2008MNRAS.390..218V

Query : 2008MNRAS.390..218V

2008MNRAS.390..218V - Mon. Not. R. Astron. Soc., 390, 218-226 (2008/October-2)

Emission-line activity in type 2 quasars from the Sloan Digital Sky Survey.

VILLAR-MARTIN M., HUMPHREY A., MARTINEZ-SANSIGRE A., PEREZ-TORRES M., BINETTE L. and ZHANG X.G.

Abstract (from CDS):

We have compared the optical emission-line ratios of type 2 quasars from Zakamska et al. with standard active galactic nucleus (AGN) photoionization model predictions, type 2 Seyfert galaxies, HII galaxies and narrow-line Fanaro-Riley type II radio galaxies. Moderate to high-ionization narrow-line radio galaxies and type 2 Seyfert galaxies are indistinguishable from type 2 quasars based on their optical line ratios. The standard AGN photoionization models, widely discussed for other type 2 AGN, can reproduce successfully the loci and trends of type 2 quasars in some of the main diagnostic diagrams. These models are not exempt of problems, and the discrepancies with the data are the same encountered for other type 2 AGN. As for these, realistic models must take into account a range of cloud properties, as widely demonstrated in the literature.

The Zakamska et al. sample is strongly biased towards objects with high line luminosities (L[Oiii] >1042erg/s). We have found that stellar photoionization is obvious in a fraction of objects (3 out of 50) which are characterized by low [Oiii] luminosities compared with most type 2 quasars in the sample. We suggest that if the sample were expanded towards lower line luminosities (∼1040–42erg/s) stellar photoionization might be evident much more frequently.

We explore an alternative scenario to pure AGN photoionization in which a varying contribution of stellar ionized gas contributes to the line fluxes. Although the models presented here are rather simplistic and not strong quantitative results can be extracted regarding the relative contribution of stellar versus AGN photoionization, our results suggest that adding a varying contribution of stellar photoionized gas works in the right direction to solve most of the problems affecting the standard AGN photoionization models. The `temperature problem' on the other hand remains.


Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): galaxies: active - quasars: emission lines - quasars: general

Simbad objects: 1

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Number of rows : 1
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 Z 12-61 rG 11 42 12.253 +00 20 03.68   14.16 13.67 13.41 13.03 ~ 196 1

Query : 2008MNRAS.390..218V

Basic data :
Z 12-61 -- Radio Galaxy
Other object types: otypes_help 		G (2015ApJ,APG,...), Rad (NVSS,FIRST,...), MIR (AKARI,WISEA,...), EmO (SCHG,UM), IR (IRAS,PSCz), rG ([MMJ2002]), AGN (2019MNRAS), bCG (2013MNRAS), H2G (SHOC), AG? (2020MNRAS), Opt (SDSS)
ICRS coord. (ep=J2000) : 		11 42 12.253 +00 20 03.68 (Infrared) [ ] C 2006AJ....131.1163S
FK4 coord. (ep=B1950 eq=1950) : 		11 39 38.454 +00 36 42.43 [ ]
Gal coord. (ep=J2000) : 		268.261566 +58.466362 [ ]
Radial velocity / Redshift / cz : 		V(km/s) 5483 [~] / z(emission) 0.018460 [~] / cz 5534.17 [~]
   (IR) C 2016ApJS..226...11S
Morphological type: 		eS/lS C 2020MNRAS.491..324R
Angular size (arcmin): 		0.69088 0.426135 43 (Opt) B 2023ApJS..269....3M
Fluxes (12) :
B 14.16 [0.02] C 2013MNRAS.431..102M
V 13.67 [~] C 2013MNRAS.431..102M
R 13.41 [~] C 2013MNRAS.431..102M
I 13.03 [~] C 2013MNRAS.431..102M
J 12.302 [0.025] C 2015ApJ...810..166E
H 11.659 [0.038] C 2006AJ....131.1163S
K 11.370 [0.022] C 2015ApJ...810..166E
u (AB) 14.850 [0.003] C 2012ApJS..203...21A
g (AB) 14.331 [0.002] C 2009ApJS..182..543A
r (AB) 13.891 [0.002] C 2009ApJS..182..543A
i (AB) 13.801 [0.002] C 2009ApJS..182..543A
z (AB) 13.691 [0.003] C 2009ApJS..182..543A
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Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 1
: 1 		: 4 Display criteria :

Identifiers (34) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

NVSS J114212+002003 GLEAM J114212+002005 SCHG 1139+006 WISE J114212.35+002003.6
AKARI-IRC-V1 J1142123+002004 IRAS 11396+0036 SDSS J114212.22+002004.0 Z 12-61
APG 161 IRAS F11396+0036 SDSS J114212.25+002004.0 Z 1139.7+0037
Ark 312 LEDA 36325 SHOC 343 [DC78] UGC 6665
2dFGRS TGN377Z216 2MASX J11421225+0020036 TGSSADR J114212.3+002002 [HSN2016] J175.55+00.33
ECO 1320 MCG+00-30-019 UGC 6665 [MKR2013] J114212.33+002003.3
FIRST J114212.3+002003 Mrk 1304 UM 448 [MMJ2002] 292858
GAMA 609396 PSCz Q11396+0036 UZC J114212.3+002003
GAMA J114212.22+002004.0 RESOLVE rs547 WISEA J114212.34+002003.6

References (196 between 1850 and 2026) (Total 196)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements Description of Measurements

Velocities : 18    Distance : 3   

   

Observing logs
Herschel : 8   

   

External archives :

Data at NED - NASA/IPAC Extragalactic Database : Z 12-61

Link by name to the catalogue in VizieR :

NVSS J114212+002003 AKARI-IRC-V1 J1142123+002004 APG 161 2dFGRS TGN377Z216 FIRST J114212.3+002003
IRAS 11396+0036 IRAS F11396+0036 2MASX J11421225+0020036 SDSS J114212.22+002004.0 SDSS J114212.25+002004.0
UGC 6665 UM 448 WISEA J114212.34+002003.6 WISE J114212.35+002003.6

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