J/ApJ/590/73 RASS AGN sample. II. (Xu+, 2003)
An active galactic nucleus sample with high X-Ray-to-Optical flux ratio from
RASS.
II. Optical emission line properties of Seyfert 1-Type active galactic nuclei.
Xu D.W., Komossa S., Wei J.Y., Qian Y., Zheng X.Z.
<Astrophys. J. 590, 73 (2003)>
=2003ApJ...590...73X 2003ApJ...590...73X
ADC_Keywords: X-ray sources ; Active gal. nuclei ; Spectroscopy ; Redshifts
Keywords: galaxies: Seyfert - quasars: emission lines - X-rays: galaxies
Abstract:
This work studies the optical emission line properties of a sample of
155 low-redshift bright X-ray-selected ROSAT Seyfert 1-type active
galactic nuclei for which adequate signal-to-noise ratio spectroscopic
observations are available. We measured emission-line properties by
performing multicomponent fits to the emission-line profiles, covering
the effect of blended iron emission. We also obtained continuum
parameters, including 250eV X-ray luminosities derived from the ROSAT
database. In addition, the measured properties are gathered for a
correlation analysis, which confirms the well-known relations between
the strengths of Fe II, [O III] emission and the X-ray slope. We also
detect striking correlations between Hβ redshift (or blueshift)
and flux ratios of Fe II to Hβ broad component and [O III] to
Hβ narrow component. These trends are most likely driven by the
Eddington ratio.
Description:
The known sources, as well as sources without high-quality
observations in the identification campaign, were investigated during
several observing runs performed from 1998 November through 2000
December. The low-resolution spectra were taken with the NAOC 2.16m
telescope and the OMR spectrograph, using a Tektronix 1024x1024 CCD as
detector.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 112 155 Properties of the Seyfert 1-Type AGN Sample
--------------------------------------------------------------------------------
See also:
J/A+AS/139/575 : RASS AGN sample. I. (Wei+, 1999)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 21 A21 --- Name Source name
22 A1 --- n_Name [dfg] Note on Name (1)
24- 28 F5.3 --- z Redshift
30- 33 I4 km/s WHBb ? Full-Widht at Half-Maximum of
broad Hβ component
34 A1 --- n_WHBb [e] based on the Hα measurement
36- 39 I4 km/s WHBn ? Full-Widht at Half-Maximum of
narrow Hβ component
40 A1 --- n_WHBn [e] based on the Hα measurement
42- 45 I4 km/s W[OIII] ? Full-Widht at Half-Maximum of [O III]
47- 51 F5.1 0.1nm EWHBb ? Local equivalent width of broad Hβ
53- 57 F5.1 0.1nm EWFeII ? Local equivalent width of Fe II
58 A1 --- l_EW[OIII] Limit flag on EW[OIII]
59- 63 F5.1 0.1nm EW[OIII] ? Local equivalent width of [O III]
64 A1 --- l_[OIII]/HBb Limit flag on [OIII]/HBb
65- 68 F4.1 --- [OIII]/HBb ? Ratio of fluxes of [O III] to
broad Hβ
70- 73 F4.1 --- [OIII]/HBn ? Ratio of fluxes of [O III] to
narrow Hβ
75- 77 F3.1 --- FeII/HBb ? Ratio of fluxes of Fe II to broad Hβ
79- 82 I4 km/s DeltaV1 ? Hβ broad component velocity shift
with respect to narrow component (3)
84- 87 I4 km/s DeltaV2 ? Hβ broad component velocity shift
relative to the systemic frame (4)
89- 92 I4 km/s DeltaV3 ? Hβ narrow component velocity shift
relative to the systemic frame (5)
94- 97 F4.1 --- SpIO ? Optical spectral index
99-102 F4.2 --- SpIX ? X-ray spectral index
104-107 F4.2 --- e_SpIX ? rms uncertainty on Sp+IndexX
109-112 F4.1 10-7W log(nuL1/4) ? Monochromatic 250eV luminosity
--------------------------------------------------------------------------------
Note (1): Notes on Name as follows:
d = Hβ is weak
f = Sources show obvious asymmetric
[O III] λλ4959,5007 profiles
Note (3): A positive velocity indicates a redshift of Hβ broad component
with respect to narrow component, whereas a negative velocity refers
to a blueshift
Note (4): A positive velocity corresponds to a redward shift of Hβ broad
component with respect to systemic, while a negative velocity
represents a blueshift.
Note (5): A positive velocity corresponds to a redward shift of Hβ narrow
component with respect to systemic, while a negative velocity
represents a blueshift.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 26-Sep-2003