J/MNRAS/449/3191 IR photometry of nearby RLGs (Yang+, 2015)
Infrared colour properties of nearby radio-luminous galaxies.
Yang X.-H., Chen P.-S., Huang Y.
<Mon. Not. R. Astron. Soc., 449, 3191-3201 (2015)>
=2015MNRAS.449.3191Y 2015MNRAS.449.3191Y (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, radio ; Photometry, infrared
Keywords: surveys - galaxies: active - galaxies: photometry -
galaxies:star formation - infrared: galaxies
Abstract:
By combining the data of the Two Micron All Sky Survey, the Wide-Field
Infrared Survey Explorer and the AKARI satellite, we study the
infrared colour properties of a sample of 2712 nearby radio-luminous
galaxies (RLGs). These RLGs are divided into radio-loud (RL) active
galactic nuclei (AGNs), mainly occurring at redshifts of 0.05<z<0.3
and star-forming-dominated RLGs (SFGs), mainly occurring at redshifts
of 0.01<z<0.15. RL AGNs and SFGs are separately distributed in the
([3.4]-[4.6])-([4.6]-[12]) two-colour diagram, in which the RL AGNs
display a double-core distribution, and the SFGs display a single-core
distribution. SFGs have a redder [4.6]-[12] colour than RL AGNs due to
the significant contribution from the dust component of SFGs. We find
simple criteria of mid-infrared (MIR) colour separation between RL
AGNs and SFGs such that: 95 per cent of RL AGNs have [4.6]-[12]<3.0
and 94 per cent of SFGs have [4.6]-[12]>3.0. We also analyse the MIR
colours of RL AGNs divided into low- and high-excitation radio
galaxies (LERGs and HERGs, respectively). The
([3.4]-[4.6])-([4.6]-[12]) diagram clearly shows separate
distributions of LERGs and HERGs and a region of overlap, which
suggests that LERGs and HERGs have different MIR properties. LERGs are
responsible for the double-core distribution of RL AGNs on the
([3.4]-[4.6])-([4.6]-[12]) diagram. In addition, we also suggest
90-140µm band spectral index α(90, 140)←1.4 as a criterion
of selecting nearby active galaxies with non-thermal emissions at
far-infrared wavelengths.
Description:
All sources studied here were selected from a catalogue of 2712 RLGs
(Best et al., 2005, Cat. J/MNRAS/362/9).
To obtain the NIR, MIR and FIR photometric data of the studied radio
sources, we primarily used the point source catalogues (PSCs) of
2MASS, WISE and AKARI (Skrutskie et al., 2006, Cat. VII/233; Ishihara
et al. 2010, Cat. II/297; Yamamura et al. 2010, Cat. II/298).
Finally, we excluded RLGs without 2MASS counterparts and obtained a
sample of 2663 RLGs.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 166 2663 Infrared photometric data of nearby RLGs
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See also:
II/297 : AKARI/IRC mid-IR all-sky Survey (ISAS/JAXA, 2010)
II/298 : AKARI/FIS All-Sky Survey PS Catalog(ISAS/JAXA, 2010)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/MNRAS/362/9 : Radio-loud AGN in SDSS (Best+, 2005)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 F8.4 deg RAdeg Right ascension (J2000) (1)
10- 17 F8.4 deg DEdeg Declination (J2000) (1)
19- 24 F6.4 --- z Redshift
26- 31 F6.4 mag E(B-V) Derived E(B-V)
33 A1 --- l_Jmag Upper limit flag on Jmag
34- 39 F6.3 mag Jmag 2MASS J magnitude
41- 45 F5.3 mag e_Jmag ? rms uncertainty on Jmag
47 A1 --- l_Hmag Upper limit flag on Hmag
48- 53 F6.3 mag Hmag 2MASS H magnitude
55- 59 F5.3 mag e_Hmag ? rms uncertainty on Hmag
61 A1 --- l_Ksmag Upper limit flag on Ksmag
62- 67 F6.3 mag Ksmag 2MASS Ks magnitude
69- 73 F5.3 mag e_Ksmag ? rms uncertainty on Ksmag
75 A1 --- l_W1mag Upper limit flag on W1mag
76- 81 F6.3 mag W1mag Wise W1 magnitude
83- 87 F5.3 mag e_W1mag ? rms uncertainty on W1mag
89- 94 F6.3 mag W2mag Wise W2 magnitude
96-100 F5.3 mag e_W2mag rms uncertainty on W2mag
102 A1 --- l_W3mag Upper limit flag on W3mag
103-108 F6.3 mag W3mag Wise W3 magnitude
110-114 F5.3 mag e_W3mag ? rms uncertainty on W3mag
116 A1 --- l_W4mag Upper limit flag on W4mag
117-122 F6.3 mag W4mag Wise W4 magnitude
124-128 F5.3 mag e_W4mag ? rms uncertainty on W4mag
130-138 E9.5 Jy S90um ? AKARI 90um flux (2)
140-147 E8.5 Jy e_S90um ? rms uncertainty on S90um
149-157 E9.5 Jy S140um ? AKARI 140um flux (2)
159-166 E8.5 Jy e_S140um ? rms uncertainty on S140um
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Note (1): Coordinates from Best et al. (2005, Cat. J/MNRAS/362/9)
Note (2): We list only the sources in which 90- and 140-micron fluxes have high
quality such that the source is confirmed and flux is reliable.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 09-Dec-2015