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51. LMC extended catalog
ID:
ivo://CDS.VizieR/J/AJ/117/238
Title:
LMC extended catalog
Short Name:
J/AJ/117/238
Date:
21 Oct 2021
Publisher:
CDS
Description:
A survey of extended objects in the Large Magellanic Cloud was carried out on the ESO/SERC R and J Sky Survey Atlases, checking entries in previous catalogs and searching for new objects. The census provided 6659 objects including star clusters, emission-free associations, and objects related to emission nebulae. Each of these classes contains three subclasses with intermediate properties, which are used to infer total populations. The survey includes cross identifications among catalogs, and we present 3246 new objects. We provide accurate positions, classification, and homogeneous measurements of sizes and position angles, as well as information on cluster pairs and hierarchical relation for superimposed objects. This unification and enlargement of catalogs is important for future searches of fainter and smaller new objects. We discuss the angular and size distributions of the objects of the different classes. The angular distributions show two off-centered systems with different inclinations, suggesting that the LMC disk is warped. The present catalog together with its previous counterpart for the SMC and the inter-Cloud region provide a total population of 7847 extended objects in the Magellanic System. The angular distribution of the ensemble reveals important clues on the interaction between the LMC and SMC.
52. LMC & SMC PNe optical spectroscopy. I
ID:
ivo://CDS.VizieR/J/ApJS/75/407
Title:
LMC & SMC PNe optical spectroscopy. I
Short Name:
J/ApJS/75/407
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present optical spectroscopy in the range 3300-7400A for a total of 30 planetary nebulae in the LMC and 11 in the SMC, with measurements of line intensities down to ~1% of H{beta}. Agreement with other authors is on the whole excellent, especially for lines >+10%-20% of H{beta}. Reddening estimates from Balmer line ratios have been determined, and the line intensities dereddened accordingly. Nebular [O III] electron temperature and, where measurable, [N II] temperatures and [S II] densities are given. [O II] electron densities are recalculated using appropriate electron temperatures. A number of spectra exhibit interesting spectral features (including symbiotic-type profiles, unidentified emission lines, and nonsimple Balmer decrements). These objects are discussed in some detail. Zanstra temperatures are derived for a total of 25 objects possessing detectable stellar continua. These temperatures are in agreement with the few published values from various methods, and preliminary photoionization modeling of this sample. The homogeneity and size of the sample make it possible to investigate several interesting correlations between measured parameters.
53. LMC & SMC PNe optical spectroscopy. II
ID:
ivo://CDS.VizieR/J/ApJS/76/1085
Title:
LMC & SMC PNe optical spectroscopy. II
Short Name:
J/ApJS/76/1085
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present optical spectroscopy in the range 3300-7400A for a total of 37 planetary nebulae in the LMC and seven in the SMC. Together with the object from the first paper in the series (1991ApJS...75..407M), we now have accurate emission-line intensities down to a few percent of H{beta} for 77 nebulae in the Magellanic Clouds. Agreement with other authors is excellent. Reddening estimates from Balmer line ratios have been determined, and the line intensities have been dereddened accordingly. Nebular [O III] electron temperature and, where measurable, [S II] densities, are derived. [O II] electron densities are recalculated using appropriate electron temperatures. The [S II] and [O II] electron densities correlate well, with n_e_([O II])>n_e_([S II]). Zanstra temperatures are in derived for 22 objects possessing detectable stellar continua. These temperatures are in agreement with photoionization modeling of this sample.
54. LMC & SMC PNe optical spectroscopy. III
ID:
ivo://CDS.VizieR/J/ApJS/83/87
Title:
LMC & SMC PNe optical spectroscopy. III
Short Name:
J/ApJS/83/87
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present optical spectroscopy in the range 3300-7400A for a total of 52 planetary nebulae in the Large Magellanic Cloud (LMC) and 18 in the Small Magellanic Cloud (SMC). Together with the object from the first (1991ApJS...75..407M) and second (1991ApJS...76.1085M) papers, we now have accurate emission-line intensities for a total of 147 nebulae in the Magellanic Clouds. This sample contains a large selection of objects of low luminosity, with measurements of line intensities down to ~10% of H{beta}. Brighter objects have line intensities measured down to ~2% of H{beta}. Agreement with other authors is generally very good, especially for lines greater than approximately 10% of H{beta}. Reddening estimates from Balmer line ratios have been determined: unreddened and reddened line intensities are tabulated.
55. Lynds' Catalogue of Bright Nebulae
ID:
ivo://CDS.VizieR/VII/9
Title:
Lynds' Catalogue of Bright Nebulae
Short Name:
VII/9
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Catalogue of Bright Nebulae lists the galactic and equatorial coordinates of the center of the cloud, the dimensions of the nebulae as measured on the photograph on which it appeared at its brightest, the area of nebulosity in square degrees, color as compared between the blue and red Palomar plates, a brightness index on a scale of 6, an identification number that indicates the complexity of the nebulosity, and a cross reference to NGC (Cat. <VII.1>), Index Catalogue (IC), Sharpless (1959) Catalogue of HII Regions (Cat. <VII/20>), Cederblad (1956) Catalogue of Diffuse Galactic Nebulae, and Dorschner and Gurtler (1963).
56. Lynds' Catalogue of Dark Nebulae (LDN)
ID:
ivo://CDS.VizieR/VII/7A
Title:
Lynds' Catalogue of Dark Nebulae (LDN)
Short Name:
VII/7A
Date:
21 Oct 2021
Publisher:
CDS
Description:
This catalog is an updated version from the published version. The catalog was based on the red and blue prints of the National Geographic - Palomar Observatory Sky Atlas. The catalog contains positions, both equatorial and galactic for the centers of dark nebulae. Values for the cloud sizes are given in square degrees, and estimates of their opacity are given. The updated catalog is ordered by galactic longitude and includes cross references to the published catalog and Barnard Object numbers associated with the clouds.
57. MAMMOTH-1 450 and 850um images
ID:
ivo://CDS.VizieR/J/A+A/620/A202
Title:
MAMMOTH-1 450 and 850um images
Short Name:
J/A+A/620/A202
Date:
21 Oct 2021
Publisher:
CDS
Description:
In the hierarchical model of structure formation, giant elliptical galaxies form through merging processes within the highest density peaks known as protoclusters. While high-redshift radio galaxies usually pinpoint the location of these environments, we have recently discovered at z~2-3 three enormous (>200kpc) Lyman-alpha nebulae (ELANe) that host multiple active galactic nuclei (AGN) and that are surrounded by overdensities of Lyman- emitters (LAE). These regions are prime candidates for massive protoclusters in the early stages of assembly. To characterize the star-forming activity within these rare structures - both on ELAN and protocluster scales - we have initiated an observational campaign with the James Clerk Maxwell Telescope (JCMT) and the Atacama Pathfinder EXperiment (APEX) telescopes. In this paper we report on sensitive SCUBA-2/JCMT 850 and 450um observations of a 128 arcmin^2^ field comprising the ELAN MAMMOTH-1, together with the peak of the hosting BOSS1441 LAE overdensity at z=2.32. These observations unveil 4.0+/-1.3 times higher source counts at 850um with respect to blank fields, likely confirming the presence of an overdensity also in obscured tracers. We find a strong detection at 850um associated with the continuum source embedded within the ELAN MAMMOTH-1, which - together with the available data from the literature - allow us to constrain the spectral energy distribution of this source to be of an ultra-luminous infrared galaxy (ULIRG) with a far-infrared luminosity of L^SF^_FIR_=2.4^+7.4^+_-2.1_x10^12^L_{sun}_, and hosting an obscured AGN. Such a source is thus able to power a hard photoionization plus outflow scenario to explain the extended Lyman-, HeII1640; and CIV1549 emission, and their kinematics. In addition, the two brightest detections at 850um (f_850_>18mJy) sit at the density peak of the LAEs; overdensity, likely pinpointing the core of the protocluster. Future multiwavelength and spectroscopic datasets targeting the full extent of the BOSS1441 overdensity have the potential to firmly characterize a cosmic nursery of giant elliptical galaxies, and ultimately of a massive cluster.
58. Merged catalogue of reflection nebulae
ID:
ivo://CDS.VizieR/J/A+A/399/141
Title:
Merged catalogue of reflection nebulae
Short Name:
J/A+A/399/141
Date:
21 Oct 2021
Publisher:
CDS
Description:
Several catalogues of reflection nebulae are merged to create a uniform catalogue of 913 objects. It contains revised coordinates, cross-identifications of nebulae and stars, as well as identifications with IRAS point sources.
59. MIPS 24um nebulae
ID:
ivo://CDS.VizieR/J/MNRAS/405/1047
Title:
MIPS 24um nebulae
Short Name:
J/MNRAS/405/1047
Date:
21 Oct 2021
Publisher:
CDS
Description:
Massive evolved stars lose a large fraction of their mass via copious stellar wind or instant outbursts. During certain evolutionary phases, they can be identified by the presence of their circumstellar nebulae. In this paper, we present the results of a search for compact nebulae (reminiscent of circumstellar nebulae around evolved massive stars) using archival 24um data obtained with the Multiband Imaging Photometer for Spitzer. We have discovered 115 nebulae, most of which bear a striking resemblance to the circumstellar nebulae associated with luminous blue variables (LBVs) and late WN-type (WNL) Wolf-Rayet (WR) stars in the Milky Way and the Large Magellanic Cloud (LMC).
60. M17-SW datacubes in C and CO lines
ID:
ivo://CDS.VizieR/J/A+A/575/A9
Title:
M17-SW datacubes in C and CO lines
Short Name:
J/A+A/575/A9
Date:
21 Oct 2021
Publisher:
CDS
Description:
We probe the column densities and masses traced by the ionized [CII] and neutral [CI] atomic carbon with spectrally resolved maps, and compare them to the diffuse and dense molecular gas traced by [CI] and low-J CO lines toward the star-forming region M17 SW. We mapped a 4.1pcx4.7pc region in the [CI] 609{mu}m line using the APEX telescope, as well as the CO isotopologues with the IRAM 30m telescope. Data are analyzed based on velocity channel maps that are 1km/s wide. We correlate their spatial distribution with that of the [CII] map obtained with SOFIA/GREAT. Optically thin approximations were used to estimate the column densities of [CI] and [CII] in each velocity channel.