J/MNRAS/491/398 Evolution of red spiral galaxies with GAMA (Mahajan+, 2020)
Galaxy And Mass Assembly (GAMA):
properties and evolution of red spiral galaxies.
Mahajan S., Gupta K.K., Rana R., Brown M.J.I., Phillipps S.,
Bland-Hawthorn J., Bremer M.N., Brough S., Holwerda B.W., Hopkins A.M.,
Loveday J., Pimbblet K., Wang L.
<Mon. Not. R. Astron. Soc., 491, 398-408 (2020)>
=2020MNRAS.491..398M 2020MNRAS.491..398M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, optical ; Galaxies, spectra ; Galaxies, photometry ;
Redshifts ; Colors
Keywords: galaxies: evolution - galaxies: fundamental parameters -
galaxies: star formation - galaxies: stellar content -
galaxies: structure
Abstract:
We use multiwavelength data from the Galaxy And Mass Assembly (GAMA)
survey to explore the cause of red optical colours in nearby
(0.002<z<0.06) spiral galaxies. We show that the colours of red spiral
galaxies are a direct consequence of some environment-related
mechanism(s) that has removed dust and gas, leading to a lower star
formation rate. We conclude that this process acts on long time-scales
(several Gyr) due to a lack of morphological transformation associated
with the transition in optical colour. The specific star formation
rate (sSFR) and dust-to-stellar mass ratio of red spiral galaxies is
found to be statistically lower than blue spiral galaxies. On the
other hand, red spirals are on average 0.9dex more massive, and reside
in environments 2.6 times denser than their blue counterparts. We find
no evidence of excessive nuclear activity, or higher inclination
angles to support these as the major causes for the red optical
colours seen in ≳47 per cent of all spirals in our sample.
Furthermore, for a small subsample of our spiral galaxies that are
detected in HI, we find that the SFR of gas-rich red spiral galaxies
is lower by ∼1dex than their blue counterparts.
Description:
In this paper, we utilize the r-band selected sample of galaxies from
the Galaxy and Mass Assembly (GAMA) survey (Driver et al.
2011MNRAS.413..971D 2011MNRAS.413..971D, Cat. J/MNRAS/413/971; Hopkins et al.
2013MNRAS.430.2047H 2013MNRAS.430.2047H; Liske et al. 2015MNRAS.452.2087L 2015MNRAS.452.2087L, Cat.
J/MNRAS/452/2087). GAMA is a multiwavelength campaign based on the
SDSS (Data Release 7) photometry, and has obtained spectra for ∼3
million galaxies with the AAOmega spectrograph on the Australian
Astronomical Telescope (AAT). This work is based on the data from the
three equatorial regions (G09, G12, and G15), covering 180deg2 on
the sky.
The matched aperture photometry for all galaxies in 21 wavebands is
obtained from the LambdarPhotometry DMU version 1 (Wright et al.
2016MNRAS.460..765W 2016MNRAS.460..765W). The Lambda Adaptive Multi-Band Deblending
Algorithm in R (LAMBDAR) calculates the matched aperture photometry
across images that are neither matched in pixel-scale nor point spread
function, using prior aperture definitions derived from
high-resolution optical imaging.
We have also made use of the Wide-field Infrared Survey Explorer
(WISE) photometry from WISEcatv02 (Cluver et al. 2014ApJ...782...90C 2014ApJ...782...90C)
for our sample.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 52 2512 The sky coordinates, z, (g-r) colour, ALFALFA ID
and HI mass of spiral galaxies used in this work
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See also:
J/MNRAS/474/3875 : Galaxy And Mass Assembly (GAMA): DR3 (Baldry+, 2018)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 7 I7 --- ID [7623/3913987] GAMA galaxy identifier
9- 15 F7.3 deg RAdeg Right ascension (J2000)
17- 22 F6.3 deg DEdeg Declination (J2000)
24- 28 F5.3 --- z Redshift
30- 35 F6.3 mag g-r g-r colour index
37- 42 I6 --- OName ? ALFALFA identifier
44- 52 E9.2 Msun MHI ? HI mass of the galaxy
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 10-Feb-2023