2015MNRAS.454.3912L

Query : 2015MNRAS.454.3912L

2015MNRAS.454.3912L - Mon. Not. R. Astron. Soc., 454, 3912-3919 (2015/December-3)

Old age and supersolar metallicity in a massive z ∼ 1.4 early-type galaxy from VLT/X-Shooter spectroscopy.

LONOCE I., LONGHETTI M., MARASTON C., THOMAS D., MANCINI C., CIMATTI A., CIOCCA F., CITRO A., DADDI E., DI SEREGO ALIGHIERI S., GARGIULO A., MAIOLINO R., MANNUCCI F., MORESCO M., POZZETTI L., QUAI S. and SARACCO P.

Abstract (from CDS):

We present the first estimate of age, stellar metallicity and chemical abundance ratios, for an individual early-type galaxy at high-redshift (z = 1.426) in the COSMOS (Cosmological Evolution Survey) field. Our analysis is based on observations obtained with the X-Shooter instrument at the Very Large Telescope (VLT), which cover the visual and near-infrared spectrum at high (R > 5000) spectral resolution. We measure the values of several spectral absorptions tracing chemical species, in particular magnesium and iron, besides determining the age-sensitive D4000 break. We compare the measured indices to stellar population models, finding good agreement. We find that our target is an old (t > 3 Gyr), high-metallicity ([Z/H] > 0.5) galaxy which formed its stars at zform >5 within a short time-scale ∼ 0.1 Gyr, as testified by the strong [α/Fe] ratio (>0.4), and has passively evolved in the first >3-4 Gyr of its life. We have verified that this result is robust against the choice and number of fitted spectral features, and stellar population model. The result of an old age and high-metallicity has important implications for galaxy formation and evolution confirming an early and rapid formation of the most massive galaxies in the Universe.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: high-redshift - galaxies: stellar content

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 COSMOS2015 562612 G 10 02 35.6370 +02 09 14.365 27.19 26.118 25.25 24.65 23.14 ~ 13 0

Query : 2015MNRAS.454.3912L

Basic data :
COSMOS2015 562612 -- Galaxy
Other object types: otypes_help 		G (2012ApJ,COSMOS,...), NIR (UVISTADR1)
ICRS coord. (ep=J2000) : 		10 02 35.6370 +02 09 14.365 (Near-IR) [ ] C 2012ApJ...755...26O
FK4 coord. (ep=B1950 eq=1950) : 		10 00 00.5788 +02 23 45.125 [ ]
Gal coord. (ep=J2000) : 		237.2959537 +42.5213673 [ ]
Radial velocity / Redshift / cz : 		V(km/s) 212899 [267] / z(absorption) 1.42904 [0.00089] / cz 428415.4 [266.8]
   (Opt) C 2012ApJ...755...26O
Angular size (arcmin): 		1.44 1.44 0 (~) D 2010MNRAS.401..933M
Fluxes (10) :
U (AB) 27.19 [0.25] D 2013A&A...556A..55I
B (AB) 26.118 [0.147] C 2007ApJS..172...99C
V (AB) 25.25 [0.07] C 2013A&A...556A..55I
R (AB) 24.65 [0.04] C 2013A&A...556A..55I
I (AB) 23.14 [0.02] C 2013A&A...556A..55I
J (AB) 20.760 [0.004] B 2013A&A...556A..55I
H (AB) 20.236 [0.004] B 2013A&A...556A..55I
K (AB) 19.731 [0.003] B 2013A&A...556A..55I
i (AB) 22.87 [~] D 2018ApJ...858...77H
z (AB) 22.06 [0.03] D 2012ApJ...755...26O
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Identifiers (10) :
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COSMOS2015 562612 HSCS J100235.63+020914.3 [HCS2018] J150.6484+02.1540 [ORC2012] 307881
COSMOS 1511641 UVISTADR1 J100235.63+020914.3 [MDR2010] 307881
COSMOS J100235.64+020914.5 zCOSMOS 307881 [MMS2013] 83088

References (13 between 1850 and 2026) (Total 13)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Velocities : 4   

   

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Data at NED - NASA/IPAC Extragalactic Database : COSMOS2015 562612

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COSMOS 1511641

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