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Title: ABSORPTION MEASURE DISTRIBUTION IN Mrk 509

Abstract

In this paper we model the observed absorption measure distribution (AMD) in Mrk 509, which spans three orders of magnitude in ionization level with a single-zone absorber in pressure equilibrium. AMD is usually constructed from observations of narrow absorption lines in radio-quiet active galaxies with warm absorbers. We study the properties of the warm absorber in Mrk 509 using recently published broadband spectral energy distribution observed with different instruments. This spectrum is an input in radiative transfer computations with full photoionization treatment using the titan code. We show that the simplest way to fully reproduce the shape of AMD is to assume that the warm absorber is a single zone under constant total pressure. With this assumption, we found theoretical AMD that matches the observed AMD determined on the basis of the 600 ks reflection grating spectrometer XMM-Newton spectrum of Mrk 509. The softness of the source spectrum and the important role of the free–free emission breaks the usual degeneracy in the ionization state calculations, and the explicit dependence of the depths of AMD dips on density open a new path to the density diagnostic for the warm absorber. In Mrk 509, the implied density is of the order of 10{sup 8}more » cm{sup −3}.« less

Authors:
; ;  [1];  [2]
  1. Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, 00-716, Warsaw (Poland)
  2. Center for Theoretical Physics, Polish Academy of Sciences, Al. Lotnikow 32/46 02-668, Warsaw (Poland)
Publication Date:
OSTI Identifier:
22521769
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 815; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION SPECTRA; CALCULATION METHODS; DENSITY; EMISSION SPECTRA; ENERGY SPECTRA; EQUILIBRIUM; GALAXIES; PHOTOIONIZATION; RADIANT HEAT TRANSFER; REFLECTION

Citation Formats

Adhikari, T. P., Różańska, A., Sobolewska, M., and Czerny, B., E-mail: tek@camk.edu.pl. ABSORPTION MEASURE DISTRIBUTION IN Mrk 509. United States: N. p., 2015. Web. doi:10.1088/0004-637X/815/2/83.
Adhikari, T. P., Różańska, A., Sobolewska, M., & Czerny, B., E-mail: tek@camk.edu.pl. ABSORPTION MEASURE DISTRIBUTION IN Mrk 509. United States. doi:10.1088/0004-637X/815/2/83.
Adhikari, T. P., Różańska, A., Sobolewska, M., and Czerny, B., E-mail: tek@camk.edu.pl. Sun . "ABSORPTION MEASURE DISTRIBUTION IN Mrk 509". United States. doi:10.1088/0004-637X/815/2/83.
@article{osti_22521769,
title = {ABSORPTION MEASURE DISTRIBUTION IN Mrk 509},
author = {Adhikari, T. P. and Różańska, A. and Sobolewska, M. and Czerny, B., E-mail: tek@camk.edu.pl},
abstractNote = {In this paper we model the observed absorption measure distribution (AMD) in Mrk 509, which spans three orders of magnitude in ionization level with a single-zone absorber in pressure equilibrium. AMD is usually constructed from observations of narrow absorption lines in radio-quiet active galaxies with warm absorbers. We study the properties of the warm absorber in Mrk 509 using recently published broadband spectral energy distribution observed with different instruments. This spectrum is an input in radiative transfer computations with full photoionization treatment using the titan code. We show that the simplest way to fully reproduce the shape of AMD is to assume that the warm absorber is a single zone under constant total pressure. With this assumption, we found theoretical AMD that matches the observed AMD determined on the basis of the 600 ks reflection grating spectrometer XMM-Newton spectrum of Mrk 509. The softness of the source spectrum and the important role of the free–free emission breaks the usual degeneracy in the ionization state calculations, and the explicit dependence of the depths of AMD dips on density open a new path to the density diagnostic for the warm absorber. In Mrk 509, the implied density is of the order of 10{sup 8} cm{sup −3}.},
doi = {10.1088/0004-637X/815/2/83},
journal = {Astrophysical Journal},
number = 2,
volume = 815,
place = {United States},
year = {Sun Dec 20 00:00:00 EST 2015},
month = {Sun Dec 20 00:00:00 EST 2015}
}