CaltechAUTHORS
  A Caltech Library Service

Probing magnetar emission mechanisms with X-ray spectropolarimetry

Caiazzo, Ilaria and González-Caniulef, Denis and Heyl, Jeremy and Fernández, Rodrigo (2022) Probing magnetar emission mechanisms with X-ray spectropolarimetry. Monthly Notices of the Royal Astronomical Society, 514 (4). pp. 5024-5034. ISSN 0035-8711. doi:10.1093/mnras/stac1571. https://resolver.caltech.edu/CaltechAUTHORS:20220729-894420000

[img] PDF - Published Version
See Usage Policy.

1MB
[img] PDF - Submitted Version
See Usage Policy.

1MB

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20220729-894420000

Abstract

This year, a new era of observations of compact objects in X-ray polarization is commencing. Among the key targets for the Imaging X-ray Polarimetry Explorer mission are the magnetars 4U 0142+61 and 1RXS J170849.0-400910. Here, we present detailed predictions of the expected polarization from these sources that incorporate realistic models of emission physics at the surface (gaseous or condensed), the temperature distribution on the surface, general relativity, quantum electrodynamics, and scattering in the magnetosphere, accounting for the broad-band spectral energy distribution from below 1 keV to nearly 100 keV. We find that either atmospheres or condensed surfaces can account for the emission at a few keV. In both cases, either a small hot polar cap or scattering is required to account for the emission at 5–10 keV and, above 10 keV, scattering by a hard population of electrons can account for the rising power in the hard X-rays observed in many magnetars in quiescence. Although these different scenarios result in very similar spectral energy distributions, they generate dramatically different polarization signatures from 2 to 8 keV, which is the range of sensitivity of the Imaging X-ray Polarimetry Explorer. Observations of these sources in X-ray polarization will therefore probe the emission from magnetars in an essentially new way.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1093/mnras/stac1571DOIArticle
https://arxiv.org/abs/2112.03401arXivDiscussion Paper
ORCID:
AuthorORCID
Caiazzo, Ilaria0000-0002-4770-5388
Heyl, Jeremy0000-0001-9739-367X
Fernández, Rodrigo0000-0003-4619-339X
Alternate Title:Probing magnetar emission mechanisms with spectropolarimetry
Additional Information:© 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model) Received: 16 January 2022. Revision received: 31 May 2022. Accepted: 31 May 2022. Published: 09 June 2022. Corrected and typeset: 07 July 2022. The authors are thankful to Silvia Zane for her thoughtful comments on the manuscript. This work was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC), [funding reference #CITA 490888-16]. IC is a Sherman Fairchild Fellow at Caltech and thanks the Burke Institute at Caltech for supporting her research. RF acknowledges support from the Natural Sciences and Engineering Research Council of Canada (NSERC) through Discovery Grant RGPIN-2017-04286. This research was enabled in part by support provided Compute Canada (www.computecanada.ca), UBC ARC Sockeye infrastructure, and the SciServer science platform (www.sciserver.org). DATA AVAILABILITY. Upon request, the corresponding author will provide the software to reproduce the simulations performed in this work.
Group:TAPIR, Walter Burke Institute for Theoretical Physics
Funders:
Funding AgencyGrant Number
Natural Sciences and Engineering Research Council of Canada (NSERC)CITA 490888-16
Sherman Fairchild FoundationUNSPECIFIED
Walter Burke Institute for Theoretical Physics, CaltechUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)RGPIN-2017-04286
Compute CanadaUNSPECIFIED
Subject Keywords:plasmas, polarization, scattering, stars: individual: 4U 0142+61, 1RXS J170849.0-400910, stars: magnetars, X-rays: star
Issue or Number:4
DOI:10.1093/mnras/stac1571
Record Number:CaltechAUTHORS:20220729-894420000
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20220729-894420000
Official Citation:Ilaria Caiazzo, Denis González-Caniulef, Jeremy Heyl, Rodrigo Fernández, Probing magnetar emission mechanisms with X-ray spectropolarimetry, Monthly Notices of the Royal Astronomical Society, Volume 514, Issue 4, August 2022, Pages 5024–5034, https://doi.org/10.1093/mnras/stac1571
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115979
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:01 Aug 2022 20:03
Last Modified:01 Aug 2022 20:03

Repository Staff Only: item control page