INFRARED SPECTROGRAPH SPECTROSCOPY AND MULTI-WAVELENGTH STUDY OF LUMINOUS STAR-FORMING GALAXIES AT<i>z</i>≃ 1.9

Huang, Jia-Sheng; Faber, S. M.; Daddi, E.; Laird, E. S.; Lai, Kamson; Omont, A.; Wu, Yue; Younger, Joshua D.; Bundy, Kevin; Cattaneo, Andrea; Chapman, Scott; Conselice, Christopher J.; Dickinson, Mark; Egami, Eiichi; Fazio, G. G.; Im, Myungshin; Koo, David C.; Floc’h, E. Le; Papovich, C.; Rigopoulou, D.; Smail, Ian; Song, Mimi; Werf, P.P. Van de; Webb, Tracy; Willmer, C. N. A.; Willner, S. P.; Yan, Lin

doi:10.1088/0004-637x/700/1/183

Cited by 58 publications

(101 citation statements)

References 125 publications

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“…cuts 0.05 < [3.6] − [4.5] < 0.4 and −0.7 < [3.6] − [8.0] < 0.5, where [3.6] denotes the AB magnitude in the 3.6 μm band (and likewise for the 4.5 and 8.0 μm bands). Extensive follow-up has confirmed the reliability of this criterion for selecting galaxies at 1.5 < z < 3 (Huang et al 2009;Desai et al 2009). These sources are referred to as the IRAC peakers hereafter.…”

Section: Distant "Stellar-bump Dominated" Galaxiesmentioning

confidence: 77%

Dust-obscured star formation and the contribution of galaxies escaping UV/optical color selections atz ~ 2

Riguccini¹,

Floc’h²,

Ilbert³

et al. 2011

A&A

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Context. A substantial amount of the stellar mass growth across cosmic time occurred within dust-enshrouded environments. So far, identification of complete samples of distant star-forming galaxies from the short wavelength range has been strongly biased by the effect of dust extinction. Nevertheless, the exact amount of star-forming activity that took place in high-redshift dusty galaxies but that has currently been missed by optical surveys has barely been explored. Aims. Our goal is to determine the number of luminous star-forming galaxies at 1.5 < ∼ z < ∼ 3 that are potentially missed by the traditional color selection techniques because of dust extinction. We also aim at quantifying the contribution of these sources to the IR luminosity and cosmic star formation density at high redshift. Methods. We based our work on a sample of 24 μm sources brighter than 80 μJy and taken from the Spitzer survey of the COSMOS field. Almost all of these sources have accurate photometric redshifts. We applied to this mid-IR selected sample the BzK and BM/BX criteria, as well as the selections of the IRAC peakers and the Optically-Faint IR-bright (OFIR) galaxies. We analyzed the fraction of sources identified with these techniques. We also computed 8 μm rest-frame luminosity from the 24 μm fluxes of our sources, and considering the relationships between L 8 μm and L Paα and between L 8 μm and L IR , we derived ρ IR and then ρ SFR for our MIPS sources. Results. The BzK criterion offers an almost complete (∼90%) identification of the 24 μm sources at 1.4 < z < 2.5. In contrast, the BM/BX criterion misses 50% of the MIPS sources. We attribute this bias to the effect of extinction, which reddens the typical colors of galaxies. The contribution of these two selections to the IR luminosity density produced by all the sources brighter than 80 μJy are on the same order. Moreover the criterion based on the presence of a stellar bump in their spectra (IRAC peakers) misses up to 40% of the IR luminosity density, while only 25% of the IR luminosity density at z ∼ 2 is produced by OFIR galaxies characterized by extreme mid-IR to optical flux ratios. Conclusions. Color selections of distant star-forming galaxies must be used with care given the substantial bias they can suffer. In particular, the effect of dust extinction strongly affects the completeness of identifications at the bright end of the bolometric luminosity function, which implies large and uncertain extrapolations to account for the contribution of dusty galaxies missed by these selections. In the context of forthcoming facilities that will operate at long wavelengths (e.g., JWST, ALMA, SAFARI, EVLA, SKA), this emphasizes the importance of minimizing the extinction biases when probing the activity of star formation in the early Universe.

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Section: Distant "Stellar-bump Dominated" Galaxiesmentioning

confidence: 77%

Dust-obscured star formation and the contribution of galaxies escaping UV/optical color selections atz ~ 2

Riguccini¹,

Floc’h²,

Ilbert³

et al. 2011

A&A

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“…Younger et al (2009) have studied the FIR properties of a similar Spitzer-selected sample, based on MIPS 70 and 160 μm detections and MAMBO 1.2 mm observations. This sample (see also Huang et al 2009) is selected based on IRAC colors, and 24 μm flux densities (see Fig. 7, Table 2 and Sect.…”

Section: Discussionmentioning

confidence: 99%

“…The sample of Lo09 is based on the same criteria, but is biased toward sources brighter at 24 μm, with 819 μJy on average vs. 566 μJy for the present sample. The sample of Farrah et al (2008) is similar but aimed at "4.5 μm-peakers"; the sample of Huang et al (2009) and Younger et al (2009) is based on different IRAC criteria, but they indeed select almost exclusively "5.8 μm-peakers" (Sect. 5.1).…”

Section: Sample Selection and Ancillary Datamentioning

confidence: 99%

Multi-wavelength properties ofSpitzerselected starbursts atz ~ 2

Fiolet

Omont

Polletta

et al. 2009

A&A

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Context. Wide-field Spitzer surveys allow identification of thousands of potentially high-z submillimeter galaxies (SMGs) through their bright 24 μm emission and their mid-IR colors. Aims. We want to determine the average properties of such z ∼ 2 Spitzer-selected SMGs by combining millimeter, radio, and infrared photometry for a representative IR-flux (λ rest ∼ 8 μm) limited sample of SMG candidates. Methods. A complete sample of 33 sources believed to be starbursts ("5.8 μm-peakers") was selected in the (0.5 deg 2 ) J1046+56 field with selection criteria F 24 μm > 400 μJy, the presence of a redshifted stellar emission peak at 5.8 μm, and r Vega > 23. The field, part of the SWIRE Lockman Hole field, benefits from very deep VLA/GMRT 20 cm, 50 cm, and 90 cm radio data (all 33 sources are detected at 50 cm), and deep 160 μm and 70 μm Spitzer data. The 33 sources, with photometric redshifts ∼1.5−2.5, were observed at 1.2 mm with IRAM-30m/MAMBO to an rms ∼0.7-0.8 mJy in most cases. Their millimeter, radio, 7-band Spitzer, and near-IR properties were jointly analyzed.Results. The entire sample of 33 sources has an average 1.2 mm flux density of 1.56 ± 0.22 mJy and a median of 1.61 mJy, so the majority of the sources can be considered SMGs. Four sources have confirmed 4σ detections, and nine were tentatively detected at the 3σ level. Because of its 24 μm selection, our sample shows systematically lower F 1.2 mm /F 24 μm flux ratios than classical SMGs, probably because of enhanced PAH emission. A median FIR SED was built by stacking images at the positions of 21 sources in the region of deepest Spitzer coverage. Its parameters are T dust = 37 ± 8 K, L FIR = 2.5 × 10 12 L , and SFR = 450 M yr −1 . The FIR-radio correlation provides another estimate of L FIR for each source, with an average value of 4.1 × 10 12 L ; however, this value may be overestimated because of some AGN contribution. Most of our targets are also luminous star-forming BzK galaxies which constitute a significant fraction of weak SMGs at 1.7 z 2.3. Conclusions. Spitzer 24 μm-selected starbursts and AGN-dominated ULIRGs can be reliably distinguished using IRAC-24 μm SEDs. Such "5.8 μm-peakers" with F 24 μm > 400 μJy have L FIR 10 12 L . They are thus z ∼ 2 ULIRGs, and the majority may be considered SMGs. However, they have systematically lower 1.2 mm/24 μm flux density ratios than classical SMGs, warmer dust, comparable or lower IR/mm luminosities, and higher stellar masses. About 2000−3000 "5.8 μm-peakers" may be easily identifiable within SWIRE catalogues over 49 deg 2 .

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“…Rigby et al (2008) investigate the rest-frame 8 μm luminosity of galaxies at z ∼ 2 as a function of total IR luminosity and find a similar trend. Using Spitzer/IRS, Huang et al (2009) also report ULIRGs with high PAH-to-total IR luminosity ratio at z ∼ 2. Our results show that there are extreme starbursts with ULIRG luminosity even at z ∼ 1.…”

Section: Pah-to-total Ir Luminosity Relationmentioning

confidence: 93%

Polycyclic aromatic hydrocarbon (PAH) luminous galaxies atz ~ 1

Takagi¹,

Ohyama

Goto

et al. 2010

A&A

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Aims. The NEP-deep survey, an extragalactic AKARI survey towards the north ecliptic pole (NEP), provides a comprehensive wavelength coverage from 2 to 24 μm using all 9 photometric bands of the infrared camera (IRC). It allows us to photometrically identify galaxies whose mid-IR emission is clearly dominated by PAHs. Methods. We propose a single-colour selection method to identify such galaxies, using two mid-IR flux ratios at 11-to-7 μm and 15-to-9 μm (PAH-to-continuum flux ratio in the rest frame), which are useful for identifying starburst galaxies at z ∼ 0.5 and 1, respectively. We perform a fitting of the spectral energy distributions (SEDs) from optical to mid-IR wavelengths, using an evolutionary starburst model with a proper treatment of radiative transfer (SBURT), in order to investigate their nature.Results. The SBURT model reproduces observed optical-to-mid-IR SEDs of more than a half of the PAH-selected galaxies. Based on the 8 μm luminosity, we find ultra luminous infrared galaxies (ULIRGs) among PAH-selected galaxies. Their PAH luminosity is higher than local ULIRGs with a similar luminosity, and the PAH-to-total IR luminosity ratio is consistent with that of less luminous starburst galaxies. They are a unique galaxy population at high redshifts, and we call these PAH-selected ULIRGs "PAH-luminous" galaxies. Although they are not as massive as submillimetre galaxies at z ∼ 2, they have the stellar mass of >3 × 10 10 M and therefore are moderately massive.

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INFRARED SPECTROGRAPH SPECTROSCOPY AND MULTI-WAVELENGTH STUDY OF LUMINOUS STAR-FORMING GALAXIES ATz≃ 1.9

Cited by 58 publications

References 125 publications

Dust-obscured star formation and the contribution of galaxies escaping UV/optical color selections atz ~ 2

Dust-obscured star formation and the contribution of galaxies escaping UV/optical color selections atz ~ 2

Multi-wavelength properties ofSpitzerselected starbursts atz ~ 2

Polycyclic aromatic hydrocarbon (PAH) luminous galaxies atz ~ 1

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