THE X-RAY PROPERTIES OF TYPICAL HIGH-REDSHIFT RADIO-LOUD QUASARS
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 st...
| Main Authors: | , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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IOP Publishing
2015
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| Online Access: | http://hdl.handle.net/1721.1/95650 |
| _version_ | 1826216037719212032 |
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| author | Saez, C. Brandt, W. N. Shemmer, O. Chomiuk, L. Lopez, Laura A. Miller, B. P. Vignali, C. Marshall, Herman |
| author2 | MIT Kavli Institute for Astrophysics and Space Research |
| author_facet | MIT Kavli Institute for Astrophysics and Space Research Saez, C. Brandt, W. N. Shemmer, O. Chomiuk, L. Lopez, Laura A. Miller, B. P. Vignali, C. Marshall, Herman |
| author_sort | Saez, C. |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T16:41:18Z |
| format | Article |
| id | mit-1721.1/95650 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:41:18Z |
| publishDate | 2015 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/956502022-09-29T20:45:25Z THE X-RAY PROPERTIES OF TYPICAL HIGH-REDSHIFT RADIO-LOUD QUASARS Saez, C. Brandt, W. N. Shemmer, O. Chomiuk, L. Lopez, Laura A. Miller, B. P. Vignali, C. Marshall, Herman MIT Kavli Institute for Astrophysics and Space Research Marshall, Herman Lee 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. 2015-02-26T15:26:25Z 2015-02-26T15:26:25Z 2011-08 2011-03 Article http://purl.org/eprint/type/JournalArticle 0004-637X 1538-4357 http://hdl.handle.net/1721.1/95650 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 http://dx.doi.org/10.1088/0004-637x/738/1/53 Astrophysical Journal 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. application/pdf IOP Publishing American Astronomical Society |
| spellingShingle | Saez, C. Brandt, W. N. Shemmer, O. Chomiuk, L. Lopez, Laura A. Miller, B. P. Vignali, C. Marshall, Herman THE X-RAY PROPERTIES OF TYPICAL HIGH-REDSHIFT RADIO-LOUD QUASARS |
| title | THE X-RAY PROPERTIES OF TYPICAL HIGH-REDSHIFT RADIO-LOUD QUASARS |
| title_full | THE X-RAY PROPERTIES OF TYPICAL HIGH-REDSHIFT RADIO-LOUD QUASARS |
| title_fullStr | THE X-RAY PROPERTIES OF TYPICAL HIGH-REDSHIFT RADIO-LOUD QUASARS |
| title_full_unstemmed | THE X-RAY PROPERTIES OF TYPICAL HIGH-REDSHIFT RADIO-LOUD QUASARS |
| title_short | THE X-RAY PROPERTIES OF TYPICAL HIGH-REDSHIFT RADIO-LOUD QUASARS |
| title_sort | x ray properties of typical high redshift radio loud quasars |
| url | http://hdl.handle.net/1721.1/95650 |
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