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Context. Both the stellar activity and the accretion processes of young stellar objects can induce variations in their radial velocity (RV). This variation is often modulated on the stellar rotation period and may hide a RV signal from a…

Solar and Stellar Astrophysics · Physics 2024-06-26 Kim Pouilly , Jérôme Bouvier , Evelyne Alecian

We present the results from a systematic search for galactic-scale, molecular (OH 119 $\mu$m) outflows in a sample of 52 Local Volume ($d < 50$ Mpc) Burst Alert Telescope detected active galactic nuclei (BAT AGN) with \emph{Herschel}-PACS.…

Astrophysics of Galaxies · Physics 2016-08-03 M. Stone , S. Veilleux , M. Melendez , E. Sturm , J. Gracia-Carpio , E. Gonzalez-Alfonso

Young stars accrete mass and angular momentum from their circumstellar disks. Some of them also drive outflows, which can be distinguished in optical forbidden emission lines (FELs). We analyze a sample of binary T Tauri stars observed with…

Solar and Stellar Astrophysics · Physics 2020-07-01 Anastasiia V Uvarova , Hans Moritz Günther , David A. Principe , P. Christian Schneider

We present 0".97 $\times$ 0".53 (470 pc $\times$ 250 pc) resolution CO ($J$ = 2-1) observations toward the nearby luminous merging galaxy NGC 6240 with the Atacama Large Millimeter/submillimeter Array. We confirmed a strong CO concentration…

Astrophysics of Galaxies · Physics 2018-02-14 T. Saito , D. Iono , J. Ueda , D. Espada , K. Sliwa , K. Nakanishi , N. Lu , C. K. Xu , T. Michiyama , H. Kaneko , T. Yamashita , M. Ando , M. S. Yun , K. Motohara , R. Kawabe

We report molecular gas observations of IRAS 20100-4156 and IRAS 03158+4227, two local ultraluminous infrared galaxies (ULIRGs) hosting some of the fastest and most massive molecular outflows known. Using ALMA and PdBI observations, we…

With the recent recognition of a second, distinctive class of molecular outflows, namely the explosive ones not directly connected to the accretion-ejection process in the star formation, a juxtaposition of the morphological and kinematic…

Solar and Stellar Astrophysics · Physics 2017-02-22 Luis A. Zapata , Johannes Schmid-Burgk , Luis F. Rodriguez , Aina Palau , Laurent Loinard

We performed the first spectral-line survey at 82--106 GHz and 335--355 GHz toward the outflow-shocked region, OMC 2-FIR 4, the outflow driving source, FIR 3, and the northern outflow lobe, FIR 3N. We detected 120 lines of 20 molecular…

We present the first fully sampled map of 12CO (1-0) emission from M82 covering the entire galaxy. Our map contains a 12 x 15 kpc^2 area. We find that extraplanar CO emission, previously reported at short distances above the galactic plane,…

Astrophysics · Physics 2009-11-07 Christopher L. Taylor , Fabian Walter , Min S. Yun

We report high angular-resolution (~1") CO J=3--2 interferometric mapping, using the Submillimeter Array (SMA), of IRAS22036+5306 (I22036), a bipolar pre-planetary nebula (PPN) with knotty jets discovered in our HST SNAPshot survey of young…

Astrophysics · Physics 2008-11-26 R. Sahai , K. Young , N. A. Patel , C. S'anchez Contreras , M. Morris

Accretion shocks have been recognized as important X-ray emission mechanism for pre-main sequence stars. Yet the X-ray properties of FUor outbursts, events that are caused by violent accretion, have been given little attention. We have…

Solar and Stellar Astrophysics · Physics 2015-05-13 B. Stelzer , S. Hubrig , S. Orlando , G. Micela , Z. Mikulasek , M. Schoeller

We characterize the physical properties of star-formation driven outflows in a sample of 29 local dwarf galaxies drawn from the Dwarf Galaxy Survey. We make use of Herschel/PACS archival data to search for atomic outflow signatures in the…

We study molecular outflows in a sample of 25 nearby (z< 0.17, d<750 Mpc) ULIRG systems (38 individual nuclei) as part of the "Physics of ULIRGs with MUSE and ALMA" (PUMA) survey, using ~400 pc (0.1-1.0" beam FWHM) resolution ALMA CO(2-1)…

We present the first spatially and spectrally resolved image of the molecular outflow in the western nucleus of Arp\,220. The outflow, seen in HCN~(1--0) by ALMA, is compact and collimated, with extension $\lesssim$ 120\,pc. Bipolar…

In order to study how outflows from protostars influence the physical and chemical conditions of the parent molecular cloud, we have observed Barnard 1 (B1) main core, which harbors four Class 0 and three Class I sources, in the CO (J=1-0),…

Astrophysics of Galaxies · Physics 2010-03-10 Masaaki Hiramatsu , Naomi Hirano , Shigehisa Takakuwa

The formation mechanism of brown dwarfs (BDs) is one of the long-standing problems in star formation because the typical Jeans mass in molecular clouds is too large to form these substellar objects. To answer this question, it is crucial to…

Astrophysics of Galaxies · Physics 2016-07-27 Tien-Hao Hsieh , Shih-Ping Lai , Arnaud Belloche , Friedrich Wyrowski

The red MSX source G034.5964-01.0292 (MSXG34), catalogued as a massive YSO, was observed in molecular lines with the aim of discover and study molecular outflows. We mapped a region of 3'x3' centered at MSXG34 using the Atacama…

Astrophysics of Galaxies · Physics 2014-09-05 S. Paron , M. E. Ortega , A. Petriella , M. Rubio

We present the detection of a secondary outflow associated with a Class I source, Ser-emb 15, in the Serpens Molecular Cloud. We reveal two pairs of molecular outflows consisting of three lobes, namely primary and secondary outflows, using…

Previous studies of young stellar objects (YSOs) have uncovered a number of associated parsec-scale optical outflows, the majority of which are driven by low-mass, embedded Class I sources. Here we examine more evolved Classical T Tauri…

Astrophysics · Physics 2009-11-10 F. McGroarty , T. P. Ray

We present new optical and near-infrared spectra of WD0137-349; a close white dwarf - brown dwarf non-interacting binary system with a period of $\approx$114 minutes. We have confirmed the presence of H$\alpha$ emission and discovered He,…

Solar and Stellar Astrophysics · Physics 2017-08-09 E. S. Longstaff , S. L. Casewell , G. A. Wynn , P. F. L. Maxted , Ch. Helling

We identify 45 protostellar outflows in CO maps of the Orion A giant molecular cloud from the CARMA-NRO Orion survey. Our sample includes 11 newly detected outflows. We measure the mass and energetics of the outflows, including material at…