J/ApJ/912/49 Clumps identified in z<0.06 SDSS Stripe 82 sample (Mehta+, 2021)
Investigating clumpy galaxies in the Sloan Digital Sky Survey Stripe 82 using
the Galaxy Zoo.
Mehta V., Scarlata C., Fortson L., Dickinson H., Adams D., Chevallard J.,
Charlot S., Beck M., Kruk S., Simmons B.
<Astrophys. J., 912, 49 (2021)>
=2021ApJ...912...49M 2021ApJ...912...49M
ADC_Keywords: Galaxies, optical; Photometry, SDSS; Abundances; Redshifts;
Star Forming Region; Extinction
Keywords: Star forming regions ; Starburst galaxies ; Galaxy evolution ;
Galaxy formation ; Star formation ; Observational astronomy ;
Catalogs
Abstract:
Giant, star-forming clumps are a common feature prevalent among
high-redshift star-forming galaxies and play a critical role in
shaping their chaotic morphologies and yet, their nature and role in
galaxy evolution remains to be fully understood. A majority of the
effort to study clumps has been focused at high redshifts, and local
clump studies have often suffered from small sample sizes. In this
work, we present an analysis of clump properties in the local
universe, and for the first time, performed with a statistically
significant sample. With the help of the citizen science-powered
Galaxy Zoo: Hubble project, we select a sample of 92 z<0.06 clumpy
galaxies in Sloan Digital Sky Survey Stripe 82 galaxies. Within this
sample, we identify 543 clumps using a contrast-based image analysis
algorithm and perform photometry as well as estimate their stellar
population properties. The overall properties of our z<0.06 clump
sample are comparable to the high-redshift clumps. However, contrary
to the high-redshift studies, we find no evidence of a gradient in
clump ages or masses as a function of their galactocentric distances.
Our results challenge the inward migration scenario for clump
evolution for the local universe, potentially suggesting a larger
contribution of ex situ clumps and/or longer clump migration
timescales.
Description:
For all analysis presented in this work, we use the coadd-epoch
Stripe 82 images to utilize the deepest available data for our
targets. Specifically, we use the sky-subtracted, calibrated images
("corrected" frames) for Stripe 82 coadd runs 106 and 206 available as
part of SDSS DR7. See Section 2.3.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 867 543 The clump catalog
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See also:
V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
J/ApJ/453/48 : VI photometry of HST faint field galaxies (Driver+ 1995)
J/AJ/112/359 : Galaxies in the Hubble Deep Field (van den Bergh+ 1996)
J/ApJ/631/85 : Galaxy morphologies in the Hubble UDF (Elmegreen+, 2005)
J/A+A/448/955 : Abundances of emission galaxies in SDSS-DR3 (Izotov+, 2006)
J/MNRAS/435/2835 : Morphological types from Galaxy Zoo 2 (Willett+, 2013)
J/ApJ/794/120 : Sloan Digital Sky Survey coadd. Stripe 82 (Annis+, 2014)
J/A+A/581/A103 : CALIFA survey across the Hubble sequence (Gonzalez+, 2015)
J/A+A/604/A4 : CALIFA galaxies observational hints (Ruiz-Lara+, 2017)
J/ApJ/853/108 : Clumpy galaxies in CANDELS. II. 0.5≤z<3.0 (Guo+, 2018)
J/ApJS/234/35 : Stellar pop. synthesis of clumps (Zaragoza-Cardiel+, 2018)
J/ApJ/888/92 : Star-forming clumps in luminous IR galaxies (Larson+, 2020)
J/ApJ/889/154 : LEGUS obs. of NGC4449 star clusters (Whitmore+, 2020)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 A19 --- ID Galaxy Identification number in SDSS
Stripe 82 coadd-epoch catalog
21- 37 F17.13 deg RAGdeg Right Ascension of the galaxy center of
mass (CoM) (J2000) (ra)
39- 54 F16.13 deg DEGdeg [-1.25/1.25] Declination of the galaxy
center of mass (CoM) (J2000) (dec)
56- 61 F6.4 --- zDR14 [0.0059/0.06] Galaxy redshift available
from DR14 (redshift)
63- 81 A19 --- SpObjID SDSS spectrum ID number centered on the
galaxy, if available (specobjid)
83- 85 I3 --- Run [106/206] SDSS run number
87 I1 --- ReRun [2] SDSS rerun number
89 I1 --- CamCol [1/6] SDSS camera column
91- 93 I3 --- Field [79/779] SDSS field number
95- 98 I4 --- Obj [12/1639] SDSS object ID within the field
100- 103 F4.2 arcsec uPSF [1.26/1.71] u-band PSF FWHM (psf-fwhm-u)
105- 108 F4.2 arcsec gPSF [1.25/1.53] g-band PSF FWHM (psf-fwhm-g)
110- 113 F4.2 arcsec rPSF [1.11/1.52] r-band PSF FWHM (psf-fwhm-r)
115- 118 F4.2 arcsec iPSF [1.03/1.5] i-band PSF FWHM (psf-fwhm-i)
120- 123 F4.2 arcsec zPSF [1.06/1.5] z-band PSF FWHM (psf-fwhm-z)
125- 129 F5.2 arcsec Reff [2.31/14.07] Galaxy effective radius
(gal_reff)
131- 135 F5.2 arcsec amaj [2.45/18.07] Galaxy semi-major axis
(gal_sma)
137- 140 F4.2 arcsec bmin [0/9.24] Galaxy semi-minor axis (gal_smb)
142- 147 F6.2 deg PA [-45/44] Galaxy position angle (gal_theta)
149- 156 F8.3 uJy Fu [106/3189] Flux within a Kron-like
elliptical (AUTO) u-band aperture
(galfluxu)
158- 162 F5.3 uJy e_Fu [0.9/9] Error for AUTO u-band flux
(galfluxerru)
164- 170 F7.4 mag umag [15.14/18.83] Kron-like elliptical (AUTO)
aperture u-band magnitude (galmagu)
172- 177 F6.4 mag e_umag [0.0013/0.03] Error on AUTO u-band
magnitude (galmagerru)
179- 186 F8.3 uJy Fg [284/8322] Flux within a Kron-like
elliptical (AUTO) g-band aperture
(galfluxg)
188- 192 F5.3 uJy e_Fg [0.62/4.11] Error for AUTO g-band flux
(galfluxerrg)
194- 200 F7.4 mag gmag [14.09/17.77] Kron-like elliptical (AUTO)
aperture g-band magnitude (galmagg)
202- 207 F6.4 mag e_gmag [0.0002/0.006] Error on AUTO g-band
magnitude (galmagerrg)
209- 217 F9.3 uJy Fr [332/13235] Flux within a Kron-like
elliptical (AUTO) r-band aperture
(galfluxr)
219- 223 F5.3 uJy e_Fr [0.93/5.7] Error for AUTO r-band flux
(galfluxerrr)
225- 231 F7.4 mag rmag [13.59/17.6] Kron-like elliptical (AUTO)
aperture r-band magnitude (galmagr)
233- 238 F6.4 mag e_rmag [0.0002/0.006] Error on AUTO r-band
magnitude (galmagerrr)
240- 248 F9.3 uJy Fi [327/16184] Flux within a Kron-like
elliptical (AUTO) i-band aperture
(galfluxi)
250- 254 F5.3 uJy e_Fi [1.53/8.04] Error for AUTO i-band flux
(galfluxerri)
256- 262 F7.4 mag imag [13.37/17.62] Kron-like elliptical (AUTO)
aperture i-band magnitude (galmagi)
264- 269 F6.4 mag e_imag [0.0002/0.008] Error on AUTO i-band
magnitude (galmagerri)
271- 279 F9.3 uJy Fz [328/18198] Flux within a Kron-like
elliptical (AUTO) z-band aperture
(galfluxz)
281- 286 F6.3 uJy e_Fz [5.35/30.52] Error for AUTO z-band flux
(galfluxerrz)
288- 294 F7.4 mag zmag [13.24/17.61] Kron-like elliptical (AUTO)
aperture z-band magnitude (galmagz)
296- 301 F6.4 mag e_zmag [0.0007/0.03] Error on AUTO z-band
magnitude (galmagerrz)
303- 308 F6.4 mag E(B-V) [0.019/0.16] Galactic extinction in
E(B-V) at galaxy position (galextebv)
310- 314 F5.3 mag Av [0.06/0.48] Galactic extinction in AV
at galaxy position (galextAV)
316- 322 F7.4 [Msun] logMs [7.44/11.12] Log stellar mass (gal_logMst)
324- 330 F7.4 [Msun] e_logMs [-0.24/0.14] Lower 1σ error in
logMs (gallogMstl68)
332- 338 F7.4 [Msun] E_logMs [-0.005/0.4] Upper 1σ error in
logMs (gallogMstu68)
340- 346 F7.4 [yr] logAge [7.51/10.14] Log stellar age (gal_logage)
348- 354 F7.4 [yr] e_logAge [-0.4/0.09] Lower 1σ error in
logAge (gallogagel68)
356- 362 F7.4 [yr] E_logAge [-0.011/1.61] Upper 1σ error in
logAge (gallogageu68)
364- 370 F7.4 [yr] logtau [6.5/10.5] Log star-formation timescale;
for exponential SFH (gal_logtau)
372- 378 F7.4 [yr] e_logtau [-1.05/0.9] Lower 1σ error in
logtau (gallogtaul68)
380- 386 F7.4 [yr] E_logtau [-0.12/2.74] Upper 1σ error in
logtau (gallogtauu68)
388- 395 F8.4 [Msun/yr] logSFR [/1.5]? Log star-formation rate
(gal_logSFR)
397- 403 F7.4 [Msun/yr] e_logSFR [-0.62/0.2]? Lower 1σ error in
logSFR (gallogSFRl68)
405- 411 F7.4 [Msun/yr] E_logSFR [-0.2/]? Upper 1σ error in logSFR
(gallogSFRu68)
412 A1 --- f_logSFR i=infinity
413- 419 F7.4 [Sun] Z [-2.2/0.12] Log stellar metallicity
(galZstar)
421- 427 F7.4 [Sun] e_Z [-1.2/0.03] Lower 1σ error in Z
(galZstar_l68)
429- 435 F7.4 [Sun] E_Z [-1.07/1.2] Upper 1σ error in Z
(galZstar_u68)
437- 442 F6.4 [-] logOH [6.5/8.9] Gas-phase metallicity;
log(OH)+12 (gal_logOH)
444- 450 F7.4 [-] e_logOH [-1.2/0.022] Lower 1σ error in
logOH (gallogOHl68)
452- 458 F7.4 [-] E_logOH [-1.07/1.2] Upper 1σ error in logOH
(gallogOHu68)
460- 465 F6.4 mag Av5500 [0/1.51] Attenuation at 5500Å (gal_AV)
467- 473 F7.4 mag e_Av5500 [-0.9/0.015] Lower 1σ error in
Av5500 (galAVl68)
475- 481 F7.4 mag E_Av5500 [-0.04/0.26] Upper 1σ error in
Av5500 (galAVu68)
483- 484 I2 --- Clump [1/48] Clump identification number
(clump_id)
486- 502 F17.13 deg RAdeg Clump Right Ascension (J2000) (clump_ra)
504- 519 F16.13 deg DEdeg [-1.25/1.25] Clump Declination (J2000)
(clump_dec)
521- 539 A19 --- ClspID SDSS spectrum ID number centered on the
clump, if available (clump_specobjid)
541 I1 --- Prox [0/1] Proximity flag for the clump
(clumpproxflag)
543- 548 F6.3 arcsec ClDist [1.29/40.87] Clump galactocentric
distance (clump_distance)
550- 554 F5.3 --- ClDreff [0.15/4.68] Clump galactocentric distance
normalized by galaxy effective radius
(clump_distnorm)
556- 560 F5.3 --- ClDamaj [0.12/3.3] Clump galactocentric distance
normalized by galaxy semi-major axis
(clumpdistsma)
562- 567 F6.3 kpc ClGC [0.26/16.38] Clump galactocentric
distance (clump_distphys)
569- 574 F6.3 uJy ClFu [0/88.32] Flux within a Kron-like
elliptical (AUTO) u-band aperture
(clumpfluxu)
576- 580 F5.3 uJy e_ClFu [0.12/0.31] Error for AUTO u-band flux
(clumpfluxerru)
582- 589 F8.4 mag Clumag [19/27.2]?=-99 Kron-like elliptical (AUTO)
aperture u-band magnitude (clumpmagu)
591- 598 F8.4 mag e_Clumag [0.002/4]?=-99 Error on AUTO u-band
magnitude (clumpmagerru)
600- 606 F7.3 uJy ClFg [0/178] Flux within a Kron-like
elliptical (AUTO) g-band aperture
(clumpfluxg)
608- 612 F5.3 uJy e_ClFg [0.06/0.2] Error for AUTO g-band flux
(clumpfluxerrg)
614- 621 F8.4 mag Clgmag [18/24.6]?=-99 Kron-like elliptical (AUTO)
aperture g-band magnitude (clumpmagg)
623- 630 F8.4 mag e_Clgmag [0.0006/0.3]?=-99 Error on AUTO g-band
magnitude (clumpmagerrg)
632- 638 F7.3 uJy ClFr [0/176] Flux within a Kron-like
elliptical (AUTO) r-band aperture
(clumpfluxr)
640- 644 F5.3 uJy e_ClFr [0.12/0.2] Error for AUTO r-band flux
(clumpfluxerrr)
646- 653 F8.4 mag Clrmag [18/23.8]?=-99 Kron-like elliptical (AUTO)
aperture r-band magnitude (clumpmagr)
655- 662 F8.4 mag e_Clrmag [0.001/0.2]?=-99 Error on AUTO r-band
magnitude (clumpmagerrr)
664- 670 F7.3 uJy ClFi [0/201] Flux within a Kron-like
elliptical (AUTO) i-band aperture
(clumpfluxi)
672- 676 F5.3 uJy e_ClFi [0.19/0.3] Error for AUTO i-band flux
(clumpfluxerri)
678- 685 F8.4 mag Climag [18/24.7]?=-99 Kron-like elliptical (AUTO)
aperture i-band magnitude (clumpmagi)
687- 694 F8.4 mag e_Climag [0.001/0.5]?=-99 Error on AUTO i-band
magnitude (clumpmagerri)
696- 702 F7.3 uJy ClFz [0/223] Flux within a Kron-like
elliptical (AUTO) z-band aperture
(clumpfluxz)
704- 708 F5.3 uJy e_ClFz [0.7/1.2] Error for AUTO z-band flux
(clumpfluxerrz)
710- 717 F8.4 mag Clzmag [18/27.1]?=-99 Kron-like elliptical (AUTO)
aperture z-band magnitude (clumpmagz)
719- 726 F8.4 mag e_Clzmag [0.004/17.22]?=-99 Error on AUTO z-band
magnitude (clumpmagerrz)
728- 733 F6.4 [Msun] CllogMs [4/9.6] Log stellar mass (clump_logMst)
735- 741 F7.4 [Msun] e_CllogMs [-0.6/1.2] Lower 1σ error on
CllogMs (clumplogMstl68)
743- 749 F7.4 [Msun] E_CllogMs [-0.1/1.5] Upper 1σ error on
CllogMs (clumplogMstu68)
751- 757 F7.4 [yr] CllogAge [6/10.2] Log stellar age (clump_logage)
759- 765 F7.4 [yr] e_CllogAge [-1.63/2.3] Lower 1σ error on
CllogAge (clumplogagel68)
767- 773 F7.4 [yr] E_CllogAge [-0.15/3.3] Upper 1σ error on
CllogAge (clumplogageu68)
775- 781 F7.4 [Msun/yr] CllogSFR [-3.75/1.1] Log star-formation rate
(clump_logSFR)
783- 789 F7.4 [Msun/yr] e_CllogSFR [-1.56/0.3] Lower 1σ error on
CllogSFR (clumplogSFRl68)
791- 797 F7.4 [Msun/yr] E_CllogSFR [-0.9/0.91] Upper 1σ error on
CllogSFR (clumplogSFRu68)
799- 805 F7.4 [Sun] ClZ [-1.52/0.007] Log stellar metallicity
(clumpZstar)
807- 813 F7.4 [Sun] e_ClZ [-1.03/0.21] Lower 1σ error on ClZ
(clumpZstar_l68)
815- 821 F7.4 [Sun] E_ClZ [-0.2/0.94] Upper 1σ error on ClZ
(clumpZstar_u68)
823- 828 F6.4 [-] CllogOH [7.19/8.72] Gas-phase metallicity;
log(OH)+12 (clump_logOH)
830- 836 F7.4 [-] e_CllogOH [-1.04/0.21] Lower 1σ error on
CllogOH (clumplogOHl68)
838- 844 F7.4 [-] E_CllogOH [-0.2/0.95] Upper 1σ error on
CllogOH (clumplogOHu68)
846- 851 F6.4 mag ClAv [0/4.4] Attenuation at 5500Å (clump_AV)
853- 859 F7.4 mag e_ClAv [-1.9/0.1] Lower 1σ error on ClAv
(clumpAVl68)
861- 867 F7.4 mag E_ClAv [-0.72/1.02] Upper 1σ error on ClAv
(clumpAVu68)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 26-Oct-2022