MEASURING THE STELLAR MASSES OF z ∼ 7 GALAXIES WITH THE SPITZER ULTRAFAINT SURVEY PROGRAM (SURFS UP)

MEASURING THE STELLAR MASSES OF z ∼ 7 GALAXIES WITH THE SPITZER ULTRAFAINT SURVEY PROGRAM (SURFS UP)

We present Spitzer/IRAC observations of nine z-band dropouts highly magnified (2 [ ~] 7. By modeling the broadband photometry, we estimate the galaxy has an intrinsic star formation rate (SFR) of SFR ~ 1.3 M sub([miidot in circle]) yr super(-1) and stellar mass of M ~ 2.0 x 10 super(9) M sub(middot...

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Veröffentlicht in:Astrophysical journal. Letters 2014-05, Vol.786 (1), p.1-6
Hauptverfasser: RYAN, R E, Gonzalez, A H, Lemaux, B C, Bradac, M, Casertano, S, Allen, S, Cain, B, Gladders, M, Hall, N, HILDEBRADT, H
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Arrays
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
CAMERAS
COMPUTERIZED SIMULATION
Estimates
GALACTIC EVOLUTION
GALAXIES
LUMINOSITY
MASS
PHOTOMETRY
Projectiles
RED SHIFT
Star formation rate
STARS
Stellar mass
Surf
ULTRAVIOLET RADIATION
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container_issue 1
container_start_page 1
container_title Astrophysical journal. Letters
container_volume 786
creator RYAN, R E
Gonzalez, A H
Lemaux, B C
Bradac, M
Casertano, S
Allen, S
Cain, B
Gladders, M
Hall, N
HILDEBRADT, H
description We present Spitzer/IRAC observations of nine z-band dropouts highly magnified (2 [ ~] 7. By modeling the broadband photometry, we estimate the galaxy has an intrinsic star formation rate (SFR) of SFR ~ 1.3 M sub([miidot in circle]) yr super(-1) and stellar mass of M ~ 2.0 x 10 super(9) M sub(middot in circle]), which gives a specific star formation rate of sSFR ~ 0.7 Gyr super(-1). If this galaxy had sustained this SFR since z ~ 20, it could have formed the observed stellar mass (to within a factor of ~2). We also discuss alternate star formation histories and argue that the exponentially increasing model is unlikely. Finally, based on the intrinsic SFR, we estimate that this galaxy has a likely [CII] flux of [left angle bracket][functionof] sub([CII])[right angle bracket] = 1.6mJy.
doi_str_mv 10.1088/2041-8205/786/1/L4
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We combine archival imaging with our Exploratory program (SURFS UP), which results in a total integration time of ~30 hr per Infrared Array Camera (IRAC) band. We detect ([&gt; ~]3[sigma]) in both IRAC bands the brightest of these high-redshift galaxies, with [3.6] = 23.80 + or - 0.28 mag, [4.5] = 23.78 + or -0.25 mag, and (H - [3.6]) = 1.17+ or -0.32 mag. The remaining eight galaxies are undetected to [3.6] ~ 26.4 mag and [4.5] ~ 26.0 mag with stellar masses of ~5 x 10 super(7) M sub([middot in circle]). The detected galaxy has an estimated magnification of mu = 12+ or -4, which implies this galaxy has an ultraviolet luminosity of L sub(1500) ~ 0.3 L sub(z=7)*-; the lowest-luminosity individual source detected in IRAC at z [&gt; ~] 7. 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Letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>RYAN, R E</au><au>Gonzalez, A H</au><au>Lemaux, B C</au><au>Bradac, M</au><au>Casertano, S</au><au>Allen, S</au><au>Cain, B</au><au>Gladders, M</au><au>Hall, N</au><au>HILDEBRADT, H</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>MEASURING THE STELLAR MASSES OF z ∼ 7 GALAXIES WITH THE SPITZER ULTRAFAINT SURVEY PROGRAM (SURFS UP)</atitle><jtitle>Astrophysical journal. Letters</jtitle><date>2014-05-01</date><risdate>2014</risdate><volume>786</volume><issue>1</issue><spage>1</spage><epage>6</epage><pages>1-6</pages><issn>2041-8205</issn><eissn>2041-8213</eissn><abstract>We present Spitzer/IRAC observations of nine z-band dropouts highly magnified (2 [&lt;, ~] mu [&lt;, ~] 12) by the Bullet Cluster. We combine archival imaging with our Exploratory program (SURFS UP), which results in a total integration time of ~30 hr per Infrared Array Camera (IRAC) band. We detect ([&gt; ~]3[sigma]) in both IRAC bands the brightest of these high-redshift galaxies, with [3.6] = 23.80 + or - 0.28 mag, [4.5] = 23.78 + or -0.25 mag, and (H - [3.6]) = 1.17+ or -0.32 mag. The remaining eight galaxies are undetected to [3.6] ~ 26.4 mag and [4.5] ~ 26.0 mag with stellar masses of ~5 x 10 super(7) M sub([middot in circle]). The detected galaxy has an estimated magnification of mu = 12+ or -4, which implies this galaxy has an ultraviolet luminosity of L sub(1500) ~ 0.3 L sub(z=7)*-; the lowest-luminosity individual source detected in IRAC at z [&gt; ~] 7. By modeling the broadband photometry, we estimate the galaxy has an intrinsic star formation rate (SFR) of SFR ~ 1.3 M sub([miidot in circle]) yr super(-1) and stellar mass of M ~ 2.0 x 10 super(9) M sub(middot in circle]), which gives a specific star formation rate of sSFR ~ 0.7 Gyr super(-1). If this galaxy had sustained this SFR since z ~ 20, it could have formed the observed stellar mass (to within a factor of ~2). We also discuss alternate star formation histories and argue that the exponentially increasing model is unlikely. 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source IOP Publishing Free Content; EZB-FREE-00999 freely available EZB journals; IOPscience extra; Alma/SFX Local Collection
subjects Arrays
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
CAMERAS
COMPUTERIZED SIMULATION
Estimates
GALACTIC EVOLUTION
GALAXIES
LUMINOSITY
MASS
PHOTOMETRY
Projectiles
RED SHIFT
Star formation rate
STARS
Stellar mass
Surf
ULTRAVIOLET RADIATION
title MEASURING THE STELLAR MASSES OF z ∼ 7 GALAXIES WITH THE SPITZER ULTRAFAINT SURVEY PROGRAM (SURFS UP)
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