2006ApJ...637..147P


Query : 2006ApJ...637..147P

2006ApJ...637..147P - Astrophys. J., 637, 147-156 (2006/January-3)

Type II quasars from the Sloan Digital Sky Survey. IV. Chandra and XMM-Newton observations reveal heavily absorbed sources.

PTAK A., ZAKAMSKA N.L., STRAUSS M.A., KROLIK J.H., HECKMAN T.M., SCHNEIDER D.P. and BRINKMANN J.

Abstract (from CDS):

We are carrying out sensitive X-ray observations with Chandra and XMM-Newton of type II quasars selected from the Sloan Digital Sky Survey based on their optical emission line properties. In this paper we present the first results of our program. We present observations of four objects at redshifts 0.4<z<0.8, and an analysis of the archival data for four additional objects in the same redshift range. Six of the eight were detected in X-rays; five of them have sufficient signal to derive spectral information. All of the detected sources have intrinsic luminosities L2–10keV>5x1043ergs/s ; the five with sufficient counts for spectral fitting show evidence for significant absorption (NH≳ a fewx1022/cm2). At least three of the objects likely have NH>1023/cm2; some may be Compton-thick (NH>1024/cm2). In the five objects for which we could fit spectra, the slopes tend to be significantly flatter than typically observed in AGNs; it is possible that this is due either to reprocessing of the nuclear emission or to a line of sight that passes through patchy absorption.

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Journal keyword(s): Galaxies: Active - Galaxies: Quasars: General - X-Rays

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026
#notes
1 ACO 168 ClG 01 15 07.58 +00 19 10.8           ~ 379 2
2 2MASS J01152218+0015187 Sy2 01 15 22.1892371760 +00 15 18.585756864     21.48     ~ 15 0
3 2XMM J021047.0-100152 Sy2 02 10 47.0026336728 -10 01 53.014352664   21.30 20.78     ~ 28 0
4 M 77 Sy2 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4897 2
5 SDSS J024309.79+000640.3 Sy2 02 43 09.788 +00 06 40.34     21.07     ~ 10 0
6 [VV2010c] J080154.2+441233 Sy2 08 01 54.2551 +44 12 33.863   21.75 21.38     ~ 19 0
7 LIRAS J084234.94+362503.2 Sy2 08 42 34.9476759744 +36 25 03.133827336   20.95 20.51     ~ 29 0
8 IRAS 09104+4109 Sy2 09 13 45.4951283928 +40 56 28.215343572   19.69 19.21     ~ 260 1
9 2XMM J122656.4+013124 Sy2 12 26 56.4794393928 +01 31 24.288763800   21.37 20.72     ~ 40 0
10 NAME DW 1225+0152 LSB 12 27 46.1 +01 36 01 15.45 16.02 15.92 15.73   ~ 47 0
11 2QZ J123215.8+020609 Sy2 12 32 15.8195629248 +02 06 10.080931392   20.95 20.56     ~ 18 0
12 2XMM J164131.6+385841 Sy2 16 41 31.723 +38 58 40.92   20.96 20.40     ~ 27 0

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