2011ApJ...730..130D

Query : 2011ApJ...730..130D

2011ApJ...730..130D - Astrophys. J., 730, 130 (2011/April-1)

The dirt on dry mergers.

DESAI V., DEY A., COHEN E., LE FLOC'H E. and SOIFER B.T.

Abstract (from CDS):

Using data from the Spitzer Space Telescope, we analyze the mid-infrared (3-70 µm) spectral energy distributions of dry merger candidates in the Boötes field of the NOAO Deep Wide-Field Survey. These candidates were selected by previous authors to be luminous, red, early-type galaxies with morphological evidence of recent tidal interactions. We find that a significant fraction of these candidates exhibit 8 and 24 µm excesses compared to expectations for old stellar populations. We estimate that a quarter of dry merger candidates have mid-infrared-derived star formation rates greater than ∼1 M☉/yr. This represents a "frosting" on top of a large old stellar population, and has been seen in previous studies of elliptical galaxies. Further, the dry merger candidates include a higher fraction of star-forming galaxies relative to a control sample without tidal features. We therefore conclude that the star formation in these massive ellipticals is likely triggered by merger activity. Our data suggest that the mergers responsible for the observed tidal features were not completely dry, and may be minor mergers involving a gas-rich dwarf galaxy.

Abstract Copyright: ∼

Journal keyword(s): galaxies: active - galaxies: evolution - galaxies: formation - infrared: galaxies

Simbad objects: 55

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Number of rows : 55
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 SDSS J142503.46+343748.9 G 14 25 03.4658497680 +34 37 48.881691624       16.75 16.01 ~ 4 0
2 LEDA 3560699 rG 14 25 41.091 +34 54 47.13       16.53 15.77 ~ 6 1
3 [V2005b] 4-1190 G 14 25 43.6856716176 +34 17 02.639200884       16.63 15.87 ~ 2 0
4 [V2005b] 6-1676 G 14 25 55.0536489792 +35 32 17.389253508       16.14 15.45 ~ 4 0
5 LEDA 2065773 G 14 26 14.6521287624 +35 31 05.271420108       14.63 13.97 ~ 12 0
6 [V2005b] 2-368 G 14 26 15.5970097080 +32 54 26.858882088       16.41 15.72 ~ 2 0
7 2MASS J14263573+3449484 G 14 26 35.7367140864 +34 49 48.390863520       16.68 15.95 ~ 7 0
8 [V2005b] 4-1975 G 14 26 43.1936197056 +34 28 53.277373560       16.99 16.29 ~ 2 0
9 LEDA 3560813 G 14 27 03.2281930680 +34 51 34.702007508       15.37 14.67 ~ 8 0
10 [V2005b] 3-601 G 14 27 03.5009966904 +33 33 51.301509120       15.88 15.29 ~ 4 0
11 2MASX J14271949+3244292 G 14 27 19.4872154040 +32 44 28.855917168           ~ 4 0
12 SDSS J142744.06+345834.5 G 14 27 44.0638468944 +34 58 34.534068456       16.08 15.40 ~ 5 0
13 LEDA 2005200 G 14 27 53.9 +32 37 16           ~ 5 0
14 [V2005b] 7-4247 G 14 28 12.7823304360 +32 54 30.035040264       16.65 15.93 ~ 2 0
15 SDSS J142824.44+335738.1 G 14 28 24.4481804136 +33 57 38.139973164       16.47 15.75 ~ 4 0
16 2MASX J14282950+3329536 G 14 28 29.5403592240 +33 29 53.757651804       16.68 15.98 ~ 7 0
17 2MASS J14285465+3312124 Sy2 14 28 54.65 +33 12 12.4       16.60 15.87 ~ 8 0
18 SDSS J142855.54+350456.4 G 14 28 55.5434887896 +35 04 56.505630324       15.79 14.71 ~ 8 0
19 [V2005b] 7-471 G 14 29 05.9428353360 +32 21 32.934489498           ~ 2 0
20 SDSS J142909.66+345212.7 G 14 29 09.660 +34 52 12.75       16.31 14.37 ~ 3 0
21 [V2005b] 10-112 G 14 29 12.8437559952 +34 04 41.717539596       16.73 16.11 ~ 4 0
22 SDSS J142914.38+335923.7 G 14 29 14.3824987392 +33 59 23.645017788       15.20 14.47 ~ 6 0
23 FIRST J142919.1+334858 rG 14 29 19.1458138944 +33 48 57.944739996       15.41 15.70 ~ 5 1
24 [V2005b] 12-1734 G 14 29 28.20 +35 37 53.5           ~ 3 0
25 SDSS J142930.20+345723.6 G 14 29 30.2082987624 +34 57 23.667174216       15.61 15.02 ~ 5 0
26 2MASX J14300307+3406509 Sy2 14 30 03.1162346856 +34 06 51.129416304       16.67 16.04 ~ 14 1
27 [KEC2012] 217.615244+33.041646 G 14 30 27.6288974688 +33 02 29.769063792       16.71 16.10 ~ 3 0
28 LEDA 3561014 EmG 14 30 48.2779782312 +34 56 05.960181588   17.82 16.68 15.94 15.29 ~ 12 1
29 LEDA 2046070 rG 14 30 55.6261399296 +34 14 28.167664200       15.30 14.57 ~ 10 0
30 MCG+06-32-055 G 14 31 12.7395379656 +35 19 55.078314312   16   14.21 13.53 ~ 14 0
31 LEDA 99836 G 14 31 30.7543170312 +34 08 09.043644408       15.96 15.21 ~ 9 0
32 [V2005b] 14-1401 G 14 31 34.7950113912 +33 06 18.387236484       16.29 15.62 ~ 4 0
33 LEDA 2053230 G 14 31 53.9565222096 +34 42 10.196497944       14.99 14.38 ~ 7 0
34 LEDA 2053367 G 14 31 55.3123128024 +34 42 40.644592596       15.41 14.73 ~ 8 0
35 SDSS J143203.50+351623.4 G 14 32 03.5073272424 +35 16 23.472553404       16.26 15.61 ~ 3 0
36 NAME NOAO Deep Wide Field reg 14 32 05.75 +34 16 47.5           ~ 430 0
37 SDSS J143216.81+350248.8 rG 14 32 16.8191353080 +35 02 48.798195504       16.63 16.00 ~ 5 1
38 LEDA 2011742 G 14 32 29.1 +32 46 20           ~ 4 0
39 SDSS J143251.35+340726.4 G 14 32 51.3557849808 +34 07 26.482868832       16.48 15.75 ~ 4 0
40 [V2005b] 23-1585 G 14 33 12.1477534752 +35 30 04.738221720       16.23 15.54 ~ 2 0
41 LEDA 214288 G 14 33 27.0815583768 +34 43 42.061746504       15.59 14.92 ~ 8 0
42 [V2005b] 22-2252 EmG 14 33 37.4685940608 +34 58 23.088825516       17.06 16.37 ~ 3 0
43 LEDA 2039091 rG 14 33 37.520 +33 48 13.56       15.87 15.16 ~ 9 1
44 SDSS J143351.60+341301.2 G 14 33 51.6006417168 +34 13 01.261380936       16.54 15.88 ~ 4 0
45 LEDA 3561242 G 14 33 56.7621364248 +34 09 00.892366920       16.74 16.12 ~ 6 0
46 SDSS J143429.72+334725.4 G 14 34 29.7285937896 +33 47 25.516293864       16.59 15.87 ~ 3 0
47 NVSS J143449+354246 rG 14 34 49.1023344072 +35 42 47.215558980       16.32 15.59 ~ 9 0
48 LAMOST J143541.78+330820.1 G 14 35 41.80 +33 08 20.1           ~ 5 0
49 [V2005b] 19-2242 G 14 35 42.3867628392 +33 08 22.102145844       16.65 15.93 ~ 5 0
50 SDSS J143610.15+352106.2 G 14 36 10.1560010688 +35 21 06.240064752       16.84 16.22 ~ 3 0
51 LEDA 2056629 G 14 36 41.9679463680 +34 55 14.419080588       16.32 15.23 ~ 5 0
52 FIRST J143707.0+341849 rG 14 37 07.01 +34 18 50.6       15.32 14.60 ~ 10 1
53 [V2005b] 27-3444 G 14 37 20.3260621536 +35 38 16.466933616       16.47 15.78 ~ 2 0
54 LEDA 3830207 rG 14 37 21.8554096176 +34 34 55.769661084       16.50 15.81 ~ 8 1
55 LEDA 2060433 G 14 38 08.3876414520 +35 10 00.424191108       16.11 15.46 ~ 4 0

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