|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'501'711
Articles rated: 2609
19 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
NuSTAR Spectroscopy of Multi-Component X-ray Reflection from NGC 1068 | | Franz E. Bauer
; Patricia Arevalo
; Dominic J. Walton
; Michael J. Koss
; Simonetta Puccetti
; Poshak Gandhi
; Daniel Stern
; David M. Alexander
; Mislav Balokovic
; Steve E. Boggs
; William N. Brandt
; Murray Brightman
; Finn E. Christensen
; Andrea Comastri
; William W. Craig
; Agnese Del Moro
; Charles J. Hailey
; Fiona A. Harrison
; Ryan Hickox
; Bin Luo
; Craig B. Markwardt
; Andrea Marinucci
; Giorgio Matt
; Jane R. Rigby
; Elizabeth Rivers
; Cristian Saez
; Ezequiel Treister
; C. Megan Urry
; William W. Zhang
; | | Date: |
3 Nov 2014 | | Abstract: | We report on observations of NGC1068 with NuSTAR, which provide the best
constraints to date on its $>10$~keV spectral shape. We find no strong
variability over the past two decades, consistent with its Compton-thick AGN
classification. The combined NuSTAR, Chandra, XMM-Newton, and Swift-BAT
spectral dataset offers new insights into the complex reflected emission. The
critical combination of the high signal-to-noise NuSTAR data and a spatial
decomposition with Chandra allow us to break several model degeneracies and
greatly aid physical interpretation. When modeled as a monolithic (i.e., a
single N_H) reflector, none of the common Compton-reflection models are able to
match the neutral fluorescence lines and broad spectral shape of the Compton
reflection. A multi-component reflector with three distinct column densities
(e.g., N_H~1.5e23, 5e24, and 1e25 cm^{-2}) provides a more reasonable fit to
the spectral lines and Compton hump, with near-solar Fe abundances. In this
model, the higher N_H components provide the bulk of the Compton hump flux
while the lower N_H component produces much of the line emission, effectively
decoupling two key features of Compton reflection. We note that ~30% of the
neutral Fe Kalpha line flux arises from >2" (~140 pc), implying that a
significant fraction of the <10 keV reflected component arises from regions
well outside of a parsec-scale torus. These results likely have ramifications
for the interpretation of poorer signal-to-noise observations and/or more
distant objects [Abridged]. | | Source: | arXiv, 1411.0670 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER