2011ApJ...730..125Z

Query : 2011ApJ...730..125Z

2011ApJ...730..125Z - Astrophys. J., 730, 125 (2011/April-1)

HST/NICMOS imaging of bright high-redshift 24 µm selected galaxies: merging properties.

ZAMOJSKI M., YAN L., DASYRA K., SAJINA A., SURACE J., HECKMAN T. and HELOU G.

Abstract (from CDS):

We present new results on the physical nature of infrared-luminous sources at 0.5 < z < 2.8 as revealed by HST/NICMOS imaging and Infrared Spectrograph mid-infrared spectroscopy. Our sample consists of 134 galaxies selected at 24 µm with a flux of S(24 µm)>0.9 mJy. We find many (∼60%) of our sources to possess an important bulge and/or central point source component, most of which reveal additional underlying structures after subtraction of a best-fit Sérsic (or Sérsic+PSF) profile. Based on visual inspection of the NIC2 images and their residuals, we estimate that ∼80% of all our sources are mergers. We calculate lower and upper limits on the merger fraction to be 62% and 91%, respectively. At z < 1.5, we observe objects in early (pre-coalescence) merging stages to be mostly disk and star formation dominated, while we find mergers to be mainly bulge dominated and active galactic nucleus (AGN)-starburst composites during coalescence and then AGN dominated in late stages. This is analogous to what is observed in local ULIRGs. At z ≥ 1.5, we find a dramatic rise in the number of objects in pre-coalescence phases of merging, despite an increase in the preponderance of AGN signatures in their mid-IR spectra and luminosities above 1012.5 L☉. We further find the majority of mergers at those redshifts to retain a disk-dominated profile during coalescence. We conclude that, albeit still driven by mergers, these high-z ULIRGs are substantially different in nature from their local counterparts and speculate that this is likely due to their higher gas content. Finally, we observe obscured (τ_9.7 µm_>3.36) quasars to live in faint and compact hosts and show that these are likely high-redshift analogs of local dense-core mergers. We find late-stage mergers to possess predominantly unobscured AGN spectra, but do not observe other morphological classes to carry any specific combination of τ_9.7 µm_ and polycyclic aromatic hydrocarbon (PAH) equivalent width. This suggests a high degree of variation in the PAH emission and silicate absorption properties of these mergers, and possibly throughout the merging process itself.

Abstract Copyright: ∼

Journal keyword(s): galaxies: evolution - galaxies: high-redshift - infrared: galaxies

VizieR on-line data: <Available at CDS (J/ApJ/730/125): table5.dat>

Simbad objects: 159

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Number of rows : 159
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 IRAS 01003-2238 Sy2 01 02 49.9920152640 -22 21 57.262136544   18.62 18.9 17.83   ~ 164 0
2 Mrk 1014 Sy1 01 59 50.2534701768 +00 23 40.864244784   16.08 15.87     ~ 572 0
3 2MASX J02042730-2049413 G 02 04 27.3254183088 -20 49 41.237644872   17.45       ~ 40 0
4 IRAS 03521+0028 LIN 03 54 42.146 +00 37 03.33           ~ 93 0
5 LEDA 17155 Sy2 05 21 01.3994605776 -25 21 45.321827832   15.47 14.75     ~ 498 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17438 0
7 IRAS 07598+6508 Sy1 08 04 30.4643108040 +64 59 52.789588188   14.3 15.5     ~ 231 0
8 NAME IRAS F08572+3915 NW LIN 09 00 25.364 +39 03 54.23     16.66     ~ 420 1
9 2MASX J09063400+0451271 LIN 09 06 34.0537343016 +04 51 27.447987744           ~ 78 0
10 UGC 5101 Sy2 09 35 51.6045544584 +61 21 11.589382368   15.20 15.50     ~ 572 4
11 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2975 0
12 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1692 0
13 LEDA 39024 LIN 12 13 46.107 +02 48 41.50           ~ 354 1
14 Mrk 771 Sy1 12 32 03.6223710000 +20 09 29.495834136   15.57 15.30     ~ 495 0
15 Mrk 231 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 1989 3
16 LEDA 165618 Sy2 13 24 19.8862877976 +05 37 04.693531332   19.31 18.73 17.41   ~ 119 0
17 Mrk 273 Sy2 13 44 42.1781 +55 53 12.819   15.68 14.91     ~ 913 3
18 Mrk 463 Sy2 13 56 02.9 +18 22 18   14.8 14.22     ~ 390 2
19 LEDA 52270 Sy1 14 37 38.2867288488 -15 00 24.087592692   16.58 16.40     ~ 276 1
20 IRAS 15206+3342 Sy2 15 22 38.104 +33 31 35.90           ~ 101 0
21 2MASX J15265942+3558372 LIN 15 26 59.442 +35 58 37.01   15.61       ~ 272 1
22 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2961 4
23 SSTXFLS J171138.5+583836 G 17 11 38.520 +58 38 38.58       23.67   ~ 14 0
24 SSTXFLS24 J171204.6+601631 AGN 17 12 04.6853019096 +60 16 31.830377808       20.95   ~ 5 0
25 FLSVLA J171208.8+593025 G 17 12 08.847 +59 30 25.02       22.93   ~ 5 0
26 FLSVLA J171216.0+591121 G 17 12 16.056 +59 11 21.94       22.08   ~ 8 0
27 SSTXFLS24 J171216.4+595710 AGN 17 12 16.499 +59 57 11.05       20.51   ~ 10 0
28 FLSVLA J171218.9+601003 G 17 12 18.950 +60 10 03.36           ~ 7 0
29 FLSGMRT J171221.7+600331 G 17 12 21.71 +60 03 31.9       23.22   ~ 5 0
30 FLSVLA J171239.5+585954 G 17 12 39.577 +58 59 54.96       20.90   ~ 7 0
31 [DYH2009] MIPS 8071 AGN 17 12 43.5 +60 06 50       22.10   ~ 4 0
32 [DYH2009] MIPS 8465 G 17 13 01.8 +59 37 22       22.61   ~ 3 0
33 FLSGMRT J171302.0+595458 G 17 13 02.00 +59 54 58.1       24.23   ~ 5 0
34 [DYH2009] MIPS 544 G 17 13 07.7 +58 44 13       23.03   ~ 4 0
35 [MFA2007] 321 G 17 13 09.541 +60 08 16.05       21.64   ~ 9 0
36 SSTXFLS24 J171313.8+595506 AGN 17 13 13.8880926120 +59 55 06.100437540       20.11   ~ 5 0
37 SSTXFLS24 J171325.4+600720 QSO 17 13 25.439 +60 07 20.15       22.57   ~ 9 0
38 SSTXFLS24 J171329.8+594434 AGN 17 13 29.867 +59 44 34.00       20.89   ~ 6 0
39 [DYH2009] MIPS 8430 AGN 17 13 33.2 +60 10 19       22.03   ~ 6 0
40 FLSVLA J171333.5+592748 G 17 13 33.535 +59 27 48.09       22.08   ~ 3 0
41 [DYH2009] MIPS 213 G 17 13 35.7 +59 27 22       23.42   ~ 3 0
42 [WLH2006] 14 QSO 17 13 43.9 +59 57 15           ~ 18 0
43 SSTXFLS24 J171344.3+601531 AGN 17 13 44.290 +60 15 30.73       22.16   ~ 7 0
44 [YCA2005] IRS 9 G 17 13 50.00 +58 56 56.8       25.73   ~ 17 0
45 [DYH2009] MIPS 8315 G 17 13 57.0 +59 44 38       23.88   ~ 3 0
46 CXO J171400.5+601409 AGN 17 14 00.434 +60 14 09.55       21.42   ~ 7 0
47 [DYH2009] MIPS 184 G 17 14 04.5 +59 03 04       21.56   ~ 2 0
48 [DYH2009] MIPS 446 G 17 14 09.105 +59 17 48.33       21.82   ~ 4 0
49 [YSF2007] SST24 J171411.55+601109.3 G 17 14 11.450 +60 11 09.20       23.73   ~ 14 0
50 [LYA2005] 8185 G 17 14 22.85 +60 28 34.7       23.80   ~ 3 0
51 FLSVLA J171424.8+592948 AGN 17 14 24.872 +59 29 48.50       23.40   ~ 5 0
52 [DYH2009] MIPS 495 G 17 14 33.0 +58 58 20       21.84   ~ 3 0
53 [YSF2007] SST24 J171433.17+593911.2 G 17 14 33.190 +59 39 11.31       22.94   ~ 10 0
54 [DYH2009] MIPS 8375 G 17 14 33.761 +59 52 23.67       21.50   ~ 9 0
55 [YSF2007] SST24 J171439.57+585632.1 G 17 14 39.57 +58 56 32.1       23.77   ~ 10 0
56 FLSVLA J171440.8+595819 G 17 14 40.821 +59 58 19.66       22.83   ~ 9 0
57 [DYH2009] MIPS 298 G 17 14 48.9 +59 28 47       23.95   ~ 3 0
58 FLSVLA J171450.8+592633 G 17 14 50.862 +59 26 33.51       22.32   ~ 7 0
59 [YSF2007] SST24 J171456.24+583816.2 G 17 14 55.990 +58 38 16.44       22.46   ~ 7 0
60 [LYA2005] 8069 QSO 17 15 00.3772811064 +59 56 11.727982500   18.7 19.17 18.9   ~ 10 0
61 [DYH2009] MIPS 331 G 17 15 05.7 +59 18 20       22.04   ~ 3 0
62 [DYH2009] MIPS 397 G 17 15 05.9 +59 09 17       23.80   ~ 4 0
63 SSTXFLS24 J171507.8+601352 AGN 17 15 07.820 +60 13 52.56       21.78   ~ 12 0
64 [PCE2006] 4268 G 17 15 11.855 +58 49 34.59       21.16   ~ 5 0
65 SSTXFLS24 J171527.7+601731 G 17 15 27.703 +60 17 31.57       21.28   ~ 6 0
66 FLSVLA J171527.7+600726 G 17 15 27.759 +60 07 26.27       22.08   ~ 8 0
67 [YSF2007] SST24 J171535.78+602825.5 G 17 15 35.78 +60 28 25.5       23.50   ~ 12 0
68 [YSF2007] SST24 J171536.34+593614.8 G 17 15 36.34 +59 36 14.8       25.73   ~ 15 0
69 [YCA2005] IRS 2 QSO 17 15 38.244 +59 25 40.68       25.73   ~ 17 0
70 [YSF2007] SST24 J171543.54+583531.2 G 17 15 43.54 +58 35 31.2       24.02   ~ 8 0
71 [DYH2009] MIPS 419 G 17 15 45.2 +59 05 39       22.85   ~ 4 0
72 [DYH2009] MIPS 8413 G 17 15 45.7 +59 51 56           ~ 4 0
73 [DYH2009] MIPS 505 G 17 15 59.4 +59 27 33       24.91   ~ 3 0
74 [MFA2007] 561 G 17 16 06.772 +59 44 54.98       22.33   ~ 8 0
75 SSTXFLS24 J171607.9+600638 AGN 17 16 08.011 +60 06 38.83       21.83   ~ 9 0
76 [DYH2009] MIPS 8407 AGN 17 16 12.8 +60 19 49       24.26   ~ 4 0
77 FLSGMRT J171614.8+601332 AGN 17 16 14.89 +60 13 32.3       20.87   ~ 6 0
78 [MGC2004] J171623.281+593647.51 G 17 16 23.239 +59 36 46.87       21.73   ~ 6 0
79 [DYH2009] MIPS 8308 G 17 16 34.410 +60 15 43.80       20.29   ~ 5 0
80 [LYA2005] 8107 G 17 16 38.680 +59 49 43.70       22.17   ~ 8 0
81 [DYH2009] MIPS 8325 G 17 16 43.666 +60 20 13.82       21.05   ~ 5 0
82 [DYH2009] MIPS 8224 AGN 17 16 49.0 +59 53 36       23.53   ~ 3 0
83 [MGC2004] J171649.319+594918.91 AGN 17 16 49.319 +59 49 18.91       23.06   ~ 5 0
84 [MFA2007] 541 G 17 16 52.445 +59 35 32.09       22.07   ~ 9 0
85 FLSVLA J171655.7+591046 G 17 16 55.715 +59 10 46.15       23.21   ~ 6 0
86 SDSS J171655.79+592540.2 QSO 17 16 55.793 +59 25 40.26   22.14 21.17 20.54   ~ 7 0
87 [MFA2007] 490 G 17 16 59.158 +59 08 11.47       22.04   ~ 5 0
88 [PCE2006] 5461 QSO 17 17 08.668 +59 13 41.05   22.97 21.84 21.05   ~ 10 0
89 [PCE2006] 5488 QSO 17 17 15.706 +59 06 03.56   21.84 21.19 20.79   ~ 6 0
90 [MGC2004] J171731.685+594034.34 G 17 17 31.685 +59 40 34.34       21.92   ~ 5 0
91 [PCE2006] 6869 G 17 17 55.105 +59 28 45.33       20.18   ~ 9 0
92 [YSF2007] MIPS 42 QSO 17 17 58.6558730136 +59 28 14.202721344       25.73   ~ 12 0
93 SSTXFLS24 J171802.8+601522 G 17 18 02.845 +60 15 22.18       21.33   ~ 6 0
94 FLSGMRT J171804.9+600833 G 17 18 04.990 +60 08 32.28       23.48   ~ 13 0
95 [MFA2007] 483 G 17 18 07.161 +59 29 37.57       22.24   ~ 9 0
96 [FCY2004] 1 G 17 18 12.574 +59 39 22.91       20.65   ~ 9 0
97 [DYH2009] MIPS 22527 G 17 18 15.5 +59 12 01       22.87   ~ 2 0
98 [YSF2007] SST24 J171819.64+590242.6 G 17 18 19.630 +59 02 42.68       25.73   ~ 6 0
99 FLSVLA J171825.8+595353 G 17 18 25.893 +59 53 54.21       21.38   ~ 6 0
100 FIRST J171826.7+584241 AG? 17 18 26.7012 +58 42 41.818       23.23   ~ 13 0
101 FLSVLA J171834.9+594533 AGN 17 18 34.937 +59 45 34.02       20.72   ~ 9 0
102 [YCA2005] IRS 1 QSO 17 18 44.380 +59 20 00.73       22.48   ~ 25 0
103 [YSF2007] MIPS 16080 IR 17 18 44.799 +60 01 15.69       23.09   ~ 17 0
104 [YSF2007] SST24 J171848.80+585115.1 G 17 18 48.80 +58 51 15.1       24.91   ~ 13 0
105 FLSGMRT J171855.6+594545 G 17 18 55.684 +59 45 45.54       23.10   ~ 11 0
106 [DYH2009] MIPS 22725 G 17 19 03.769 +59 26 57.44       22.80   ~ 3 0
107 [DYH2009] MIPS 16267 G 17 19 10.3 +60 13 16       24.36   ~ 3 0
108 [DYH2009] MIPS 15871 G 17 19 17.3 +59 29 29       23.26   ~ 2 0
109 FLSGMRT J171917.3+601520 G 17 19 17.428 +60 15 19.59       22.49   ~ 11 0
110 FLSVLA J171918.6+590042 G 17 19 18.638 +59 00 42.53       20.87   ~ 7 0
111 [YSF2007] MIPS 15840 QSO 17 19 22.40 +60 05 00.3       24.74   ~ 10 0
112 [LYA2005] 15690 G 17 19 22.432 +60 14 55.98       22.20   ~ 6 0
113 [PCE2006] 6459 G 17 19 24.653 +59 28 58.95       20.93   ~ 4 0
114 [YSF2007] MIPS 22651 G 17 19 26.540 +59 09 29.12       25.73   ~ 11 0
115 [DYH2009] MIPS 16099 G 17 19 37.5 +60 01 25       23.11   ~ 4 0
116 FLSVLA J171949.0+585410 G 17 19 49.004 +58 54 10.26           ~ 4 0
117 [PCE2006] 7184 G 17 19 51.461 +58 42 22.85       20.50   ~ 6 0
118 [DYH2009] MIPS 22248 G 17 20 03.6 +59 19 08       21.98   ~ 3 0
119 [LYA2005] 22397 G 17 20 05.96 +59 17 45.0       23.12   ~ 5 0
120 [DYH2009] MIPS 15771 G 17 20 11.4 +59 36 01       24.00   ~ 3 0
121 [DYH2009] MIPS 16219 G 17 20 13.2 +60 10 28       22.88   ~ 3 0
122 FLSVLA J172016.9+592733 G 17 20 16.947 +59 27 33.54       22.20   ~ 4 0
123 [DYH2009] MIPS 22557 G 17 20 25.519 +59 13 58.81       20.88   ~ 5 0
124 [YSF2007] MIPS 22558 QSO 17 20 45.17 +58 52 21.4       23.90   ~ 19 0
125 [YSF2007] SST24 J172047.47+590815.1 G 17 20 47.520 +59 08 14.71       25.73   ~ 9 0
126 [LYA2005] 15776 G 17 20 50.704 +59 32 54.63       22.19   ~ 7 0
127 [YSF2007] MIPS 16122 G 17 20 51.48 +60 01 49.1       24.35   ~ 15 0
128 [DYH2009] MIPS 22635 G 17 20 55.0 +59 10 40       22.64   ~ 5 0
129 [DYH2009] MIPS 16132 G 17 21 08.3 +59 54 16       22.00   ~ 2 0
130 FLSVLA J172108.2+590115 G 17 21 08.428 +59 01 15.12           ~ 6 0
131 [YSF2007] SST24 J172109.22+601501.3 G 17 21 09.210 +60 15 01.66       23.14   ~ 13 0
132 [YSF2007] SST24 J172119.46+595817.2 G 17 21 19.30 +59 58 16.8       23.81   ~ 13 0
133 [YSF2007] SST24 J172126.42+601646.1 G 17 21 26.470 +60 16 46.27       23.87   ~ 10 0
134 FLSVLA J172131.0+584248 G 17 21 31.072 +58 42 48.69       23.71   ~ 4 0
135 FLSVLA J172133.6+590728 G 17 21 33.662 +59 07 28.00       22.26   ~ 5 0
136 FLSVLA J172133.7+595047 G 17 21 33.791 +59 50 47.03       24.31   ~ 6 0
137 [DYH2009] MIPS 22432 G 17 21 36.90 +59 16 07.8       21.80   ~ 8 0
138 [PCE2006] 574 G 17 21 47.659 +58 53 55.82       20.52   ~ 6 0
139 [DYH2009] MIPS 22638 G 17 21 54.7 +58 54 37       23.04   ~ 4 0
140 [DYH2009] MIPS 16202 G 17 22 02.1 +59 32 56       22.64   ~ 2 0
141 [DYH2009] MIPS 16249 G 17 22 08.412 +59 45 54.50       20.47   ~ 5 0
142 [DYH2009] MIPS 16135 G 17 22 10.0 +59 40 06       22.51   ~ 3 0
143 [DYH2009] MIPS 22549 G 17 22 13.9 +59 17 40       23.64   ~ 4 0
144 [DYH2009] MIPS 16118 G 17 22 16.3 +59 47 01           ~ 3 0
145 [DYH2009] MIPS 16170 G 17 22 33.290 +60 15 14.31       20.52   ~ 5 0
146 SSTXFLS24 J172245.0+590328 QSO 17 22 45.182 +59 03 28.01       21.00   ~ 9 0
147 [DYH2009] MIPS 15941 G 17 22 47.8 +60 09 47       23.44   ~ 3 0
148 [MFA2007] 589 G 17 22 56.827 +59 30 58.62       21.47   ~ 6 0
149 FLSVLA J172300.3+591107 G 17 23 00.387 +59 11 07.84           ~ 6 0
150 [PCE2006] 1214 G 17 23 01.437 +59 40 53.87       20.95   ~ 7 0
151 [YSF2007] SST24 J172303.30+591600.2 G 17 23 03.310 +59 16 00.55       23.31   ~ 15 0
152 [DYH2009] MIPS 22621 G 17 23 04.2 +58 57 05           ~ 3 0
153 [YSF2007] SST24 J172324.21+592455.7 G 17 23 24.210 +59 24 55.62       25.10   ~ 8 0
154 [YSF2007] SST24 J172359.74+595752.1 G 17 23 59.770 +59 57 52.42       22.80   ~ 6 0
155 [YSF2007] SST24 J172422.10+593150.8 G 17 24 22.030 +59 31 50.63       23.33   ~ 14 0
156 [YSF2007] SST24 J172428.44+601533.2 G 17 24 28.44 +60 15 33.2       23.70   ~ 15 0
157 NAME South America H2G 22 51 49.307 -17 52 23.96   16.97       ~ 327 3
158 LEDA 90429 SyG 23 39 01.274 +36 21 08.77   16.17       ~ 216 1
159 [VV2000] J235225.0+244009 Sy2 23 52 25.9250656752 +24 40 16.806785592     16.20     ~ 52 0

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