New infrared star clusters in the Northern and Equatorial Milky Way with 2MASS

Bica, E.; Dutra, Carlos Maximiliano; Soares, Jules Batista; Barbuy, B.

doi:10.1051/0004-6361:20030486

Cited by 202 publications

(238 citation statements)

References 40 publications

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“…However, it is likely that we uncovered the most populous objects. In the recent compilation of stellar clusters, updated to August 2011 of all Galactic star cluster catalogs (e.g., Dias et al 2002;Mercer el at 2005;Dutra et al 2003;Bica et al 2003;Borissova et al 2011), Morales et al (2013) counted 2247 clusters visible in the optical and 1950 and 197 cluster candidates found in the near-and mid-infrared, respectively. Since then, Solin et al (2012Solin et al ( , 2014, Majaess (2013), and Zasowski et al (2013) reported 137; 88; 229 and 20 new embedded cluster candidates in the UKIDSS GPS, VVV, WISE, and Spitzer GLIMPSE-360 areas.…”

Section: Cluster Search and Methods Of Analysismentioning

confidence: 99%

New galactic star clusters discovered in the VVV survey. Candidates projected on the inner disk and bulge

Borissova

Chené

Alegría

et al. 2014

A&A

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Context. VISTA Variables in the Vía Láctea (VVV) is one of six ESO Public Surveys using the 4 meter Visible and Infrared Survey Telescope for Astronomy (VISTA). The VVV survey covers the Milky Way bulge and an adjacent section of the disk, and one of the principal objectives is to search for new star clusters within previously unreachable obscured parts of the Galaxy. Aims. The primary motivation behind this work is to discover and analyze obscured star clusters in the direction of the inner Galactic disk and bulge. Methods. Regions of the inner disk and bulge covered by the VVV survey were visually inspected using composite JHK S color images to select new cluster candidates on the basis of apparent overdensities. DR1, DR2, CASU, and point spread function photometry of 10 × 10 arcmin fields centered on each candidate cluster were used to construct color-magnitude and color-color diagrams. Follow-up spectroscopy of the brightest members of several cluster candidates was obtained in order to clarify their nature. Results. We report the discovery of 58 new infrared cluster candidates. Fundamental parameters such as age, distance, and metallicity were determined for 20 of the most populous clusters.

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Section: Cluster Search and Methods Of Analysismentioning

confidence: 99%

New galactic star clusters discovered in the VVV survey. Candidates projected on the inner disk and bulge

Borissova

Chené

Alegría

et al. 2014

A&A

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“…Around 1300 clusters, mainly in the infrared have been discovered through automatic or semi-automatic searches of large scale survey data products from DSS, 2MASS, DENIS and GLIMPSE (e.g. Bica et al 2003;Mercer et al 2005;Froebrich et al 2007a;Glushkova et al 2010). Expectations are that the new generation of all sky surveys (UKIDSS, the VISTA-based VHS and VVV, and Gaia) will add many more.…”

Section: Introductionmentioning

confidence: 99%

New Galactic star clusters discovered in the VVV survey

Borissova

Bonatto

Kurtev

et al. 2011

A&A

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109

170

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Context. VISTA Variables in the Vía Láctea (VVV) is one of the six ESO Public Surveys operating on the new 4-m Visible and Infrared Survey Telescope for Astronomy (VISTA). VVV is scanning the Milky Way bulge and an adjacent section of the disk, where star formation activity is high. One of the principal goals of the VVV Survey is to find new star clusters of different ages. Aims. In order to trace the early epochs of star cluster formation we concentrated our search in the directions to those of known star formation regions, masers, radio, and infrared sources. Methods. The disk area covered by VVV was visually inspected using the pipeline processed and calibrated K S -band tile images for stellar overdensities. Subsequently, we examined the composite JHK S and Z JK S color images of each candidate. PSF photometry of 15 × 15 arcmin fields centered on the candidates was then performed on the Cambridge Astronomy Survey Unit reduced images. After statistical field-star decontamination, color-magnitude and color-color diagrams were constructed and analyzed. Results. We report the discovery of 96 new infrared open clusters and stellar groups. Most of the new cluster candidates are faint and compact (with small angular sizes), highly reddened, and younger than 5 Myr. For relatively well populated cluster candidates we derived their fundamental parameters such as reddening, distance, and age by fitting the solar-metallicity Padova isochrones to the color-magnitude diagrams.

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“…New, deep, infrared surveys (2 MASS, DENIS, GLIMPSE, ongoing VISTA-VVV Survey, Minniti et al 2010) provide great promise in reducing the selection effects which plagued decades of optical surveys in the Milky Way. Following the release of these surveys, a cottage industry has blossomed in the identification of new, candidate Milky Way star clusters (Dutra & Bica 2000;Dutra et al 2003;Bica et al 2003;Mercer et al 2005;Froebrich et al 2007). A&A 516, A35 (2010) Several years ago we embarked on a long-term project to observe candidate star clusters in the inner Milky Way and to study them in much greater detail (Borissova et al 2003(Borissova et al , 2006Ivanov et al 2002Ivanov et al , 2005Kurtev et al 2007Kurtev et al , 2008Kurtev et al , 2009Hanson et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Obscured clusters

Hanson¹,

Kurtev²,

Borissova³

et al. 2010

A&A

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Context. New infrared surveys have revealed over 1000 new open cluster candidates in the Milky Way, but these candidates need to be confirmed with follow up observations. Of particular interest are young, massive star clusters because they serve as nearby analogues to the distant super star clusters studied as point sources in other galaxies. Aims. We determine the physical parameters and investigate the high-mass stellar content of the infrared star cluster Mercer 23, situated near the Galactic plane (l = 53.• 772, b = +0.• 164). Methods. Our analysis is based on new Baade/PANIC JHK S and ISAAC/VLT imaging of Mercer 23 and ISAAC/VLT moderate resolution (R ≈ 4000) spectroscopy of the brightest cluster members in the H-and K-bands. The cluster age is determined from isochrone main-sequence (MS) and pre-MS fitting. We derive stellar parameters for eight of the stellar members, using a full non-LTE modeling of the obtained spectra. Results. Mercer 23 is a very young cluster, with age of t = 2-4 Myr. The cluster suffers reddening of E(J−K S ) = 1.35, A V = 7.2 mag. The derived distance is d = 6.5 ± 0.3 kpc. Our spectral modeling allows us to conclude that the three most luminous member are evolved highly massive stars: a WR star, and two mid-O supergiant stars, based on their derived luminosity. Conclusions. Mercer 23 is not a super-massive cluster such as those recently recognized to exist in the Milky Way. However, its mass estimate of 4-6 × 10 3 M and possibly more, puts it in the class of young Galactic clusters hosting WR stars.

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New infrared star clusters in the Northern and Equatorial Milky Way with 2MASS

Cited by 202 publications

References 40 publications

New galactic star clusters discovered in the VVV survey. Candidates projected on the inner disk and bulge

New galactic star clusters discovered in the VVV survey. Candidates projected on the inner disk and bulge

New Galactic star clusters discovered in the VVV survey

Obscured clusters

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