J/A+A/596/A95 Spectral nuclear properties of NLS1 galaxies (Schmidt+, 2016)
Spectral nuclear properties of NLS1 galaxies.
Schmidt E.O., Ferreiro D., Vega Neme L., Oio G.A.
<Astron. Astrophys. 596, A95 (2016)>
=2016A&A...596A..95S 2016A&A...596A..95S (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Spectroscopy
Keywords: galaxies: active - galaxies: Seyfert - galaxies: nuclei -
galaxies: kinematics and dynamics
Abstract:
It is not yet well known whether narrow line Seyfert 1 (NLS1) galaxies
follow the MBH-σ* relation found for normal galaxies.
Emission lines, such as [SII] or [OIII]λ5007, have been used as
a surrogate of the stellar velocity dispersion and various results
have been obtained. On the other hand, some active galactic nuclei
(AGNs) have shown Balmer emission with an additional intermediate
component (IC) besides the well-known narrow and broad lines. The
properties of this IC have not yet been fully studied.
In order to re-examine the location of NLS1 in the MBH-σ*
relation, we test some emission lines, such as the narrow component
(NC) of Hα and the forbidden [NII]λλ6548,6584 and
[SII]λλ6716,6731 lines, as replacements for σ*.
On the other hand, we study the properties of the IC of Hα found
in 14 galaxies of the sample to find a link between this component,
the central engine, and the remaining lines. We also compare the
emission among the broad component (BC) of Hα and those emitted
at the narrow line region (NLR) to detect differences in the ionizing
source in each emitting region.
We have obtained and studied medium-resolution spectra (170km/s FWHM
at Hα) of 36 NLS1 galaxies in the optical range ∼5800-6800Å.
We performed a Gaussian decomposition of the
Hα+[NII]λλ6548,6584 profile to study the distinct
components of Hα and [NII] lines. We also measured the [SII]
lines.
We obtained black hole (BH) masses in the range
log(M{BH}/M☉)=5.4-7.5 for our sample. We found that, in
general, most of the galaxies lie below the MBH-σ* relation
when the NC of Hα and [NII] lines are used as a surrogate of
σ*. The objects are closer to the relation when [SII] lines
are used. Nevertheless, the galaxies are still below this relation and
we do not see a clear correlation between the BH masses and
FWHM[SII]. Besides this, we found that 13 galaxies show an IC, most
of which are in the velocity range ∼700-1500km/s. This is same range
as in AGN types and is well correlated with the FWHM of BC and,
therefore, with the BH mass. On the other hand, we found that there is
a correlation between the luminosity of the BC of Hα and NC, IC,
[NII]λ6584, and [SII] lines.
Description:
36 optical spectra of narrow line Seyfert 1 galaxies. Data were taken
using the CASLEO 2.15m. telescope and using the 600line/mm grating
giving a resolution of 170km/s FWHM around Hα. The observations
cover the spectral range from 5800Å to 6800Å.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 105 36 Observed galaxies
fits/* . 36 Individual fits spectra
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- Name Galaxy name
26- 27 I2 h RAh Right ascension (J2000.0)
29- 30 I2 min RAm Right ascension (J2000.0)
32- 35 F4.1 s RAs Right ascension (J2000.0)
37 A1 --- DE- Declination sign (J2000.0)
38- 39 I2 deg DEd Declination (J2000.0)
41- 42 I2 arcmin DEm Declination (J2000.0)
44- 45 I2 arcsec DEs Declination (J2000.0)
47- 50 F4.1 --- Bmag Apparent B magnitude
52- 58 F7.5 --- z Redshift
60- 69 A10 "date" Obs.Date Date of observation
71- 76 A6 --- ExpTime Number of exposures x time of each exposure
78-105 A28 --- FileName Name of the fit file in subdirectory fits
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Acknowledgements:
Eduardo Schmidt, eduschmidt(at)oac.unc.edu.ar
(End) Patricia Vannier [CDS] 12-Dec-2016