Extranuclear Hα-emitting complexes in low-z (U)LIRGs: precursors of tidal dwarf galaxies?

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Volume 538 (February 2012)

A&A, 538 (2012) A61

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Table 3

Derived characteristics of the stellar populations and dynamics of the identified star-forming complexes.

IRAS	Complex	Age_phot	Age_EW	A_V	M _[I]	M _{[H_α]}	Age_Cyoung	A_V _C	M _Cold	M _Cyoung	M _dyn			M_dyn/M_tidal	v _esc	\|v_esc\|/v_rel
	Number	(Myr)	(Myr)	(mags)			(Myr)	(mags)						(km s^-1)
(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)	(11)	(12)	(13)	(14)	(15)	(16)	(17)

04315-0840	1	3.4	6.0	1.7 ± 0.3	4.9 ± 0.1	5.4 ± 0.3	2.1	0.2 ± 0.4	5.8 ± 0.1	3.8 ± 0.1	7.5 ± 0.3	6.6 ± 0.3	...	8.1	224	8.6
	2	4.0	10.0	1.5 ± 0.4	4.2 ± 0.2	5.8 ± 0.5	2.8	0.7 ± 0.5	5.5 ± 0.2	3.5 ± 0.2	7.8 ± 0.3	6.0 ± 0.3	...	>10	235	2.3
06076-2139	1	2.9	5.4	1.1 ± 0.3	5.4 ± 0.2	5.9 ± 0.2	...	...	...	...	8.0 ± 0.5	5.8 ± 0.2	...	>10	96	0.2
	2	3.0	6.0	1.0 ± 0.4	4.9 ± 0.2	5.4 ± 0.3	...	...	...	...	8.0 ± 0.3	5.7 ± 0.2	...	>10	96	0.2
	3	4.4	6.4	0.6 ± 0.3	4.6 ± 0.1	5.1 ± 0.2	2.9	0.0 ± 0.0	5.6 ± 0.1	3.6 ± 0.1	7.9 ± 0.3	4.5 ± 0.2	...	>10	92	0.2
	4	3.0	6.5	0.8 ± 0.4	4.5 ± 0.2	5.0 ± 0.5	...	...	...	...	8.0 ± 0.3	4.5 ± 0.2	...	>10	93	0.2
	5	2.9	6.8	0.4 ± 0.2	4.4 ± 0.2	5.1 ± 0.4	...	...	...	...	7.6 ± 0.4	4.3 ± 0.2	...	>10	97	0.2
	6	2.8	7.0	1.0 ± 0.3	5.2 ± 0.1	5.9 ± 0.8	...	...	...	...	...	5.0 ± 0.2	...	...	103	0.2
07027-6011 S	1	2.1	5.0	1.2 ± 0.3	4.9 ± 0.2	5.6 ± 0.3	...	...	...	...	7.9 ± 0.4	6.1 ± 0.3	...	>10	180	7.5
	2	3.2	...	0.6 ± 0.3	4.5 ± 0.1	4.6 ± 0.2	...	...	...	...	...	5.6 ± 0.3	...	...	125	1.7
08572+3915 N	1	2.8	5.2	0.7 ± 0.3	5.4 ± 0.2	5.9 ± 0.2	...	...	...	...	8.7 ± 0.3	7.2 ± 0.4	7.4 ± 0.3	>10	233	1.2
08572+3915 SE	3	4.9	...	0.9 ± 0.3	5.1 ± 0.1	5.1 ± 0.2	3.1	0.0 ± 0.6	6.1 ± 0.2	4.1 ± 0.2	...	6.6 ± 0.4	6.6 ± 0.3	...	225	0.99
	4	4.9	6.9	1.4 ± 0.4	5.5 ± 0.2	6.1 ± 0.2	3.2	0.6 ± 0.5	6.5 ± 0.2	4.5 ± 0.2	...	6.3 ± 0.4	6.5 ± 0.3	...	207	...
F10038-3338	3	3.6	...	0.7 ± 0.3	4.4 ± 0.1	4.5 ± 0.1	2.7	0.0 ± 0.0	5.7 ± 0.1	3.7 ± 0.1	7.6 ± 0.3	5.8 ± 0.3	...	>10	117	3.6
	4	4.9	...	0.9 ± 0.3	5.0 ± 0.1	5.2 ± 0.1	3.0	0.0 ± 0.6	6.0 ± 0.2	4.0 ± 0.2	8.2 ± 0.3	5.6 ± 0.3	...	>10	113	26.2
12112+0305	1	3.4	5.2	2.2 ± 0.3	7.1 ± 0.2	7.3 ± 0.2	2.2	0.8 ± 0.4	8.0 ± 0.1	6.0 ± 0.1	9.4 ± 0.2	9.2 ± 0.3	9.6 ± 0.2	0.7	496	5.1
	4	2.1	6.3	1.1 ± 0.3	5.4 ± 0.2	6.1 ± 0.3	...	...	...	...	...	6.2 ± 0.3	6.7 ± 0.2	...	275	1.03
14348-1447	1	3.3	5.5	4.2 ± 0.3	7.7 ± 0.1	8.1 ± 0.2	1.5	2.5 ± 0.3	8.5 ± 0.1	6.5 ± 0.1	9.3 ± 0.2	9.1 ± 1.1	9.2 ± 0.3	1.3	575	5.4
15250+3609	1	5.4	5.2	2.4 ± 0.3	6.6 ± 0.1	6.7 ± 0.2	3.9	1.1 ± 0.4	7.5 ± 0.1	5.5 ± 0.1	9.3 ± 0.3	7.7 ± 0.2	...	>10	214	1.7
F18093-5744 N	3	2.9	7.2	1.9 ± 0.3	5.0 ± 0.2	5.8 ± 0.5	...	...	...	...	7.9 ± 0.4	4.1 ± 0.1	5.1 ± 0.2	>10	220	4.6
F18093-5744 C	1	3.5	6.2	1.6 ± 0.3	4.8 ± 0.1	5.2 ± 0.3	2.4	0.4 ± 0.4	5.7 ± 0.1	3.7 ± 0.1	7.6 ± 0.5	3.6 ± 0.3	5.6 ± 0.2	>10	175	1.5
23128-5919	1	3.3	6.3	1.8 ± 0.3	5.7 ± 0.2	6.1 ± 0.5	2.0	0.3 ± 0.4	6.5 ± 0.2	4.5 ± 0.2	9.0 ± 0.2	7.1 ± 0.2	7.0 ± 0.3	>10	222	85.7

16007+3743	R1	...	7.1	1.7	8.8	...	...	...	...	...	9.8	8.2	8	>10	302	7.4
	R2	...	5.4	1.2	8.8	...	...	...	...	...	10	9.2	10.1	0.9	408	4.4
	R3	...	6.4	2.3	7.8	...	...	...	...	...	10.1	10	9.1	1.2	519	1.5

Notes. Column (1): object designation as in Table 1. Column (2): identified complex. Column (3): age of the young population, derived using the photometric information (Fig. 6). Column (4): age of the young population using the EW (Hα). Column (5): internal extinction. Column (6): derived mass of the young population using the I magnitude. All masses in the table are given in log (M (M_⊙ )). Column (7): derived mass of the young population using the Hα flux. Column (8): derived age of the young component, assuming that the candidate consists of a composite population. Column (9): derived internal extinction of the composite population. Column (10): derived mass of the old population (i.e., 1 Gyr), assuming a composite population (see text). Column (11): derived mass of the estimated young population, assuming a composite population. Column (12): dynamical mass. Column (13): tidal mass assuming the potential is created by the nearest galaxy. Column (14): tidal mass assuming the potential is created by a point mass at the mass center of the system. Column (15): ratio of the dynamical to the tidal mass. Column (16): escape velocity. Column (17): ratio of the escape to the relative velocity.

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