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In this paper we undertake a study of the 21 square degree SMOG field, a Spitzer cryogenic mission Legacy program to map a region of the outer Milky Way towards the Perseus and Outer spiral arms with the IRAC and MIPS instruments. We…

Astrophysics of Galaxies · Physics 2019-08-14 Elaine Winston , Joseph Hora , Robert Gutermuth , Volker Tolls

Protoclusters represent sites of accelerated galaxy formation and extreme astrophysical activity characteristic of dense environments. Identifying massive protoclusters and mapping their spatial structures are therefore crucial first steps…

We present the results of our investigation of the star-forming complexes W51 and W43, two of the brightest in the first Galactic quadrant. In order to determine the young stellar object (YSO) populations in W51 and W43 we used…

Astrophysics of Galaxies · Physics 2017-05-03 G. Saral , J. L. Hora , M. Audard , X. P. Koenig , J. R. Martínez-Galarza , F. Motte , Q. Nguyen-Luong , A. T. Saygac , H. A. Smith

Context: The ESO Public Survey "VISTA Variables in the V\'ia L\'actea" (VVV) provides deep multi-epoch infrared observations for an unprecedented 562 sq. degrees of the Galactic bulge, and adjacent regions of the disk. In this survey nearly…

Dusty debris disks around pre- and main-sequence stars are potential signposts for the existence of planetesimals and exoplanets. Giant planet formation is therefore expected to play a key role in the evolution of the disk. This is…

[Abridged] To effectively investigate galaxy formation and evolution, it is of paramount importance to exploit homogeneous data for large samples of galaxies in different environments. The WINGS (WIde-field Nearby Galaxy-cluster Survey)…

We present CARMA 30 GHz Sunyaev-Zel'dovich (SZ) observations of five high-redshift ($z \gtrsim 1$), infrared-selected galaxy clusters discovered as part of the all-sky Massive and Distant Clusters of WISE Survey (MaDCoWS). The SZ decrements…

A two-band (B and V) wide-field imaging survey of a complete, all-sky X-ray selected sample of 78 clusters in the redshift range z=0.04-0.07 is presented. The aim of this survey is to provide the astronomical community with a complete set…

We identify 47,600 clusters of galaxies from photometric data of Two Micron All Sky Survey (2MASS), Wide-field Infrared Survey Explorer (WISE), and SuperCOSMOS, among which 26,125 clusters are recognized for the first time and mostly in the…

Astrophysics of Galaxies · Physics 2018-01-31 Z. L. Wen , J. L. Han , F. Yang

We have developed a method for detecting clusters in large imaging surveys, based on the detection of structures in galaxy density maps made in slices of photometric redshifts. This method was first applied to the Canada France Hawaii…

Research on young stellar populations is essential to understand the properties of embedded clusters and advance theories of their formation. This has driven advancements in methodologies for star detection, leading to the development of…

Solar and Stellar Astrophysics · Physics 2025-11-18 E. Nikoghosyan , D. Baghdasaryan , D. Andreasyan , N. Azatyan , A. Samsonyan , A. Yeghikyan

Protoclusters are high-$z$ overdense regions that will evolve into clusters of galaxies by $z=0$, making them ideal for studying galaxy evolution expected to be accelerated by environmental effects. However, it has been challenging to…

We present Gemini/GMOS-S multi-object spectroscopy of 31 galaxy cluster candidates at redshifts between 0.2 and 1.0 and centered on QSO sight-lines taken from Lopez et al. (2008). The targets were selected based on the presence of a…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-16 H. Andrews , L. F. Barrientos , S. Lopez , P. Lira , N. Padilla , D. G. Gilbank , I. Lacerna , M. J. Maureira , E. Ellingson , M. D. Gladders , H. K. C. Yee

We present an all-sky sample of 984 candidate intermediate-mass Galactic star-forming regions color-selected from the Infrared Astronomical Satellite (IRAS) Point Source Catalog and morphologically classify each object using mid-infrared…

Astrophysics of Galaxies · Physics 2015-06-18 Michael J. Lundquist , Henry A. Kobulnicky , Michael J. Alexander , Charles R. Kerton , Kim Arvidsson

(abridged) Star formation in the outer Galaxy, i.e., outside of the Solar circle, has been lightly studied in part due to low CO brightness of molecular clouds linked with the negative metallicity gradient. Recent infrared surveys provide…

High-redshift quasars are important tracers of structure and evolution in the early universe. However, they are very rare and difficult to find when using color selection because of contamination from late-type dwarfs. High-redshift quasar…

We present 737 candidate Young Stellar Objects (YSOs) near the W51 Giant Molecular Cloud (GMC) over an area of 1.25 deg x 1.00 deg selected from Spitzer Space Telescope data. We use spectral energy distribution (SED) fits to identify YSOs…

Astrophysics of Galaxies · Physics 2014-11-20 Miju Kang , John H. Bieging , Matthew S. Povich , Youngung Lee

We report the discovery of 652 star clusters, stellar groups and candidates in the Milky Way with WISE. Most of the objects are projected close to Galactic Plane and are embedded clusters. The present sample complements a similar study…

Astrophysics of Galaxies · Physics 2015-12-03 Denilso Camargo , Eduardo Bica , Charles Bonatto

Context: Debris discs orbiting young stars are key to understand dust evolution and the planetary formation process. We take advantage of a recent membership analysis of the 30 Myr nearby open cluster IC 4665 based on the Gaia and DANCe…

Solar and Stellar Astrophysics · Physics 2020-09-30 Núria Miret-Roig , Nuria Huélamo , Hervé Bouy

The census of obscured quasar populations is incomplete, and remains a major unsolved problem, especially at higher redshifts, where we expect a greater density of galaxy formation and quasar activity. We present Gemini GNIRS near-infrared…

Astrophysics of Galaxies · Physics 2023-04-12 Yuzo Ishikawa , Ben Wang , Nadia L. Zakamska , Gordon T. Richards , Joseph F. Hennawi , Angelica B. Rivera
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