J/ApJ/857/104 Low surface brightness galaxies from HSC-SSP (Greco+, 2018)
Illuminating low surface brightness galaxies with the Hyper Suprime-Cam survey.
Greco J.P., Greene J.E., Strauss M.A., Macarthur L.A., Flowers X.,
Goulding A.D., Huang S., Kim Ji H., Komiyama Y., Leauthaud A., Leisman L.,
Lupton R.H., Sifon C., Wang S.-Y.
<Astrophys. J., 857, 104 (2018)>
=2018ApJ...857..104G 2018ApJ...857..104G
ADC_Keywords: Galaxies, photometry ; Photometry, VRI; Photometry, ultraviolet;
Morphology; Extinction; Surveys
Keywords: galaxies: dwarf ; galaxies: general
Abstract:
We present a catalog of extended low surface brightness galaxies
(LSBGs) identified in the Wide layer of the Hyper Suprime-Cam Subaru
Strategic Program (HSC-SSP). Using the first ∼200deg2 of the survey,
we have uncovered 781 LSBGs, spanning red (g-i≥0.64) and blue
(g-i<0.64) colors and a wide range of morphologies. Since we focus on
extended galaxies (reff=2.5"-14"), our sample is likely dominated by
low-redshift objects. We define LSBGs to have mean surface
brightnesses {bar}mueff(g)>24.3mag/arcsec2, which allows
nucleated galaxies into our sample. As a result, the central surface
brightness distribution spans a wide range of
µ0(g)=18-27.4mag/arcsec2, with 50% and 95% of galaxies fainter
than 24.3 and 22mag/arcsec2, respectively. Furthermore, the surface
brightness distribution is a strong function of color, with the red
distribution being much broader and generally fainter than that of the
blue LSBGs, and this trend shows a clear correlation with galaxy
morphology. Red LSBGs typically have smooth light profiles that are
well characterized by single-component Sersic functions. In contrast,
blue LSBGs tend to have irregular morphologies and show evidence for
ongoing star formation. We cross-match our sample with existing
optical, HI, and ultraviolet catalogs to gain insight into the
physical nature of the LSBGs. We find that our sample is diverse,
ranging from dwarf spheroidals and ultradiffuse galaxies in nearby
groups to gas-rich irregulars to giant LSB spirals, demonstrating the
potential of the HSC-SSP to provide a truly unprecedented view of the
LSBG population.
Description:
Our search is based on the first ∼200deg2 from the Wide layer of the
Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP; internal data
release S16A), an ambitious 300-night imaging survey using the Hyper
Suprime-Cam on the 8.2m Subaru Telescope. An overview of the full
survey design is given in Aihara+ (2018PASJ...70S...4A 2018PASJ...70S...4A), and the first
public data release, which covers ∼100deg2, is described in Aihara+
(2018PASJ...70S...8A 2018PASJ...70S...8A).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 103 781 Low-surface-brightness galaxy catalog
table2.dat 48 374 Archival GALEX measurements
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See also:
II/344 : KiDS-ESO-DR2 multi-band source catalog (de Jong+, 2015)
II/335 : Revised cat. of GALEX UV sources (AIS GR6+7) (Bianchi+ 2017)
J/ApJS/105/209 : Low surface brightness galaxies. I. (Impey+ 1996)
J/AJ/127/704 : Low surface brightness galaxies in SDSS (Kniazev+, 2004)
J/MNRAS/352/478 : HI obs. of LSB dwarf galaxies (Roberts+, 2004)
J/AJ/130/873 : Properties of BQS objects in SDSS DR3 area (Jester+, 2005)
J/AJ/130/1502 : NGC 5846 group: photometry and spectroscopy (Mahdavi+, 2005)
J/AJ/130/2647 : Tidal features of 126 nearby red gal. (van Dokkum+, 2005)
J/ApJ/653/240 : Low-mass SDSS dwarf galaxy properties (Geha+, 2006)
J/AJ/134/579 : Morphologically classified gal. from SDSS (Fukugita+, 2007)
J/ApJS/173/293 : UV-Optical galaxy color-magnitude diagram I. (Wyder+, 2007)
J/A+A/511/A12 : Low-luminosity gal. in NGC 5846 group (Eigenthaler+, 2010)
J/AJ/142/199 : Sizes and luminosities of stellar systems (Brodie+, 2011)
J/AJ/142/170 : ALFALFA survey: α.40 HI source catalog (Haynes+, 2011)
J/AJ/144/4 : Dwarf galaxies in the Local Group (McConnachie+, 2012)
J/ApJ/765/28 : CFHTLS galaxies with faint tidal features (Atkinson+, 2013)
J/ApJ/809/146 : SDSS-DR8 isolated low-mass galaxies (Bradford+, 2015)
J/MNRAS/446/120 : ATLAS3D project. XXIX (Duc+, 2015)
J/ApJ/813/L15 : Dwarf galaxies in Fornax cluster from NGFS (Munoz+, 2015)
J/MNRAS/456/1359 : IAC Stripe 82 Legacy Project: Photometry (Fliri+, 2016)
J/ApJS/225/11 : Subaru-UDGs in the Coma cluster (Yagi+, 2016)
J/ApJ/842/133 : HI-bearing ultra-diffuse ALFALFA galaxies (Leisman+, 2017)
http://www.galex.caltech.edu/ : GALEX home page
http://hsc-release.mtk.nao.ac.jp/doc/ : HSC-SSP DR1 home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/781] Unique LSBG identifier
5- 13 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000)
15- 22 F8.5 deg DEdeg Declination in decimal degrees (J2000)
24- 28 F5.2 mag/arcsec2 iSB [17/26.4] The i-band central
surface brightness
30- 33 F4.2 mag/arcsec2 e_iSB [0.4/0.5] Uncertainty in iSB
35- 39 F5.2 mag imag [16.9/23] Subaru/Hyper Suprime-Cam (HSC)
apparent i-band AB magnitude (1)
41- 44 F4.2 mag e_imag [0.2/0.4] Uncertainty in imag
46- 49 F4.2 mag g-r [0.05/1] The (g-r) color index (1)
51- 54 F4.2 mag g-i [0.05/1.5] The (g-i) color index (1)
56- 60 F5.2 arcsec Reff [2.5/14] Effective radius
62- 65 F4.2 arcsec e_Reff [0.7/1.1] Uncertainty in Reff
67- 70 F4.2 --- n [0.1/4.3] Sersic index
72- 75 F4.2 --- e_n [0.3/0.5] Uncertainty in n
77- 80 F4.2 --- Ell [0.02/0.7] Ellipticity
82- 85 F4.2 --- e_Ell [0.03/0.2] Uncertainty in Ell
87- 91 F5.3 mag Ag [0.02/0.5] g-band Galactic extinction (2)
93- 97 F5.3 mag Ar [0.01/0.4] r-band Galactic extinction (2)
99-103 F5.3 mag Ai [0.01/0.3] i-band Galactic extinction (2)
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Note (1): Not corrected for Galactic extinction.
Note (2): Derived from the Schlafly & Finkbeiner (2011ApJ...737..103S 2011ApJ...737..103S)
recalibration of the Schlegel+ (1998ApJ...500..525S 1998ApJ...500..525S) dust maps.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [5/780] Unique LSBG identifier (1)
5- 13 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000) (2)
15- 22 F8.5 deg DEdeg Declination in decimal degrees (J2000) (2)
24- 28 F5.2 mag NUVmag [18.4/25.3] GALEX NUV band AB magnitude (3)
30- 33 F4.2 mag e_NUVmag [0.01/1.8] Uncertainty in NUVmag
35- 39 F5.2 mag FUVmag [18.6/24.2]? GALEX FUV band AB magnitude (3)
41- 44 F4.2 mag e_FUVmag [0.03/0.6]? Uncertainty in FUVmag
46- 48 A3 --- Survey GALEX survey name
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Note (1): LSBG identifiers correspond to those in Table 1.
Note (2): Coordinates are those of the matched source in the
GALEX source catalog.
Note (3): Not corrected for Galactic extinction.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 25-Feb-2019