J/MNRAS/457/3743 104 massive quiescent galaxies SFHs (Dominguez Sanchez+, 2016)
Pathways to quiescence: SHARDS view on the star formation histories of massive
quiescent galaxies at 1.0 < z < 1.5.
Dominguez Sanchez H., Perez-Gonzalez P.G., Esquej P., Eliche-Moral M.C.,
Barro G., Cava A., Koekemoer A.M., Alcalde Pampliega B., Alonso Herrero A.,
Bruzual G., Cardiel N., Cenarro J., Ceverino D., Charlot S.,
Hernan Caballero A.
<Mon. Not. R. Astron. Soc., 457, 3743-3768 (2016)>
=2016MNRAS.457.3743D 2016MNRAS.457.3743D (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, optical ; Photometry ; Stars, ages
Keywords: galaxies: evolution - galaxies: formation - galaxies: high-redshift -
galaxies: stellar content
Abstract:
We present star formation histories (SFHs) for a sample of 104 massive
(stellar mass M>1010M☉) quiescent galaxies (MQGs) at
z=1.0-1.5 from the analysis of spectrophotometric data from the
Survey for High-z Absorption Red and Dead Sources (SHARDS) and
HST/WFC3 G102 and G141 surveys of the GOODS-North field, jointly with
broad-band observations from ultraviolet (UV) to far-infrared
(far-IR). The sample is constructed on the basis of rest-frame UVJ
colours and specific star formation rates (sSFRs=SFR/Mass). The
spectral energy distributions (SEDs) of each galaxy are compared to
models assuming a delayed exponentially declining SFH. A Monte Carlo
algorithm characterizes the degeneracies, which we are able to break
taking advantage of the SHARDS data resolution, by measuring indices
such as MgUV and D4000. The population of MQGs shows a duality in
their properties. The sample is dominated (85 per cent) by galaxies
with young mass-weighted ages, <tM><2Gyr, short star formation
time-scales, <τ≳60-200MYr, and masses log(M/M☉)∼10.5.
There is an older population (15 per cent) with <tM≥2-4Gyr, longer
star formation time-scales, <τ≳400Myr, and larger masses,
log(M/M☉)∼10.7. The SFHs of our MQGs are consistent with the
slope and the location of the main sequence of star-forming galaxies
at z>1.0, when our galaxies were 0.5-1.0Gyr old. According to these
SFHs, all the MQGs experienced a luminous infrared galaxy phase that
lasts for ∼500Myr, and half of them an ultraluminous infrared galaxy
phase for ∼100Myr. We find that the MQG population is almost assembled
at z∼1, and continues evolving passively with few additions to the
population.
Description:
Our sample was selected in the 130 arcmin2 covered by SHARDS
(Perez-Gonzalez et al., 2013, Cat. J/ApJ/762/46) in the GOODS-N region.
We analyse the sample of MQGs (M>1010M☉) at 1.0<z<1.5 selected
with two different criteria: their rest-frame UVJ colours and their
specific star formation rate (sSFR).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 156 104 Galaxy properties for the sample of 104 galaxies
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See also:
J/ApJ/762/46 : SHARDS: GOODS-N spectrophotometry survey (Perez-Gonzalez+, 2013)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [SHARD]
6- 28 A23 --- SHARD SHARD name (HH:MM:SS.ss+DD:MM:SS.s)
30- 35 F6.4 --- z Redshift
37- 38 A2 --- n_z [zs zp] Redshift type
40- 43 F4.2 mag V-J V-J colour index
45- 48 F4.2 mag e_V-J rms uncertainty on V-J
50- 53 F4.2 mag U-V U-V colour index
55- 58 F4.2 mag e_U-V rms uncertainty on U-V
60- 64 F5.3 1/Gyr sSFR(IR+UV) Specific SFR used in the sample selection
(see Section 2.2)
66- 70 F5.3 1/Gyr e_sSFR(IR+UV) rms uncertainty on sSFR(IR+UV)
72- 76 F5.2 [Msun] logM Mass
78- 81 F4.2 [Msun] e_logM rms uncertainty on logM
83- 86 F4.2 Gyr t0 Best-fitting age
88- 91 F4.2 Gyr E_t0 Error on t0 (upper value)
93- 96 F4.2 Gyr e_t0 Error on t0 (lower value)
98-101 F4.2 Gyr tM Mass-weighted age
103-106 F4.2 Gyr E_tM Error on tM (upper value)
108-111 F4.2 Gyr e_tM Error on tM (lower value)
113-115 I3 Myr tau Star formation time-scale
117-119 I3 Myr E_tau Error on tau (upper value)
121-123 I3 Myr e_tau Error on tau (lower value)
125-128 F4.2 mag Av Dust attenuation
130-133 F4.2 mag e_Av rms uncertainty on Av
135-137 F3.1 [Sun] Z Metallicity
139-141 F3.1 [Sun] E_Z Error on Z (upper value)
143-145 F3.1 [Sun] e_Z Error on Z (lower value)
147-152 F6.3 Msun/yr SFR(SED) SFR from SED fitting
154-156 I3 % Signi Significance of the primary solution
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Nov-2016