J/A+A/560/A99 NIR long-slit spectra of Seyfert galaxies (van der Laan+, 2013)
Near-infrared long-slit spectra of Seyfert galaxies:
gas excitation across the central kiloparsec.
van der Laan T.P.R., Schinnerer E., Boeker T., Armus L.
<Astron. Astrophys. 560, A99 (2013)>
=2013A&A...560A..99V 2013A&A...560A..99V
ADC_Keywords: Galaxies, Seyfert ; Spectra, infrared
Keywords: galaxies: active - galaxies: ISM - galaxies: Seyfert
Abstract:
The excitation of the gas phase of the interstellar medium can be
driven by various mechanisms. In galaxies with an active nucleus, such
as Seyfert galaxies, both radiative and mechanical energy from the
central black hole, or the stars in the disk surrounding it may play a
role.
We investigate the relative importance and range of influence of the
active galactic nucleus for the excitation of ionized and molecular
gas in the central kiloparsec of its host galaxy.
We present H- and K-band long-slit spectra for a sample of 21 nearby
(D<70Mpc) Seyfert galaxies obtained with the NIRSPEC instrument
on the Keck telescope. For each galaxy, we fit the nebular line
emission, stellar continua, and warm molecular gas as a function of
distance from the nucleus.
Description:
The following data products (FITS-files) are made available.
The calibrated long-slit spectra contain the long-slit spectra, fully
calibrated as described in Section 2.3 of the paper. All pertinent
information concerning the observations (position, observation date,
airmass, wavelengths, flux conversion factor etc.) are contained in
the standard FITS header. In the second layer of this file, the
``correction spectrum'' is appended.
The fitting results contain the results of the pPXF + GANDALF fits
(Section 2.4). This multi-layered file contains 1) the input spectrum
(rebinned to ln, multiplied by 1e13 for computational reasons), 2) the
best fitting model, 3) the best fitting emission line spectrum, 4) the
best fitting spectrum with emission lines removed, 5) the derived
stellar and gaseous parameters, 6) normalized weights assigned to each
stellar template, and 7) the optimal combination of stellar templates.
The format of layer 5) is a 2-dimensional matrix with 101 columns
(i.e. for each position in the long-slit spectrum). Each row contains
the stellar kinematics; V, sigma, h3, h4, h5, h6, and the gaseous
kinematics; flux, amplitude, V, sigma, Amplitude-over-Noise of each
line (5/13 emission lines in the H/K band, see Table 3) for each
position in the slit. The outer positions, where the S/N of the
observations was extremely poor, were set to zero to reduce
computation time.
This file structure is directly generated by pPXF and GANDALF, see the
README file distributed with the GANDALF code for more information
http://star-www.herts.ac.uk/~sarzi/PaperV_nutshell/PaperV_nutshell.html
Further, nuclear / off-nuclear integrated spectra are available in the
same formats. These data offer a simple comparison between nuclear and
off-nuclear regions in the full long-slit spectra. Calibrated spectra
are given for a nuclear and two off-nuclear (symmetric about the
nucleus) regions. The positions used to generate these summed spectra
are indicated in the FITS-header. The pPXF + GANDALF fitting result
contains a further fourth spectrum, which is the sum of the two
off-nuclear region spectra.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 189 21 List of observed galaxies
fits/* . 168 Individual spectra as FITS files
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Byte-by-byte Description of file: list.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Name Simbad galaxy name
10- 11 I2 h RAh Simbad Hour of Right Ascension (J2000.0)
13- 14 I2 min RAm Simbad Minute of Right Ascension (J2000.0)
16- 20 F5.2 s RAs Simbad Second of Right Ascension (J2000.0)
22 A1 --- DE- Simbad Sign of the Declination (J2000.0)
23- 24 I2 deg DEd Simbad Degree of Declination (J2000.0)
26- 27 I2 arcmin DEm Simbad Arcminute of Declination (J2000.0)
29- 32 F4.1 arcsec DEs Simbad Arcsecond of Declination (J2000.0)
34- 37 A4 --- Type Seyfert type
39- 56 A18 --- FileName1 Name of the file with reduced and calibrated
spectrum in H-band, in subdirectory fits
58- 75 A18 --- FileName2 Name of the file with reduced and calibrated
spectrum in K-band, in subdirectory fits
77- 95 A19 --- FileName3 Name of the file with reduced and calibrated
spectrum of nuc/off-nuc positions in H-band,
in subdirectory fits
97-115 A19 --- FileName4 Name of the file with reduced and calibrated
spectrum of nuc/off-nuc positions in K-band,
in subdirectory fits
117-133 A17 --- FileName5 Name of the file with fitting result of full
spectrum in H-band, in subdirectory fits (1)
135-151 A17 --- FileName6 Name of the file with fitting result of full
spectrum in K-band, in subdirectory fits (1)
153-170 A18 --- FileName7 Name of the file with fitting result of
nuc/off-nuc positions in H-band,
in subdirectory fits (1)
172-189 A18 --- FileName8 Name of the file with fitting result of
nuc/off-nuc positions in K-band,
in subdirectory fits (1)
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Note (1): Format of the fitting results:
The fitting results contain the results of the pPXF + GANDALF fits
(Section 2.4). This 7-layered file contains the layers:
#0 = the input spectrum (rebinned to ln, multiplied by 1013 for
computational reasons)
#1 = the best fitting model
#2 = the best fitting emission line spectrum
#3 = the best fitting spectrum with emission lines removed
#4 = the derived stellar and gaseous parameters, consisting in a 2-dimensional
matrix with 101 columns (one for each position in the long-slit), or 4
columns for the nuclear/off-nuclear fits; the rows (31 in H, 76 in K)
contain the stellar kinematics (V, σ, h3, h4, h5, h6), and the
gaseous kinematics (flux, amplitude, V, σ, Amplitude/Noise) for
each of the emission lines (5 lines in H-band, 14 in the K-band;
wavelengths in µm):
[FeII](1.533); [FeII](1.644); [FeII](1.679); Brζ(1.736), H2(1.747);
H2(2.0338); HeI(2.0587); H2(2.0656); H2(2.0737); H2(2.1218);
NeII(2.1480); H2(2.1542); Brγ(2.1661); H2(2.2014); H2(2.2233);
H2(2.2477); CaVIII(2.3211); H2(2.3550); H2(2.3858)
#5 = normalized weights assigned to each stellar template
#6 = the optimal combination of stellar templates.
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Acknowledgements:
Tessel van der Laan, vanderlaan(at)iram.fr
(End) Patricia Vannier [CDS] 17-Oct-2013