A search for compact H II regions embedded in dark clouds has been carried out in an effort to study local massive star formation. Approximately 20% of the total area of opaque dark cloud material in the sky with A/sub v/> or =6 mag was surveyed with the NRAO three-element interferometer at ...

Radial velocities of 283 points obtained by Fabry-Perot interferometry of H(alpha) on S 140 and the contiguous dark CO cloud are discussed. The velocities of the dark and emission regions are comparable and yield -22 km/s as an average. The bright rim is redshifted with respect to its surroundings by 2 km/s. UBV photometry discloses a ...

This book presents papers on protostars and planets. Topics covered include molecular clouds and star formation, physical conditions in isolated dark globules, infrared spectroscopy of protostars and young stellar objects, and molecular cloud cores.

Theoretical CO line profiles are calculated for dark molecular clouds in the case where the cloud is resolved. Assuming that the density and velocity structure of the cloud can be approximated by power laws, both crude analytical and detailed numerical calculations indicate that realistic profiles can be produced ...

Various papers on the formation of stars and planets are presented. The general topics addressed include: molecular clouds and star formation, young stellar objects and circumstellar disks, chemistry and grains in molecular clouds and the solar nebula, formation of giant planets, and models of the solar nebula and other planetary systems. Individual papers ...

Methods for determining the percentage of dark matter in the Galaxy are described. The measuring of the speed of hydrogen gas in clouds using the Doppler effect is discussed. Consideration is given to the examination of the envelope of dark matter around the Galaxy from observations of high-velocity stars and the measurement of groups ...

Carbon recombination line emission has been detected at two frequencies from a dark cloud contiguous with the small H ii region Sharpless 140. The observations show the dark cloud to be of unusually low temperature and to have a markedly inhomogeneous density distribution, with localized ...

Carbon recombination line emission has been detected at two frequencies from a dark cloud contiguous with the small H II region Sharpless 140. The observations show the dark cloud to be of unusually low temperature and to have a markedly inhomogeneous density distribution, with localized ...

Surveys of galactic dark clouds at 5.0 and 7.8 GHz have no detections with flux density approximately-greater-than0.2 Jy. A model of continuum emission from H II and C II regions surrounding embedded stars indicates that, in most dark clouds, no young stars earlier than B1 ...

in the constellation Sagitta, just north of Aquila, located at 2000 19:17.9, 2000 +19:12.3 (l = 53.0, b = +3 dark clouds, Sandqvist (1977) cataloged a small cloud, Sa 136, in the southern constellation of Musca. 2.6. L43 L43 is a small filamentary cloud in the constellation Ophiuchus located at about 2000 16

The black areas in this image -- called infrared dark clouds -- are exceptionally cold, dense cloud cores seen in silhouette against the bright diffuse infrared glow ...

Feathery white clouds fill the boundary between the dark and light blue regions on the Great Dark Spot. The spiral shape of both the dark boundary and the ...

Measurements of CH emission at 9 cm toward the bright stars ..cap alpha.. Cam and kappa Cas and from dark clouds near the stars reveal an association between diffuse clouds and dark clouds. Here the term diffuse clouds refers to clouds seen in optical ...

A radio continuum survey of dark clouds )Gilmore (Astron. J. 85, 894 (1980), preceding paper)) revealed only a few new regions of star formation. The observations of these individual regions are presented and discussed in this paper. The regions include S140 IR, S156, and Mon R2, as well as the dark cloud complexes ...

We have used archival Hubble Space Telecope (HST) Halpha images to study the immediate environments of massive and intermediate-mass young stellar object (YSO) candidates in the Large Magellanic Cloud (LMC). The sample of YSO candidates, taken from Gruendl and Chu, was selected based on Spitzer IRAC and MIPS observations of the entire LMC and complementary ground-based optical ...

Dec 26, 2003 ... 2003 December 26. See Explanation. Clicking on the picture will download the highest resolution version available. Young Star, Dark Cloud ...

The newly discovered hot-emission line star, HD 147196 in the Rho Oph dark cloud region was observed

Oct 29, 1999 ... Other, smaller clouds associated with the Great Dark Spot are white, and are also at high altitudes. ... Added February 5, 1996. Rate this: ...

QUESTION: What is the Rho Oph dark cloud and where is it? ANSWER from Dr. Thomas Roellig on May 16: The Rho Ophiucus dark cloud (abbreviated Rho Oph) is an ...

The high latitude dark cloud L1642 in the 21 cm H I region was mapped using a 100 m radio telescope.

According to the standard theory of gravity, the X-ray producing cloud would need an additional source of gravity - a halo of dark matter - to keep the hot ...

May 26, 2002 ... Explanation: The dark nebula predominant at the lower left of the above photograph is known as the Pipe Nebula. The dark clouds ...

Jul 8, 2009 ... Explanation: Connecting the Pipe Nebula to the colorful region near bright star Antares is a dark cloud dubbed the Dark River, flowing from ...

Jun 3, 2008 ... Explanation: Connecting the Pipe Nebula to the bright star Antares is a flowing dark cloud nicknamed the Dark River. The murkiness of the ...

gas infall into clumps within the dark matter potential of the group, and that ..... effects, then we do not require any dark matter in this galaxy. ...

Perfect Dark. ... Perfect Dark December 11, 2006, Full-Res: PIA08833. Streaks of cloud are overlain with graceful ring shadows in this view of Saturn's ...

The authors have used the NRAO 140 foot telescope to observe the 20?3-1E (12.1 GHz) transition of CH3OH towards three dense molecular cloud cores embedded in nearby dark clouds.The line was detected in absorption towards TMC 1 and L 183. The excitation temperature of this line in such regions is thus less than the temperature of the ...

The SPIRIT III infrared telescope on the Midcourse Space Experiment (MSX) satellite has provided an unprecedented view of the mid-infrared emission (8-25 ?m) of the Galactic plane. An initial analysis of images from MSX Galactic plane survey data reveals dark clouds seen in silhouette against the bright emission from the Galactic plane (Egan et al.). These ...

The authors present preliminary results of the optical identifications of 40 X-ray sources detected in a 13.5 ks ROSAT pointing and in the ROSAT all-sky survey in the Cha II star forming region (SFR). The level of X-ray emission of the Cha II members is comparable to that of young stars in the Cha I, Taurus-Auriga and Lupus SFRs, but the members of the ? ...

Emission at 113 GHz from the CN molecule was sought in a large number of interstellar regions, primarily dark dust clouds. Lines were detected in four dark clouds, the first time CN was observed in this type of object. Comparative CO observations were also performed. The CN/CO abundance ratio varies from ...

Aug 24, 2011 ... Explanation: Yes, but how many dark clouds have a multicolored lining? Pictured , behind this darker cloud, is a pileus iridescent cloud, a group ...

We report observations of the J = 1..-->..0 line of HCN measured toward six positions in nearby low-temperature dark clouds. The measured relative intensities of the hyperfine components of the J = 1..-->..0 line are anomalous in that the F = 0..-->..1 transition is stronger than would be expected if all three components (F = 2..-->..1, F = ...

A dark cloud is exposed to the ambient radiation field of integrated starlight in the Galaxy. Scattering of starlight by the dust particles gives rise to a diffuse surface brightness of the dark nebula. The intensity and the spectrum of this diffuse radia...

Jan 22, 2011 ... dc.subject.other, Dark Matter Extragalactic Gas Clouds mappinig, en_US. dc.title , Dark Matter and Extragalactic Gas Clouds in the NGC ...

Results from a survey of 2.6 mm emission in the J = 1 to 0 transition of CO of clouds are reported for 15 high Galactic latitude clouds and three clouds located on the fringe of a large molecular cloud in the Chameleon dark cloud complex. The line widths, excitation ...

Infrared polarimetry has been obtained of 16 objects in the proposed region of star formation in the rho Oph dark cloud. This study is used along with visual polarimetry, infrared photometry, and molecular line studies to deduce the cloud morphology around the very young stellar cluster.

(12)CO observations covering 170 square degrees toward the southern T Association Lupus have revealed the presence of an extended physically related complex of dark clouds which have recently formed low mass stars. The estimated mass of the clouds (about ...

M16 is an evolved, extremely density bounded H II region, which now consists only of a series of ionization fronts at molecular cloud boundaries. The source of ionization is the OB star cluster (NGC 6611) which is about 5 x 10/sup 6/ years old. We used the CFA/UA 102 cm balloon-borne telescope to map this region and detected three far-infrared (far-IR) ...

... Descriptors : *ARTIFICIAL SATELLITES, AIRBORNE, ALBEDO, BLACKBODY RADIATION, CLOUD HEIGHT INDICATORS, CLOUDS, INFRARED ...

This paper is the second in a series dealing with the energetics of molecular clouds. The techniques presented in an earlier paper are here applied to the S140 molecular cloud. This cloud is extremely interesting because it contains a single, strong near-infrared source. The infrared source appears to be very similar to the ...

About one-eighth of a well-sampled 850 deg/sup 2/ region of Orion and Monoceros, extending from the Taurus dark cloud complex to the CMa OB 1 association, shows emission at the frequency of the J = 1 ..-->.. 0 transition of CO coming from either local clouds (d < 1 kpc) lying as much as 25/sup 8/ from the galactic plane or from ...

... Title : An Examination of the Effects of Cloud Seeding in Phase II of the Santa Barbara Convective Band Seeding Test Program. ...

Cosmic Origins Spectrograph Observations of a Dense Translucent Cloud Theodore P. Snow Eric B. Burgh Joshua P. Destree The Cosmic Origins Spectrograph (COS) has greater sensitivity at moderate resolution than any UV spectrograph before 2009. One of the COS programs is to obtain UV spectra of interstellar translucent clouds. In these ...

Allen, M., and G.R. Knapp, 1978: Radio observations of interstellar CN toward diffuse clouds, dark clouds, black clouds, and circumstellar clouds. ...

The Dark Heart of the King. Blobs are intensely glowing clouds of hot hydrogen gas that envelop ... Stars Spring up Out of the Darkness (Artist Concept) ...

Jun 11, 2003 ... The cluster is composed of thousands of galaxies enveloped in a gigantic cloud of hot gas, and an amount of dark matter equivalent to more ...

It could be that the dark matter is not arranged in the same way as the galaxies we are ... Galaxies probably form in the centre of dark matter clouds. ...

New evidence from NASA's Chandra X-ray Observatory challenges an alternative theory of gravity that eliminates the need for dark matter the elusive ...

One of the most notable of these dark absorption nebulae is a cloud toward the constellation Ophiuchus known as Barnard 68, pictured above. That no stars are ...

We present an extinction map of a ~1700 deg sq region that encloses the Ophiuchus, the Lupus, and the Pipe dark complexes using 42 million stars from the Two Micron All Sky Survey (2MASS) point source catalog. The use of a robust and optimal near-infrared method to map dust column density (nicer, described in Lombardi & Alves 2001, A&A, 377, 1023) allow us to detect ...

... II) Cloud Impacts: Simulation and Application (III) Cloud Data Bases, (IV) Measurement Systems and Sensors, (V) Cirrus and Contrail Clouds. ...

... Accession Number : ADA087856. Title : MISERS BLUFF II Cloud Sampling Program, Data Summary and Dust Cloud Characterizations. ...

An investigation of the physical and chemical properties of nine interstellar dark clouds is reported. Observations of a variety of atomic and molecular species have been obtained and the clouds have been partially mapped in the near infrared. The observations have been compared with theoretical models of the line emission and ...

The magnetic field geometry in the outer regions of five dark cloud complexes has been mapped by measuring the linear polarization of stars background to the cloud peripheries. These observations are aimed at establishing a relationship between the field geometry and cloud morphology for cloud ...

The primary goal of this paper is to provide evidence that can prove true or false the hypothesis that dark matter in the Galactic halo can clump into stellar-mass compact objects. If such objects exist, they would act as lenses to external sources in the Magellanic Clouds, giving rise to an observable effect of microlensing. We present the results of our ...

A new photograph and some spectra have been obtained for the group of HH objects HH 52, 53, 54. A long, gaseous streamer extends from HH 54 and produces an appearance very similar to that of HH 12. The spectra provide some additional radial velocities and line-intensity measurements for the group. It is confirmed that HH 54D is a star with no unusual photometric or spectroscopic characteristics. ...

Clouds and Spokes. Several dark spoke-like features can be seen across the broad B ring (left of planet). The moons Rhea and Dione appear as dots below and ...

Feb 25, 2008 ... The Persian Gulf, officially known as The Gulf, features clouds ofblue and green in its dark waters. These clouds likely indicate a ...

Jun 29, 2010 ... This month look for dark interstellar clouds blocking patches of Milky Way stars .

Jun 29, 2010 ... This month look for dark interstellar clouds blocking patches of Milky Way stars .

Aug 2, 2010 ... Cold things (like high clouds) are very bright. Warm things (like Mexico and Florida) are dark. This imagery can be compared to data ...

The J equals 2-1 rotational line of DCO(plus) has been definitely detected in five molecular clouds,

Oct 13, 2005 ... Stars are thought to emerge out of clouds of cold, dark gas floating in space. The idea is that at some point, a cloud begins to collapse ...

We have conducted a deep search for HCCN towards the dark cloud TMC-l and several GMC's via its N(J)

This review synthesizes current observational knowledge concerning pre- main-sequence evolution and the interaction of pre-main-sequence stars with their dark cloud environment. Questions of current interest are raised and the direction of future fruitful research is discussed. (80 references) (BJG)

The Rho Ophiucus dark cloud (abbreviated Rho Oph) is an area that is forming ... Rho Oph is in the constellation Ophiucus (the Snake-Bearer) which is high ...

A near infrared (2.2 micron) polarization survey of about 190 sources was conducted toward nearby dark clouds. The sample includes both background field stars and embedded young stellar objects. The aim is to determine the magnetic field structure in the ...

We performed slitless spectroscopy of small bodies with Subaru Telescope + Suprime-Cam attached grism filters using a dark cloud as a curtain for avoiding contamination from background stars. Spectra of 50 objects with R < 23 mag will be on the poster.

We present photoelectric BVRI photometry for 16 T Tau and related stars in the Rho Oph dark cloud, as well as vidicon spectroscopic observations for nine stars. The color excesses of these stars favor circumstellar dust shells as the source of the observed infrared excesses.

Measurements were performed on 284 stars of the spectral classes B to F, in the region of the dark cloud Coal Sack in order to study the morphological structure and the chemical composition of the interstellar dust. Photometric as well as spectrophotometr...

The MACHO Project is searching for galactic dark matter in the form of massive compact halo objects (Machos). Millions of stars in the Large Magellanic Cloud (LMC), Small Magellanic Cloud (SMC), and Galactic bulge are photometrically monitored in an attem...

Ammonia has been found in four cool, dark clouds, giving further evidence for its general distribution in interstellar matter. Inversion radiation was detected from the (1,1) but not from the (2,2) rotational state, indicating kinetic temperatures less th...

C-12O observations covering 170 square degrees toward the southern T Association Lupus have revealed