J/ApJ/903/91 GAMA; Activity of emission-line systems in G23 (Yao+, 2020)
Galaxy and Mass Assembly (GAMA); A WISE Study of the Activity of Emission-line
Systems in G23.
Yao H.F.M., Jarrett T.H., Cluver M.E., Marchetti L., Taylor E.N.,
Santos M.G., Owers M.S., Lopez-Sanchez A.R., Gordon Y.A., Brown M.J.I.,
Brough S., Phillipps S., Holwerda B.W., Hopkins A.M., Wang L.
<Astrophys. J., 903, 91 (2020)>
=2020ApJ...903...91Y 2020ApJ...903...91Y
ADC_Keywords: Galaxies; Spectra, infrared; Spectra, optical
Keywords: Galaxy evolution ; AGN host galaxies ; Infrared galaxies
Abstract:
We present a detailed study of emission-line systems in the Galaxy And
Mass Assembly (GAMA) G23 region, making use of Wide-field Infrared
Survey Explorer (WISE) photometry that includes carefully measured
resolved sources. After applying several cuts to the initial catalog
of ∼41000 galaxies, we extract a sample of 9809 galaxies. We then
compare the spectral diagnostic Baldwin, Philips & Terlevich (BPT)
classification of 1154 emission-line galaxies (38% resolved in W1) to
their location in the WISE color-color diagram, leading to the
creation of a new zone for mid-infrared "warm" galaxies located
2σ above the star-forming sequence, below the standard WISE
active galactic nucleus (AGN) region. We find that the BPT and WISE
diagrams agree on the classification for 85% and 8% of the galaxies as
non-AGN (star-forming=SF) and AGN, respectively, and disagree on ∼7%
of the entire classified sample. Thirty-nine percent of the AGNs (all
types) are broad-line systems for which the [NII] and [Hα]
fluxes can barely be disentangled, giving in most cases spurious
[NII]/[Hα] flux ratios. However, several optical AGNs appear to
be completely consistent with SF in WISE. We argue that these could be
low-power AGNs, or systems whose hosts dominate the IR emission.
Alternatively, given the sometimes high [OIII] luminosity in these
galaxies, the emission lines may be generated by shocks coming from
super-winds associated with SF rather than AGN activity. Based on our
findings, we have created a new diagnostic: [W1-W2] versus
[NII]/[Hα], which has the virtue of separating SF from AGNs and
high- excitation sources. It classifies 3 to ∼5 times more galaxies
than the classic BPT.
Description:
The primary data for this study come from the Galaxy and Mass Assembly
(GAMA) Survey (Driver+, 2011, J/MNRAS/413/971). GAMA is a
spectroscopic survey complete down to 19.8mag in the r band (for the
three equatorial fields), covering a total area of ∼286deg2. Its
multiwavelength coverage spans the optical (VST KiDS; Kilo- Degree
Survey), near-infrared (VIKING; VISTA Kilo-degree Infrared Galaxy
Survey), and far-infrared (Herschel).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 122 100 Measured properties of a representative sample of
galaxies from each activity group
table4.dat 68 100 Derived properties of a representative sample of the
galaxies from each activity group
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See also:
II/282 : The SDSS Photometric Catalog, Release 6 (Adelman-McCarthy+, 2007)
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
VII/250 : The 2dF Galaxy Redshift Survey (2dFGRS) (2dFGRS Team, 1998-2003)
J/ApJS/121/473 : A diagnostic diagram for Seyfert 2 Galaxies (Bassani+, 1999)
J/ApJ/642/673 : IR-selected obscured AGN candidates (Polletta+, 2006)
J/ApJ/663/81 : SED of hard X-ray selected AGN in XMDS (Polletta+, 2007)
J/AJ/136/2373 : Type 2 quasars from SDSS (Reyes+, 2008)
J/ApJ/713/970 : Low-resolution SED templates AGNs & galaxies (Assef+, 2010)
J/MNRAS/413/971 : Galaxy And Mass Assembly (GAMA) DR1 (Driver+, 2011)
J/ApJ/772/26 : AGN with WISE. II. The NDWFS Bootes field (Assef+, 2013)
J/ApJS/212/18 : An atlas of UV-to-MIR galaxy SEDs (Brown+, 2014)
J/MNRAS/452/2087 : Galaxy And Mass Assembly (GAMA): DR2 (Liske+, 2015)
J/ApJ/805/90 : WISE ELIRGs and comparison with QSOs (Tsai+, 2015)
J/MNRAS/464/1306 : LARGESS survey (Ching+, 2017)
J/MNRAS/474/3875 : Galaxy And Mass Assembly (GAMA): DR3 (Baldry+, 2018)
J/ApJ/864/40 : The HIPASS Catalog (HICAT) + WISE galaxies (Parkash+, 2018)
J/ApJS/245/25 : WISE Extended Source Catalog (WXSC). I. (Jarrett+, 2019)
http://www.gama-survey.org/ : GAMA survey webpage
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Group Activity group (1)
11- 17 I7 --- ID Galaxy identifier in GAMA catalog
19 A1 --- f_ID [*] Selected galaxies for case study in the
next section (16 occurrences)
21 A1 --- fID [+] Broad-line AGNs (31 occurrences)
23- 28 F6.4 --- z [0.005/0.3] Spectroscopic redshift from GAMA
30- 34 F5.2 mJy W1 [0.2/15] W1 flux
36- 39 F4.2 mJy e_W1 [0.01/0.16] Error on W1
41- 44 F4.2 mJy W2 [0.1/8] W2 flux
46- 49 F4.2 mJy e_W2 [0.01/0.2] Error on W2
51- 55 F5.2 mJy W3 [0.24/21.3] W3PAH flux
57- 60 F4.2 mJy e_W3 [0.07/5] Error on W3
62- 66 F5.2 mag W1-W2 [-0.13/1.52] W1-W2 color
68- 71 F4.2 mag e_W1-W2 [0.03/0.2] Error on W1-W2
73- 76 F4.2 mag W2-W3 [2.04/5.04] W2-W3 color
78- 81 F4.2 mag e_W2-W3 [0.04/0.5] Error on W2-W3
83- 87 F5.2 --- OIII/Hb [0.11/12.2] [OIII]/Hβ
89- 92 F4.2 --- e_OIII/Hb [0.01/2] Error on OIII/Hb
94- 97 F4.2 --- NII/Ha [0.07/3] [NII]/Hα
99-102 F4.2 --- e_NII/Ha [0/0.4] Error on NII/Ha
104-112 F9.5 deg RAdeg [339/351] Right ascension (J2000) column added
by CDS (sent by the author)
114-122 F9.5 deg DEdeg [-36/-30] Declination (J2000) column added by
CDS (sent by the author)
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Note (1): Groups as follows:
SF = Star forming
comp = Composites
mAGN = AGN galaxies in zone 1 (locations of the WISE powerful AGNs)
mSF = AGN galaxies in zone 3 (non-AGN zone)
mWarm = Galaxies AGN warmer than typical star forming in zone 2 (locations of
the low-power AGNs)
non-mAGN = non AGN galaxies in zone 1 (locations of the WISE powerful AGNs)
non-mWarm = Galaxies non AGN warmer than typical star forming in zone 2
(locations of the low-power AGNs)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Group Activity group (1)
11- 17 I7 --- ID Galaxy identifier in GAMA catalog
19 A1 --- f_ID [*] Selected galaxies for case study in the next
section (16 occurrences)
21 A1 --- fID [+] Broad-line AGNs (31 occurrences)
23- 27 F5.2 Msun Mass [9.05/11.9] Log mass (2)
29- 32 F4.2 Msun e_Mass [0.08/0.4] Error on Mass
34- 39 F6.2 Msun/yr SFR [0.15/175] Star forming rate at 12µm (3)
41- 45 F5.2 Msun/yr e_SFR [0.07/69] Error on SFR
47- 51 F5.2 erg/s LOIII [39.4/43]? log [OIII] luminosity
53- 56 F4.2 erg/s e_LOIII [0/0.3]? Error on LOIII
58- 63 F6.2 /yr sSFR [-10.5/-8.81] Specific star-formation rate
65- 68 F4.2 /yr e_sSFR [0.1/0.5] Error on sSFR
--------------------------------------------------------------------------------
Note (1): Groups as follows:
SF = Star forming
comp = Composites
mAGN = AGN galaxies in zone 1 (locations of the WISE powerful AGNs)
mSF = AGN galaxies in zone 3 (non-AGN zone)
mWarm = Galaxies AGN warmer than typical star forming in zone 2 (locations of
the low-power AGNs)
non-mAGN = non AGN galaxies in zone 1 (locations of the WISE powerful AGNs)
non-mWarm = Galaxies non AGN warmer than typical star forming in zone 2
(locations of the low-power AGNs)
Note (2): The stellar masses are derived based on the M/L from
Cluver+, 2014ApJ...782...90C 2014ApJ...782...90C.
Note (3): The star formation rates are derived using νL(12µm) and the
calibration from Cluver+, 2017ApJ...850...68C 2017ApJ...850...68C.
--------------------------------------------------------------------------------
Acknowledgements:
Harris Yao Fortune Marc [yao.fortune at gmail.com]
History:
From electronic version of the journal
References :
Driver et al. Paper I: 2009A+G....50e..12D 2009A+G....50e..12D
Driver et al. Paper II: 2011MNRAS.413..971D 2011MNRAS.413..971D Cat. J/MNRAS/413/971
(End) Prepared by Coralie Fix [CDS], 28-Feb-2022