J/ApJS/201/31 Emission-line galaxies from SDSS. I. (Ge+, 2012)
Double-peaked narrow emission-line galaxies from the Sloan Digital Sky Survey.
I. Sample and basic properties.
Ge J.-Q., Hu C., Wang J.-M., Bai J.-M., Zhang S.
<Astrophys. J. Suppl. Ser., 201, 31 (2012)>
=2012ApJS..201...31G 2012ApJS..201...31G
ADC_Keywords: Active gal. nuclei ; Velocity dispersion ; Redshifts ;
Galaxies, spectra ; Line Profiles ; Photometry, SDSS
Keywords: black hole physics - galaxies: evolution
Abstract:
Recently, much attention has been paid to double-peaked narrow
emission-line (NEL) galaxies, some of which are suggested to be
related to merging galaxies. We make a systematic search to build the
largest sample of these sources from Data Release 7 of the Sloan
Digital Sky Survey (SDSS). With reasonable criteria for fluxes, FWHMs
of the emission lines, and separations of the peaks, we select 3030
double-peaked NEL galaxies. In light of the existence of broad Balmer
lines and the locations of the two components of double-peaked NELs
distinguished by the Kauffmann et al. (2003MNRAS.346.1055K 2003MNRAS.346.1055K) criteria
in the Baldwin-Phillips-Terlevich diagram, we find that there are 81
Type I active galactic nuclei (AGNs), 837 double Type II AGNs (2-Type
II), 708 galaxies with double star-forming components (2-SF), 400 with
mixed star-forming and Type II AGN components (Type II + SF), and 1004
unknown-type objects. As a by-product, a sample of galaxies (12582)
with asymmetric or top-flat profiles of emission lines is established.
After visually inspecting the SDSS images of the two samples, we find
54 galaxies with dual cores.
Description:
For the goal of selecting pp-galaxies, we develop a series of
automatic algorithms in light of Monte Carlo simulations. We apply the
algorithms to SDSS galaxy spectra and get candidates from the
pp-galaxies. Then we visually inspect the candidate spectra to
establish the final sample. We start from the database of the MPA-JHU
SDSS-DR7 galaxy sample.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 173 3030 Emission-line galaxies with double-peaked narrow
emission-lines galaxies (pp-galaxies)
table4.dat 173 12582 Emission-line galaxies with asymmetric and top-flat
narrow emission-line (asym-NEL galaxies)
table5.dat 88 345 List of pp-AGN (110) and asym-NEL AGNs (235) with
strong [OIII] wings
table6.dat 77 54 *List of 54 dual-core pp-galaxies (nos. 1-15) and
asym-NEL galaxies (nos. 16-54)
table7.dat 117 258 List of 255 galaxies with dual cores separated ≥3"
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Note on table6.dat: The images and the spectra of the 54 galaxies are shown in
Figure 11. The number sequence of the images should be from left to right and
from top to bottom.
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See also:
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
J/ApJS/201/23 : Spectroscopy of 88 z<0.7 SDSS QSOs (Eracleous+, 2012)
J/ApJ/708/427 : Type 2 AGNs with double-peaked [OIII] lines (Liu+, 2010)
J/ApJ/716/866 : SDSS search for binary AGN (Smith+, 2010)
J/ApJ/705/L76 : AGNs with double-peaked [OIII] lines (Wang+, 2009)
J/AJ/126/1720 : ugriz and Hα of double-peaked AGN (Strateva+, 2003)
J/ApJ/599/886 : Emission lines of radio-loud AGN (Eracleous+, 2003)
http://www.mpa-garching.mpg.de/SDSS/DR7 : MPA/JHU DR7 online access
Byte-by-byte Description of file: table[34].dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- SDSS SDSS-DR7 name (JHHMMSS.ss+DDMMSS.s)
21- 25 I5 d MJD Modified Julian Date of spectroscopic
observation
27- 30 I4 --- Plate SDSS plate identifier
32- 34 I3 --- Fib SDSS fiber identifier
36- 42 F7.5 --- z [0.00824/0.63518] Spectroscopic redshift
44- 50 F7.5 --- e_z Uncertainty in z
52- 56 F5.2 mag rmag ?=0 SDSS r band magnitude
58- 62 F5.1 km/s sigma Velocity dispersion of galaxy absorption
64- 68 F5.1 km/s e_sigma Uncertainty in sigma
70- 75 F6.1 km/s DelVb Blue NEL component doppler blueshift
77- 80 F4.1 km/s e_DelVb Uncertainty in DelVb
82- 87 F6.1 km/s DelVr Red NEL component doppler redshift
89- 94 F6.1 km/s e_DelVr Uncertainty in DelVr
96-100 F5.1 km/s sigb Blue NEL component velocity dispersion
102-105 F4.1 km/s e_sigb Uncertainty in sigmab
107-111 F5.1 km/s sigr Red NEL component velocity dispersion
113-118 F6.1 km/s e_sigr Uncertainty in sigmar
120-125 F6.1 10-20W/m2 FbO3 ?=0 Blue [OIII] component flux
(in units of 1e-17erg/s/cm2)
127-131 F5.1 10-20W/m2 e_FbO3 ?=0 Uncertainty in FbO3
133-139 F7.1 10-20W/m2 FrO3 ?=0 Red [OIII] component flux
(in units of 1e-17erg/s/cm2)
141-145 F5.1 10-20W/m2 e_FrO3 ?=0 Uncertainty in FrO3
147-152 F6.1 10-20W/m2 FbHa ?=0 Blue Hα component flux
(in units of 1e-17erg/s/cm2)
154-158 F5.1 10-20W/m2 e_FbHa ?=0 Uncertainty in FbHa
160-165 F6.1 10-20W/m2 FrHa ?=0 Red Hα component flux
(in units of 1e-17erg/s/cm2)
167-171 F5.1 10-20W/m2 e_FrHa ?=0 Uncertainty in FrHa
173 I1 --- T [1/5] Type of double-peaked galaxy (1)
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Note (1): Type as follows:
1 = Type I;
2 = Type II + Type II;
3 = Type II + SF;
4 = SF + SF;
5 = "unknown-type".
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Byte-by-byte Description of file: table[56].dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Index number
5- 23 A19 --- SDSS SDSS-DR7 name (JHHMMSS.ss+DDMMSS.s)
25- 29 I5 d MJD Modified Julian Date of spectroscopic observation
31- 34 I4 --- Plate SDSS plate identifier
36- 38 I3 --- Fib SDSS fiber identifier
40- 47 F8.6 --- z Spectroscopic redshift
49- 53 F5.2 mag rmag SDSS r band magnitude
55- 60 F6.1 km/s DelVO3 ? Shift of strong [OIII] wings (table5)
62- 66 F5.2 [10-7W] logLO3 ? Log [OIII] wings luminosity in erg/s (table5)
68- 88 A21 --- Type Object type
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Index number
5- 23 A19 --- SDSS Primary core SDSS-DR7 name
(JHHMMSS.ss+DDMMSS.s) (1)
25- 29 I5 d MJD Modified Julian Date of spectroscopic
observation of primary core
31- 34 I4 --- Plate Primary core SDSS plate identifier
36- 38 I3 --- Fib Primary core SDSS fiber identifier (2)
40- 46 F7.5 --- z Spectroscopic redshift of primary core
48- 52 F5.2 mag rmag SDSS r band magnitude of primary core
54- 72 A19 --- SDSS2 Secondary core SDSS-DR7 name (1)
74- 78 I5 d MJD2 ? Modified Julian Date of spectroscopic
observation of secondary core
80- 83 I4 --- Plate2 ? Secondary core SDSS plate identifier
85- 87 I3 --- Fib2 ? Secondary core SDSS fiber identifier (2)
89- 95 F7.5 --- z2 ? Spectroscopic redshift of secondary core
97-101 F5.2 mag rmag2 ? SDSS r band magnitude of secondary core
103-117 A15 --- Note Secondary core property (3)
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Note (1): There are 39 sources with SDSS spectra observation of the secondary
core, and have Δz<0.0017 (500km/s).
Note (2): It should be noted that SDSS fibers only cover 3" and the
double-peaked profiles of these source only originate from one of the
cores marked by red square in the images given by Figure 12 as shown
by Appendix C.
Note (3): normal (single-peaked) galaxy, pp-galaxy, asym-NEL galaxy.
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History:
* 09-Oct-2012: From electronic version of the journal
* 28-Nov-2012: two masmatching SDSS names fixed:
- in table5: J020814.57-093247.3 fixed into J020814.56-093247.3
- in table7: J125136.45+201012.3 fixed into J125136.44+201012.3
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 09-Oct-2012