J/ApJ/856/93 SDSS-IV MaNGA: kinematic galaxy pairs (Fu+, 2018)
SDSS-IV MaNGA: galaxy pair fraction and correlated active galactic nuclei.
Fu H., Steffen J.L., Gross A.C., Dai Y.S., Isbell J.W., Lin L., Wake D.,
Xue R., Bizyaev D., Pan K.
<Astrophys. J., 856, 93-93 (2018)>
=2018ApJ...856...93F 2018ApJ...856...93F (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei; Galaxies, spectra; Galaxies, interacting;
Redshifts; Velocity dispersion
Keywords: galaxies: active; galaxies: interactions; galaxies: nuclei
Abstract:
We have identified 105 galaxy pairs at z∼0.04 with the MaNGA
integral-field spectroscopic data. The pairs have projected
separations between 1 and 30kpc, and are selected to have radial
velocity offsets less than 600km/s and stellar mass ratio between
0.1 and 1. The pair fraction increases with both the physical size of
the integral-field unit and the stellar mass, consistent with
theoretical expectations. We provide the best-fit analytical function
of the pair fraction and find that ∼3% of M* galaxies are in close
pairs. For both isolated galaxies and paired galaxies, active galactic
nuclei (AGNs) are selected using emission-line ratios and Hα
equivalent widths measured inside apertures at a fixed physical size.
We find AGNs in ∼24% of the paired galaxies and binary AGNs in ∼13% of
the pairs. To account for the selection biases in both the pair sample
and the MaNGA sample, we compare the AGN comoving volume densities
with those expected from the mass- and redshift-dependent AGN
fractions. We find a strong (∼5x) excess of binary AGNs over random
pairing and a mild (∼20%) deficit of single AGNs. The binary AGN
excess increases from ∼2x to ∼6x as the projected separation decreases
from 10-30 to 1-10kpc. Our results indicate that the pairing of
galaxies preserves the AGN duty cycle in individual galaxies but
increases the population of binary AGNs through correlated activities.
We suggest tidally induced galactic-scale shocks and AGN
cross-ionization as two plausible channels to produce low-luminosity
narrow-line-selected binary AGNs.
Description:
MaNGA utilizes 17 optical fiber-bundle IFUs to observe thousands of
nearby galaxies with the SDSS 2.5m telescope.
As described in Wake+ (2017, J/AJ/154/86), the MaNGA main galaxy
sample is selected from an enhanced version of the NASA-Sloan Atlas
catalog (NSA v101; http://www.nsatlas.org/), which includes 641490
galaxies at z<0.15.
The Fourteenth Public Data Release (DR14; Abolfathi+ 2018ApJS..235...42A 2018ApJS..235...42A)
includes 2772 galaxy datacubes, 54 of which are repeated observations.
The MaNGA sample in this paper consists of the 2618 unique galaxies in
the main galaxy sample.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 76 210 Galaxy pairs in SDSS-IV MaNGA (DR14)
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See also:
V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)
J/ApJ/565/208 : Galaxy pairs in the CNOC2 Redshift Survey (Patton+, 2002)
J/ApJS/143/315 : IRAS 1Jy sample of ultraluminous gal. II. (Veilleux+, 2002)
J/AJ/126/1607 : IRAS Revised Bright Galaxy Sample (Sanders+, 2003)
J/AJ/130/1516 : MCG pairs and triples of galaxies (De Propris+, 2005)
J/ApJ/690/20 : Models of the AGN & black hole populations (Shankar+, 2009)
J/ApJ/709/884 : Starburst-AGN composites in LIRG mergers (Yuan+, 2010)
J/ApJ/737/101 : AGN pairs from SDSS-DR7. I. (Liu+, 2011)
J/ApJS/196/11 : Bulge+disk decompositions of SDSS galaxies (Simard+, 2011)
J/ApJ/746/L22 : Dual AGNs in the nearby Universe (Koss+, 2012)
J/MNRAS/423/600 : Type-1 low-z AGN emission properties (Stern+, 2012)
J/AJ/154/86 : MaNGA catalog, DR15 (Wake+, 2017)
J/MNRAS/483/4847 : AGN photoionization of gas in companion gal. (Keel+, 2019)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1 A1 --- Set b=binary AGNs; r=remaining pairs
3- 6 I4 --- Plate [7443/9049]? MaNGA DR14 plate number
8- 12 I5 --- IFU [1901/12705]? MaNGA DR14 IFU ID
14 I1 --- Samp [1/3]? Subsample flag (1)
16- 19 F4.1 arcsec Delt [2.4/14.3]? Projected separation, Δθ
21- 24 F4.1 kpc Rp [1.2/29.4]? Projected separation, rp
26- 30 F5.1 km/s Delv [0.6/581.2]? Radial velocity offset, Δv
32- 40 F9.5 deg RAdeg [50/325] Right ascension (J2000)
42- 50 F9.5 deg DEdeg [-0.7/63.2] Declination (J2000)
52- 58 F7.5 --- z [0.015/0.15] Redshift
60- 64 F5.1 km/s sigma [41.3/800] Stellar velocity dispersion,
σstar
66- 69 F4.1 [Msun] logM [7.3/10.5] Log of stellar mass
71- 74 F4.1 [10-7W] logL [38/41.3]? Log of the [OIII] luminosity
in erg/s (2)
76 I1 --- Class [0/5] Emission-line classification (3)
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Note (1): Subsample flag as follows:
1 = Primary Sample (42 occurrences)
2 = Secondary Sample (44 occurrences)
3 = Color enhanced Sample (19 occurrences)
Note (2): [OIII] luminosity from the nuclear spectrum extracted with a 2.6kpc
diameter aperture.
Note (3): Emission-line classification code as follows:
0 = retired galaxy (125 occurrences)
1 = star-forming galaxy (35 occurrences)
2 = starburst-AGN composite (28 occurrences)
3 = LINER (13 occurrences)
4 = type 2 Seyfert (8 occurrences)
5 = type 1 Seyfert (1 occurrence)
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 29-Sep-2023