2005AJ....130.2019O

Query : 2005AJ....130.2019O

2005AJ....130.2019O - Astron. J., 130, 2019-2042 (2005/November-0)

Optical identification of infrared space observatory far-infrared sources in the Lockman hole using a deep very large array 1.4 GHz continuum survey.

OYABU S., YUN M.S., MURAYAMA T., SANDERS D.B., KAWARA K., TANIGUCHI Y., VEILLEUX S., OKUDA H., MATSUHARA H., COWIE L.L., SATO Y., WAKAMATSU K. and SOFUE Y.

Abstract (from CDS):

By exploiting the far-infrared (FIR) and radio correlation, we have performed a likelihood-ratio analysis to identify optical counterparts to the FIR sources that have been found in an area of ∼0.9 deg2 during the Infrared Space Observatory (ISO) deep FIR survey in the Lockman Hole. New ground-based observations have been conducted to build up the catalogs of radio and optical objects, which include a deep Very Large Array (VLA) observation at 1.4 GHz, optical R- and I-band imaging with the Subaru 8 m and University of Hawaii 2.2 m telescopes, and optical spectroscopy with the Keck II 10 m and WIYN 3.5 m telescopes. This work is based on FIR samples consisting of 116 and 20 sources selected with the criteria of FC(90 µm)≥43 mJy and FC(170 µm)≥102 mJy, respectively, where FC is the bias-corrected flux. Using the likelihood ratio analysis and the associated reliability, 44 FIR sources have been identified with radio sources. Optical confirmation of the 44 FIR/radio associations was then conducted using accurate radio positions. Redshifts have been obtained for 29 out of the 44 identified sources. One hyperluminous infrared galaxy (HyLIRG) with LFIR>1013 L☉ and four ultraluminous infrared galaxies (ULIRGs) with LFIR=1012-1013 L☉ are identified in our sample, while the remaining 24 FIR galaxies have LFIR<1012 L☉. The space density of the FIR sources at z=0.3-0.6 is 4.6x10–5/Mpc3, which is 460 times larger than the local value, implying a rapid evolution of the ULIRG population. Most ISO FIR sources have L(1.4 GHz)/L(90 µm) similar to the star-forming galaxies Arp 220 and M82, indicating that star formation is the dominant mechanism for their FIR and radio luminosity.

At least seven of our FIR sources show evidence for the presence of an active galactic nucleus (AGN) in optical emission lines, radio continuum excess, or X-ray activity. Three out of five (60%) of the ULIRGs/HyLIRGs are AGN galaxies, suggesting that the AGN fraction among the ULIRG/HyLIRG population may not change significantly between z∼0.5 and the present epoch. Five of the seven AGN galaxies are within the ROSAT X-ray survey field, and two are within the XMM-Newton survey fields. X-ray emission has been detected in only one source, 1EX030, which is optically classified as a quasar. The nondetection in the XMM-Newton 2-10 keV band suggests a very thick absorption column density of 3x1024/cm2 or AV∼1200 mag obscuring the central source of the two AGN galaxies. Several sources have an extreme FIR luminosity relative to the optical R band, L(90 µm)/L(R)>500, which is rare even among the local ULIRG population. While source confusion or blending might offer an explanation in some cases, these observations may represent a new population of galaxies with an extreme amount of star formation in an undeveloped stellar system, i.e., formation of bulges or young elliptical galaxies.


Abstract Copyright: ∼

Journal keyword(s): Galaxies: Evolution - Galaxies: Starburst - Infrared: Galaxies

Nomenclature: Table 2, col(3): [OYM2005] REX NN (Nos 1-31), [OYM2005] RNW NN (Nos 1-15).

Simbad objects: 80

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Number of rows : 80
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 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5860 6
2 SA 101- reg 09 57 28.2 -00 19 39           ~ 74 0
3 [VV96] J102434.5+470911 Sy1 10 24 34.5 +47 09 11     20.5     ~ 485 0
4 [KMO2004] 2NW013 IR 10 31 24.8 +57 42 39           ~ 2 0
5 [KMO2004] 1NW034 IR 10 31 47.0 +57 49 50           ~ 2 0
6 [KMO2004] 1NW077 IR 10 32 05.9 +58 02 47           ~ 2 0
7 2MASS J10324949+5737081 G 10 32 49.520 +57 37 08.38           ~ 4 0
8 [KMO2004] 1NW031 IR 10 33 14.7 +57 31 35           ~ 3 0
9 [KMO2004] 2NW005 G 10 33 20.217 +57 49 13.50           ~ 4 0
10 [RLF2003] LHJ103327+574539 IR 10 33 27.6 +57 45 39           ~ 2 0
11 3C 244.1 QSO 10 33 33.9860997312 +58 14 35.611906344   19.0 19.0     ~ 186 1
12 SWIRE J103341.28+580221.4 G 10 33 41.256 +58 02 19.87           ~ 3 0
13 [KMO2004] 1NW100 IR 10 33 53.3 +57 27 19           ~ 2 0
14 2MASX J10335869+5743169 EmG 10 33 58.7113585512 +57 43 17.240174076   19.40 17.87 17.26   ~ 10 0
15 SWIRE J103358.9+572952 AGN 10 33 59.140 +57 29 52.86           ~ 3 0
16 [KMO2004] 1NW221 IR 10 34 09.6 +57 27 04           ~ 3 0
17 [KMO2004] 1NW026 IR 10 35 13.9 +57 34 53           ~ 2 0
18 [KMO2004] 1NW025 IR 10 35 17.0 +57 33 22           ~ 3 0
19 [RLF2003] LHJ103521+580034 IR 10 35 21.2 +58 00 34           ~ 2 0
20 [KMO2004] 1NW043 IR 10 35 32.6 +57 31 37           ~ 3 0
21 [RLF2003] LHJ103249+573719 IR 10 36 01.7 +57 21 46           ~ 2 0
22 [KMO2004] 1NW092 G 10 36 03.9730546656 +57 48 12.748255488           ~ 3 0
23 [RLF2003] LHJ103604+574815 IR 10 36 04.4 +57 48 15           ~ 2 0
24 2MASS J10360650+5747024 G 10 36 06.467 +57 47 02.52           ~ 14 0
25 [RLF2003] LHJ103610+574330 IR 10 36 10.6 +57 43 30           ~ 2 0
26 [KMO2004] 2NW022 IR 10 36 13.2 +57 43 12           ~ 2 0
27 [OYM2005] RNW 15 AGN 10 36 14.0 +57 39 08           ~ 2 0
28 NAME Lockman Hole reg 10 45 00.0 +58 00 00           ~ 840 0
29 [KMO2004] 1EX153 IR 10 50 03.7 +57 16 24           ~ 2 0
30 [KMO2004] 2EX061 IR 10 50 16.6 +57 12 29           ~ 2 0
31 [KMO2004] 1EX117 IR 10 50 18.0 +57 28 06           ~ 2 0
32 [KMO2004] 2EX025 IR 10 50 37.6 +57 28 52           ~ 2 0
33 [RLF2003] LHJ105041+570708 IR 10 50 41.2 +57 07 08           ~ 3 0
34 LEDA 2557557 G 10 50 41.920 +57 07 06.41           ~ 8 0
35 2MASX J10505236+5735064 AGN 10 50 52.3906267704 +57 35 07.117844784           ~ 15 0
36 SDSS J105056.59+571631.5 IG 10 50 56.595 +57 16 31.50           ~ 5 0
37 [KMO2004] 1EX084 IR 10 50 59.8 +57 20 21           ~ 2 0
38 SDSS J105113.29+571426.7 AGN 10 51 13.295 +57 14 26.71           ~ 11 0
39 [RLF2003] LHJ105113+571415 IR 10 51 13.4 +57 14 15           ~ 3 0
40 [KMO2004] 1EX038 IR 10 51 17.5 +57 28 01           ~ 2 0
41 NVSS J105120+573538 Rad 10 51 20.843 +57 35 32.64       24.86   ~ 5 0
42 LEDA 2568498 LIN 10 51 25.6803203232 +57 35 44.114215704           ~ 11 0
43 [KMO2004] 1EX076 IR 10 51 26.2 +57 35 12           ~ 4 1
44 [KMO2004] 1EX075 IR 10 51 31.9 +57 34 02           ~ 2 0
45 [KMO2004] 1EX100 AGN 10 51 32.8 +57 29 39           ~ 4 0
46 SWIRE J105151.64+570935.7 G 10 51 51.602 +57 09 35.85           ~ 3 0
47 [RLF2003] LHJ105206+570751 IR 10 52 06.2 +57 07 51           ~ 3 0
48 SDSS J105207.14+570745.7 G 10 52 07.146 +57 07 45.73           ~ 9 0
49 [RLF2003] LHJ105223+570159 IR 10 52 23.5 +57 01 59           ~ 3 0
50 [RLF2003] LHJ105226+570222 IR 10 52 26.4 +57 02 22           ~ 3 0
51 [KMO2004] 2EX059 IR 10 52 29.2 +57 09 13           ~ 2 0
52 [KMO2004] 2EX015 AGN 10 52 33.9 +57 31 18           ~ 2 0
53 [VV98] J105239.6+572432 QSO 10 52 39.5958253296 +57 24 31.425574788   18.39 18.07     ~ 76 0
54 [OYM2005] REX 22 Rad 10 52 52.76 +57 07 53.7           ~ 1 0
55 SDSS J105252.77+570753.8 G 10 52 52.7882900712 +57 07 53.901172128           ~ 15 0
56 [RLF2003] LHJ105254+570816 IR 10 52 54.4 +57 08 16           ~ 3 0
57 LEDA 2558142 G 10 52 56.895 +57 08 25.73           ~ 6 0
58 [OYM2005] REX 23 Rad 10 52 58.00 +57 08 34.8       22.89   ~ 3 0
59 [RLF2003] LHJ105300+570548 IR 10 53 00.3 +57 05 48           ~ 3 0
60 2MASS J10530133+5705433 G 10 53 01.3561774608 +57 05 43.088623584           ~ 15 0
61 2MASS J10531899+5721394 G 10 53 18.953 +57 21 40.46           ~ 12 0
62 2MASX J10532085+5714338 AGN 10 53 20.901 +57 14 33.35           ~ 8 0
63 [KMO2004] 2EX008 IR 10 53 24.9 +57 14 03           ~ 2 0
64 [KMO2004] 1EX026 HII 10 53 26.1 +57 29 06           ~ 4 0
65 [KMO2004] 1EX025 AGN 10 53 27.3 +57 11 24           ~ 2 0
66 [RLF2003] LHJ105328+571404 IR 10 53 28.0 +57 14 04           ~ 1 0
67 [KMO2004] 1EX112 IR 10 53 40.5 +57 30 38           ~ 2 0
68 [KMO2004] 2EX021 IR 10 53 47.0 +57 07 01           ~ 2 0
69 NGC 3440 AGN 10 53 49.508 +57 07 07.52   14.02       ~ 82 1
70 [KMO2004] 1EX055 IR 10 53 56.4 +57 23 32           ~ 2 0
71 [RLF2003] LHJ105349+570716 IR 10 59 49.1 +57 07 16           ~ 3 0
72 SA 103- reg 11 55 07 +00 33.4           ~ 5 0
73 SA 104- reg 12 42 21.0 -00 32 29           ~ 58 0
74 Mrk 231 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 1989 3
75 SA 57- reg 13 08 38 +29 23.1           ~ 179 0
76 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4330 4
77 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2961 4
78 ELAISR J160825+543809 PaG 16 08 25.242 +54 38 10.07           ~ 17 1
79 ELAISR J160927+542832 G 16 09 28.1 +54 28 33           ~ 19 0
80 NGC 6240 Sy2 16 52 58.9 +02 24 03   14.31 13.37     ~ 1637 2

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