2009ApJ...700.1190D

Query : 2009ApJ...700.1190D

2009ApJ...700.1190D - Astrophys. J., 700, 1190-1204 (2009/August-1)

Strong polycyclic aromatic hydrocarbon emission from z ~ 2 ULIRGs.

DESAI V., SOIFER B.T., DEY A., LE FLOC'H E., ARMUS L., BRAND K., BROWN M.J.I., BRODWIN M., JANNUZI B.T., HOUCK J.R., WEEDMAN D.W., ASHBY M.L.N., GONZALEZ A., HUANG J., SMITH H.A., TEPLITZ H., WILLNER S.P. and MELBOURNE J.

Abstract (from CDS):

Using the Infrared Spectrograph on board the Spitzer Space Telescope, we present low-resolution (64 < λ/δλ < 124), mid-infrared (20-38 µm) spectra of 23 high-redshift ULIRGs detected in the Boötes field of the NOAO Deep Wide-Field Survey. All of the sources were selected to have (1) fν(24 µm)>0.5 mJy; (2) R - [24]>14 Vega mag; and (3) a prominent rest frame 1.6 µm stellar photospheric feature redshifted into Spitzer's 3-8 µm IRAC bands. Of these, 20 show emission from polycyclic aromatic hydrocarbons (PAHs), usually interpreted as signatures of star formation. The PAH features indicate redshifts in the range 1.5 < z < 3.0, with a mean of = 1.96 and a dispersion of 0.30. Based on local templates, these sources have extremely large infrared luminosities, comparable to that of submillimeter galaxies. Our results confirm previous indications that the rest-frame 1.6 µm stellar bump can be efficiently used to select highly obscured star-forming galaxies at z ~ 2, and that the fraction of starburst-dominated ULIRGs increases to faint 24 µm flux densities. Using local templates, we find that the observed narrow redshift distribution is due to the fact that the 24 µm detectability of PAH-rich sources peaks sharply at z = 1.9. We can analogously use observed spectral energy distributions to explain the broader redshift distribution of Spitzer-detected ULIRGs that are dominated by an active galactic nucleus (AGN). Finally, we conclude that z ~ 2 sources with a detectable 1.6 µm stellar opacity feature lack sufficient AGN emission to veil the 7.7 µm PAH band.

Abstract Copyright: ∼

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

Nomenclature: Tables 1-3: [DSD2009] SST4 JHHMMSS.s+DDMMSS.s N=23.

Simbad objects: 31

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Number of rows : 31
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 2MASS J08105865+7602424 Sy1 08 10 58.6641543864 +76 02 42.450451260   15.03 14.71     ~ 508 0
2 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
3 Z 294-4 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 2096 3
4 [DSD2009] SST24 J142600.6+343452.8 G 14 26 00.60 +34 34 52.8       24.6 23.1 ~ 1 0
5 SDWFS J142637.39+333025.6 G 14 26 37.397 +33 30 25.65       26.7 24.97 ~ 5 0
6 SDWFS J142652.53+345505.5 G 14 26 52.515 +34 55 06.05   26.35   25.3 24.97 ~ 5 0
7 SDWFS J142724.99+350823.9 G 14 27 24.917 +35 08 24.34       26.3 23.5 ~ 5 0
8 [DSD2009] SST24 J142832.4+340849.8 G 14 28 32.443 +34 08 49.83   25.81   24.53 23.6 ~ 5 0
9 SDWFS J142920.20+333023.0 G 14 29 20.149 +33 30 23.91       24.58 24.0 ~ 5 0
10 [DSD2009] SST24 J142941.1+340915.7 G 14 29 41.085 +34 09 15.73       24.88 24.2 ~ 5 0
11 [DSD2009] SST24 J142951.2+342042.1 G 14 29 51.196 +34 20 42.06   24.99   24.78 23.5 ~ 5 0
12 [DSD2009] SST24 J143020.5+330344.2 G 14 30 20.493 +33 03 44.20       26.8 24.37 ~ 5 0
13 SDWFS J143137.01+334501.2 G 14 31 37.108 +33 45 01.65   24.45   25.0 23.2 ~ 5 0
14 [DSD2009] SST24 J143143.4+324943.8 G 14 31 43.40 +32 49 43.8       26.0 24.3 ~ 2 0
15 [DSD2009] SST24 J143152.4+350030.1 G 14 31 52.386 +35 00 30.05   26.90   25.2 23.8 ~ 5 0
16 NAME NOAO Deep Wide Field reg 14 32 05.75 +34 16 47.5           ~ 430 0
17 [DSD2009] SST24 J143216.8+335231.7 G 14 32 16.846 +33 52 31.72   25.87   24.68 24.2 ~ 5 0
18 [DSD2009] SST24 J143321.8+342502.0 G 14 33 21.823 +34 25 02.04   25.78   24.34 23.5 ~ 5 0
19 [DSD2009] SST24 J143324.3+334239.5 G 14 33 24.302 +33 42 39.53   25.76   24.64 23.3 ~ 5 0
20 [DSD2009] SST24 J143331.9+352027.2 G 14 33 31.923 +35 20 27.19   25.98   24.7 23.8 ~ 5 0
21 [DSD2009] SST24 J143349.6+334601.7 G 14 33 49.578 +33 46 01.74   26.07   24.7 24.38 ~ 5 0
22 [DSD2009] SST24 J143458.9+333437.0 G 14 34 58.945 +33 34 37.05   25.36   24.6 23.6 ~ 5 0
23 [DSD2009] SST24 J143502.9+342658.8 G 14 35 02.933 +34 26 58.78   25.49   24.5 24.29 ~ 5 0
24 [DSD2009] SST24 J143503.2+340243.6 G 14 35 03.241 +34 02 43.59       25.0 24.3 ~ 5 0
25 [DSD2009] SST24 J143702.0+344630.4 G 14 37 01.989 +34 46 30.42       27.7   ~ 5 0
26 [DSD2009] SST24 J143743.3+341049.4 G 14 37 43.260 +34 10 49.36       26.4 24.3 ~ 2 0
27 [DSD2009] SST24 J143816.6+333700.6 G 14 38 16.600 +33 37 00.63   25.94   24.6 23.7 ~ 5 0
28 IC 1127 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 3090 4
29 NGC 7023 OpC 21 01 36.9 +68 09 48           ~ 739 0
30 NGC 7714 AGN 23 36 14.1257730600 +02 09 18.197422668   14.91 14.36     ~ 788 1
31 APG 284 PaG 23 36 19 +02 09.3   12.6       ~ 608 0

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