2013A&A...551A..95R


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST15:48:54

2013A&A...551A..95R - Astronomy and Astrophysics, volume 551A, 95-95 (2013/3-1)

Chandra LETGS observation of the variable NLS1 galaxy Ark 564.

RAMIREZ J.M.

Abstract (from CDS):

We present an analysis of the 100 ks X-ray spectrum of the narrow-line Seyfert 1 Galaxy Ark 564, taken with the Low Energy Transmission Grating Spectrometer (LETGS) on board Chandra. Using χ2 statistics, several continuum models of the time-averaged spectrum of this object are compared, obtaining a semi-empirical solution for the description of the intrinsic emission continuum and a physical solution for the intrinsic absorption of the system. We find that the 0.1-10 keV spectrum can be well described by a power law plus two thermal components that account for the soft step. We are also able to detect and measure several narrow, unresolved absorption lines arising from highly ionized species of C, N, O, and Fe. The material seems to have a velocity consistent with the systemic velocity of the galaxy. This piece of evidence, in addition to the very low observed column density of NH∼1020cm–2, is in good agreement with the scenario of a transverse biconical outflow with a gas density of n≲3x1012cm–3 at distances beyond the broad-line region r>10lt-days, but a dust torus origin cannot be ruled out.

Abstract Copyright:

Journal keyword(s): galaxies: Seyfert - line: identification - quasars: absorption lines

VizieR on-line data: <Available at CDS (J/A+A/551/A95): spectrum.dat>

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 985 Sy1 02 34 37.882 -08 47 17.02   14.64 14.28 12.9   ~ 348 0
2 QSO J0831+5245 QSO 08 31 41.7095363198 +52 45 17.620340544   19.2   14.5 13.9 ~ 493 1
3 Mrk 421 BLL 11 04 27.3139210166 +38 12 31.798324828   13.50 12.90 8.31   ~ 2403 1
4 NGC 3783 Sy1 11 39 01.7095761008 -37 44 19.008597647   12.46 13.43 11.33 12.1 ~ 1492 0
5 NGC 4051 Sy1 12 03 09.6098828919 +44 31 52.693714606   11.08 12.92 9.94   ~ 2007 1
6 ESO 383-35 Sy1 13 35 53.7686909139 -34 17 44.139127597   13.89 13.61 8.9   ~ 1386 0
7 Mrk 279 Sy1 13 53 03.4356451470 +69 18 29.410672989   15.15 14.46     ~ 697 0
8 UGC 12163 Sy1 22 42 39.3364258078 +29 43 31.301194419   14.86 14.16     ~ 620 1
9 NAME MR 2251-178 Sy1 22 54 05.8858021308 -17 34 55.403006841   14.99 14.36 15.12   ~ 378 3

    Equat.    Gal    SGal    Ecl

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2020.10.21-15:48:54

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