dc.contributor.author | Saez, C. | |
dc.contributor.author | Brandt, W. N. | |
dc.contributor.author | Shemmer, O. | |
dc.contributor.author | Chomiuk, L. | |
dc.contributor.author | Lopez, Laura A. | |
dc.contributor.author | Miller, B. P. | |
dc.contributor.author | Vignali, C. | |
dc.contributor.author | Marshall, Herman | |
dc.date.accessioned | 2015-02-26T15:26:25Z | |
dc.date.available | 2015-02-26T15:26:25Z | |
dc.date.issued | 2011-08 | |
dc.date.submitted | 2011-03 | |
dc.identifier.issn | 0004-637X | |
dc.identifier.issn | 1538-4357 | |
dc.identifier.uri | http://hdl.handle.net/1721.1/95650 | |
dc.description.abstract | We report spectral, imaging, and variability results from four new XMM-Newton observations and two new Chandra observations of high-redshift (z ≳4) radio-loud quasars (RLQs). Our targets span lower, and more representative, values of radio loudness than those of past samples of high-redshift RLQs studied in the X-ray regime. Our spectral analyses show power-law X-ray continua with a mean photon index,[ Γ] = 1.74 ± 0.11, that is consistent with measurements of lower redshift RLQs. These continua are likely dominated by jet-linked X-ray emission, and they follow the expected anticorrelation between photon index and radio loudness. We find no evidence of iron Kα emission lines or Compton-reflection continua. Our data also constrain intrinsic X-ray absorption in these RLQs. We find evidence for significant absorption (N[subscript H] ≈ 1.7×10[superscript 22]cm[superscript −2]) in one RLQ of our sample (SDSS J0011+1446); the incidence of X-ray absorption in our sample appears plausibly consistent with that for high-redshift RLQs that have higher values of radio loudness. In the Chandra observation of PMN J2219−2719 we detect apparent extended (∼14 kpc) X-ray emission that is most likely due to a jet; the X-ray luminosity of this putative jet is ≈2% that of the core. The analysis of a 4.9 GHz Very Large Array image of PMN J2219−2719 reveals a structure that matches the X-ray extension found in this source. We also find evidence for long-term (450–460 days) X-ray variability by 80%–100% in two of our targets. | en_US |
dc.language.iso | en_US | |
dc.publisher | IOP Publishing | en_US |
dc.relation.isversionof | http://dx.doi.org/10.1088/0004-637x/738/1/53 | en_US |
dc.rights | Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. | en_US |
dc.source | American Astronomical Society | en_US |
dc.title | THE X-RAY PROPERTIES OF TYPICAL HIGH-REDSHIFT RADIO-LOUD QUASARS | en_US |
dc.type | Article | en_US |
dc.identifier.citation | Saez, C., W. N. Brandt, O. Shemmer, L. Chomiuk, L. A. Lopez, H. L. Marshall, B. P. Miller, and C. Vignali. “THE X-RAY PROPERTIES OF TYPICAL HIGH-REDSHIFT RADIO-LOUD QUASARS.” The Astrophysical Journal 738, no. 1 (August 11, 2011): 53. © 2011 The American Astronomical Society | en_US |
dc.contributor.department | MIT Kavli Institute for Astrophysics and Space Research | en_US |
dc.contributor.mitauthor | Marshall, Herman Lee | en_US |
dc.relation.journal | Astrophysical Journal | en_US |
dc.eprint.version | Final published version | en_US |
dc.type.uri | http://purl.org/eprint/type/JournalArticle | en_US |
eprint.status | http://purl.org/eprint/status/PeerReviewed | en_US |
dspace.orderedauthors | Saez, C.; Brandt, W. N.; Shemmer, O.; Chomiuk, L.; Lopez, L. A.; Marshall, H. L.; Miller, B. P.; Vignali, C. | en_US |
mit.license | PUBLISHER_POLICY | en_US |
mit.metadata.status | Complete | |