sample are not accreting at super-Eddington rates if we adopt the nuclear optical luminosity in our calculation. 相似文献
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Xue-Guang Zhang Ting-Gui Wang You-Jun LuCenter for Astrophysics and Department of Astronomy Applied Physics University of Science Technology of China Hefei zxg@mail.ustc.edu.cn 《中国天文和天体物理学报》2003,3(3):212-224
The question whether the radio properties of quasars are related to the mass of the central black hole or the accretion rate is important for our understanding of the formation of relativistic jets, but no consensus has been reached from statistical analyses. Using two large quasar samples, one radio-selected, one optical-selected, we re-exarnined these relations and find that previous differences between radio- and optical- selected samples can be ascribed, at least partly, to the effect of the narrow line component. All previous claimed correlations are much weaker, if exist at all. 相似文献
14.
A. Denis-Karafistan 《Astronomische Nachrichten》1998,319(5):319-324
The principal component analysis method has been applied to two samples of nearby and distant quasars with well known radio data. Relationships between physical parameters pertinent to radio morphology has been searched and the significant number of dimensions of the manifold has been found to be two. The results of this analysis confirm the existence of a redshift luminosity correlation for a subset of 36 nearby, but to a lesser extent for 43 distant, quasars. An anticorrelation seems to exist between luminosity and linear sizes for the last sample. On the other hand, application of this analysis to the above samples indicates no correlation between the viewing angle and the other physical parameters. 相似文献
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Paolo Padovani Eric Perlman Hermine Landt Paolo Giommi Matteo Perri 《Astrophysics and Space Science》2004,294(1-2):71-78
We present a new population of radio quasars whose X-ray band, unlike previously known sources which have (flat) inverse Compton
radiation, is characterized by (steep) synchrotron emission, with a broad-band spectral energy distribution similar to that
of BL Lacs with high energy synchrotron peaks. We discuss how this new class was discovered, the class properties, and the
implications of its existence for our understanding of jets and active galactic nuclei in general. 相似文献
17.
Julia M. Riley Steve Rawlings Richard G. McMahon Katherine M. Blundell Philip Miller Mark Lacy Elizabeth M. Waldram 《Monthly notices of the Royal Astronomical Society》1999,307(2):293-314
We describe the selection of candidate radio-loud quasars obtained by cross-matching radio source positions from the low-frequency (151-MHz) 7C survey with optical positions from five pairs of EO POSS-I plates scanned with the Cambridge Automatic Plate-measuring Machine (APM). The sky region studied is centred at RA 10h 28m , Dec.+41° and covers ≈0.057 sr. We present VLA observations of the quasar candidates, and tabulate various properties derived from the radio maps. We discuss the selection criteria of the resulting '7CQ' sample of radio-loud quasars. The 70 confirmed quasars, and some fraction of the 36 unconfirmed candidates, constitute a filtered sample with the following selection criteria: 151-MHz flux density S 151 >100 mJy; POSS-I E -plate magnitude E ≈ R <20; POSS-I colour ( O E )<1.8; the effective area of the survey drops significantly below S 151 ≈200 mJy. We argue that the colour criterion excludes few if any quasars, but note, on the basis of recent work by Willott et al., that the E magnitude limit probably excludes more than 50 per cent of the radio-loud quasars. 相似文献
18.
We investigate the MBH-O'.relation for radio-loud quasars with redshift z<0.83 in Data Release 3 of the Sloan Digital Sky Survey (SDSS).The sample consists of 3772 quasars with better models of the H/~ and [O III] lines and available radio luminosity,including 306 radio-loud quasars,3466 radio-quiet quasars with measured radio luminosity or upper-limit of radio luminosity (181 radio-quiet quasars with measured radio luminosity).The virial supermassive black hole mass (MBH) is calculated from the broad H/line,and the host stellar velocity dispersion (σ*) is traced by the core [O III] gaseous velocity dispersion.The radio luminosity and radio loudness are derived from the FIRST catalog.Our results are as follows:(1) For radio-quiet quasars,we confirm that there is no obvious deviation from the MBH-O".relation defined for inactive galaxies when the uncertainties in MBH and the luminosity bias are concerned.(2) We find that the radio-loud quasars deviate more from the MBH-σ.relation than do the radio-quiet quasars.This deviation is only partly due to a possible cosmological evolution of the MBH-σ* relation and the luminosity bias.(3) The radioluminosity is proportional to M128 0.23-0.16 BH(LBol/LEdd)1.29 0.31-0.24 for radio-quiet quasars and to M3.10 0.6.-0.70(LBol.LEdd)4.18 1.40-1.10 for radio-loud quasars.The weaker dependence of the radio luminosity on the mass and the Eddington ratio for radio-loud quasars shows that other physical effects would account for their radio luminosities,such as the spin of the black hole. 相似文献
19.
利用高精度数值模拟的结果修正了高红移类星体(QSO)电离和加热中性气体的理论模拟,并预测了500m口径球面射电望远镜(Five-hundred-meter Aperture Spherical Telescope, FAST)观测QSO周围21 cm辐射的信号特征以及信噪比,得出如下结论:(1)红移z=8且光度与ULAS J1120+0641一致的QSO在FAST望远镜视场下的21 cm频率谱有完整的HII区,但在z=10且较低QSO光度下的21 cm频率谱仅有一个小的凹陷;(2)光子有限旅行时间(Finite Light Travel Time, FLTT)效应明显改变高红移QSO的21 cm频率谱,使得较低频率端的过渡曲线明显比较高频率端陡;(3)使用FAST望远镜观测高红移QSO的21 cm辐射的信噪比非常高,最高可达~12,因此可以很好地识别HII区和FLTT效应. 相似文献