J/MNRAS/475/788 GAMA blue spheroids within 87 Mpc (Mahajan+, 2018)
Galaxy And Mass Assembly (GAMA): blue spheroids within 87 Mpc.
Mahajan S., Drinkwater M.J., Driver S., Hopkins A.M., Graham A.W.,
Brough S., Brown M.J.I., Holwerda B.W., Owers M.S., Pimbblet K.A.
<Mon. Not. R. Astron. Soc., 475, 788-799 (2018)>
=2018MNRAS.475..788M 2018MNRAS.475..788M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies ; Morphology ; H I data
Keywords: galaxies: evolution - galaxies: fundamental parameters -
galaxies: star formation - galaxies: stellar content -
galaxies: structure
Abstract:
In this paper, we test if nearby blue spheroid (BSph) galaxies may
become the progenitors of star-forming spiral galaxies or passively
evolving elliptical galaxies. Our sample comprises 428 galaxies of
various morphologies in the redshift range 0.002<z<0.02 (8-87Mpc)
with panchromatic data from the Galaxy and Mass Assembly survey. We
find that BSph galaxies are structurally (mean effective surface
brightness, effective radius) very similar to their passively evolving
red counterparts. However, their star formation and other properties
such as colour, age, and metallicity are more like star-forming
spirals than spheroids (ellipticals and lenticulars). We show that
BSph galaxies are statistically distinguishable from other spheroids
as well as spirals in the multidimensional space mapped by
luminosity-weighted age, metallicity, dust mass, and specific star
formation rate. We use HI data to reveal that some of the BSphs are
(further) developing their discs, hence their blue colours. They may
eventually become spiral galaxies - if sufficient gas accretion occurs
- or more likely fade into low-mass red galaxies.
Description:
The sample used in this paper is the same as that used in Mahajan et
al. (2015MNRAS.446.2967M 2015MNRAS.446.2967M, hereafter Paper I), but with some of the
derived parameters updated in accordance with the latest versions of
the GAMA II catalogues (Liske et al. 2015MNRAS.452.2087L 2015MNRAS.452.2087L, Cat.
J/MNRAS/452/2087).
We present our complete sample of 428 galaxies (also used in Paper I,
Mahajan et al. (2015MNRAS.446.2967M 2015MNRAS.446.2967M) spanning the redshift range
0.002<z<0.02, and devoid of very high density environments.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 56 428 Complete sample of 428 galaxies
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See also:
J/MNRAS/452/2087 : Galaxy And Mass Assembly (GAMA): DR2 (Liske+, 2015)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 7 I7 --- GAMA GAMA ID
9- 13 F5.2 mag rmag r magnitude
16- 19 F4.2 mag e_rmag rms uncertainty on rmag
21- 22 I2 --- Morph Morphology (1)
24- 28 F5.3 --- z Redshift
31- 36 I6 --- ALFALFA ?=- ALFALFA ID
39- 43 F5.2 Jy.km/s SHI ?=- HI Flux
47- 50 F4.2 Jy.km/s e_SHI ?=- rms uncertainty on Si
52- 56 F5.2 [Msun] logMHI ?=- HI mass
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Note (1): Morphology classification as follows:
1 = Elliptical
2 = Spiral
3 = Irregular
5 = BSph
6 = LSB
11 = Lenticular
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 01-Apr-2021