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J/PASJ/59/S529      NEP deep survey at 11um               (Lee+, 2007)

Nature of infrared sources in 11 µm selected sample from early data of the AKARI North Ecliptic Pole deep survey. Lee H.M., Im M., Wada T., Shim H., Kim S.J., Lee M.G., Hwang N., Matsuhara H., Nakagawa T., Oyabu S., Pearson C.P., Takagi T., Onaka T., Fujishiro N., Hanami H., Ishihara D., Ita Y., Kataza H., Kim W., Matusmoto T., Murakami H., Ohyama Y., Sakon I., Tanabe T., Uemizu K., Ueno M., Usui F., Watarai H. <Publ. Astron. Soc. Jap., 59, S529-S542 (2007)> =2007PASJ...59S.529L
ADC_Keywords: Surveys ; Galaxies, photometry ; Photometry, infrared Mission_Name: AKARI Keywords: galaxies: active - galaxies: evolution - galaxies: formation - infrared: galaxies - stars: low-mass, brown dwarfs Abstract: We present the properties of 11um selected sources detected in the early data of the North Ecliptic Pole Deep (NEP-Deep) Survey of AKARI. The data set covers 6 wavelength bands from 2.5 to 11um, with exposure times of 10-20 minutes. This field lies within the CFHT survey with four filter bands (g', r', i', z'), enabling us to establish nearly continuous spectral energy distributions (SEDs) for wavelengths ranging from 0.4 to 11um. The main sample studied here consists of 72 sources whose 11um AB magnitudes are equal to or brighter than 18.5 (144uJy), which is complete to more than 90%. The 11um band has an advantage of sampling star-forming galaxies with low-to-medium redshifts, since the prominent PAH feature shifts into this band. As expected, we find that the majority (71%) of 11um bright sources are star-forming galaxies at 0.2~<z~<0.7 with LIR∼1010-1012∼L based on detailed modelling of the SEDs. We also find four AGNs lying at various redshifts in the main sample. In addition, we discuss a few sources that have non-typical SEDs of the main sample, including a brown-dwarf candidate, a steep power-law source, a flat-spectrum object, and an early-type galaxy at moderate redshift. Description: The NEP-deep-early survey data was taken during the early phase of the scientific observations that started in early 2006 May in order to assess the performance of the IRC instrument. The passbands covered by this mini-survey were N2, N3, N4, S7, S9W, and S11 (see Matsuhara et al., 2006PASJ...58..673M) for the detailed information on the designation of the filters). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 82 72 List of sources brighter than S11=18.5mag
See also: J/ApJS/93/145 : Radio survey around North Ecliptic Pole (Kollgaard+, 1994) J/A+AS/134/221 : Radio-loud ROSAT sources near NEP (Brinkmann+, 1999) J/A+AS/141/257 : ISOCAM obs. of very deep NEP IRAS 60um sources (Aussel+, 2000) J/ApJS/162/304 : ROSAT NEP X-ray source catalog (Henry+, 2006) J/A+A/446/97 : NEP Distant Cluster Radio Galaxies (Branchesi+, 2006) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 19 A19 --- [LIW2007] Object designation ( 21- 30 F10.6 deg RAdeg Right ascension in decimal degrees (J2000) 31- 38 F8.4 deg DEdeg Declination in decimal degrees (J2000) 40- 44 F5.2 mag N2 N2 (2.43um) magnitude in AB system 46- 50 F5.2 mag N3 ?=- N3 (3.16um) magnitude in AB system 52- 56 F5.2 mag N4 ?=- N4 (4.14um) magnitude in AB system 58- 61 F4.1 mag S7 ?=- S7 (7.19um) magnitude in AB system 63- 66 F4.1 mag S9W ?=- S9W (8.74um) magnitude in AB system 68- 71 F4.1 mag S11 S11 (10.4um) magnitude in AB system 73- 82 A10 --- Type Type of object (1)
Note (1): Type as follows: AGN = for power-law sources which are likely to be AGNs (Sect. 4.3.2) Star = for point source with stellar spectra (Sect. 4.3.3) Early-type = for a galaxy with E/S0-like spectra (Sect. 5) SF galaxy = Star-forming galaxy (Sect. 4.3.1)
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 02-Oct-2008
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