低红移红外类星体的多波段光谱能量分布性质研究

发布时间：2018-01-01 19:36

本文关键词：低红移红外类星体的多波段光谱能量分布性质研究　出处：《天津师范大学》2013年硕士论文　论文类型：学位论文

【摘要】：我们以近邻宇宙中33个红外类星体为样本,在收集、整理了其从高频X射线到低频射电波段这一基本覆盖全部波段数据的基础上,又针对光学、紫外、红外等波段已有的多种测量结果(不同仪器或者年份得到)进行了对比与检验,对一些数据进行了多种方法的重新测量,以确保数值点的真实有效。在经过消光改正、孔径改正、波长与流量密度退红移、光度归一等系列操作后,我们得到了这个红外类星体样本中每个源的光谱能量分布(SED)以及它们的平均/中值SED。对比研究了我们样本中每个源以及平均后的光谱能量分布与星暴星系、类星体、极亮红外星系以及光学选类星体等(均已在1μm处光度归一)后发现,红外类星体的SED介于极亮红外星系与光学类星体之间；同时它也介于星暴星系与类星体之间：在短波处(波长小于1μm)光学类星体(类星体)的能谱高于红外类星体而极亮红外星系(星暴星系)则较低；在长波处的情形恰好相反。一方面这说明星暴与活动星系核辐射均是红外类星体的主要能量来源,只是这两类能源的贡献分布在不同的波长处。另一方面,这样的结果在全波段能量分布角度说明了红外类星体是一类处于演化中期的源,它们是极亮红外星系向光学类星体演变的中间过程。为进一步得到两类可能的能源主导机制对红外类星体辐射能量贡献的比例,我们通过星暴星系模板与类星体模板线性叠加的方式拟合了红外类星体样本的平均/中值SED。结果显示在红外类星体的高频处,类星体贡献的能量较大；而低频处的能量则主要来源于恒星形成活动。
[Abstract]:Our neighbor in the universe of 33 infrared quasars in the sample collection, sorting from the high frequency X ray to low-frequency radio band the basic coverage of all the bands on the basis of data, and according to the optical, ultraviolet, infrared spectrum of various measurement results of existing (different instruments or by comparing year) with the test of some data to measure a variety of methods, to ensure real and effective numerical point. After extinction correction, aperture correction, wavelength and flux density from photometric redshift, normalized series, we obtain the spectral energy distribution of each source in the infrared QSO sample (SED) and their the average / median SED.
We studied samples of each source and the average spectral energy distribution and the starburst galaxies, quasars, ultraluminous infrared galaxies and optical quasars etc. (already at 1 m was found between normalized) infrared quasar SED between ulirg and optical quasars; at the same time it between the starburst galaxies and quasars: in the short wavelength (wavelength less than 1 m) optical quasars (quasars) spectrum is higher than that of infrared quasars and ultraluminous infrared Galaxy (starburst galaxies) is low; in the long wavelength of the situation is just the opposite. On the one hand that the star bursts and active galactic nuclei radiation is the main energy source of infrared quasars, but these two kinds of energy sources in different wavelength distribution. On the other hand, this results in full band energy distribution point of view that the infrared quasar is a kind of medium in the evolution of the source, they It is the intermediate process of the evolution of extremely bright infrared galaxies to optical quasars.
As a further two possible mechanism leading energy contribution to the infrared radiation energy of the quasar proportion, we through the starburst galaxy and Quasar template template linear superposition way fitting the average / infrared QSO sample median SED. results showed that the high frequency in the infrared quasars, quasars contribute more energy and low frequency; the energy comes from the star formation activity.

【学位授予单位】：天津师范大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P158

【共引文献】