J/ApJS/214/19 Suprime-Cam wide-field photometry of Leo A (Stonkute+, 2014)
Dwarf irregular galaxy Leo A: Suprime-Cam wide-field stellar photometry.
Stonkute R., Arimoto N., Hasegawa T., Narbutis D., Tamura N.,
Vansevicius V.
<Astrophys. J. Suppl. Ser., 214, 19 (2014)>
=2014ApJS..214...19S 2014ApJS..214...19S
ADC_Keywords: Photometry, UBVRI ; Galaxy catalogs ; Galaxies, nearby
Keywords: catalogs; galaxies: dwarf; galaxies: individual: Leo A;
galaxies: irregular; galaxies: stellar content;
techniques: photometric
Abstract:
We have surveyed a complete extent of Leo A --an apparently isolated
gas-rich low-mass dwarf irregular galaxy in the Local Group. The B, V,
and I passband CCD images (typical seeing ∼0.8") were obtained with
the Subaru Telescope equipped with the Suprime-Cam mosaic camera. The
wide-field (20'x24') photometry catalog of 38856 objects (V∼16-26mag)
is presented. This survey is also intended to serve as "a finding
chart" for future imaging and spectroscopic observation programs of
Leo A.
Description:
We observed Leo A on two nights in 2001 November. Images of Leo A were
acquired through the B, V, and IC (tagged as "I" throughout)
Johnson-Cousins system passbands in clear sky and good seeing
conditions (FWHM of stellar images, FWHM∼0.8"). The analyzed field was
centered at RA=9:59:26.0, DEC=+30:46:50.0 (J2000), i.e., slightly
above the central part of Leo A, to keep the main body of galaxy
around the middle of a single CCD; see Figure 1 for the stacked mosaic
color image of the survey field.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 99 38856 The Suprime-Cam photometry catalog in Leo A field
fits/* . 4 Individual FITS Suprime-Cam images of the Leo A
galaxy in B, V and Ic passbands (see figure 1)
fits.dat 115 3 List of FITS file in subdirectory fits
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See also:
I/284 : The USNO-B1.0 Catalog (Monet+ 2003)
J/MNRAS/439/1015 : Red giants velocities in 7 LG dwarf galaxies (Kirby+, 2014)
J/ApJ/697/1993 : Spitzer study of AGB stars. III. (Boyer+, 2009)
J/AJ/123/3154 : RV light curves of variable stars in Leo A (Dolphin+, 2002)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- ID Source identifier (JHHMMSS.ss+DDMMSS.s)
21- 22 I2 h RAh [9/10] Hour of Right Ascension (J2000) (1)
24- 25 I2 min RAm Minute of Right Ascension (J2000) (1)
27- 32 F6.3 s RAs Second of Right Ascension (J2000) (1)
34- 34 A1 --- DE- [+] Sign of the Declination (J2000) (1)
35- 36 I2 deg DEd [30] Degree of Declination (J2000) (1)
38- 39 I2 arcmin DEm [34/58] Arcminute of Declination (J2000) (1)
41- 45 F5.2 arcsec DEs Arcsecond of Declination (J2000) (1)
47- 52 F6.3 mag Vmag [16.3/26.9] The Subaru/Suprime-Cam
Johnson V band magnitude
54- 59 F6.3 mag B-V [-1.3/2.8]? The Johnson (B-V) color index
61- 66 F6.3 mag V-I [-0.9/5]? The Johnson-Cousins (V-Ic) color index
68- 72 F5.3 mag e_Vmag [0.004/0.9] The 1σ error in Vmag
74- 78 F5.3 mag e_B-V ? The 1σ error in B-V (2)
80- 84 F5.3 mag e_V-I ? The 1σ error in V-I (2)
86- 86 I1 --- o_Vmag [2/5] Number of Vmag observations
88- 92 F5.2 --- sharp [-6/4]? DAOPHOT V band sharpness parameter (3)
94- 97 F4.2 --- chi2 [0.1/3]? DAOPHOT V band χ2 value (3)
99- 99 I1 --- S/G Classification (0=star, 1=extended object) (4)
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Note (1): R.A. and decl. (J2000) coordinates in the USNO-B1.0 catalog
(I/284) system. The astrometric World Coordinate System solution of the
reference V passband mosaic was derived by cross-correlating a list of
reference objects with the USNO-B1.0 catalog of standard astrometric
stars using IRAF's ccmap (see section 2.2 for further explanations).
Note (2): Photometric errors are:
σB-V = (σ2B+σ2V)1/2
σV-I = (σ2V+σ2I)1/2
Note (3): Sharpness and χ2-DAOPHOT parameters of PSF model fitting
in V passband; not available for bright stars (V≲20mag) measured by
aperture photometry in "short" exposure frames. For good point-source
fits, "chi2" is close to 1 and "sharp" close to 0.
Note (4): Classification based on PSF model fitting and visual inspection
of images.
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Byte-by-byte Description of file: fits.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg [149.85681] Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg [+30.81069] Declination of center (J2000)
20- 24 F5.3 arcsec/pix scale [0.202] Scale of the image
26- 29 I4 --- Nx [5940] Number of pixels along X-axis
30 A1 --- --- [x]
31- 34 I4 --- Ny [7140] Number of pixels along Y-axis
36- 40 I5 Kibyte size [82842] Size of FITS file
42- 53 A12 --- FileName Name of FITS file, in subdirectory fits
55-115 A61 --- Text Title of the FITS file
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 14-Oct-2014