THE MID-INFRARED VIEW OF RED SEQUENCE GALAXIES IN ABELL 2218 WITH
                    <i>AKARI</i>

Ko, Jongwan; Im, Myungshin; Lee, Hyung Mok; Lee, Myung Gyoon; Hopwood, R.; Serjeant, S.; Smail, Ian; Hwang, Ho Seong; Hwang, Narae; Shim, Hyunjin; Kim, Seong‐Jin; Lee, Jong Chul; Lim, Sungsoon; Seo, Hyunjong; Goto, Tomotsugu; Hanami, H.; Matsuhara, Hideo; Takagi, Toshinobu; Wada, Takehiko

doi:10.1088/0004-637x/695/2/l198

Cited by 17 publications

(40 citation statements)

References 34 publications

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“…The enhancement of mid-IR excess galaxies in high-density regions is mainly because of faint galaxies (open circles); roughly half of faint, quiescent red-sequence galaxies are mid-IR excess galaxies (i.e., recent star formation at 2 Gyr). The luminosity dependence of the fraction of mid-IR excess galaxies is consistent with the results in Ko et al (2009Ko et al ( , 2012; faint (low-mass) galaxies are more likely to have mid-IR excess emission among red early-type galaxies. However, the environmental dependence of the fraction of mid-IR excess galaxies (i.e., a higher fraction of mid-IR excess galaxies in high-density regions than in low-density regions) seems different from our previous results (i.e., a low fraction of red early-type galaxies with mid-IR excess emission in high-density regions).…”

Section: Environmental Dependence Of Near-uv and Mid-ir Excess Galaxiessupporting

confidence: 84%

“…Recent studies, however, reveal that the optical red sequence contains not only early-type galaxies with signs of recent star formation (e.g., Yi et al 2005;Bressan et al 2006;Schawinski et al 2007;Clemens et al 2009;Ko et al 2009;Lee et al 2010;Vega et al 2010;Ko et al 2012), but also late-type galaxies with optical colors reddened by dust extinction or with a low level of star formation (e.g., Bamford et al 2009;Gallazzi et al 2009;Wolf et al 2009;Masters et al 2010;Ko et al 2012). Various types of galaxies on the red sequence are easily found when one examines these red-sequence galaxies at different wavelengths.…”

Section: Introductionmentioning

confidence: 99%

“…The near-ultraviolet (UV) observations show a diversity of early-type galaxies depending on the amount of recent star formation (e.g., Ferreras & Silk 2000;Yi et al 2005;Schawinski et al 2007;Kaviraj et al 2007). The mid-infrared (IR) observations also show that a significant fraction of nearby early-type galaxies has excess flux over the photospheric emission (e.g., Bressan et al 2006;Clemens et al 2009;Ko et al 2009Ko et al , 2012Shim et al 2011;Hwang et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Recent stellar population models (e.g., Maraston 2005;Bruzual 2009) suggest that AGB stars with 0.1-1.5 Gyr can contribute up to ∼50% of the K-band light in galaxies. Although the understanding of AGB dust envelopes and their contribution to the mid-IR emission in a galaxy is far from complete (e.g., Marigo et al 2008), recent mid-IR observations show that a significant fraction of early-type galaxies on the red sequence have excess flux over photospheric emission (Ko et al 2009(Ko et al , 2012Shim et al 2011;Hwang et al 2012). Unusual polycyclic aromatic hydrocarbons (PAHs) are also detected in the mid-IR spectra of early-type galaxies (e.g., Kaneda et al 2008;Vega et al 2010;Panuzzo et al 2011), even though the PAH emission is a typical feature of star-forming galaxies (e.g., Peeters et al 2004).…”

Section: Introductionmentioning

confidence: 99%

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The Mid-Infrared and Near-Ultraviolet Excess Emissions of Quiescent Galaxies on the Red Sequence

Ko¹,

Hwang²,

Lee³

et al. 2013

ApJ

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We study the mid-infrared (IR) and near-ultraviolet (UV) excess emissions of spectroscopically selected quiescent galaxies on the optical red sequence. We use the Wide-field Infrared Survey Explorer mid-IR and Galaxy Evolution Explorer near-UV data for a spectroscopic sample of galaxies in the Sloan Digital Sky Survey Data Release 7 to study the possible connection between quiescent red-sequence galaxies with and without mid-IR/near-UV excess. Among 648 12 μm detected quiescent red-sequence galaxies without Hα emission, 26% and 55% show near-UV and mid-IR excess emissions, respectively. When we consider only bright (M r < −21.5) galaxies with an early-type morphology, the fraction of galaxies with recent star formation is still 39%. The quiescent red-sequence galaxies with mid-IR and near-UV excess emissions are optically fainter and have slightly smaller D n 4000 than those without mid-IR and near-UV excess emissions. We also find that mid-IR weighted mean stellar ages of quiescent red-sequence galaxies with mid-IR excess are larger than those with near-UV excess, and smaller than those without mid-IR and near-UV excess. The environmental dependence of the fraction of quiescent red-sequence galaxies with mid-IR and near-UV excess seems strong even though the trends of quiescent red-sequence galaxies with near-UV excess differ from those with mid-IR excess. These results indicate that the recent star formation traced by near-UV ( 1 Gyr) and mid-IR ( 2 Gyr) excess is not negligible among nearby, quiescent, red, early-type galaxies. We suggest a possible evolutionary scenario of quiescent red-sequence galaxies from quiescent red-sequence galaxies with near-UV excess to those with mid-IR excess to those without near-UV and mid-IR excess.

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Section: Environmental Dependence Of Near-uv and Mid-ir Excess Galaxiessupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Mid-Infrared and Near-Ultraviolet Excess Emissions of Quiescent Galaxies on the Red Sequence

Ko¹,

Hwang²,

Lee³

et al. 2013

ApJ

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“…A similar approach was successfully applied to photometry of blended sources in previous works (e.g. Ko et al 2009). In heavily confused images, photometry with simultaneous PSF-fitting for multiple sources may be a better solution.…”

Section: Photometry and Band-mergingmentioning

confidence: 97%

The AKARI NEP-Deep survey: a mid-infrared source catalogue

Takagi

Matsuhara

Goto

et al. 2011

A&A

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We present a new catalogue of mid-IR sources using the AKARI NEP-Deep survey. The InfraRed Camera (IRC) onboard AKARI has a comprehensive mid-IR wavelength coverage with 9 photometric bands at 2-24 μm. We utilized all of these bands to cover a nearly circular area adjacent to the north ecliptic pole (NEP). We designed the catalogue to include most of sources detected in 7, 9, 11, 15 and 18 μm bands, and found 7284 sources in a 0.67 deg 2 area. From our simulations, we estimate that the catalogue is ∼80 per cent complete to 200 μJy at 15-18 μm, and ∼10 per cent of sources are missed, owing to source blending. Star-galaxy separation is conducted using only AKARI photometry, as a result of which 10 per cent of catalogued sources are found to be stars. The number counts at 11, 15, 18, and 24 μm are presented for both stars and galaxies. A drastic increase in the source density is found in between 11 and 15 μm at the flux level of ∼300 μJy. This is likely due to the redshifted PAH emission at 8 μm, given our rough estimate of redshifts from an AKARI colour-colour plot. Along with the mid-IR source catalogue, we present optical-NIR photometry for sources falling inside a Subaru/Sprime-cam image covering part of the AKARI NEP-Deep field, which is deep enough to detect most of AKARI mid-IR sources, and useful to study optical characteristics of a complete mid-IR source sample.

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Space missions for astronomy and astrophysics in Korea: past, present, and future

Seon

Han

Lee

et al. 2021

J. Korean Phys. Soc.

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We review the history of space missions in Korea focusing on the field of astronomy and astrophysics. For each mission, scientific motivation and achievement are reviewed together with some technical details of the program, including mission schedule. This review includes ongoing and currently approved missions, as well as some planned ones. Within the admitted limitations of the authors' perspectives, some comments on the future direction of the space program for astronomy and astrophysics in Korea are made at the end of this review.

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THE MID-INFRARED VIEW OF RED SEQUENCE GALAXIES IN ABELL 2218 WITH AKARI

Cited by 17 publications

References 34 publications

The Mid-Infrared and Near-Ultraviolet Excess Emissions of Quiescent Galaxies on the Red Sequence

The Mid-Infrared and Near-Ultraviolet Excess Emissions of Quiescent Galaxies on the Red Sequence

The AKARI NEP-Deep survey: a mid-infrared source catalogue

Space missions for astronomy and astrophysics in Korea: past, present, and future

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