J/MNRAS/482/881 Post-starburst fraction and environment (Paccagnella+, 2019)
The strong correlation between post-starburst fraction and environment.
Paccagnella A., Vulcani B., Poggianti B.M., Moretti A., Fritz J.,
Gullieuszik M., Fasano G.
<Mon. Not. R. Astron. Soc., 482, 881-894 (2019)>
=2019MNRAS.482..881P 2019MNRAS.482..881P (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies
Keywords: galaxies: evolution - galaxies: formation - galaxies: general -
galaxies: groups: general
Abstract:
We examine a magnitude limited (MB=←18.7) sample of post-starburst
(PSB) galaxies at 0.03<z<0.11 in the different environments from the
spectroscopic data set of the Padova Millennium Galaxy Group Catalogue
and compare their incidence and properties with those of passive (PAS)
and emission line galaxies (EML). PSB galaxies have a quite precise
lifetime (<1-1.5Gyr), and they hold important clues for understanding
galaxy evolution. While the properties (stellar mass, absolute
magnitude, colour) of PSBs do not depend on environment, their
frequency increases going from single galaxies to binary systems to
groups, both considering the incidence with respect to the global
number of galaxies and to the number of currently+recently
star-forming galaxies. Including in our analysis, the sample of
cluster PSBs drawn from the WIde-field Nearby Galaxy-cluster Survey
presented in Paccagnella et al. (2017ApJ...838...14M 2017ApJ...838...14M), we extend the
halo mass range covered and present a coherent picture of the effect
of the environment on galaxy transformations. We find that the
PSB/(PSB+EML) fraction steadily increases with halo mass going from 1
per cent in 1011M☉ haloes to ∼15 per cent in the most massive
haloes (1015.5sun). This provides evidence that processes
specific to the densest environments, such as ram-pressure stripping,
are responsible for a large fraction of PSB galaxies in dense
environments. These processes act on a larger fraction of galaxies
than alternative processes leading to PSB galaxies in the sparsest
environments, such as galaxy interactions.
Description:
The main sample of this analysis is the PM2GC (Calvi et al.
2011MNRAS.416..727C 2011MNRAS.416..727C, Cat. J/MNRAS/416/727), a spectroscopically
complete sample of galaxies at 0.03<z<0.11 brighter than MB=-18.7.
The galaxy sample was built on the basis of the Millennium Galaxy
Catalogue (MGC) (Liske et al. 2003MNRAS.344..307L 2003MNRAS.344..307L; Cross et al.
2004MNRAS.349..576C 2004MNRAS.349..576C, Cat. VII/240; Driver et al. 2005MNRAS.360...81D 2005MNRAS.360...81D),
a deep and wide B-imaging survey (B<20) along an equatorial strip of
0.6degx73deg covering an area of ∼38deg2 obtained with the Isaac
Newton Telescope (INT) and consisting of 144 overlapping fields. A
sample of galaxies included in the MGCz catalogue, the spectroscopic
extension of the MGC, was selected. ∼86 per cent of the MGCz spectra
of the sample come from the SDSS (∼2.5Å resolution, median signal
to noise per pixel 15; Abazajian et al. 2003AJ....126.2081A 2003AJ....126.2081A), 12 per
cent from the 2dF Galaxy Redshift Survey (2dFGRS, ∼9Å resolution,
median signal-to-noise per pixel 13; Colless et al.
2001MNRAS.328.1039C 2001MNRAS.328.1039C, Cat. VII/250) and 2 per cent from the 2dF
follow-up obtained by the MGC team (Driver et al.
2005MNRAS.360...81D 2005MNRAS.360...81D).
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 36 176 Halo mass catalogue of 176 galaxy groups with
their properties
tablea2.dat 30 245 Halo mass catalogue of 245 binary systems with
their properties
tablea3.dat 20 1141 Halo mass catalogue of 1141 single galaxies with
their properties
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- ID PM2GC group serial number
([CPV2011] GRPM2 NNNN in Simbad)
6- 13 F8.4 deg RAdeg Right ascension (J2000) of the geometric centre
15- 21 F7.4 deg DEdeg Declination (J2000) of the geometric centre
23- 29 F7.4 [Msun] Mhalo Halo mass estimate
31- 36 F6.4 [Msun] e_Mhalo Error on Mhalo
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Byte-by-byte Description of file: tablea2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- ID PM2GC binary serial number
5- 9 I5 --- IDMGC1 PM2GC serial number of the first galaxy in the
system (MGC NNNNN in Simbad)
11- 15 I5 --- IDMGC2 PM2GC serial number of the second galaxy in the
system (MGC NNNNN in Simbad)
17- 23 F7.4 [Msun] Mhalo Halo mass estimate
25- 30 F6.4 [Msun] e_Mhalo Error on Mhalo
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Byte-by-byte Description of file: tablea3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- ID PM2GC galaxy serial number
(MGC NNNNN in Simbad)
7- 13 F7.4 [Msun] Mhalo Halo mass estimate
15- 20 F6.4 [Msun] e_Mhalo Error on Mhalo
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 23-Jun-2022