J/MNRAS/532/322 U-SMAC I. UV catalog of SMC-Shell region (Hota+, 2024)
UVIT Study of the MAgellanic Clouds (U-SMAC).
I. Recent star formation history and kinematics of the shell region in the
north-eastern Small Magellanic Cloud.
Hota S., Subramaniam A., Dhanush S.R., Cioni M.-R.L., Subramanian S.
<Mon. Not. R. Astron. Soc. 532, 322 (2024)>
=2024MNRAS.532..322H 2024MNRAS.532..322H (SIMBAD/NED BibCode)
ADC_Keywords: Ultraviolet; Galaxies, photometry; Optical; Galaxies, dwarf;
Magellanic Clouds
Keywords: galaxies: kinematics and dynamics; galaxies: interactions
Magellanic Clouds
Abstract:
The interactions between the Magellanic Clouds significantly affect
the shape and distribution of the young stellar population,
particularly in the periphery of the Small Magellanic Cloud (SMC). We
present the first far-UV (FUV) map of the north-east SMC-Shell region
using the Ultra Violet Imaging Telescope (UVIT) onboard AstroSat. The
detected FUV stars are combined with Gaia Early Data Release 3 data to
create a FUV-optical catalogue of ∼14400 stars. FUV-optical
colour-magnitude diagrams are used along with isochrones to estimate
the stellar ages. The detected stars are formed in multiple episodes.
We identified two episodes of star formation (∼60 and ∼260Myr ago),
where the episode at ∼260Myr is linked to the recent interaction
with the Large Magellanic Cloud (LMC) and the episode at ∼60Myr is
linked to the pericentric passage of the SMC around our Galaxy. The
median proper motion (PM) and velocity dispersion are found to be
similar to the SMC main body, indicating that this region has not
experienced significant tidal effects. The FUV stellar surface density
and the dispersion in PM suggest that the extent of the inner SMC in
the north-east direction to be around 2.2°. We detect arm-like and
arc-like structures in the FUV stellar density map, and their
kinematics appear to be similar to the SMC main body. These extended
outer features are the spatial stellar overdensities formed over
multiple episodes of star formation, but without apparent kinematic
distinction.
Description:
The SMC-Shell region was imaged by the UVIT onboard the AstroSat, the
first Indian Space Observatory. The UVIT is a twin telescope, 38cm in
diameter each, with a spatial resolution of 1.4" and a field of view
of 0.5°. One telescope is for the far-UV (FUV: 130-180nm), and the
second one is for the near-UV (NUV: 200-300nm) and the visible
(VIS: 350-550nm) observations. The FUV and NUV channels are used to
obtain the photometric data, and the VIS channel is used for drift
correction due to the spacecraft. In this work, we have obtained FUV
images in the F148W (1481±250Å) filter for eleven fields of the
SMC-Shell region.
11 fields, for a total of 14439 sources, were observed over 4 years,
from July 2018 to March 2021, with exposure times ranging from 1500s
to 2400s.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 76 14440 UV catalogue of the SMC-Shell region
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See also:
II/375 : VISTA Magellanic Survey (VMC) cat. (YJKs) DR6 (Cioni+, 2011)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
I/357 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
J/AJ/113/1011 : UV Observations of the SMC (Cornett+ 1997)
J/AJ/127/1531 : Star formation history of SMC (Harris+, 2004)
J/AJ/140/416 : IR photometry of massive stars in the SMC (Bonanos+, 2010)
J/A+A/517/A50 : Ages & lum. of young SMC/LMC star clusters (Glatt+, 2010)
J/other/Sci/337.444 : RV curves of Galactic massive O stars (Sana+, 2012)
J/ApJS/213/34 : Veloc. of Cygnus OB2 massive binaries (Kobulnicky+, 2014)
J/ApJS/215/15 : SMaSH+: observations and companion detection (Sana+, 2014)
J/MNRAS/449/639 : VMC survey. XIV. SFR in SMC (Rubele+, 2015)
J/A+A/591/A11 : SMC BV photometry of 9 star cluster fields (Dias+, 2016)
J/ApJ/816/49 : Spitzer/IRAC observations of SMC Cepheids (Scowcroft+, 2016)
J/AJ/154/199 : SMASH: Survey of MAgellanic Stellar History (Nidever+, 2017)
J/MNRAS/472/808 : YJKs light curves of SMC Classical Cepheids (Ripepi+, 2017)
J/A+A/616/A187 : SMC clusters age-dating & classification (Nayak+, 2018)
J/A+A/628/A51 : Magellanic Clouds reddening map (Joshi+, 2019)
J/ApJ/887/267 : OB stars embedded in the HI gas of SMC (Murray+, 2019)
J/MNRAS/495/98 : Tidal scars of the Small Magellanic Cloud (De Leo+, 2020)
J/ApJ/904/13 : RVel for 10 giant eclipsing binaries (Graczyk+, 2020)
J/ApJS/247/47 : UV survey of M31 with UVIT on AstroSat (Leahy+, 2020)
J/A+A/649/A7 : MC structure and properties (Gaia Collaboration+, 2021)
J/AJ/161/74 : SMASH DR2. 197 SMASH fields (Nidever+, 2021)
J/MNRAS/502/2859 : The VMC survey XLI - PMs within the SMC (Niederhofer+, 2021)
J/MNRAS/504/2983 : Reddening of SMC red clump stars (Tatton+, 2021)
J/MNRAS/513/5847 : Red supergiants in binary systems. I. SMC (Patrick+, 2022)
J/ApJ/946/65 : AstroSat/UVIT obs. SMC: point-source cat. (Devaraj+, 2023)
J/A+A/672/A65 : Clean SMC stellar samples (Jimenez-Arranz+, 2023)
J/A+A/690/A289 : Binarity at LOw Metallicity (BLOeM). I. (Shenar+, 2024)
J/ApJS/275/34 : UVIT DR1, comprehensive catalog of UVIT obs. (Piridi+, 2024)
http://astrobrowse.issdc.gov.in/astro_archive/archive/Home.jsp : ISRO Science
Data Archive AstroSat Archive
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Seq [0/14439] Running sequence number
7- 25 I19 --- GaiaEDR3 Gaia EDR3 (I/350) source identifier
(Source_id)
27- 44 F18.15 deg RAdeg [13.9/19.8] Right ascension from UVIT (ICRS)
46- 63 F18.14 deg DEdeg [-72/-70.2] Declination from UVIT (ICRS)
65- 70 F6.3 mag FUVmag [13.9/22.6]? FUV (148nm) AB magnitude
72- 76 F5.3 mag e_FUVmag [0.01/0.2] Uncertainty in FUVmag
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History:
From electronic version of the journal
References:
Hota et al. Paper I. 2024MNRAS.532..322H 2024MNRAS.532..322H This catalog
Hota et al. Paper II. 2024AJ....168..255H 2024AJ....168..255H Cat. J/AJ/168/255
(End) Robin Leichtnam [CDS] 01-Sep-2025