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Start Over Subject magellanic clouds Validation Level 2
511. SMC NGC 346-11 and AV 304 spectra
ID:
ivo://CDS.VizieR/J/A+A/436/687
Title:
SMC NGC 346-11 and AV 304 spectra
Short Name:
J/A+A/436/687
Date:
21 Oct 2021
Publisher:
CDS
Description:
An analysis of high-resolution VLT/UVES spectra of two B-type main sequence stars, NGC 346-11 and AV 304, in the Small Magellanic Cloud (SMC), has been undertaken, using the non-LTE TLUSTY model atmospheres to derive the stellar parameters and chemical compositions of each star. The chemical compositions of the two stars are in reasonable agreement. Moreover, our stellar analysis agrees well with earlier analyses of HII regions. The results derived here should be representative of the current base-line chemical composition of the SMC interstellar medium as derived from B-type stars.
512. SMC observations at 13, 20 and 36cm
ID:
ivo://CDS.VizieR/J/other/Ser/183.103
Title:
SMC observations at 13, 20 and 36cm
Short Name:
J/other/Ser/183.
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present a new catalogue of radio-continuum sources in the field of the Small Magellanic Cloud (SMC). This catalogue contains sources previously not found in 2370MHz (&#955;=13cm) with sources found at 1400MHz (&#955;=20cm) and 843MHz (&#955;=36cm). 45 sources have been detected at 13cm, with 1560 sources at 20cm created from new high sensitivity and resolution radio-continuum images of the SMC at 20cm from paper I (Wong et al., <A HREF="http://simbad.cds.unistra.fr/simbad/sim-ref?bibcode=2011SerAJ.182...43W%202011SerAJ.182...43W">2011SerAJ.182...43W 2011SerAJ.182...43W</A>). We also created a 36cm catalogue to which we listed 1689 radio-continuum sources.
513. S^4^MC project: 6 star forming regions PAHs
ID:
ivo://CDS.VizieR/J/ApJ/744/20
Title:
S^4^MC project: 6 star forming regions PAHs
Short Name:
J/ApJ/744/20
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present results of mid-infrared spectroscopic mapping observations of six star-forming regions in the Small Magellanic Cloud (SMC) from the Spitzer Spectroscopic Survey of the SMC (S^4^MC). We detect the mid-IR emission from polycyclic aromatic hydrocarbons (PAHs) in all of the mapped regions, greatly increasing the range of environments where PAHs have been spectroscopically detected in the SMC. We investigate the variations of the mid-IR bands in each region and compare our results to studies of the PAH bands in the SINGS sample and in a sample of low-metallicity starburst galaxies. PAH emission in the SMC is characterized by low ratios of the 6-9um features relative to the 11.3um feature and weak 8.6 and 17.0um features. Interpreting these band ratios in the light of laboratory and theoretical studies, we find that PAHs in the SMC tend to be smaller and less ionized than those in higher metallicity galaxies.
514. SMC RR Lyrae Fourier decomposition
ID:
ivo://CDS.VizieR/J/MNRAS/426/2063
Title:
SMC RR Lyrae Fourier decomposition
Short Name:
J/MNRAS/426/2063
Date:
21 Oct 2021
Publisher:
CDS
Description:
We have performed the Fourier decomposition analysis of 8- and 13-yr V-band light curves of a carefully selected sample of 454 fundamental-mode RR Lyrae variables (RRab type), detected in an ~=14 square degree area of the Small Magellanic Cloud (SMC) and listed in the Optical Gravitational Lensing Experiment, phase III, Catalogue of Variable Stars. The Fourier decomposition parameters were used to derive metal abundances and distance moduli, following the methodology described by Kapakos, Hatzidimitriou & Soszynski, Paper I (2011, Cat. J/MNRAS/415/1366).
515. SMC RR Lyrae stars light curve analysis
ID:
ivo://CDS.VizieR/J/MNRAS/402/691
Title:
SMC RR Lyrae stars light curve analysis
Short Name:
J/MNRAS/402/691
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present a careful and detailed light curve analysis of RR Lyrae stars in the Small Magellanic Cloud (SMC) discovered by the Optical Gravitational Lensing Experiment (OGLE) project. Out of 536 single-mode RR Lyrae stars selected from the data base, we have investigated the physical properties of 335 'normal-looking' RRab stars and 17 RRc stars that have good quality photometric light curves. We have also been able to estimate the distance modulus of the cloud which is in good agreement with those determined from other independent methods.
516. SMC XMM-Newton images
ID:
ivo://CDS.VizieR/J/A+A/545/A128
Title:
SMC XMM-Newton images
Short Name:
J/A+A/545/A128
Date:
21 Oct 2021
Publisher:
CDS
Description:
Although numerous archival XMM-Newton observations existed towards the Small Magellanic Cloud (SMC) before 2009, only a fraction of the whole galaxy had been covered. Between May 2009 and March 2010, we carried out an XMM-Newton survey of the SMC, to ensure a complete coverage of both its bar and wing. Thirty-three observations of 30 different fields with a total exposure of about one Ms filled the previously missing parts. We systematically processed all available SMC data from the European Photon Imaging Camera. After rejecting observations with very high background, we included 53 archival and the 33 survey observations. We produced images in five different energy bands. We applied astrometric boresight corrections using secure identifications of X-ray sources and combined all the images to produce a mosaic covering the main body of the SMC. We present an overview of the XMM-Newton observations, describe their analysis, and summarise our first results, which will be presented in detail in follow-up papers. Here, we mainly focus on extended X-ray sources, such as supernova remnants (SNRs) and clusters of galaxies, that are seen in our X-ray images. Our XMM-Newton survey represents the deepest complete survey of the SMC in the 0.15-12.0keV X-ray band. We propose three new SNRs that have low surface brightnesses of a few 10^-14^erg/s/cm^2^/arcmin^2^ and large extents. In addition, several known remnants appear larger than previously measured at either X-rays or other wavelengths extending the size distribution of SMC SNRs to larger values.
517. SMC X-ray sources ROSAT PSPC catalogue
ID:
ivo://CDS.VizieR/J/A+AS/142/41
Title:
SMC X-ray sources ROSAT PSPC catalogue
Short Name:
J/A+AS/142/41
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present a catalogue of 517 discrete X-ray sources in a 6{deg}x6{deg} field covering the Small Magellanic Cloud (SMC). The catalogue was derived from the pointed ROSAT PSPC observations performed between October 1991 and May 1994 and is complementary to the Large Magellanic Cloud (LMC) catalogue published by Haberl & Pietsch (1999, Cat. <J/A+AS/139/277>). We followed the same identification scheme and used, among other information, X-ray hardness ratios and spatial extent to classify unknown sources as candidates for active galactic nuclei (AGN), foreground stars, supernova remnants (SNRs), supersoft sources (SSSs) and X-ray binaries. For 158 sources a likely source type is given, from which 46 sources are suggested as background AGN (including candidates resulting from a comparison of X-ray and radio images). Nearly all of the X-ray binaries known in the SMC were detected in ROSAT PSPC observations; most of them with luminosities below 10^36^erg/s suggesting that the fraction of high luminosity X-ray binary systems in the Magellanic Clouds (MCs) is not significantly larger than in our galaxy. Seventeen X-ray sources are associated with SNRs found in earlier work and we suggest here two additional extended sources as SNR candidates. Three very soft sources are newly classified as SSSs from which one is identified with the symbiotic star LIN 358 in the SMC.
518. S3MC: YSOs in N66, in SMC
ID:
ivo://CDS.VizieR/J/ApJ/669/327
Title:
S3MC: YSOs in N66, in SMC
Short Name:
J/ApJ/669/327
Date:
21 Oct 2021
Publisher:
CDS
Description:
We use Spitzer Space Telescope observations from the Spitzer Survey of the Small Magellanic Cloud (S^3^MC) to study the young stellar content of N66, the largest and brightest HII region in the SMC. In addition to large numbers of normal stars, we detect a significant population of bright, red infrared sources that we identify as likely to be young stellar objects (YSOs). We use spectral energy distribution (SED) fits to classify objects as ordinary (main-sequence or red giant) stars, asymptotic giant branch stars, background galaxies, and YSOs.
519. SN 1987A 3mm image
ID:
ivo://CDS.VizieR/J/A+A/541/L2
Title:
SN 1987A 3mm image
Short Name:
J/A+A/541/L2
Date:
21 Oct 2021
Publisher:
CDS
Description:
The proximity of core-collapse supernova 1987A (SN 1987A) in the Large Magellanic Cloud (LMC) and its rapid evolution make it a unique case study of the development of a young supernova remnant. We aim at resolving the remnant of SN 1987A for the first time in the 3-mm band (at 94GHz).
520. SNR IKT 16 X-ray image
ID:
ivo://CDS.VizieR/J/A+A/584/A41
Title:
SNR IKT 16 X-ray image
Short Name:
J/A+A/584/A41
Date:
21 Oct 2021
Publisher:
CDS
Description:
IKT 16 is an X-ray and radio-faint supernova remnant (SNR) in the Small Magellanic Cloud (SMC). A detailed X-ray study of this SNR with XMM-Newton confirmed the presence of a hard X-ray source near its centre, indicating the detection of the first composite SNR in the SMC. With a dedicated Chandra observation we aim to resolve the point source and confirm its nature. We also acquire new ATCA observations of the source at 2.1GHz with improved flux density estimates and resolution. We perform detailed spatial and spectral analysis of the source. With the highest resolution X-ray and radio image of the centre of the SNR available today, we resolve the source and confirm its pulsar wind nebula (PWN) nature. Further, we constrain the geometrical parameters of the PWN and perform spectral analysis for the point source and the PWN separately. We also test for the radial variations of the PWN spectrum and its possible east west asymmetry. The X-ray source at the centre of IKT 16 can be resolved into a symmetrical elongated feature centring a point source, the putative pulsar. Spatial modelling indicates an extent of 5.2" of the feature with its axis inclined at 82{deg} east from north, aligned with a larger radio feature consisting of two lobes almost symmetrical about the X-ray source. The picture is consistent with a PWN which has not yet collided with the reverse shock. The point source is about three times brighter than the PWN and has a hard spectrum of spectral index 1.1 compared to a value 2.2 for the PWN. This points to the presence of a pulsar dominated by non-thermal emission. The expected dE/dt is ~10^37^erg/s and spin period <100ms. However, the presence of a compact nebula unresolved by Chandra at the distance of the SMC cannot completely be ruled out.