J/A+A/534/A31 Spectroscopic study of 283 AGNs in Coma (Gavazzi+, 2011)
The complete census of optically selected AGNs in the Coma supercluster:
the dependence of AGN activity on the local environment.
Gavazzi G., Savorgnan G., Fumagalli M.
<Astron. Astrophys., 534, A31 (2011)>
=2011A&A...534A..31G 2011A&A...534A..31G
ADC_Keywords: Clusters, galaxy ; Active gal. nuclei ; Redshifts ;
Equivalent widths
Keywords: galaxies: clusters: individual: Coma - galaxies: evolution -
galaxies: nuclei
Abstract:
To investigate the dependence of the occurrence of active galactic
nuclei (AGNs) on local galaxy density, we study the nuclear properties
of ∼5000 galaxies in the Coma supercluster whose density spans two
orders of magnitude from the sparse filaments to the cores of rich
clusters.
Description:
We obtained optical spectra of the nuclei of 283 galaxies using the
1.5m Cassini telescope of Bologna observatory during 14 runs from 2005
to 2011, using the Bologna Faint Object Spectrograph and Camera
(BFOSC) attached to the 152cm F/8 Cassini Telescope located in
Loiano, belonging to the Observatory of Bologna. Among these galaxies,
177 belong to the Coma supercluster and are added to the 4785 spectra
available from SDSS (DR7) to fill-in the incomplete coverage by SDSS
of luminous galaxies. We perform a spectral classification of the
nuclei of galaxies in this region (with a completeness of 98% at
r≤17.77), classifying the nuclear spectra in six classes: three of
them (SEY, sAGN, LIN) refer to AGNs and the remaining three (HII, RET,
PAS) refer to different stages of starburst activity. We perform this
classification as recommended by Cid Fernandes and collaborators using
the ratio of λ6584 [NII] to Hα lines and the equivalent
width of Hα (WHAN diagnostic), after correcting the last
quantity by 1.3Å for underlying absorption.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 87 283 Parameters of 283 galaxies observed at Loiano
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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- 15 A15 --- Name Galaxy name
17- 18 I2 h RAh Right ascension (J2000)
20- 21 I2 min RAm Right ascension (J2000)
23- 26 F4.1 s RAs Right ascension (J2000)
28 A1 --- DE- Declination sign (J2000)
29- 30 I2 deg DEd Declination (J2000)
32- 33 I2 arcmin DEm Declination (J2000)
35- 36 I2 arcsec DEs Declination (J2000)
38- 45 F8.5 --- z Redshift
47- 57 F11.5 0.1nm W(Ha) Equivalent width of Hα line
59- 66 F8.3 0.1nm W(NII) Equivalent width of {lalmbda}6584 [NII] line
68- 71 A4 --- Class Type of galaxy (1)
73- 81 A9 --- n_z Other spectra available in NED and/or SDSS (2)
83- 87 A5 --- Act Type of activity
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Note (1): Type of galaxy as follows:
HII = HII region-like
LIN = weak AGNs
PAS = passive nuclei
RET = fake AGNs
SY1 = Seyfert 1 galaxies
sAGN = strong AGN
Note (2): SDSS-corr means that the SDSS spectrum is partly corrupted
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 29-Dec-2011