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We investigate the star formation occurring in a region well below the Galactic plane towards the optical reflection nebula ESO 368-8 (IRAS 07383-3325). We confirm the presence of a small young stellar cluster (or aggregate of tens of YSOs)…

Astrophysics of Galaxies · Physics 2015-05-14 Pedro M. Palmeirim , Joao L. Yun

The first polarimetric images of the OMC-3 region of the Orion A filamentary molecular cloud are presented. Using the JCMT, we have detected polarized thermal emission at 850 microns from dust along a 6' length of the dense filament. The…

Astrophysics · Physics 2009-10-31 Brenda C. Matthews , Christine D. Wilson

The Orion Bar is the archetypal edge-on molecular cloud surface illuminated by strong ultraviolet radiation from nearby massive stars. Owing to the close distance to Orion (about 1,350 light-year), the effects of stellar feedback on the…

Astrophysics of Galaxies · Physics 2016-08-23 Javier R. Goicoechea , J. Pety , S. Cuadrado , J. Cernicharo , E. Chapillon , A. Fuente , M. Gerin , C. Joblin , N. Marcelino , P. Pilleri

Young HII regions are an important site to study O star formation based on distributions of ionized and molecular gas. We revealed that two molecular clouds at $\sim 48$ km s$^{-1}$ and $\sim 53$ km s$^{-1}$ are associated with the HII…

We present a multi-wavelength study to analyse the star formation process associated with the mid-infrared bubble CN 148 (H II region G10.3-0.1), which harbors an O5V-O6V star. The arc-shaped distribution of molecular CO(2-1) emission, the…

Astrophysics of Galaxies · Physics 2015-06-23 L. K. Dewangan , D. K. Ojha , J. M. C. Grave , K. K. Mallick

Kinematic studies of young stars and star clusters have increased our understanding of the process of star formation and evolution in the Milky Way. FU Orionis objects are a specific class of young stellar object notable for their extremely…

Astrophysics of Galaxies · Physics 2025-10-01 Tamojeet Roychowdhury , Lynne A. Hillenbrand

IC 417 is in the Galactic Plane, and likely part of the Aur OB2 association; it is ~2 kpc away. Stock 8 is one of the densest cluster constituents; off of it to the East, there is a 'Nebulous Stream' (NS) that is dramatic in the infrared…

We analyzed the NANTEN2 13CO (J=2-1 and 1-0) datasets in NGC 2024. We found that the cloud consists of two velocity components, whereas the cloud shows mostly single-peaked CO profiles. The two components are physically connected to the HII…

We review the use of young low mass stars and protostars, or young stellar objects (YSOs), as tracers of star formation. Observations of molecular clouds at visible, infrared, radio and X-ray wavelengths can identify and characterize the…

Astrophysics of Galaxies · Physics 2022-05-04 S. T. Megeath , R. A. Gutermuth , M. A. Kounkel

We investigate the young stellar population in and near the cometary globule Ori,I-2. The analysis is based on deep Nordic Optical Telescope R-band and H-alpha images, JCMT SCUBA 450 and 850 micron images combined with near-infrared 2MASS…

Astrophysics of Galaxies · Physics 2014-11-20 B. Mookerjea , G. Sandell

Extensive surveys of star-forming regions with Spitzer have revealed populations of disk-bearing young stellar objects. These have provided crucial constraints, such as the timescale of dispersal of protoplanetary disks, obtained by…

Solar and Stellar Astrophysics · Physics 2018-07-04 C. F. Manara , T. Prusti , F. Comeron , R. Mor , J. M. Alcala , T. Antoja , S. Facchini , D. Fedele , A. Frasca , T. Jerabkova , G. Rosotti , L. Spezzi , L. Spina

L1642 is one of the two high galactic latitude (|b| > 30deg) clouds confirmed to have active star formation. We examine the properties of this cloud, especially the large-scale structure, dust properties, and compact sources in different…

Using infrared photometric data extracted from the 2MASS, IRAS and MSX databases, 142 suspected young stellar objects (YSOs) are selected from about 2 million stars in the Camelopardalis segment of the Milky Way limited by Galactic…

Astrophysics · Physics 2009-06-25 V. Straizys , V. Laugalys

The presence of three more Herbig Ae/Be (HAeBe) stars in the Cepheus Flare within a 1.5$^{\circ}$ radius centered on HD 200775 suggests that star formation is prevalent in a wider region of the LDN 1147/1158, LDN 1172/1174, and LDN 1177…

Solar and Stellar Astrophysics · Physics 2021-09-29 Piyali Saha , Maheswar G. , Blesson Mathew , U. S. Kamath

The young stellar source HH 30 is a textbook example of an ionic optical jet originating from a disk in an edge-on system shown by the HST. It has a remnant envelope in $^{12}$CO observed by ALMA. The optical jet is characterized by its…

Solar and Stellar Astrophysics · Physics 2024-02-06 Tsung-Han Ai , Chun-Fan Liu , Hsien Shang , Doug Johnstone , Ruben Krasnopolsky

We map the three-dimensional structure and large-scale kinematics of the young stellar populations in the G352 giant molecular cloud (GMC) complex. In radio and infrared images, G352 appears as long filament extending ~$3^{\circ}$ (~150 pc)…

We present the results of a photographic and CCD imaging survey for Herbig-Haro (HH) objects in the L1630 and L1641 giant molecular clouds in Orion. The new HH flows were initially identified from a deep H-alpha film from the recently…

Astrophysics · Physics 2009-10-31 S. L. Mader , W. J. Zealey , Q. A. Parker , M. R. W. Masheder

We present spatial and kinematic correlation between the young stellar population and the cloud clumps in the Ophiuchus star-forming region. The stellar sample consists of known young objects at various evolutionary stages, taken from the…

Solar and Stellar Astrophysics · Physics 2022-05-02 Aashish Gupta , Wen-Ping Chen

We characterize the physical conditions and energy budget of the M16 H II region using SOFIA FEEDBACK observations of the [C II] 158 $\mu$m line. The O stars in the $\sim 10^{4}~{\rm M}_{\odot}$ NGC 6611 cluster powering this H II region…

Kinematic information is crucial for understanding the evolution of complex systems, such as interstellar gas. Obtaining full 3D kinematic information is a crucial final step for modeling and interpretation. Molecular clouds are nurseries…

Astrophysics of Galaxies · Physics 2025-09-24 Ji-Xuan Zhou , Guang-Xing Li , Bing-Qiu Chen