The Gamma-Ray Blazar Content of the Northern Sky.pdf

The Gamma-Ray Blazar Content of the Northern Sky.pdf

  1. 1、本文档共14页,可阅读全部内容。
  2. 2、有哪些信誉好的足球投注网站(book118)网站文档一经付费(服务费),不意味着购买了该文档的版权,仅供个人/单位学习、研究之用,不得用于商业用途,未经授权,严禁复制、发行、汇编、翻译或者网络传播等,侵权必究。
  3. 3、本站所有内容均由合作方或网友上传,本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺!文档内容仅供研究参考,付费前请自行鉴别。如您付费,意味着您自己接受本站规则且自行承担风险,本站不退款、不进行额外附加服务;查看《如何避免下载的几个坑》。如果您已付费下载过本站文档,您可以点击 这里二次下载
  4. 4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等,请点击“版权申诉”(推荐),也可以打举报电话:400-050-0827(电话支持时间:9:00-18:30)。
查看更多
The Gamma-Ray Blazar Content of the Northern Sky

a r X i v : a s t r o - p h / 0 2 1 2 5 0 4 v 2 1 7 F e b 2 0 0 3 ApJ submitted Preprint typeset using LATEX style emulateapj v. 11/12/01 THE GAMMA-RAY BLAZAR CONTENT OF THE NORTHERN SKY David Sowards-Emmerd1, Roger W. Romani Peter F. Michelson1 Department of Physics, Stanford University, Stanford, CA 94305-4060 dse@darkmatter.stanford.edu, rwr@astro.stanford.edu, peterm@stanford.edu ApJ submitted ABSTRACT Using survey data, we have re-evaluated the correlation of flat spectrum radio sources with EGRET sources in the Northern sky. An analysis incorporating the radio and X-ray properties and the γ-ray source localization is used to gauge the reliability of associations and to search for counterparts of previously unidentified EGRET sources. Above |b|=10?, where the classification is complete, we find that 70% of the Northern EGRET sources have counterparts similar to the bright EGRET blazars. For several of these we identify known blazar counterparts more likely than the earlier proposed 3EG association; for ~20 we have new identifications. Spectroscopic confirmation of these candidates is in progress and we have found flat spectrum radio quasars and BL Lac counterparts with redshifts as high as 4. We also find strong evidence for a set of 28 objects with no plausible counterpart like the known EGRET blazars. These thus represent either a new extragalactic population or a population of Galactic objects with a large scale height. The survey has been extended into the plane, where we find several new blazar candidates; the bulk of the sources are, however, Galactic. Looking ahead to the GLAST era, we predict that several of the present 3EG sources are composite and that higher resolution data will break these into multiple blazar IDs. Subject headings: AGN: blazars – surveys: radio – surveys: optical – Gamma Rays 1. introduction The EGRET telescope on the CGRO satellite has de- tected 271 sources in a survey of the Gamma-ray (~ 100MeV to 10GeV) sky. Of these roug

文档评论(0)

l215322 + 关注
实名认证
内容提供者

该用户很懒,什么也没介绍

1亿VIP精品文档

相关文档