J/MNRAS/500/1323 Properties of the Hydra cluster galaxies (Lima-Dias+, 2021)
An environmental dependence of the physical and structural properties in the
Hydra cluster galaxies.
Lima-Dias C., Monachesi A., Torres-Flores S., Cortesi A.,
Hernandez-Lang D., Barbosa C.E., Mendes de Oliveira C., Olave-Rojas D.,
Pallero D., Sampedro L., Molino A., Herpich F.R., Jaffe Y.L., Amorin R.,
Chies-Santos A.L., Dimauro P., Telles E., Lopes P.A.A., Alvarez-Candal A.,
Ferrari F., Kanaan A., Ribeiro T., Schoenell W.
<Mon. Not. R. Astron. Soc., 500, 1323-1339 (2021)>
=2021MNRAS.500.1323L 2021MNRAS.500.1323L (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxies ; Star Forming Region ;
Photometry, ugriz ; Photometry, narrow-band
Keywords: galaxies: clusters: general - galaxies: fundamental parameters -
galaxies: structure
Abstract:
The nearby Hydra cluster (∼50Mpc) is an ideal laboratory to
understand, in detail, the influence of the environment on the
morphology and quenching of galaxies in dense environments. We study
the Hydra cluster galaxies in the inner regions (1R200) of the
cluster using data from the Southern Photometric Local Universe
Survey, which uses 12 narrow and broad-band filters in the visible
region of the spectrum. We analyse structural (Sersic index, effective
radius) and physical (colours, stellar masses, and star formation
rates) properties. Based on this analysis, we find that ∼88 per cent
of the Hydra cluster galaxies are quenched. Using the
Dressler-Schectman test approach, we also find that the cluster shows
possible substructures. Our analysis of the phase-space diagram
together with density-based spatial clustering algorithm indicates
that Hydra shows an additional substructure that appears to be in
front of the cluster centre, which is still falling into it. Our
results, thus, suggest that the Hydra cluster might not be relaxed. We
analyse the median Sersic index as a function of wavelength and find
that for red [(u-r)≥2.3] and early-type galaxies it displays a slight
increase towards redder filters (13 and 18 per cent, for red and early
type, respectively), whereas for blue + green [(u-r)<2.3] galaxies it
remains constant. Late-type galaxies show a small decrease of the
median Sersic index towards redder filters. Also, the Sersic index of
galaxies, and thus their structural properties, do not significantly
vary as a function of clustercentric distance and density within the
cluster; and this is the case regardless of the filter.
Description:
Observations of the Hydra cluster were taken as part of the S-PLUS
using the T80Cam installed at the 80cm T80-South telescope located at
Cerro Tololo Inter-American Observatory, Chile. The T80Cam has a
detector with 9232x9216 10m-pixels with an effective field of view of
2deg2 and plate-scale of 0.55arcsec/pixel. S-PLUS uses the
Javalambre 12-band filter system composed of five broad filters (u',
g', r', i' and z' - ugriz for simplicity) and seven narrow-band ones
(J0378, J0395, J0410, J0430, J0515, J0660, and J0861) strategically
positioned in regions of the electromagnetic spectrum that have
important stellar features such as [OII], Hα, Hδ, Mgb, and
Ca triplets.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 261 81 Magnitudes estimated in this work using
MegaMorph project
tablea2.dat 326 81 Sersic index estimated in this work using
MegaMorph project
tablea3.dat 149 81 Physical parameters of the galaxies
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.7 deg RAdeg Right ascension (J2000)
13- 23 F11.7 deg DEdeg Declination (J2000)
25- 31 F7.4 mag umag u-band magnitude (1)
33- 42 F10.8 mag e_umag Error on umag
44- 50 F7.4 mag J0378mag J0378-band magnitude (1)
52- 61 F10.8 mag e_J0378mag Error on J0378mag
63- 69 F7.4 mag J0395mag J0395-band magnitude (1)
71- 80 F10.8 mag e_J0395mag Error on J0395mag
82- 88 F7.4 mag J0410mag J0410-band magnitude (1)
90- 99 F10.8 mag e_J0410mag Error on J0410mag
101- 107 F7.4 mag J0430mag J0430-band magnitude (1)
109- 118 F10.8 mag e_J0430mag Error on J0430mag
120- 126 F7.4 mag gmag g-band magnitude (1)
128- 138 F11.9 mag e_gmag Error on gmag
140- 146 F7.4 mag J0515mag J0515-band magnitude (1)
148- 158 F11.9 mag e_J0515mag Error on J0515mag
160- 166 F7.4 mag rmag r-band magnitude (1)
168- 178 F11.9 mag e_rmag Error on rmag
180- 186 F7.4 mag J0660mag J0660-band magnitude (1)
188- 198 F11.9 mag e_J0660mag Error on J0660mag
200- 206 F7.4 mag imag i-band magnitude (1)
208- 218 F11.9 mag e_imag Error on imag
220- 226 F7.4 mag J0861mag J0861-band magnitude (1)
228- 237 F10.8 mag e_J0861mag Error on J0861mag
239- 245 F7.4 mag zmag z-band magnitude (1)
247- 257 F11.9 mag e_zmag Error on zmag
259- 261 F3.1 --- Sep Separation
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Note (1): Magnitudes aren't corrected for Galactic extinction. See Table 1 of
the article for more information on the S-PLUS filter system.
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 11 F11.7 deg RAdeg Right ascension (J2000)
13- 23 F11.7 deg DEdeg Declination (J2000)
25- 38 F14.11 --- nu Sersic index in the u-band
40- 48 F9.7 --- e_nu Error on nu
50- 62 F13.11 --- nJ0378 Sersic index in the J0378-band
64- 72 F9.7 --- e_nJ0378 Error on nJ0378
74- 86 F13.11 --- nJ0395 Sersic index in the J0395-band
88- 97 F10.8 --- e_nJ0395 Error on nJ0395
99- 111 F13.11 --- nJ0410 Sersic index in the J0410-band
113- 122 F10.8 --- e_nJ0410 Error on nJ0410
124- 136 F13.11 --- nJ0430 Sersic index in the J0430-band
138- 147 F10.8 --- e_nJ0430 Error on nJ0430
149- 161 F13.11 --- ng Sersic index in the g-band
163- 172 F10.8 --- e_ng Error on ng
174- 186 F13.11 --- nJ0515 Sersic index in the J0515-band
188- 197 F10.8 --- e_nJ0515 Error on nJ0515
199- 211 F13.11 --- nr Sersic index in the r-band
213- 222 F10.8 --- e_nr Error on nr
224- 236 F13.11 --- nJ0660 Sersic index in the J0660-band
238- 247 F10.8 --- e_nJ0660 Error on nJ0660
249- 261 F13.11 --- ni Sersic index in the i-band
263- 272 F10.8 --- e_ni Error on ni
274- 286 F13.11 --- nJ0861 Sersic index in the J0861-band
288- 297 F10.8 --- e_nJ0861 Error on nJ0861
299- 311 F13.11 --- nz Sersic index in the z-band
313- 322 F10.8 --- e_nz Error on nz
324- 326 F3.1 --- Sep Separation
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Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
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1- 11 F11.7 deg RAdeg Right ascension (J2000)
13- 23 F11.7 deg DEdeg Declination (J2000)
25- 42 F18.15 [Msun] logM* Logarithm of the stellar mass (1)
44- 63 F20.18 [Msun] e_logM* Error on logM*
65- 86 E22.17 10-7W LHa Hα luminosity
88- 109 E22.17 10-7W e_LHa Error on LHa
111- 129 F19.15 [yr-1] logsSFR ?=0 Logarithm of the specific star formation
rate
131- 149 F19.17 [yr-1] e_logsSFR ?=0 Error on logsSFR
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Note (1): The stellar mass calculated with the colour (g-i) presented in
Taylor et al. (2011MNRAS.418.1587T 2011MNRAS.418.1587T)
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 02-Oct-2023