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Title: Dust Radiative Transfer Modeling of the Infrared Ring around the Magnetar SGR 1900+14

Abstract

A peculiar infrared ring-like structure was discovered by Spitzer around the strongly magnetized neutron star SGR 1900+14. This infrared (IR) structure was suggested to be due to a dust-free cavity, produced by the Soft Gamma-ray Repeaters (SGRs) Giant Flare occurring in 1998, and kept illuminated by surrounding stars. Using a 3D dust radiative transfer code, we aimed to reproduce the emission morphology and the integrated emission flux of this structure assuming different spatial distributions and densities for the dust, and different positions for the illuminating stars. We found that a dust-free ellipsoidal cavity can reproduce the shape, flux, and spectrum of the ring-like IR emission, provided that the illuminating stars are inside the cavity and that the interstellar medium has high gas density ( n {sub H} ∼ 1000 cm{sup −3}). We further constrain the emitting region to have a sharp inner boundary and to be significantly extended in the radial direction, possibly even just a cavity in a smooth molecular cloud. We discuss possible scenarios for the formation of the dustless cavity and the particular geometry that allows it to be IR-bright.

Authors:
 [1]; ; ;  [2];  [3];  [4]
  1. Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE (United Kingdom)
  2. Institute of Space Sciences (IEEC–CSIC), Campus UAB, Carrer de Can Magrans S/N, E-08193 Barcelona (Spain)
  3. Department of Physics, Oregon State University, 301 Weniger Hall, Corvallis, OR 97331 (United States)
  4. Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794 (United States)
Publication Date:
OSTI Identifier:
22661343
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 837; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DENSITY; DUSTS; EMISSION; GAMMA RADIATION; NEUTRON STARS; RADIANT HEAT TRANSFER; RINGS; SIMULATION; SPATIAL DISTRIBUTION; SPECTRA; X RADIATION

Citation Formats

Natale, G., Rea, N., Torres, D. F., Girart, J. M., Lazzati, D., and Perna, R., E-mail: gnatale@uclan.ac.uk. Dust Radiative Transfer Modeling of the Infrared Ring around the Magnetar SGR 1900+14. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA5C82.
Natale, G., Rea, N., Torres, D. F., Girart, J. M., Lazzati, D., & Perna, R., E-mail: gnatale@uclan.ac.uk. Dust Radiative Transfer Modeling of the Infrared Ring around the Magnetar SGR 1900+14. United States. doi:10.3847/1538-4357/AA5C82.
Natale, G., Rea, N., Torres, D. F., Girart, J. M., Lazzati, D., and Perna, R., E-mail: gnatale@uclan.ac.uk. Wed . "Dust Radiative Transfer Modeling of the Infrared Ring around the Magnetar SGR 1900+14". United States. doi:10.3847/1538-4357/AA5C82.
@article{osti_22661343,
title = {Dust Radiative Transfer Modeling of the Infrared Ring around the Magnetar SGR 1900+14},
author = {Natale, G. and Rea, N. and Torres, D. F. and Girart, J. M. and Lazzati, D. and Perna, R., E-mail: gnatale@uclan.ac.uk},
abstractNote = {A peculiar infrared ring-like structure was discovered by Spitzer around the strongly magnetized neutron star SGR 1900+14. This infrared (IR) structure was suggested to be due to a dust-free cavity, produced by the Soft Gamma-ray Repeaters (SGRs) Giant Flare occurring in 1998, and kept illuminated by surrounding stars. Using a 3D dust radiative transfer code, we aimed to reproduce the emission morphology and the integrated emission flux of this structure assuming different spatial distributions and densities for the dust, and different positions for the illuminating stars. We found that a dust-free ellipsoidal cavity can reproduce the shape, flux, and spectrum of the ring-like IR emission, provided that the illuminating stars are inside the cavity and that the interstellar medium has high gas density ( n {sub H} ∼ 1000 cm{sup −3}). We further constrain the emitting region to have a sharp inner boundary and to be significantly extended in the radial direction, possibly even just a cavity in a smooth molecular cloud. We discuss possible scenarios for the formation of the dustless cavity and the particular geometry that allows it to be IR-bright.},
doi = {10.3847/1538-4357/AA5C82},
journal = {Astrophysical Journal},
number = 1,
volume = 837,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}
}