J/ApJ/762/77 PM2GC mass-limited sample surface photometry (Poggianti+, 2013)
Superdense galaxies and the mass-size relation at low redshift.
Poggianti B.M., Calvi R., Bindoni D., D'Onofrio M., Moretti A.,
Valentinuzzi T., Fasano G., Fritz J., De Lucia G., Vulcani B., Bettoni D.,
Gullieuszik M., Omizzolo A.
<Astrophys. J., 762, 77 (2013)>
=2013ApJ...762...77P 2013ApJ...762...77P
ADC_Keywords: Galaxies, spectra ; Morphology
Keywords: galaxies: clusters: general; galaxies: evolution;
galaxies: fundamental parameters; galaxies: structure
Abstract:
We search for massive and compact galaxies (superdense galaxies,
hereafter SDGs) at z=0.03-0.11 in the Padova-Millennium Galaxy and
Group Catalogue (PM2GC), a spectroscopically complete sample
representative of the general field population of the local universe.
We find that compact galaxies with radii and mass densities comparable
to high-z massive and passive galaxies represent 4.4% of all galaxies
with stellar masses above 3x1010M☉, yielding a number density
of 4.3x10-4h3/Mpc3. Most of them are S0s (70%) or ellipticals
(23%), are red, and have intermediate-to-old stellar populations, with
a median luminosity-weighted age of 5.4Gyr and a median mass-weighted
age of 9.2Gyr. Their velocity dispersions and dynamical masses are
consistent with the small radii and high stellar mass estimates.
Comparing with the WINGS sample of cluster galaxies at similar
redshifts, the fraction of SDGs is three times smaller in the field
than in clusters, and cluster SDGs are on average 4Gyr older than
field SDGs. We confirm the existence of a universal trend of smaller
radii for older luminosity-weighted ages at fixed galaxy mass. As a
consequence, the median mass-size relation shifts toward smaller radii
for galaxies with older stars, but the effect is much more pronounced
in clusters than in the field. Our results show that, on top of the
well-known dependence of stellar age on galaxy mass, the
luminosity-weighted age of galaxies depends on galaxy compactness at
fixed mass and, for a fixed mass and radius, on environment. This
effect needs to be taken into account in order not to overestimate the
evolution of galaxy sizes from high to low z. Our results and
hierarchical simulations suggest that a significant fraction of the
massive compact galaxies at high z have evolved into compact galaxies
in galaxy clusters today. When stellar age and environmental effects
are taken into account, the average amount of size evolution of
individual galaxies between high and low z is mild, a factor ∼1.6.
Description:
We draw our galaxy sample from PM2GC (Calvi et al. 2011,
Cat. J/MNRAS/416/727) consisting of a spectroscopically complete
sample of galaxies at 0.03≤z≤0.11 brighter than MB←18.7. This
sample is sourced from the Millennium Galaxy Catalogue (MGC; Liske et
al. 2003, Cat. VII/240), a B-band contiguous equatorial survey of
∼38deg2 complemented by a 96% spectroscopically complete survey down
to B=20. The image quality and the spectroscopic completeness are
superior to Sloan.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 25 995 Superdense galaxies at low redshift
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See also:
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
VII/240 : Millennium Galaxy Catalogue (Liske+, 2003)
J/MNRAS/420/926 : Morphology of galaxies in WINGS clusters (Fasano+, 2012)
J/MNRAS/416/727 : Padova-Millennium Galaxy and Group Catalogue (Calvi+, 2011)
J/MNRAS/413/813 : ATLAS3D project. I. (Cappellari+, 2011)
J/A+A/526/A45 : WINGS-SPE II catalog (Fritz+, 2011)
J/ApJ/739/L44 : Structural data for 0.2<z<2.7 galaxies (Damjanov+, 2011)
J/AJ/130/1516 : MCG pairs and triples of galaxies (De Propris+, 2005)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 5 I05 --- MGC [71/96964] PM2GC ID number (1)
7- 13 F7.3 pix Re Galaxy major axis radius (1pix=0.333arcsec)
15- 19 F5.3 --- n [0.5/8] Sersic index
21- 25 F5.3 --- b/a [0.1/1.3] Axial ratio
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Note (1): As in Calvi et al. (2011, Cat. J/MNRAS/416/727)
"MGC" from Liske et al. (2003, Cat. VII/240; in Simbad).
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History:
From electronic version of the journal
References:
Calvi et al. 2011MNRAS.416..727C 2011MNRAS.416..727C PM2GC catalogues of group, binary and
single field galaxies Cat. J/MNRAS/416/727
Calvi et al. 2012MNRAS.419L..14C 2012MNRAS.419L..14C PM2GC morphological catalog.
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 02-Sep-2014