- ID:
- ivo://CDS.VizieR/J/ApJ/686/948
- Title:
- CO in extragalactic giant molecular clouds
- Short Name:
- J/ApJ/686/948
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We use high spatial resolution observations of CO to systematically measure the resolved size-line width, luminosity-line width, luminosity-size, and mass-luminosity relations of GMCs in a variety of extragalactic systems. Although the data are heterogeneous, we analyze them in a consistent manner to remove the biases introduced by limited sensitivity and resolution, thus obtaining reliable sizes, velocity dispersions, and luminosities. We compare the results obtained in dwarf galaxies with those from the Local Group spiral galaxies. We find that extragalactic GMC properties measured across a wide range of environments are very much compatible with those in the Galaxy. The property that shows the largest variability is their resolved brightness temperature, although even that is similar to the average Galactic value in most sources.
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- ID:
- ivo://CDS.VizieR/J/A+A/628/A96
- Title:
- 12CO J=3-2 datacube toward N11
- Short Name:
- J/A+A/628/A96
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- After 30 Doradus, N11 is the second largest and brightest nebula in the Large Magellanic Cloud (LMC). This large nebula has several OB associations with bright nebulae at its surroundings. N11 was previously mapped at the lowest rotational transitions of ^12^CO (J=1-0 and 2-1), and in some particular regions, pointings of the ^13^ CO J=1-0 and 2-1 lines were also performed. Observationsof higher CO rotational transitions are needed to map gas with higher critical densities, which are useful to study the physical conditions of the gas component and its relation with the UV radiation more accurately. Using the Atacama Submillimeter Telescope Experiment, we mapped the whole extension of the N11 nebula in the ^12^CO J=3-2 line and three subregions in the ^13^CO J=3-2 line. The regions mapped in the ^13^CO J=3-2 were selected with the criterion that they were to be exposed to the radiation in different ways: a region lying across the nebula, which is related to the OB association LH10 (N11B), another region that it is associated with the southern part of the nebula, which is related to the OB association LH13 (N11D), and finally an area farther away in the southwest without any embedded OB association (N11I) We found that the morphology of the molecular clouds lying in each region shows some signatures that could be explained by the expansion of the nebulae and the action of the radiation. Fragmentation generated in a molecular shell due to the expansion of the N11 nebula is suggested. The integrated line ratios ^12^CO/^13^CO show evidence of selective photodissociation of the ^13^CO, and probably other mechanisms such as chemical fractionation. The values found for the integrated line ratios ^12^CO J=3-2/1-0 are in agreement with values that were assumed in previous works, and the CO contribution to the continuum at 870um was derived directly. The distribution of the integrated line ratios ^12^CO J=3-2/2-1 show indications of stellar feedback in N11B and N11D. The ratio between the virial and local thermal equilibrium (LTE) mass (M_vir_/M_LTE_) is higher than unity in all analyzed molecular clumps, which suggests that the clumps are not gravitationally bounded and may be supported by external pressure. A non-LTE analysis suggests that we map gas with densities of about a few 10^3^cm^-3^. The molecular clump at N11B, the unique molecular feature with direct evidence of ongoing star formation, is the densest of the clumps we analyzed.
- ID:
- ivo://CDS.VizieR/J/A+A/503/469
- Title:
- Compact clusters in LMC catalogue of stars
- Short Name:
- J/A+A/503/469
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The LMC is an ideal environment for studying stellar MFs, because it contains a large population of compact clusters at different evolutionary stages. We aim to obtain constraints on the initial MFs (IMFs) of our sample clusters on the basis of their present-day MFs, combined with our understanding of their dynamical and photometric evolution. We use Hubble Space Telescope photometry for six rich, compact star clusters in the Large Magellanic Cloud (LMC), with ages ranging from 0.01 to 1.0Gyr, to derive the clusters' stellar mass functions (MFs) at their half-mass radii.
- ID:
- ivo://CDS.VizieR/J/A+AS/126/325
- Title:
- Compact Radio Sources in & behind LMC catalogue
- Short Name:
- J/A+AS/126/325
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of a continuum snapshot survey of a 3x4{deg}^2^ region of the Large Magellanic Cloud including the area of the giant molecular cloud and the 30 Doradus nebula. The observations have been carried out with the Australia Telescope Compact Array (ATCA) at 1.4 and 2.4GHz. Most fields are complete to about 6mJy peak flux density at 1.4GHz and to about 3mJy at 2.4GHz. The positions, peak and integral flux densities of 113 compact (<54") sources detected at 1.4GHz and of 70 sources (<34") detected at 2.4GHz are presented. Positions are accurate to about 3" and peak flux densities are accurate to about 10% or better, depending on the source position relative to the pointing centers. 32 of the sources detected at 1.4GHz are coincident with H{alpha} objects in the catalogue of Davies, Elliot and Meaburn (1976MmRAS..81...89D); these are possibly intrinsic to the LMC. However, we suppose that most are background objects, since the number vs. flux agrees with predictions of extragalactic source counts from other surveys.
- ID:
- ivo://CDS.VizieR/J/MNRAS/373/521
- Title:
- Complete catalog of planetary nebulae in LMC
- Short Name:
- J/MNRAS/373/521
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This paper presents accurate homogeneous positions, velocities and other pertinent properties for 460 newly discovered and 169 previously known planetary nebulae (PNe) in the central 25-deg^2^ bar region of the Large Magellanic Cloud (LMC). Candidate emission sources were discovered using a deep, high-resolution H{alpha} map of the LMC obtained by median stacking a dozen 2h H{alpha} exposures taken with the UK Schmidt Telescope (UKST). Our spectroscopic follow-up of more than 2000 compact (i.e. <20arcsec) H{alpha} emission candidates uncovered has tripled the number of PNe in this area. All of the 169 previously known PNe within this region have also been independently recovered and included in this paper to create a homogeneous data set. Of the newly discovered PNe, we classify 291 as 'true', 54 as 'likely' and 115 as 'possible' based on the strength of photometric and spectroscopic evidence. Radial velocities have been measured using both weighted averaging of emission lines and cross-correlation techniques against high-quality templates.
- ID:
- ivo://CDS.VizieR/J/ApJS/178/56
- Title:
- CO observations of LMC Giant Molecular clouds
- Short Name:
- J/ApJS/178/56
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The second survey of the molecular clouds in the Large Magellanic Cloud in ^12^CO(J=1-0) was carried out by NANTEN. The sensitivity of this survey is twice as high as that of the previous NANTEN survey, leading to a detection of molecular clouds with M_CO_>~2x10^4^solMass. We identified 272 molecular clouds, 230 of which are detected at three or more observed positions. We derived the physical properties, such as size, line width, and virial mass, of the 164 GMCs (Giant Molecular clouds) that have an extent more than the beam size of NANTEN in both the major and minor axes.
- ID:
- ivo://CDS.VizieR/J/ApJS/197/16
- Title:
- CO observations of LMC molecular clouds (MAGMA).
- Short Name:
- J/ApJS/197/16
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the properties of an extensive sample of molecular clouds in the Large Magellanic Cloud (LMC) mapped at 11pc resolution in the CO(1-0) line. Targets were chosen based on a limiting CO flux and peak brightness as measured by the NANTEN survey. The observations were conducted with the ATNF Mopra Telescope as part of the Magellanic Mopra Assessment. We identify clouds as regions of connected CO emission and find that the distributions of cloud sizes, fluxes, and masses are sensitive to the choice of decomposition parameters.
- ID:
- ivo://CDS.VizieR/J/AJ/142/103
- Title:
- Cool evolved stars in SAGE-SMC and SAGE-LMC
- Short Name:
- J/AJ/142/103
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We investigate the infrared (IR) properties of cool, evolved stars in the Small Magellanic Cloud (SMC), including the red giant branch (RGB) stars and the dust-producing red supergiant (RSG) and asymptotic giant branch (AGB) stars using observations from the Spitzer Space Telescope Legacy program entitled "Surveying the Agents of Galaxy Evolution in the Tidally Stripped, Low Metallicity SMC", or SAGE-SMC. The survey includes, for the first time, full spatial coverage of the SMC bar, wing, and tail regions at IR wavelengths (3.6-160um). We identify evolved stars using a combination of near-IR and mid-IR photometry and point out a new feature in the mid-IR color-magnitude diagram that may be due to particularly dusty O-rich AGB stars. We find that the RSG and AGB stars each contribute ~20% of the global SMC flux (extended + point-source) at 3.6um, which emphasizes the importance of both stellar types to the integrated flux of distant metal-poor galaxies.
119. CP stars in LMC
- ID:
- ivo://CDS.VizieR/J/MNRAS/362/1025
- Title:
- CP stars in LMC
- Short Name:
- J/MNRAS/362/1025
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- With the aim to corroborate the result of a search for chemically peculiar stars in the Large Magellanic Cloud (LMC), we present measurements obtained from CCD imaging of two fields, one containing a young open cluster (NGC 1711). ************************************************************************** * * * Sorry, but the author(s) never supplied the tabular material * * announced in the paper * * * **************************************************************************
- ID:
- ivo://CDS.VizieR/J/ApJ/658/345
- Title:
- CRIc photometry of Magellanic Bridge Fields
- Short Name:
- J/ApJ/658/345
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We report on observations of the stellar populations in 12 fields spanning the region between the Magellanic Clouds, made with the Mosaic II camera on the 4m telescope at the Cerro-Tololo Inter-American Observatory. The two main goals of the observations are to characterize the young stellar population (which presumably formed in situ in the Bridge and therefore represents the nearest stellar population formed from tidal debris), and to search for an older stellar component (which would have been stripped from either Cloud as stars, by the same tidal forces that formed the gaseous Bridge). We determine the star formation history of the young inter-Cloud population, which provides a constraint on the timing of the gravitational interaction that formed the Bridge. We do not detect an older stellar population belonging to the Bridge in any of our fields, implying that the material that was stripped from the Clouds to form the Magellanic Bridge was very nearly a pure gas.
