Evidence for major mergers of galaxies at 2 ≲ z < 4 in the VVDS and VUDS surveys

L. A. M. Tasca; O. Le Fèvre; C. López-Sanjuan; P.-W. Wang; P. Cassata; B. Garilli; O. Ilbert; V. Le Brun; B. C. Lemaux; D. Maccagni; L. Tresse; S. Bardelli; T. Contini; S. Charlot; O. Cucciati; A. Fontana; M. Giavalisco; J.-P. Kneib; M. Salvato; Y. Taniguchi; D. Vergani; G. Zamorani; E. Zucca

doi:10.1051/0004-6361/201321507

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Volume 565 (May 2014)

A&A, 565 (2014) A10

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Table 1

Pair properties.

Field	Pair galaxies	Redshift	Stellar masses¹	Mass ratio²	Flux ratio³	r _p ⁴	Δv ⁵	T _merg ⁶	z _assembly ⁷
	ID numbers	z ₁	10¹⁰ M_⊙			h^-1 kpc	km s^-1	Gyr

COSMOS	511001467 a&b	2.0970	0.3/0.15	2.0	1.9 ± 0.2	18.4 ± 0.3	87	2.3	1.1
	510788270 a&b	2.9629	0.5/0.7	1.4	1.7 ± 0.3	15.4 ± 0.2	38	1.5	1.8
	510175610/510778438	3.0939	0.8/5.0	6.3	4.2 ± 0.2	9.4 ± 0.2	161	0.7	2.3

VVDS-02h	520452183/520450423	1.8370	5.6/3.0	1.9	2.2 ± 0.1	22.3 ± 1.2	390	1.1	1.3
	520478238/520478087	2.2460	2.0/1.0	2.0	1.8 ± 0.4	25.3 ± 1.2	28	1.8	1.3
	910260902/910261083	2.3594	3.4/7.9	2.3	2.0 ± 0.1	12.3 ± 1.1	54	0.6	1.9
	910302317/910302929	1.8171	1.1/1.8	1.6	1.4 ± 0.1	8.7 ± 1.2	181	0.6	1.5

ECDFS	530034527 a&b	3.6500	1.2/0.9	1.3	1.5 ± 0.1	6.6 ± 0.2	0	0.5	2.9
	530050663 a&b	2.3250	0.4/0.2	2.0	1.9 ± 0.2	5.5 ± 0.3	54	0.6	1.9
	530042814/530042840	2.9903	0.12/0.1	1.2	1.3 ± 0.1	6.0 ± 0.2	278	1.0	2.1
	530046916 a&b	2.8684	1.4/0.6	2.3	2.5 ± 0.1	6.5 ± 0.2	279	0.5	2.4
	530036900 a&b	3.3300	1.3/1.1	1.2	1.5 ± 0.1	7.0 ± 0.2	76	0.6	2.6

Notes. errors in Δv are estimated to be <100 km s^-1 when the two redshifts are from the same slit (10 pairs), and ~200 km s^-1 when redshifts are from two different slits (2 pairs);

⁽¹⁾

Stellar mass estimates from SED fitting;

⁽²⁾

stellar mass ratio between the two galaxies in the pair, errors on the mass ratio have been computed from the error on the ratio of the H or K band flux measurements (see text);

⁽³⁾

flux ratio as measured on H or K-band;

⁽⁴⁾

r_p: transverse separation between the two galaxies in the pair, errors in r_p have been conservatively estimated taking a one pixel error on the difference in the centroid measurement of each galaxy in the pair;

⁽⁵⁾

Δv: velocity separation along the line of sight;

⁽⁶⁾

T_merg: time scale for the pair to merge, using the Kitzbichler & White (2008) prescription; from errors in mass ratio, r_p and Δv errors on T_merg are ~10−20%;

⁽⁷⁾

z_assembly: redshift by which the two galaxies will have merged, obtained combining the observed redshift and the Δz corresponding to the merger time scale.

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