J/ApJS/262/39 Tidal features in HSC-SSP early-type galaxies (Huang+, 2022)
Massive early-type galaxies in the HSC-SSP: flux fraction of tidal features and
merger rates.
Huang Q., Fan L.
<Astrophys. J. Suppl. Ser., 262, 39 (2022)>
=2022ApJS..262...39H 2022ApJS..262...39H
ADC_Keywords: Galaxies, optical; Redshifts; Photometry, SDSS
Keywords: Early-type galaxies ; Galaxies ; Galaxy evolution ; Galaxy mergers ;
Galaxy interactions ; Galaxy structure ; Galaxy pairs
Abstract:
Here we present a statistical study on tidal features around massive
early-type galaxies (ETGs). Utilizing the imaging data of the Hyper
Suprime-Cam Subaru Strategic Program (HSC-SSP), we measure the flux
fraction of tidal features (ftidal) in 2649 ETGs with stellar mass
M*>1011M☉ and redshift 0.05<z<0.15 using automated
techniques. The Wide layer of HSC-SSP reaches a depth of
∼28.5mag/arcsec2 in the i band. Under this surface brightness limit,
we find that about 28% of these galaxies harbor prominent tidal
features with ftidal>1%, among which the number of ETGs decreases
exponentially with ftidal, with a logarithmic slope of ∼100. Within
the stellar mass range we probe, we note that ftidal increases by a
factor of 2 from M*∼1011 to 1012M☉. We also perform a pair
count to estimate the merger rate of these massive ETGs. Combining the
merger rates with ftidal, we estimate that the typical lifetime of
tidal features is ∼3Gyr, consistent with previous studies.
Description:
The images used in this paper were obtained from the Hyper Suprime-Cam
Subaru Strategic Program (HSC-SSP; Aihara+ 2018PASJ...70S...4A 2018PASJ...70S...4A). We
use the coadded images from the Public Data Release 3 (PDR3; Aihara+
2022PASJ...74..247A 2022PASJ...74..247A), which covers over 1000deg2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 117 2649 Properties of 2649 massive early-type galaxies
(ETGs)
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See also:
V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
J/AJ/130/2647 : Tidal features of nearby red galaxies (van Dokkum+, 2005)
J/ApJ/685/235 : Host and companion galaxies in the SDSS (Patton+, 2008)
J/A+A/525/A157 : SDSS automated morphology classif. (Huertas-Company+, 2011)
J/ApJ/765/28 : CFHTLS galaxies with faint tidal features (Atkinson+, 2013)
J/ApJ/804/34 : Luminous AGNs and early-type SDSS galaxies (Hong+, 2015)
J/MNRAS/446/3943 : galaxies 2D phot. decompositions in SDSS-DR7 (Meert+, 2015)
J/MNRAS/474/3875 : Galaxy And Mass Assembly (GAMA): DR3 (Baldry+, 2018)
J/ApJ/857/144 : Tidal features from RESOLVE & DECaLS (Hood+, 2018)
J/MNRAS/498/2138 : Nearby massive early-type gal. from MATLAS (Bilek+, 2020)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- SDSS SDSS name (JHHMMSS.ss+DDMMSS.s)
21- 29 F9.5 deg RAdeg HSC-SSP PDR3 Right Ascension (J2000)
31- 38 F8.5 deg DEdeg [-2.5/53.2] HSC-SSP PDR3 Declination (J2000)
40- 44 F5.3 --- z [0.05/0.15] SDSS DR16 spectroscopic redshift
46- 50 F5.2 [Msun] logM* [11/12.7] log stellar mass from SDSS DR16
using the method of Chen+ 2012MNRAS.421..314C 2012MNRAS.421..314C
52- 55 F4.2 [Msun] e_logM* [0.06/0.3] Uncertainty in logM*
57- 62 F6.3 mag rmag [13.96/17.8] Apparent r band AB magnitude
64- 68 F5.3 mag e_rmag [0.002/0.03] Uncertainty in rmag (1)
70- 75 F6.3 mag imag [13.59/17.4] Apparent i band AB magnitude
77- 81 F5.3 mag e_imag [0.001/0.06] Uncertainty in imag (1)
83- 87 F5.2 mag rTidal [16.94/29.9]?=99 Tidal feature apparent
r band AB magnitude
89- 93 F5.2 mag e_rTidal [0.01/5.6]?=99 Uncertainty in rTidal (1)
95- 99 F5.2 mag iTidal [17.79/29.5]?=99 Tidal feature apparent
i band AB magnitude
101-105 F5.2 mag e_iTidal [0.01/3.1]?=99 Uncertainty in iTidal (1)
107-111 F5.2 [-] logf [-5.1/0]?=99 log mean flux fraction of
r & i band tidal features
113-117 F5.2 [-] e_logf [0.03/0.22]?=99 Uncertainty in logf (2)
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Note (1): Random noise and gain of the instrument are considered in the errors.
Note (2): The error of ftidal is calculated with the fitting function
Δftidal=-1.40 ftidal+0.22[dex], which is estimated
from the scatter of ftidal in r-band and i-band. Notice that the
data is noisy for ftidal<1%, especially for ftidal≲0.5%.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 21-Nov-2022