Nature of infrared sources in 11 μm selected sample from early data of the AKARI north ecliptic pole deep survey

Hyung Mok Lee; Myungshin Im; Takehiko Wada; Hyunjin Shim; Seong Jin Kim; Myung Gyoon Lee; Narae Hwang; Hideo Matsuhara; Takao Nakagawa; Shinki Oyabu; Chris P. Pearson; Toshinobu Takagi; Takashi Onaka; Naofumi Fujishiro; Hitoshi Hanami; Daisuke Ishihara; Yoshifusa Ita; Hirokazu Kataza; Woojung Kim; Toshio Matusmoto; Hiroshi Murakami; Youichi Ohyama; Itsuki Sakon; Toshihiko Tanabé; Kazunori Uemizu; Munetaka Ueno; Fumihiko Usui; Hidenori Watarai

doi:10.1093/pasj/59.sp2.s529

Nature of infrared sources in 11 μm selected sample from early data of the AKARI north ecliptic pole deep survey

Hyung Mok Lee, Myungshin Im, Takehiko Wada, Hyunjin Shim, Seong Jin Kim, Myung Gyoon Lee, Narae Hwang, Hideo Matsuhara, Takao Nakagawa, Shinki Oyabu, Chris P. Pearson, Toshinobu Takagi, Takashi Onaka, Naofumi Fujishiro, Hitoshi Hanami, Daisuke Ishihara, Yoshifusa Ita, Hirokazu Kataza, Woojung Kim, Toshio MatusmotoHiroshi Murakami, Youichi Ohyama, Itsuki Sakon, Toshihiko Tanabé, Kazunori Uemizu, Munetaka Ueno, Fumihiko Usui, Hidenori Watarai

Department of Earth Science Education

Research output: Contribution to journal › Review article › peer-review

20 Scopus citations

Abstract

We present the properties of 11 μm 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 11 μm, 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 11 μm. The main sample studied here consists of 72 sources whose 11 μm AB magnitudes are equal to or brighter than 18.5 (144 μJy), which is complete to more than 90%. The 11 μm 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 11 μm bright sources are star-forming galaxies at 0.2 ≲ z ≲ 0.7 with L_IR ∼ 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.

Original language	English
Pages (from-to)	S529-S542
Journal	Publication of the Astronomical Society of Japan
Volume	59
Issue number	SPEC. ISS. 2
DOIs	https://doi.org/10.1093/pasj/59.sp2.s529
State	Published - 2007

Keywords

Galaxies: active
Galaxies: evolution
Galaxies: formation
Infrared: galaxies
Stars: low-mass, brown dwarfs

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10.1093/pasj/59.sp2.s529

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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., ... Watarai, H. (2007). Nature of infrared sources in 11 μm selected sample from early data of the AKARI north ecliptic pole deep survey. Publication of the Astronomical Society of Japan, 59(SPEC. ISS. 2), S529-S542. https://doi.org/10.1093/pasj/59.sp2.s529

@article{05dbfc0979bc4062bdc229190d2712ce,

title = "Nature of infrared sources in 11 μm selected sample from early data of the AKARI north ecliptic pole deep survey",

abstract = "We present the properties of 11 μm 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 11 μm, 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 11 μm. The main sample studied here consists of 72 sources whose 11 μm AB magnitudes are equal to or brighter than 18.5 (144 μJy), which is complete to more than 90%. The 11 μm 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 11 μm 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.",

keywords = "Galaxies: active, Galaxies: evolution, Galaxies: formation, Infrared: galaxies, Stars: low-mass, brown dwarfs",

author = "Lee, {Hyung Mok} and Myungshin Im and Takehiko Wada and Hyunjin Shim and Kim, {Seong Jin} and Lee, {Myung Gyoon} and Narae Hwang and Hideo Matsuhara and Takao Nakagawa and Shinki Oyabu and Pearson, {Chris P.} and Toshinobu Takagi and Takashi Onaka and Naofumi Fujishiro and Hitoshi Hanami and Daisuke Ishihara and Yoshifusa Ita and Hirokazu Kataza and Woojung Kim and Toshio Matusmoto and Hiroshi Murakami and Youichi Ohyama and Itsuki Sakon and Toshihiko Tanab{\'e} and Kazunori Uemizu and Munetaka Ueno and Fumihiko Usui and Hidenori Watarai",

year = "2007",

doi = "10.1093/pasj/59.sp2.s529",

language = "English",

volume = "59",

pages = "S529--S542",

journal = "Publication of the Astronomical Society of Japan",

issn = "0004-6264",

publisher = "Oxford University Press",

number = "SPEC. ISS. 2",

}

Lee, HM, Im, M, Wada, T, Shim, H, Kim, SJ, Lee, MG, Hwang, N, Matsuhara, H, Nakagawa, T, Oyabu, S, Pearson, CP, Takagi, T, Onaka, T, Fujishiro, N, Hanami, H, Ishihara, D, Ita, Y, Kataza, H, Kim, W, Matusmoto, T, Murakami, H, Ohyama, Y, Sakon, I, Tanabé, T, Uemizu, K, Ueno, M, Usui, F & Watarai, H 2007, 'Nature of infrared sources in 11 μm selected sample from early data of the AKARI north ecliptic pole deep survey', Publication of the Astronomical Society of Japan, vol. 59, no. SPEC. ISS. 2, pp. S529-S542. https://doi.org/10.1093/pasj/59.sp2.s529

TY - JOUR

T1 - Nature of infrared sources in 11 μm selected sample from early data of the AKARI north ecliptic pole deep survey

AU - Lee, Hyung Mok

AU - Im, Myungshin

AU - Wada, Takehiko

AU - Shim, Hyunjin

AU - Kim, Seong Jin

AU - Lee, Myung Gyoon

AU - Hwang, Narae

AU - Matsuhara, Hideo

AU - Nakagawa, Takao

AU - Oyabu, Shinki

AU - Pearson, Chris P.

AU - Takagi, Toshinobu

AU - Onaka, Takashi

AU - Fujishiro, Naofumi

AU - Hanami, Hitoshi

AU - Ishihara, Daisuke

AU - Ita, Yoshifusa

AU - Kataza, Hirokazu

AU - Kim, Woojung

AU - Matusmoto, Toshio

AU - Murakami, Hiroshi

AU - Ohyama, Youichi

AU - Sakon, Itsuki

AU - Tanabé, Toshihiko

AU - Uemizu, Kazunori

AU - Ueno, Munetaka

AU - Usui, Fumihiko

AU - Watarai, Hidenori

PY - 2007

Y1 - 2007

N2 - We present the properties of 11 μm 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 11 μm, 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 11 μm. The main sample studied here consists of 72 sources whose 11 μm AB magnitudes are equal to or brighter than 18.5 (144 μJy), which is complete to more than 90%. The 11 μm 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 11 μm 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.

AB - We present the properties of 11 μm 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 11 μm, 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 11 μm. The main sample studied here consists of 72 sources whose 11 μm AB magnitudes are equal to or brighter than 18.5 (144 μJy), which is complete to more than 90%. The 11 μm 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 11 μm 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.

KW - Galaxies: active

KW - Galaxies: evolution

KW - Galaxies: formation

KW - Infrared: galaxies

KW - Stars: low-mass, brown dwarfs

UR - http://www.scopus.com/inward/record.url?scp=36849022186&partnerID=8YFLogxK

U2 - 10.1093/pasj/59.sp2.s529

DO - 10.1093/pasj/59.sp2.s529

M3 - Review article

AN - SCOPUS:36849022186

SN - 0004-6264

VL - 59

SP - S529-S542

JO - Publication of the Astronomical Society of Japan

JF - Publication of the Astronomical Society of Japan

IS - SPEC. ISS. 2

ER -

Nature of infrared sources in 11 μm selected sample from early data of the AKARI north ecliptic pole deep survey

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Keywords

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