J/A+A/558/A68 Red nuclear spectra of 376 local galaxies (Gavazzi+, 2013)
Red-channel (6000-8000 Å) nuclear spectra of 376 local galaxies.
Gavazzi G., Consolandi G., Dotti M., Fossati M., Savorgnan G., Gualandi R.,
Bruni I.
<Astron. Astrophys. 558, A68 (2013)>
=2013A&A...558A..68G 2013A&A...558A..68G
ADC_Keywords: Galaxies, nearby ; Active gal. nuclei ; Spectroscopy
Keywords: galaxies: active - galaxies: nuclei - galaxies: Seyfert
Abstract :
We obtained long-slit optical spectra of the nuclear regions of 376
galaxies in the local Universe using the 1.5m Cassini telescope of
Bologna Observatory. Of these spectra, 164 were either never taken
before by the Sloan Digital Sky Survey (SDSS), or given by the Nasa
Extragalactic Database (NED). With these new spectra, we contribute
investigating the occurrence of active galactic nuclei (AGNs).
Nevertheless, we stress that the present sample is by no means
complete, thus, it cannot be used to perform any demographic study.
Following the method used in a previous work, we classify the nuclear
spectra using a six bin scheme: SEY (Seyfert), sAGN (strong AGN), and
wAGN (weak AGN) represent active galactic nuclei of different levels
of activity; HII accounts for star-forming nuclei; RET (retired) and
PAS (passive) refer to nuclei with poor or no star-formation activity.
The spectral classification is performed using the ratio of 6584[NII]
to Hα lines and the equivalent width (EW) of Hα versus
[NII]/Hα (WHAN diagnostic introduced by Cid Fernandes and
collaborators) after correcting Hα for underlying absorption.
Description:
Spectra in the range 6000-8000Å for 376 galaxies are presented.
For each galaxy we give basic parameters and details of the
observations performed at the 1.5 Loiano (It) telescope. We also
provide the measurements of equivalent widths of the Hα and [NII]
lines as well as a nuclear activity classification
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 71 376 Galaxy general parameters
table4.dat 102 376 Observed line parameters
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See also:
J/A+A/534/A31 : Spectroscopic study of 283 AGNs in Coma (Gavazzi+, 2011)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/376] Sequential number
5- 22 A18 --- Obj Galaxy identifier (G1)
23 A1 --- n_Obj [*] Note for L11-M33-HII (1)
24- 25 I2 h RAh Right Ascension (J2000)
27- 28 I2 min RAm Right Ascension (J2000)
30- 33 F4.1 s RAs Right Ascension (J2000)
35 A1 --- DE- Declination sign (J2000)
36- 37 I2 deg DEd Declination (J2000)
39- 40 I2 arcmin DEm Declination (J2000)
42- 43 I2 arcsec DEs Declination (J2000)
45- 53 F9.6 --- z Redshift from NED
55- 59 F5.1 Mpc Dist Distance from NED
61- 65 F5.2 mag rmag ? Gunn r magnitude (AB), or another filter
67 A1 --- n_rmag [BVRI] when magnitude in an other band (VEGA)
69 A1 --- NEDs [x] x when nuclear spectrum available from NED
71 A1 --- SDSS [x] x when nuclear spectrum available from SDSS
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Note (1): L11-M33-HII is an HII region of M33. Authors prefer to call the
object M33-HII to stress this is not a nuclear spectrum of a galaxy.
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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- 3 I3 --- Seq [1/376] Sequential number
5- 22 A18 --- Obj Galaxy identifier (G1)
24- 25 I2 --- N [1/14] Number of individual exposures
27- 30 I4 s Texp [20/1200] Exposure time of individual exposures
32- 34 F3.1 arcsec Ap [2/2.5] Slit aperture
36- 38 I3 deg PA Slit orientation (antickwise from N)
40- 68 A29 --- P.A. Slit orientation (antickwise from N) in the
various runs
70- 75 F6.2 0.1nm W[NII]1 ? [NII]λ6548.1Å equivalent width (2)
77- 84 F8.2 0.1nm WHa ? Hα equivalent width
86- 92 F7.2 0.1nm W[NII]2 ? [NII]λ6583.6Å equivalent width (2)
94- 97 F4.2 ct rms rms noise in spectrum determined between
6400 and 6500Å
99-102 A4 --- Class Spectral nuclear classification (3)
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Note (2): negative EW values represent emission.
Note (3): the 6 nuclear classes are:
HII = HII region-like nucleus
PAS = passive (show no star formation activity)
RET = retired nuclei (fake AGN): ionization mechanism is provided by
the old stellar population
SEY1 = Seyfert-1 (broad-line systems)
sAGN = strong AGN activity
wAGN = weak AGN activity
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Global notes:
Note (G1): The first three digits of the label give the year of observation.
L00 marks those spectra that are a median of two or more spectra obtained in
different runs.
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Acknowledgements:
Giuseppe gavazzi, gavazzi(at)mib.infn.it
(End) Patricia Vannier [CDS] 27-Aug-2013