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We present [CII] observations of 20 strongly lensed dusty star forming galaxies at 2.1 < z < 5.7 using APEX and Herschel. The sources were selected on their 1.4 mm flux (S_1.4mm > 20 mJy) from the South Pole Telescope survey, with…

We present K-band polarimetric images of several massive young stellar objects at resolutions $\sim$ 0.1-0.5 arcsec. The polarization vectors around these sources are nearly centro-symmetric, indicating they are dominating the illumination…

天体物理学 · 物理学 2009-11-13 Zhibo Jiang , Motohide Tamura , Melvin G. Hoare , Yongqiang Yao , Miki Ishii , Min Fang , Ji Yang

We present IRAC/MIPS Spitzer Space Telescope observations of the solar type and the low mass stellar population of the young (~5 Myr) Lambda Orionis cluster. Combining optical and 2MASS photometry, we identify 436 stars as probable members…

太阳与恒星天体物理 · 物理学 2015-05-19 Jesus Hernandez , Maria Morales-Calderon , Nuria Calvet , L. Hartmann , J. Muzerolle , R. Gutermuth , K. L. Luhman , J. Stauffer

General results from a 3-5 micron spectroscopic survey of nearby low-mass young stellar objects are presented. L and M-band spectra have been obtained of \~50 low mass embedded young stars using the ISAAC spectrometer mounted on UT1-Antu at…

天体物理学 · 物理学 2007-05-23 K. M. Pontoppidan , H. Fraser , F. L. Schoeier , E. Dartois , W. -F. Thi , E. F. van Dishoeck

Astronomers have yet to establish whether high-mass protostars form from high-mass prestellar cores, similar to their lower-mass counterparts, or from lower-mass fragments at the heart of a pre-protostellar cluster undergoing large-scale…

星系天体物理 · 物理学 2022-01-12 R. L. Pitts , L. E. Kristensen , J. K. Jørgensen , S. J. van der Walt

We performed a survey in the SiO $J=5\rightarrow4$ line toward a sample of 199 Galactic massive star-forming regions at different evolutionary stages with the SMT 10 m and CSO 10.4 m telescopes. The sample consists of 44 infrared dark…

星系天体物理 · 物理学 2019-06-19 Shanghuo Li , Junzhi Wang , Min Fang , Qizhou Zhang , Fei Li , Zhi-Yu Zhang , Juan Li , Qingfeng Zhu , Shaoshan Zeng

We present high resolution (R = 18,000), high signal-to-noise, 2 micron spectra of 52 infrared-selected Class I and flat-spectrum young stellar objects in the Taurus-Auriga, $\rho$ Ophiuchi, Serpens, Perseus, and Corona Australis dark…

天体物理学 · 物理学 2009-09-29 G. W. Doppmann , T. P. Greene , K. R. Covey , C. J. Lada

The Galactic Center contains some of the most extreme conditions for star formation in our Galaxy as well as many other phenomena that are unique to this region. Given our relative proximity to the Galactic Center, we are able to study…

The Submillimeter Array has opened a new window to study the innermost warm and dense regions of the envelopes and disks around deeply embedded protostars. This paper presents high-angular resolution (< 2'') submillimeter observations of…

天体物理学 · 物理学 2009-11-13 J. K. Jorgensen , T. L. Bourke , P. C. Myers , F. L. Schoeier , E. F. van Dishoeck , D. J. Wilner

We are conducting a survey of several regions of high-mass star formation to assess their content and structure. The observations include Spitzer observations, ground-based optical and near-IR imaging surveys, and optical and IR spectra of…

天体物理学 · 物理学 2011-03-10 L. E. Allen , J. L. Hora , S. T. Megeath , L. K. Deutsch , G. G. Fazio , L. Chavarria , R. W. Dell

The rarity and deeply embedded nature of stars with masses larger than 8 solar masses has limited our understanding of their formation. Previous work has shown that complementing spectral energy distributions with interferometric and…

太阳与恒星天体物理 · 物理学 2021-04-14 A. J. Frost , R. D. Oudmaijer , W. J. de Wit , S. L. Lumsden

We survey 44 young stellar objects located near the edges of mid-IR-identified bubbles in CS (1-0) using the Green Bank Telescope. We detect emission in 18 sources, indicating young protostars that are good candidates for being triggered by…

星系天体物理 · 物理学 2016-02-17 C. Watson , Kathryn Devine , N. Quintanar , T. Candelaria

The James Clerk Maxwell Telescope has been used to obtain submillimeter and millimeter continuum photometry of a sample of 30 IRAS sources previously studied in molecular lines and centimeter radio continuum. All the sources have IRAS…

天体物理学 · 物理学 2007-05-23 Sergio Molinari , Jan Brand , Riccardo Cesaroni , Francesco Palla

We present Early Science observations with the Large Millimeter Telescope, AzTEC 1.1 mm continuum images and wide bandwidth spectra (73-111 GHz) acquired with the Redshift Search Receiver, towards four bright lensed submillimetre galaxies…

We present a catalog of low-mass dense cores observed with the SHARC-II instrument at 350 microns. Our observations have an effective angular resolution of 10", approximately 2.5 times higher than observations at the same wavelength…

Context - Circumstellar discs are ubiquitous around young stars, but rapidly dissipate their gas and dust on timescales of a few Myr. The Herschel space observatory allows for the study of the warm disc atmosphere, using far-infrared…

We present the initial results of our investigation of the star-forming complex W49, one of the youngest and most luminous massive star forming regions in our Galaxy. We used Spitzer/Infrared Array Camera (IRAC) data to investigate massive…

太阳与恒星天体物理 · 物理学 2015-12-17 Gozde Saral , Joseph L. Hora , Sarah E. Willis , Xavier P. Koenig , Robert A. Gutermuth , A. Talat Saygac

We demonstrate the unique capabilities of Herschel to study very young luminous extragalactic young stellar objects (YSOs) by analyzing a central strip of the Large Magellanic Cloud obtained through the HERITAGE Science Demonstration…

Star-forming molecular clouds are characterised by the ubiquity of intertwined filaments. The filaments have been observed in both high- and low-mass star-forming regions, and are thought to split into collections of sonic fibres. The…