J/ApJS/277/33 COSMIC-S SMC photometric catalogue (Franco+, 2025)
COSMIC-S: A photometric catalog of observed stars in the Small Magellanic Cloud.
Franco A., Nucita A.A., De Paolis F., Strafella F.
<Astrophys. J. Suppl. Ser. 277, 33 (2025)>
=2025ApJS..277...33F 2025ApJS..277...33F (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Magellanic Clouds ; Photometry ; Optical ; Stars, normal
Keywords: catalogs - Small Magellanic Cloud - stellar photometry
Abstract:
The Dark Energy Camera (DECam) is a wide-field instrument mounted on
the 4m V. Blanco Telescope (Cerro Tololo Inter-American Observatory).
Its impressive technical characteristics make it one of the most
suitable ground-based telescopes for the production of accurate
stellar photometry, even toward crowded regions such as the Magellanic
Clouds. We analyzed DECam images acquired from 2018 February to 2020
January toward the Small Magellanic Cloud. We performed a point-spread
function photometry by using the SExtractor and PSFEx tools and
producing a comprehensive photometric catalog in the Sloan Digital Sky
Survey system, considering the gri filters. Then, we present COSMIC-S,
a photometric catalog consisting of 10971906 sources, including gri
magnitudes with a mean error <sigma_m≥0.04mag. A total of 2456434
sources have good photometry in all three bands. The catalog appears
virtually complete to m=22, with a limiting magnitude m=25. We derived
the color-magnitude and color-color diagrams in order to prove the
goodness of the catalog.
Description:
We have performed a comprehensive analysis of the SMC region by using
observations acquired by DECam in the gri filters, producing a deep
photometric catalogue which includes 10 971 906 sources.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
cosmics.dat 228 10971906 COSMIC-S photometric catalogue of SMC stars
--------------------------------------------------------------------------------
Byte-by-byte Description of file: cosmics.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- COSMIC-S COSMIC-S source ID (COSMICS-NNNNNNNN)
18- 36 F19.16 deg RAdeg Right ascension (J2000)
38- 55 F18.14 deg DEdeg Declination (J2000)
57- 80 E24.16 deg e_RAdeg Right ascension uncertainty
82-103 E22.16 deg e_DEdeg ? Declination uncertainty
105-122 F18.15 mag gmag ? g-band magnitude (SDSS g)
124-145 F22.20 mag e_gmag ? g-band magnitude uncertainty (SDSS g)
147-164 F18.15 mag rmag ? r-band magnitude (SDSS r)
166-187 F22.20 mag e_rmag ? r-band magnitude uncertainty (SDSS r)
189-206 F18.15 mag imag ? i-band magnitude (SDSS i)
208-228 F21.19 mag e_imag ? i-band magnitude uncertainty (SDSS i)
--------------------------------------------------------------------------------
Acknowledgements:
Antonio Franco, antonio.franco(at)le.infn.it
(End) Patricia Vannier [CDS] 03-Apr-2025