J/MNRAS/351/83 Blazars equivalent widths and radio luminosity (Landt+, 2004)
A physical classification scheme for blazars.
Landt H., Padovani P., Perlman E.S., Giommi P.
<Mon. Not. R. Astron. Soc., 351, 83-100 (2004)>
=2004MNRAS.351...83L 2004MNRAS.351...83L
ADC_Keywords: QSOs ; BL Lac objects ; Radio sources ; Equivalent widths
Keywords: galaxies: active - BL Lacertae objects: general -
quasars: emission lines
Abstract:
Blazars are currently separated into BL Lacertae objects (BL Lacs) and
flat spectrum radio quasars based on the strength of their emission
lines. This is performed rather arbitrarily by defining a diagonal
line in the Ca H&K break value-equivalent width plane, following
Marcha et al. (1996MNRAS.281..425M 1996MNRAS.281..425M). We readdress this problem and put
the classification scheme for blazars on firm physical grounds. We
study ∼100 blazars and radio galaxies from the Deep X-ray Radio Blazar
Survey (DXRBS, Cat. J/AJ/115/1253 and J/MNRAS/323/757) and 2-Jy
radio survey and find a significant bimodality for the narrow emission
line [OIII]λ5007. This suggests the presence of two physically
distinct classes of radio-loud active galactic nuclei (AGN). We show
that all radio-loud AGN, blazars and radio galaxies, can be
effectively separated into weak- and strong-lined sources using the
[OIII]λ5007-[OII]λ3727 equivalent width plane. This
plane allows one to disentangle orientation effects from intrinsic
variations in radio-loud AGN. Based on DXRBS, the strongly beamed
sources of the new class of weak-lined radio-loud AGN are made up of
BL Lacs at the ∼75 per cent level, whereas those of the strong-lined
radio-loud AGN include mostly (∼97 per cent) quasars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 122 24 DXRBS BL Lacs
table2.dat 122 105 DXRBS Flat Spectrum Radio Quasars FSRQ, z≤2.2
table3.dat 122 34 DXRBS Steep Spectrum Radio Quasars (SSRQ), z≤1.2
table4.dat 66 10 DXRBS radio galaxies
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See also:
IX/31 : The WGACAT version of ROSAT sources (White+ 2000)
VIII/52 : The MIT-Green Bank 5GHz Survey (Bennett+, 1986-91)
VIII/38 : The Parkes-MIT-NRAO 4.85GHz (PMN) Surveys (Griffith+ 1993-96)
III/175 : Optical spectroscopy of radio sources (Stickel+, 1989-94)
J/AJ/115/1253 : Deep X-Ray Radio Blazar Survey (DXRBS). I. (Perlman+ 1998)
J/MNRAS/323/757 : Deep X-Ray Radio Blazar Survey (DXRBS). II. (Landt+, 2001)
Byte-by-byte Description of file: table1.dat table2.dat table3.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name Object name (G1)
18- 20 A3 --- r_Name Reference for emission-line data (2)
22- 26 F5.3 --- z Redshift
28 A1 --- l_EWMgII Limit flag on EWMgII
29- 33 F5.1 0.1nm EWMgII ? MgIIλ2798 Rest frame equivalent
width
35 A1 --- l_logLMgII Limit flag on logLMgII
36- 40 F5.2 [10-7W] logLMgII ? MgIIλ2798 line luminosity
41 A1 --- n_logLMgII [*] Note on logLMgII (3)
42 A1 --- l_EW[OII] Limit flag on EW[OII]
43- 47 F5.1 0.1nm EW[OII] ? [O II]λ3727 rest frame equivalent
width
49 A1 --- l_logL[OII] Limit flag on logL[OII]
50- 54 F5.2 [10-7W] logL[OII] ? [O II]λ3727 line luminosity
56 A1 --- l_EWHb Limit flag on EWHb
57- 61 F5.1 0.1nm EWHb ? Hβλ4861 rest frame equivalent
width
63 A1 --- l_logLHb Limit flag on logLHb
64- 68 F5.2 [10-7W] logLHb ? Hβλ4861 line luminosity
70 A1 --- l_EW[OIII] Limit flag on EW[OIII]
71- 75 F5.1 0.1nm EW[OIII] ? [O III]λ5007 rest frame equivalent
width
77 A1 --- l_logL[OIII] Limit flag on logL[OIII]
78- 82 F5.2 [10-7W] logL[OIII] ? [O III]λ5007 line luminosity
84 A1 --- l_EWHa Limit flag on EWHa
85- 89 F5.1 0.1nm EWHa ? Hαλ6563 rest frame equivalent
width
91 A1 --- l_logLHa Limit flag on logLHa
92- 96 F5.2 [10-7W] logLHa ? Hαλ6563 line luminosity
98 A1 --- l_LNLR Limit flag on LNLR
99-103 F5.2 [10-7W] LNLR ? Narrow-line region luminosity (G2)
106 A1 --- l_LBLR Limit flag on LBLR
107-111 F5.2 [10-7W] LBLR ? Broad-line region luminosity (G2)
112 A1 --- n_LBLR [*] Note on LBLR (3)
114-117 F4.2 --- CaH+K ? CaH&K break value (G3)
119-122 F4.2 --- e_CaH+K ? rms uncertainty on CaH&K
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Note (2): References for emission-line data are as follows:
a = Baldwin, Wampler, & Gaskell (1989ApJ...338..630B 1989ApJ...338..630B)
b = Richstone & Schmidt (1980ApJ...235..361R 1980ApJ...235..361R)
c = Jackson & Browne (1991MNRAS.250..414J 1991MNRAS.250..414J)
d = Stickel, Kuehr & Fried (1993A&AS...97..483S 1993A&AS...97..483S, Cat. III/175)
e = Lawrence et al. (1996ApJS..107..541L 1996ApJS..107..541L)
f = Stickel, Fried & Kuehr (1989A&AS...80..103S 1989A&AS...80..103S, Cat. III/175)
g = Jackson & Eracleous (1995MNRAS.276.1409J 1995MNRAS.276.1409J)
h = Stickel & Kuehr (1993A&AS..100..395S 1993A&AS..100..395S, Cat. III/75)
j = Wilkes (1986MNRAS.218..331W 1986MNRAS.218..331W)
Note (3): *: Lower limit since flux loss due to atmospheric differential
refraction >30 per cent.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name Object Name (G1)
19- 23 F5.3 --- z Redshift
25 A1 --- l_EW[OII] Limit flag on EW[OII]
26- 29 F4.1 0.1nm EW[OII] ? [O II] rest frame equivalent width
31 A1 --- l_logL[OII] Limit flag on logL[OII]
32- 36 F5.2 [10-7W] logL[OII] ? [O II] line luminosity
38 A1 --- l_EW[OIII] Limit flag on EW[OIII]
39- 42 F4.1 0.1nm EW[OIII] ? [O III] rest frame equivalent width
44 A1 --- l_logL[OIII] Limit flag on logL[OIII]
45- 49 F5.2 [10-7W] logL[OIII] ? [O III] line luminosity
51 A1 --- l_LNLR Limit flag on LNLR
52- 56 F5.2 [10-7W] LNLR Narrow-line region luminosity
58- 61 F4.2 --- CaH+K ? CaH&K break value (G3)
63- 66 F4.2 --- e_CaH+K ? rms uncertainty on CaH&K
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Global Notes:
Note (G1): Names have been standardized at CDS,
e.g. WGAJ was replaced by 1 WGA J.
In table4, the name J1229.4+2711 was replaced by J1229.5+2711
Note (G2): Narrow-line region defined by Rawlings and Saunders
(1991Natur.349..138R 1991Natur.349..138R) as 3.*(3logL[OII] + 1.5logL[OIII]).
The broad-line region (BLR) luminosity is the sum of measured
luminosities in the observed broad lines, calculated following
Celotti, Padovani & Ghisellini (1997MNRAS.286..415C 1997MNRAS.286..415C)
Note (G3): the CaH&K break value is the relative difference of fluxes
in the blue and red parts of the line (f+-f-)/f+
History:
From electronic version of the journal -- with one modification
in table4 (see "Note (G1)" above)
(End) Patricia Vannier [CDS] 19-Jul-2004