J/MNRAS/456/2221 Optically red galaxies in H-ATLAS/GAMA (Dariush+, 2016)
H-ATLAS/GAMA: the nature and characteristics of optically red galaxies detected
at submillimetre wavelengths.
Dariush A., Dib S., Hony S., Smith D.J.B., Zhukovska S., Dunne L.,
Eales S., Andrae E., Baes M., Baldry I., Bauer A., Bland-Hawthorn J.,
Brough S., Bourne N., Cava A., Clements D., Cluver M., Cooray A.,
De Zotti G., Driver S., Grootes M.W., Hopkins A.M., Hopwood R., Kaviraj S.,
Kelvin L., Lara-Lopez M.A., Liske J., Loveday J., Maddox S., Madore B.,
Michalowski M.J., Pearson C., Popescu C., Robotham A., Rowlands K.,
Seibert M., Shabani F., Smith M.W.L., Taylor E.N., Tuffs R., Valiante E.,
Virdee J.S.
<Mon. Not. R. Astron. Soc., 456, 2221-2259 (2016)>
=2016MNRAS.456.2221D 2016MNRAS.456.2221D (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, photometry ; Morphology
Keywords: galaxies: general - submillimetre: galaxies
Abstract:
We combine Herschel/SPIRE submillimetre (submm) observations with
existing multiwavelength data to investigate the characteristics of
low-redshift, optically red galaxies detected in submm bands. We
select a sample of galaxies in the redshift range 0.01≤z≤0.2, having
>5σ detections in the SPIRE 250µm submm waveband. Sources are
then divided into two sub-samples of red and blue galaxies, based on
their UV-optical colours. Galaxies in the red sample account for
∼4.2 per cent of the total number of sources with stellar masses
M*≳1010M☉. Following visual classification of the red
galaxies, we find that ≳30 per cent of them are early-type galaxies
and ≳40 per cent are spirals. The colour of the red-spiral galaxies
could be the result of their highly inclined orientation and/or a
strong contribution of the old stellar population. It is found that
irrespective of their morphological types, red and blue sources occupy
environments with more or less similar densities (i.e. the Σ5
parameter). From the analysis of the spectral energy distributions of
galaxies in our samples based on MAGPHYS, we find that galaxies in the
red sample (of any morphological type) have dust masses similar to
those in the blue sample (i.e. normal spiral/star-forming systems).
However, in comparison to the red-spirals and in particular blue
systems, red-ellipticals have lower mean dust-to-stellar mass ratios.
Besides galaxies in the red-elliptical sample have much lower mean
star formation/specific star formation rates in contrast to their
counterparts in the blue sample. Our results support a scenario where
dust in early-type systems is likely to be of an external origin.
Description:
We use data from the H-ATLAS phase 1 version 3.0 internal release
which contains the IDs of >5σ SPIRE detections at 250um.
We define two sub-samples of red and blue galaxies based on NUV-r
colours.
The morphology of all 117 red galaxies were examined from their SDSS
r-band images, following independent visual inspection by three team
members. Galaxies were classified into three categories of elliptical
(E), spiral (S) and uncertain (U).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 90 117 List of all red galaxies detected in HATLAS
tablea2.dat 62 78 MAGPHYS output parameters for the red galaxies
having WISE observed photometric data
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See also:
J/MNRAS/415/2336 : Herschel-ATLAS Science Demonstration Catalog (Rigby+, 2011)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Index [1/117] Index
5- 11 A7 --- --- [HATLAS-]
12- 27 A16 --- HATLAS HATLAS IAU name (JHHMMSS.s+DDMMSS)
29- 46 I18 --- objId SDSS objId
48- 49 I2 h RAh SDSS right ascension (J2000)
51- 52 I2 min RAm SDSS right ascension (J2000)
54- 58 F5.2 s RAs SDSS right ascension (J2000)
60 A1 --- DE- SDSS declination sign (J2000)
61 I1 deg DEd SDSS declination (J2000)
63- 64 I2 arcmin DEm SDSS declination (J2000)
66- 70 F5.2 arcsec DEs SDSS declination (J2000)
72- 75 F4.2 mag NUV-r NUV-r colour index
77- 82 F6.3 [Mpc-2] log(Σ5) ? Surface density to the fifth nearest
neighbour
84- 88 F5.2 deg i Inclination
90 A1 --- Type [USE] Type (1)
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Note (1): Types as follows:
E = elliptical galaxy
S = spiral galaxy
U = undefined galaxy
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
2- 3 I2 --- Index [1/78] Index
5- 11 A7 --- --- [HATLAS-]
12- 27 A16 --- HATLAS HATLAS IAU name (JHHMMSS.s+DDMMSS)
29- 33 F5.2 [Msun] logM* Stellar mass
35- 39 F5.2 [Msun/yr] log(SFR) Star formation rate
41- 46 F6.2 [yr-1] log(SFR/M*) Spectific star formation rate
48- 51 F4.2 [Msun] log(MD) Dust mass
53- 57 F5.2 [-] log(MD/M*) Dust to stellar mass ratio
59- 62 F4.2 --- fmu Fraction of total dust luminosity
contributed by the diffuse interstellar
medium (1)
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Note (1): Large values indicate that dust is heated by the old stellar
populations, while lower values suggest that ongoing star formation has a
more prominent role in heating the dust.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 26-Sep-2016