J/ApJ/946/65 AstroSat/UVIT obs. of the SMC: point-source cat. (Devaraj+, 2023)
UVIT observations of the Small Magellanic Cloud: Point-Source Catalog.
Devaraj A., Joseph P., Stalin C.S., Tandon S.N., Ghosh S.K.
<Astrophys. J., 946, 65 (2023)>
=2023ApJ...946...65D 2023ApJ...946...65D
ADC_Keywords: Photometry, ultraviolet; Magellanic Clouds
Keywords: Ultraviolet astronomy ; Ultraviolet telescopes ;
Ultraviolet photometry ; Ultraviolet sources
Abstract:
Three fields in the outskirts of the Small Magellanic Cloud were
observed by the UltraViolet Imaging Telescope (UVIT) on board
AstroSat, between 2017 December 31 and 2018 January 1. The
observations were carried out on a total of seven filters, three in
the far-ultraviolet (FUV; 1300-1800Å) band and four in the
near-ultraviolet (NUV; 2000-3000Å) band. We carried out photometry
of these observations that have a spatial resolution better than 1.5".
We present here the first results of this work, which is a matched
catalog of 11241 sources detected in three FUV and four NUV
wavelengths. We make the catalog available online, which would be of
use to the astronomical community to address a wide variety of
astrophysical problems. We provide an expression to estimate the total
count rate in the full point-spread function of UVIT that also
incorporates the effect of saturation.
Description:
The observations used in this work were taken by the UltraViolet
Imaging Telescope (UVIT) on board AstroSat. UVIT consists of two 38cm
telescopes, one telescope for FUV (1300-1800Å) and the second
telescope for both NUV (2000-3000Å) and VIS (3200-5500Å)
wavelengths. It has a circular field of view of 28' diameter and
provides images with spatial resolution better than 1.5".
Three Small Magellanic Cloud (SMC) fields were observed by UVIT
between 2017 December 31 and 2018 January 1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 150 11241 Corrected catalog of point sources in SMC in
three FUV and four NUV filters --
from erratum published in 2023, ApJ, 959, 66
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See also:
II/236 : UBVR CCD survey of the Magellanic clouds (Massey+, 2002)
J/AJ/113/1011 : UV Observations of the SMC (Cornett+ 1997)
J/MNRAS/466/4540 : SUMaC I (Hagen+, 2017)
J/ApJS/247/47 : UV survey of M31 with UVIT on AstroSat (Leahy+, 2020)
J/MNRAS/513/5847 : RSG stars in binary systems. I. SMC (Patrick+, 2022)
J/AJ/168/22 : UV sources in SMC & M31 field 13 (Ananthamoorthy+, 2024)
Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Seq [1/11241] Sequential identification number
7- 14 F8.5 deg RAdeg [16.4/18.1] Right Ascension (J2000)
16- 24 F9.5 deg DEdeg [-71.7/-71] Declination (J2000)
26- 33 F8.3 mag N263M [13.7/22.3]?=9999 AB magnitude in Astrosat/UVIT
N263M filter (1)
35- 42 F8.3 mag e_N263M [0.003/0.2]?=9999 Error in N263M (1)
44- 51 F8.3 mag N245M [14.2/22.5]?=9999 AB magnitude in Astrosat/UVIT
N245M filter (1)
53- 60 F8.3 mag e_N245M [0.003/0.2]?=9999 Error in N245M (1)
62- 69 F8.3 mag N279N [13/21.7]?=9999 AB magnitude in Astrosat/UVIT
N279N filter (1)
71- 78 F8.3 mag e_N279N [0.004/0.3]?=9999 Error in N279N (1)
80- 87 F8.3 mag F172M [13.8/23.3]?=9999 AB magnitude in Astrosat/UVIT
F172M filter (1)
89- 96 F8.3 mag e_F172M [0.005/0.4]?=9999 Error in F172M (1)
98- 105 F8.3 mag F169M [13.8/23.4]?=9999 AB magnitude in Astrosat/UVIT
F169M filter (1)
107- 114 F8.3 mag e_F169M [0.004/0.4]?=9999 Error in F169M (1)
116- 123 F8.3 mag F154W [13.9/23.5]?=9999 AB magnitude in Astrosat/UVIT
F154W filter (1)
125- 132 F8.3 mag e_F154W [0.004/0.4]?=9999 Error in F154W (1)
134- 141 F8.3 mag N219M [13.7/21.8]?=9999 AB magnitude in Astrosat/UVIT
N219M filter (1)
143- 150 F8.3 mag e_N219M [0.005/0.3]?=9999 Error in N219M (1)
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Note (1): Filter calibration information from Table 2:
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Filter λmean Δλ Zero-point magnitude
Å Å
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F154W 1541 380 17.771 ± 0.01
F169M 1608 290 17.410 ± 0.01
F172M 1717 125 16.274 ± 0.02
N245M 2447 280 18.452 ± 0.01
N263M 2632 275 18.146 ± 0.01
N279N 2792 90 16.416 ± 0.01
N219M 2196 270 16.654 ± 0.02
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See also Tandon+ 2017AJ....154..128T 2017AJ....154..128T and 2020AJ....159..158T 2020AJ....159..158T
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 27-Feb-2025