ALMA Community Meeting and Surveys for ALMA
List of presentations - as of 18 July 2007 Alphabetically ordered by authors name
The status of the eSMA
The Italian ARC - A brief overview of the status and future development of the Italian ARC-node will be presented.
De Breuck Carlos
A Survey for Water Maser Emission towards Bok Globules
De Gregorio Monsalvo Itziar
We report the most sensitive water maser survey towards Bok globules to date, using NASA's 70 m antenna in Robledo de Chavela (Spain). We observed 207 positions within the catalog with a higher possibility of harboring a young star, uing as selection criteria the presence of radio continuum emission (from submillimeter to centimeter wavelengths), geometrical centers of molecular outflows, peaks in maps of high-density tracers (ammonia or CS), and IRAS point sources. We also present a statistical study of our selection criteria as predictors for the presence of maser emission. These results have been complemented with VLA high-resolution observations using the Very Large Array. We have used the accurate positions of the maser emission to derive information about the powering source of the masers, their relation with molecular outflows, and the kinematical properties of the region.
Molecular gas in the nuclei of radio galaxies: Centaurus A as use case // D. Espada , A. Peck, S. Matsushita et al.
Radio galaxies are giant ellipticals that presents powerful radio jets presumably powered by the accretion of interstellar matter onto supermassive black holes. Some of these galaxies are seen to posses relevant amounts of cold gas with double-horned line profiles suggesting rotating disks, seen in the optical as dust lanes. How much ISM is located in the nuclear regions in the most powerful radio galaxies, what is the relative amount of its different phases (i.e. what are the relative distributions of molecular, atomic and ionized gas), what are the mechanisms that drives the gas from kiloparsec to parsec scales (i.e. spiral features, bar structures, etc.), what are the fueling rates to the super massive black holes and whether the accretion events have an episodic nature are questions necessary to be addressed. Here we present the molecular gas properties in the inner kpc of the closest radio-galaxy, Centaurus A (NGC 5218), as traced by its CO(2--1) line observed using the Submillimeter Array. Due to its proximity (3.4 Mpc), this is the only radio galaxy with current interferometers that can be observed with good high spatial resolution (i.e. < 100 pc). We resolve both the molecular gas in the inner 300 pc of the galaxy, the circumnuclear molecular gas (perpendicular to the jet with a PA = 150 deg, followed by outer molecular gas that is aligned along the optical dust lane and mid-IR distribution at PA = 120 deg. Although the circumnuclear gas is close to a solid-rigid rotating structure, asymmetries in its distribution and kinematics deviates with respect to a simple model of disk or torus. We find that the ratio of the molecular gas content with respect to dust is up to 5 times larger in the circumnuclear gas. Information along the line of sight is also found by using the absorption features seen by molecular gas against the unresolved nuclear radio-continuum.
A first look at the ALMA Science Archive
The ALMA Science Archive (ASA) is the interface through which astronomers access ALMA data. The ASA is a component of the ALMA Archive subsystem which is optimized access to ALMA data in a scientifically meaningful way. This presentation will provide a brief overview of the design of the ASA and a first look at the ASA and its user interface.
Observing Planetary Systems with ALMA
The North American ALMA Science Center (NAASC)
The NAASC is situated at NRAO headquarters in Charlottesville, Virginia, USA. I'll present the plans for ALMA core support for the North American community, and our plans for full science support.
Observing rotation of molecular outflows
Launhardt Ralf et al
One of the fundamental problems in astrophysics is related to the removal of angular momentum during gravitational accretion of matter from large scales onto compact objects. Once an accretion disk has formed, theoretical models propose rotating jets as a mean of removing angular momentum from the system, thus allowing accretion onto the central object (e.g., a young star). Indeed, indications of jet rotation have been observed in a few T Tauri stars using HST/STIS data. As these measurements are extremely difficult, many groups have also searched for rotation signatures in molecular outflows.
I will present new millimeter interferometric data of a nearby protoplanetary disk with a small jet-like molecular outflow. The data reveal clear signatures of outflow rotation. They even allow us to derive the angular momentum flux rate and compare it to the angular momentum distribution in the disk.
When choosing the "right" objects, the sensitivity and uv coverage of ALMA will allow us to do the step from the one current "by chance" discovery to tackling the problem with a dedicated survey.
Ubiquitous uniqueness - the hot core of IRAS 17233
While in the past hot cores were thought of as rare, modern instruments show that they are a widespread phenomenon, given enough sensitivity. They also telescope. Although its luminosity corresponds to aappear in a much larger range of masses than previously believed. That will finally allow us to get enough statistics to determine relevant parameters of the star formation processes. A recent example of a new hot core is IRAS17233, found in a recent survey of massive YSOs at delta <-20 degree carried out with the APEX telescope. Although its luminosity corresponds to a B0.5 star, we detect exceptionally strong and rich molecular emission, signpost of hot core activity. We report observations of the source with the SMA at 1.3~mm. These observations show a bright single object on a scale of 0.04~pc with a mass of 120~M_\\odot (assuming a dust temperature of 50~K). These observations also reveal a well collimated outflow (collimation factor \\sim 4) originating from the source.
ALMA Science Operations
L1641-N: feedback in cluster formation and a large Class 0 protostar disk
We present SMA observations of the cluster L1641-N in Orion A, demonstrating the impact which outflows from even low-mass protostars might have on cluster formation. We also report on the discovery of a large (~200 AU) disk around a very young Class 0 protostar through SMA millimeter interferometry and deep, ground based thermal infrared imaging.
East Asia ALMA Regional Center
Dutch Regional ALMA Center
van der Tak Floris
The search for the first radio galaxies: desperately seeking ALMA
The deepest radio surveys currently reach sensitivities that allow the detection of ultra high redshift powerful radio galaxies, the first "monsters" in the Universe. A number of selection criteria have been developed to try to identify these sources, but the attempts have so far been hampered by observational limitations at all other wavelengths. An ever growing number of "likely candidates" is being assembled, but the determination of their true nature will have to wait for the unique capabilities of ALMA.
Star formation surveys with Herschel
The ESO Public Surveys with VISTA
Abstract: I will present the ESO policies for managing Public Surveys and validating their advanced data products, introduce the VISTA telescope and its wide field instrument, and provide a summary of the planened public surveys.
Sunyaev-Zeldovich galaxy cluster surveys
Deep surveys and galaxy diagnosis with ALMA
Survey capabilities with mm-wave telescopes in Australia - preparing for ALMA observations
An overview of the capabilities of the millimetre-wave telescopes in Australia will be given, together with an outline of some of the science projects they are being used for. Receivers are available for the 3, 7 and 12mm bands, together with broad back-ends (2-8 GHz). Projects requiring on-the-fly mapping may be undertaken with the 22m Mopra Telescope, in multiple molecular lines simultaneously (upto 8), or interferometric imaging with baselines upto 6 km using the 6 22m-dishes of the Australia Telescope Compact Array, are well-served by these facilities. Several molecular line surveys are already underway, for instance mapping GMCs in tens of molecular lines, as well as line surveys in selected sources. The Australian astronomy community is keen to develop collaborative projects which can facilitate the future use of ALMA, to help the study of such sources in detail.
Line Surveys with Herschel
I will present the capacities of Herschel to study the chemical complexity of the interstellar and cimcurstellar media through unbiased molecular line surveys of prominent molecular clouds and evolved stars. The complementarity with ground based, present and future, facilities will be discussed. The molecular complexity will be addressed in the context of multiwavelength observations covering from the mm domain up to the near, mid and far-infrared.
Exploring the southern sky with AzTEC on board ASTE --- observing Galaxy Clusters and submillimeter galaxies
ASTE (Atacama Submillimeter Telescope Experiment) is a 10-m submillimeter telescope operating in Atacama desert of northern Chile. ASTE has been operating since 2002 and carried out extensive spectroscopic observations with its SIS receiver at 345 GHz. Now, Since April 2007, we started to install AzTEC in to our ASTE telescope. AzTEC is a 144 element semi-conductor bolometer array at 270 GHz developed by University of Massachusetts and collaborators. AzTEC combined with the high precision 10-m ASTE telescope will enable us to map the southern sky with high sensitivity. This instrument will be a very powerful tool to develop important sciences which will lead to those with ALMA. Observing the Sunyaev-Zelâ€™dovich effect (SZE) through clusters of galaxies, or an extensive survey of submillimeter galaxies (SMGs) are key examples for extragalactic field. SZE observations will reveal several new features of galaxy clusters; to resolve the structures of very hot ICM gas well above 10 keV together with X-ray images. Deep observations of selected field will provide us with indispensable clues on the nature of high-z SMGs. The current progress of the project and the key sciences will be discussed in the presentation.
NANTEN and NANTEN2 updated: CO view of the Local Group Galaxies
NANTEN2 telescope has obtained the first results at 500-800GHz in 2006. I will summarize the major results on the high mass star forming regions, the LMC/SMC, and the Galactic center, along with the relevant new results from ASTE.
The Methanol MultiBeam Survey: High Mass Star Formation Across the Galaxy Gary Fuller (Manchester), James Caswell (ATNF) & the MMB collaboration
Class II methanol masers are uniquely associated with deeply embedded, young high-mass stars. To produce a Galaxy-wide unbiased survey of such objects, the Methanol MultiBeam (MMB) Survey is using a new 7 beam receiver to survey the Galactic plane, |b|<=2 deg, for 6.7GHz Class II methanol maser sources. Currently we are completing the survey of the southern part of the plane using the Parkes radio telescope. Newly identified sources are being concurrently observed with ATCA and, for the more northern sources, MERLIN, to determine their positions to arcsecond or better accuracy. The survey is sufficiently sensitivity to detect sources at the outer edge of the far side of the Galaxy. Currently the survey has identified over 600 sources, about half of which were previously unknown. In this presentation I will discuss the current status of the MMB survey and the opportunity that ALMA provides for follow-up surveys to probe the nature and environment of these forming massive stars.
First Results of the JCMT Gould Belt Legacy Survey
The James Clerk Maxwell Telescope is in the process of gaining two instruments ideally suited for surveys: the 345-GHz heterodyne receiver array HARP-B and the 850&450 micron camera SCUBA-2. A number of so-called Legacy Surveys have been planned to optimally make use of these instruments. I will present the first results obtained during HARP-B Science Verification of the Gould Belt Legacy Survey. This survey envisages to image almost all well-known regions of low- and intermediate-mass star formation within 0.5 kpc from the Sun with SCUBA-2, and map in CO and isotopes ten cloud regions and a thousand small cores. I will present an image of CO emission of the core of the Serpens region, and discuss the structure and kinematics of the molecular gas. I will conclude with a prospect of ALMA observations to follow up this survey.
Synergy between ALMA and Spitzer for Star Formation Studies
Extra galactic surveys with APEX
Synergies between JWST and ALMA
I will first summarize the JWST mission and its observing capabilities. I will then review the research fields which will benefit from a synergic approach of JWST and ALMA. Finally, I will discuss joint JWST-ALMA observing programs that would maximize the scientific return of the two facilities.
Spectral line surveys in Galaxies
Martin Pintado Jesus
Hi-GAL, the Herschel infrared Galactic Plane Survey: bridging the gap between the solar neighbourhood and galaxies.
Dust is the main contributor to the overall energy budget of galaxies, and a most important and effective tracer of the global structural, physical and evolutionary conditions of the ISM material throughout the whole life-cycle of a galaxy. From diffuse interstellar cirrus to dense molecular clouds, from protostars to post-AGB envelopes, from supershells to supernovae remnants, the equatorial plane of our Galaxy provides the ideal laboratory to carry out investigations of the global and integrated properties of the different phases of the Galactic ISM, their evolution and interactions.The Herschel satellite offers the optimum and unique combination of spectral coverage, unprecedented spatial resolution and sensitivity to efficiently map the bulk of dust emission in all ISM phases over the entire Galactic Plane. In combination with complementary and already available surveys both in the continuum at adiacent wavelengths, and in atomic and molecular gas tracers, it will be possible to uniquely address fundamental and as yet unanswered questions.
What's the contribution of cold material to the overall mass budget of the Galaxy?
What's the ISM temperature and the intensity of the Interstellar Radiation field throughout the Galaxy?
What's the star formation efficiency as a function of Galactocentric radius and environmental conditions?
What's the relationship between the local properties of star formation and the global integrated scaling laws derived for external galaxies
What's the timeline for the formation of massive stars? What are the variations in the gas-to-dust ratio, and what factors govern these variations
A 60-600um 5 band, 4-40\" diffraction limited beam FWHM, photometric imaging survey with Herschel of 720 square degrees along the entire Galactic Plane, will be a very ambitious Herschel Open Time Key-Project with a promise of breakthroughs in many fields of Galactic astronomy and profound implications for Extra-galactic studies. It will also provide the community with a publicly available, homogeneous and calibrated dataset of extraordinary legacy value for decades to come. Hi-GAL will be the unique opportunity to survey the Galactic Plane at unprecedented resolutions in a ground-blocked wavelength range in the 20-30 years horizon, and will be the unique pathfinder for ALMA.
Wide field bolometer surveys with CCAT
Either (1) Wide-field spectral line imaging surveys at mm/submm wavelengths or 2) Surveys of the Galaxy with the JCMT
The millimeter and radio surveys in the COSMOS field
The panchromatic Cosmic Evolution Survey (COSMOS) is optimized for the study of the evolution of galaxies and supermassive black holes in the context of large scale structure out to redshifts of about 3. The existing and ongoing surveys in the radio (VLA) and millimeter (MAMBO,AzTEC,BOLOCAM) regime alone will likely provide an interesting database of sources for future ALMA observations. I will give an overview of the COSMOS survey focusing on the longest wavelengths. The COSMOS field was specifically chosen to be accessible by both ALMA and (E)VLA.
Galactic surveys with APEX
I will present the current plans and first results of ATLASGAL, an unbiased survey of the inner Galactic disk with LABOCA that has just started. I will also mention other Galactic surveys planned with APEX.
HOPS: An H2O southern galactic Plane Survey.
I will present preliminary results from, and the design of, HOPS. HOPS is a survey of at least 90 square degrees of the southern Galactic Plane at 12mm, using the single dish Mopra radiotelescope. Recent upgrades to Mopra include a new spectrometer (MOPS) which has an instantaneous 8GHz bandwidth. We intend to simlulteneously survey for water masers, ammonia, methanol, cyanoacetylene as well as radio recombination lines. Such a survey will be essential to the studies of high mass star formation in the ALMA era. In particular the earliest stages, where ammonia is an excellent temperature and density probe of both cold and warm gas.
Studying Sources in the Epoch of Reionization with ALMA