<i><b>NuSTAR</b></i> View of TeV Blazar Mrk 501
We report the results of flux and spectral variability studies of all seven <i>Nuclear Spectroscopic Telescope Array (NuSTAR)</i> observations of TeV <inline-formula><math display="inline"><semantics><mrow><mi>γ</mi><mo>-</mo><...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-07-01
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| Series: | Galaxies |
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| Online Access: | https://www.mdpi.com/2075-4434/8/3/55 |
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| author | Ashwani Pandey |
| author_facet | Ashwani Pandey |
| author_sort | Ashwani Pandey |
| collection | DOAJ |
| description | We report the results of flux and spectral variability studies of all seven <i>Nuclear Spectroscopic Telescope Array (NuSTAR)</i> observations of TeV <inline-formula><math display="inline"><semantics><mrow><mi>γ</mi><mo>-</mo></mrow></semantics></math></inline-formula>ray emitting blazar Markarian (or Mrk) 501. We found strong evidence of intraday variability in 3–79 keV X-ray light curves (LCs) of Mrk 501 during four out of these seven observations. We examined spectral variability using a model-independent hardness-ratio analysis and found a general “harder-when-brighter” behaviour in two observations. We also investigated the nature of 3–79 keV X-ray spectra of TeV blazar Mrk 501 and found that five out of seven spectra are well described by the curved log-parabola models with photon indices (at 10 keV) <inline-formula><math display="inline"><semantics><mrow><mi>α</mi><mo>∼</mo></mrow></semantics></math></inline-formula> 2.12–2.32 and a curvature <inline-formula><math display="inline"><semantics><mrow><mi>β</mi><mo>∼</mo></mrow></semantics></math></inline-formula> 0.15–0.28. The two other spectra are somewhat better represented by simple power-law models with photon indices 2.70 and 2.75. We briefly discuss available physical models to explain our results. |
| first_indexed | 2024-03-10T18:12:58Z |
| format | Article |
| id | doaj.art-5bafe378c0a54ecbbc9b75ff914460f5 |
| institution | Directory Open Access Journal |
| issn | 2075-4434 |
| language | English |
| last_indexed | 2024-03-10T18:12:58Z |
| publishDate | 2020-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Galaxies |
| spelling | doaj.art-5bafe378c0a54ecbbc9b75ff914460f52023-11-20T07:58:39ZengMDPI AGGalaxies2075-44342020-07-01835510.3390/galaxies8030055<i><b>NuSTAR</b></i> View of TeV Blazar Mrk 501Ashwani Pandey0Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital 263001, IndiaWe report the results of flux and spectral variability studies of all seven <i>Nuclear Spectroscopic Telescope Array (NuSTAR)</i> observations of TeV <inline-formula><math display="inline"><semantics><mrow><mi>γ</mi><mo>-</mo></mrow></semantics></math></inline-formula>ray emitting blazar Markarian (or Mrk) 501. We found strong evidence of intraday variability in 3–79 keV X-ray light curves (LCs) of Mrk 501 during four out of these seven observations. We examined spectral variability using a model-independent hardness-ratio analysis and found a general “harder-when-brighter” behaviour in two observations. We also investigated the nature of 3–79 keV X-ray spectra of TeV blazar Mrk 501 and found that five out of seven spectra are well described by the curved log-parabola models with photon indices (at 10 keV) <inline-formula><math display="inline"><semantics><mrow><mi>α</mi><mo>∼</mo></mrow></semantics></math></inline-formula> 2.12–2.32 and a curvature <inline-formula><math display="inline"><semantics><mrow><mi>β</mi><mo>∼</mo></mrow></semantics></math></inline-formula> 0.15–0.28. The two other spectra are somewhat better represented by simple power-law models with photon indices 2.70 and 2.75. We briefly discuss available physical models to explain our results.https://www.mdpi.com/2075-4434/8/3/55galaxies: activeBL lacertae objects: generalBL lacertae objects: individual (mrk 501) |
| spellingShingle | Ashwani Pandey <i><b>NuSTAR</b></i> View of TeV Blazar Mrk 501 Galaxies galaxies: active BL lacertae objects: general BL lacertae objects: individual (mrk 501) |
| title | <i><b>NuSTAR</b></i> View of TeV Blazar Mrk 501 |
| title_full | <i><b>NuSTAR</b></i> View of TeV Blazar Mrk 501 |
| title_fullStr | <i><b>NuSTAR</b></i> View of TeV Blazar Mrk 501 |
| title_full_unstemmed | <i><b>NuSTAR</b></i> View of TeV Blazar Mrk 501 |
| title_short | <i><b>NuSTAR</b></i> View of TeV Blazar Mrk 501 |
| title_sort | i b nustar b i view of tev blazar mrk 501 |
| topic | galaxies: active BL lacertae objects: general BL lacertae objects: individual (mrk 501) |
| url | https://www.mdpi.com/2075-4434/8/3/55 |
| work_keys_str_mv | AT ashwanipandey ibnustarbiviewoftevblazarmrk501 |