Deep NuSTAR and Swift Monitoring Observations of the Magnetar 1E 1841-045
We report on a 350-ks NuSTAR observation of the magnetar 1E 1841-045 taken in 2013 September. During the observation, NuSTAR detected six bursts of short duration, with \(T_{90}
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| creator | An, Hongjun Archibald, Robert F Hascoet, Romain Kaspi, Victoria M Beloborodov, Andrei M Archibald, Anne M Beardmore, Andy Boggs, Steven E Christensen, Finn E Craig, William W Gehrels, Niel Hailey, Charles J Harrison, Fiona A Kennea, Jamie Kouveliotou, Chryssa Stern, Daniel Younes, George Zhang, William W |
| description | We report on a 350-ks NuSTAR observation of the magnetar 1E 1841-045 taken in 2013 September. During the observation, NuSTAR detected six bursts of short duration, with \(T_{90} |
| doi_str_mv | 10.48550/arxiv.1505.03570 |
| format | Article |
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During the observation, NuSTAR detected six bursts of short duration, with \(T_{90}<1\) s. An elevated level of emission tail is detected after the brightest burst, persisting for \(\sim\)1 ks. The emission showed a power-law decay with a temporal index of 0.5 before returning to the persistent emission level. The long observation also provided detailed phase-resolved spectra of the persistent X-ray emission of the source. By comparing the persistent spectrum with that previously reported, we find that the source hard-band emission has been stable over approximately 10 years. The persistent hard X-ray emission is well fitted by a coronal outflow model, where \(e^{+/-}\) pairs in the magnetosphere upscatter thermal X-rays. Our fit of phase-resolved spectra allowed us to estimate the angle between the rotational and magnetic dipole axes of the magnetar, \(\alpha_{mag}=0.25\), the twisted magnetic flux, \(2.5\times10^{26}\rm \ G\ cm^2\), and the power released in the twisted magnetosphere, \(L_j=6\times10^{36}\rm \ erg\ s^{-1}\). Assuming this model for the hard X-ray spectrum, the soft X-ray component is well fit by a two-blackbody model, with the hotter blackbody consistent with the footprint of the twisted magnetic field lines on the star. We also report on the 3-year Swift monitoring observations obtained since 2011 July. The soft X-ray spectrum remained stable during this period, and the timing behavior was noisy, with large timing residuals.</description><identifier>EISSN: 2331-8422</identifier><identifier>DOI: 10.48550/arxiv.1505.03570</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Axes of rotation ; Blackbody ; Emission spectra ; Magnetars ; Magnetic dipoles ; Magnetic flux ; Magnetism ; Magnetospheres ; Monitoring ; Outflow ; Physics - High Energy Astrophysical Phenomena ; Rotational spectra ; Soft x rays ; X-rays</subject><ispartof>arXiv.org, 2015-05</ispartof><rights>2015. This work is published under http://arxiv.org/licenses/nonexclusive-distrib/1.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><rights>http://arxiv.org/licenses/nonexclusive-distrib/1.0</rights><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>228,230,776,780,881,27902</link.rule.ids><backlink>$$Uhttps://doi.org/10.48550/arXiv.1505.03570$$DView paper in arXiv$$Hfree_for_read</backlink><backlink>$$Uhttps://doi.org/10.1088/0004-637X/807/1/93$$DView published paper (Access to full text may be restricted)$$Hfree_for_read</backlink></links><search><creatorcontrib>An, Hongjun</creatorcontrib><creatorcontrib>Archibald, Robert F</creatorcontrib><creatorcontrib>Hascoet, Romain</creatorcontrib><creatorcontrib>Kaspi, Victoria M</creatorcontrib><creatorcontrib>Beloborodov, Andrei M</creatorcontrib><creatorcontrib>Archibald, Anne M</creatorcontrib><creatorcontrib>Beardmore, Andy</creatorcontrib><creatorcontrib>Boggs, Steven E</creatorcontrib><creatorcontrib>Christensen, Finn E</creatorcontrib><creatorcontrib>Craig, William W</creatorcontrib><creatorcontrib>Gehrels, Niel</creatorcontrib><creatorcontrib>Hailey, Charles J</creatorcontrib><creatorcontrib>Harrison, Fiona A</creatorcontrib><creatorcontrib>Kennea, Jamie</creatorcontrib><creatorcontrib>Kouveliotou, Chryssa</creatorcontrib><creatorcontrib>Stern, Daniel</creatorcontrib><creatorcontrib>Younes, George</creatorcontrib><creatorcontrib>Zhang, William W</creatorcontrib><title>Deep NuSTAR and Swift Monitoring Observations of the Magnetar 1E 1841-045</title><title>arXiv.org</title><description>We report on a 350-ks NuSTAR observation of the magnetar 1E 1841-045 taken in 2013 September. During the observation, NuSTAR detected six bursts of short duration, with \(T_{90}<1\) s. An elevated level of emission tail is detected after the brightest burst, persisting for \(\sim\)1 ks. The emission showed a power-law decay with a temporal index of 0.5 before returning to the persistent emission level. The long observation also provided detailed phase-resolved spectra of the persistent X-ray emission of the source. By comparing the persistent spectrum with that previously reported, we find that the source hard-band emission has been stable over approximately 10 years. The persistent hard X-ray emission is well fitted by a coronal outflow model, where \(e^{+/-}\) pairs in the magnetosphere upscatter thermal X-rays. Our fit of phase-resolved spectra allowed us to estimate the angle between the rotational and magnetic dipole axes of the magnetar, \(\alpha_{mag}=0.25\), the twisted magnetic flux, \(2.5\times10^{26}\rm \ G\ cm^2\), and the power released in the twisted magnetosphere, \(L_j=6\times10^{36}\rm \ erg\ s^{-1}\). Assuming this model for the hard X-ray spectrum, the soft X-ray component is well fit by a two-blackbody model, with the hotter blackbody consistent with the footprint of the twisted magnetic field lines on the star. We also report on the 3-year Swift monitoring observations obtained since 2011 July. The soft X-ray spectrum remained stable during this period, and the timing behavior was noisy, with large timing residuals.</description><subject>Axes of rotation</subject><subject>Blackbody</subject><subject>Emission spectra</subject><subject>Magnetars</subject><subject>Magnetic dipoles</subject><subject>Magnetic flux</subject><subject>Magnetism</subject><subject>Magnetospheres</subject><subject>Monitoring</subject><subject>Outflow</subject><subject>Physics - High Energy Astrophysical Phenomena</subject><subject>Rotational spectra</subject><subject>Soft x rays</subject><subject>X-rays</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><sourceid>GOX</sourceid><recordid>eNotj81OAjEURhsTEwnyAK5s4nqw97a3P0uCqCQgibCfdIYWh-gMdgbUtxfB1bc5-XIOYzcghsoSiXufvqvDEEjQUEgy4oL1UErIrEK8YoO23QohUBskkj02fQhhx1_2y9Xolft6zZdfVez4vKmrrklVveGLog3p4LuqqVveRN69BT73mzp0PnGYcLAKMqHoml1G_96Gwf_22epxsho_Z7PF03Q8mmWeUGemXJMN0dnolNWknNIFGkQoNZgSgwEAh7JQonSA2oW1L4nIemFiUUaSfXZ7vj115rtUffj0k__15qfeI3F3Jnap-dyHtsu3zT7VR6cchZXKaQItfwH6NVRx</recordid><startdate>20150520</startdate><enddate>20150520</enddate><creator>An, Hongjun</creator><creator>Archibald, Robert F</creator><creator>Hascoet, Romain</creator><creator>Kaspi, Victoria M</creator><creator>Beloborodov, Andrei M</creator><creator>Archibald, Anne M</creator><creator>Beardmore, Andy</creator><creator>Boggs, Steven E</creator><creator>Christensen, Finn E</creator><creator>Craig, William W</creator><creator>Gehrels, Niel</creator><creator>Hailey, Charles J</creator><creator>Harrison, Fiona A</creator><creator>Kennea, Jamie</creator><creator>Kouveliotou, Chryssa</creator><creator>Stern, Daniel</creator><creator>Younes, George</creator><creator>Zhang, William W</creator><general>Cornell University Library, arXiv.org</general><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>L6V</scope><scope>M7S</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>GOX</scope></search><sort><creationdate>20150520</creationdate><title>Deep NuSTAR and Swift Monitoring Observations of the Magnetar 1E 1841-045</title><author>An, Hongjun ; Archibald, Robert F ; Hascoet, Romain ; Kaspi, Victoria M ; Beloborodov, Andrei M ; Archibald, Anne M ; Beardmore, Andy ; Boggs, Steven E ; Christensen, Finn E ; Craig, William W ; Gehrels, Niel ; Hailey, Charles J ; Harrison, Fiona A ; Kennea, Jamie ; Kouveliotou, Chryssa ; Stern, Daniel ; Younes, George ; Zhang, William W</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a526-7cd58ef98f948654946b27221c617c2e7111923b40c91269edac5558a07fbcf53</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>Axes of rotation</topic><topic>Blackbody</topic><topic>Emission spectra</topic><topic>Magnetars</topic><topic>Magnetic dipoles</topic><topic>Magnetic flux</topic><topic>Magnetism</topic><topic>Magnetospheres</topic><topic>Monitoring</topic><topic>Outflow</topic><topic>Physics - High Energy Astrophysical Phenomena</topic><topic>Rotational spectra</topic><topic>Soft x rays</topic><topic>X-rays</topic><toplevel>online_resources</toplevel><creatorcontrib>An, Hongjun</creatorcontrib><creatorcontrib>Archibald, Robert F</creatorcontrib><creatorcontrib>Hascoet, Romain</creatorcontrib><creatorcontrib>Kaspi, Victoria M</creatorcontrib><creatorcontrib>Beloborodov, Andrei M</creatorcontrib><creatorcontrib>Archibald, Anne M</creatorcontrib><creatorcontrib>Beardmore, Andy</creatorcontrib><creatorcontrib>Boggs, Steven E</creatorcontrib><creatorcontrib>Christensen, Finn E</creatorcontrib><creatorcontrib>Craig, William W</creatorcontrib><creatorcontrib>Gehrels, Niel</creatorcontrib><creatorcontrib>Hailey, Charles J</creatorcontrib><creatorcontrib>Harrison, Fiona A</creatorcontrib><creatorcontrib>Kennea, Jamie</creatorcontrib><creatorcontrib>Kouveliotou, Chryssa</creatorcontrib><creatorcontrib>Stern, Daniel</creatorcontrib><creatorcontrib>Younes, George</creatorcontrib><creatorcontrib>Zhang, William W</creatorcontrib><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering Collection</collection><collection>arXiv.org</collection><jtitle>arXiv.org</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>An, Hongjun</au><au>Archibald, Robert F</au><au>Hascoet, Romain</au><au>Kaspi, Victoria M</au><au>Beloborodov, Andrei M</au><au>Archibald, Anne M</au><au>Beardmore, Andy</au><au>Boggs, Steven E</au><au>Christensen, Finn E</au><au>Craig, William W</au><au>Gehrels, Niel</au><au>Hailey, Charles J</au><au>Harrison, Fiona A</au><au>Kennea, Jamie</au><au>Kouveliotou, Chryssa</au><au>Stern, Daniel</au><au>Younes, George</au><au>Zhang, William W</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Deep NuSTAR and Swift Monitoring Observations of the Magnetar 1E 1841-045</atitle><jtitle>arXiv.org</jtitle><date>2015-05-20</date><risdate>2015</risdate><eissn>2331-8422</eissn><abstract>We report on a 350-ks NuSTAR observation of the magnetar 1E 1841-045 taken in 2013 September. During the observation, NuSTAR detected six bursts of short duration, with \(T_{90}<1\) s. An elevated level of emission tail is detected after the brightest burst, persisting for \(\sim\)1 ks. The emission showed a power-law decay with a temporal index of 0.5 before returning to the persistent emission level. The long observation also provided detailed phase-resolved spectra of the persistent X-ray emission of the source. By comparing the persistent spectrum with that previously reported, we find that the source hard-band emission has been stable over approximately 10 years. The persistent hard X-ray emission is well fitted by a coronal outflow model, where \(e^{+/-}\) pairs in the magnetosphere upscatter thermal X-rays. Our fit of phase-resolved spectra allowed us to estimate the angle between the rotational and magnetic dipole axes of the magnetar, \(\alpha_{mag}=0.25\), the twisted magnetic flux, \(2.5\times10^{26}\rm \ G\ cm^2\), and the power released in the twisted magnetosphere, \(L_j=6\times10^{36}\rm \ erg\ s^{-1}\). Assuming this model for the hard X-ray spectrum, the soft X-ray component is well fit by a two-blackbody model, with the hotter blackbody consistent with the footprint of the twisted magnetic field lines on the star. We also report on the 3-year Swift monitoring observations obtained since 2011 July. The soft X-ray spectrum remained stable during this period, and the timing behavior was noisy, with large timing residuals.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><doi>10.48550/arxiv.1505.03570</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Axes of rotation Blackbody Emission spectra Magnetars Magnetic dipoles Magnetic flux Magnetism Magnetospheres Monitoring Outflow Physics - High Energy Astrophysical Phenomena Rotational spectra Soft x rays X-rays |
| title | Deep NuSTAR and Swift Monitoring Observations of the Magnetar 1E 1841-045 |
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