I-GALFA Reveals Dynamic Events in Our Galaxy . S. J. Gibson, J.-h. Kang, B.-C. Koo, June 2009 . ... The white stripe marks the Galactic equator ( b=0 ). ... I-GALFA three-color H I image for FVW40.0+0.5, integrated over v lsr = -100 to -90 km/s ( red ), -90 to -80 km/s ( green ), and -80 to -70 km/s ( blue ). ... I-GALFA data reveal a complex tracery of loops, filaments, and blobs hundreds of parsecs above and below the Galactic plane, with isolated compact clouds extending even higher. ...

... This paper describes the main algorithms used by the Einstein Level One processing to create the exposure masks and the background maps for Einstein IPC images, and how these algorithms were recreated in the IRAF environment. Our goal was to recreate the algorithms used by the Level One Processing to create exposure masks and background maps for Einstein Image Proportional Counter (IPC) data (cf. sections 2.5 and 2.7 of Harnden et al. ...

You can also see this page in Russian with using KOI8 (X Windows) or CP1251 (MS Windows) Cyrillic coding. The Laboratory supports the space TV experiments, mainly in the planetary exploration missions. ... Image Co-registration . ... PHOBOS mission - Martian satellites investigations. Phobos on the Martian limb, the image from Phobos-2 probe from 02/28/89. ... Russian Space Bulletin. ... Last modified at June,26 1997 Alexey Kuzmin: akuzmin@mx.iki.rssi.ru . Back to IKI home page ...

Structure Formation : Bright side of the Universe Anatoly Klypin New Mexico State University Also: Stefan Gottloeber (Astrophysikalisches Institut Potsdam) Gustavo Yepes (UAM, Madrid) Cosmological ... -body+hydro simulations Codes: SPH + TREE AMR + shock capturing hydro Physical processes: Compton cooling/heating on CMB Radiative gas cooling Star formation with simple approximations Metal enrichment Energy/momentum feedback from young stars and SN Galaxies too concentrated. ...

... Stellar Evolution is driven entirely by the never ending battle between Pressure and Gravity . As imbalances are reached, the star is driven to find a new Energy source. ... Pressure and gravitational forces are equal, the star is stable and its core is sufficiently hot to fuse Hydrogen into Helium More about main sequence stars . ... The luminosity generated by the core fusion of Helium into Carbon is far greater than the shell luminosity associated with the fusion of Hydrogen into Helium. ...

... We can help students grasp the significance of Hubble's extremely keen eye, and learn a bit about angles and math in the process, with the following in-class activity. ... Looking through binoculars or telescopes allows us to magnify a small section of the sky. To measure sizes or distances in that small section, astronomers divide a degree into 60 smaller pieces called arcminutes, and further subdivide minutes into 60 smaller sections called arcseconds. ... 30 feet = . ... 36 seconds . ...

... Surface Brightness of Background Light . Home . ... Data . ... WFPC2 Home . ... Instrument Home . WFPC2 History . ... LRF Data . ... Data Analysis Home . ... Instrument Handbook . Data Handbook . ... Input the surface brightness in magnitudes per square arcsecond. ... Galaxy U-B and B-V colors are drawn from Longo and deVaucouleurs 1983 for representative objects;V-R and R-I are estimated from WFPC2 Handbook Table 6.1. ... AB_xxxxx are AB magnitudes at the standard WFPC2 filter bands. ...

... Neutral hydrogen observations of the spiral galaxies NGC 6221 and NGC 6215 with the Australia Telescope Compact Array (ATCA) reveal a wide, two-stranded bridge of at least 3 x 10^8 Msun which can be traced between the two galaxies over a projected distance of 100 kpc. ... The color figure below shows the HI emission (blue) in the bridge velocity range overlaid onto an optical image. ... A tidal HI bridge is visible between NGC 6221 and its brightest neighbour, NGC 6215 (v_sys = 1555 km/s). ...

... Since planets are expected to form out of the material in disks around young stars, the formation of a planet will thoroughly alter the structure of the circumstellar disk of their host star, forming significant gaps in the radial distribution of matter around the star. Additionally, processing of solids (annealing/crystallization) and changes in the overall gas/dust ratio are thought to happen during the planet formation process and are believed to alter the observational signature of the disk. ...

Astronomy Picture of the Day . Bright Points on the Quiet Sun . ... Explanation: Up close, the solar surface is a striking patch work of granules in this very high resolution picture of the quiet Sun . ... Constantly present on the solar surface, the bright points do not seem to be related to sunspots that come and go with the magnetic solar cycle . ... Publications with keywords: Sun - magnetic field - granules . Publications with words: Sun - magnetic field - granules . ... A Solar Ballet . ...

... Imaging of the core of the OMC-1 region using NICMOS camera 2 through the F212N and F215N filters shows a wide variety of interesting structure on scales of 0.2" at a very high dynamic range (Stolovy et al. ... The application of image restoration techniques, including multi-channel variants of the Richardson-Lucy technique, offers the chance to enhance structure on the finest scales and also to suppress the prominent and richly structured point-spread functions of the many bright stars in the...

Appendix C Radiative Transfer for a Two-Level System This appendix details how to derive the total column density of a linear rigid-rotor molecule, such as CO, from the observed brightness of its rotational transition. ... C.2 Radiative Transfer for a Two-Level System I now consider emission in a two-level system from an upper J + 1 (denoted `u') to lower J (denoted `l') state. ... Spontaneous emission is controlled by the A coefficient, with a rate Aul nu . ... Tex exp(-31. ...

... STScI-PRC98-11A STARING INTO THE WINDS OF DESTRUCTION: HST/NICMOS IMAGES OF THE PLANETARY NEBULA NGC 7027 The Hubble Space Telescope's Near Infrared Camera and Multi-Object Spectrometer (NICMOS) has captured a glimpse of a brief stage in the burnout of NGC 7027, a medium-mass star like our sun. ... The material settles into a wind of gas and dust blowing away from the dying star. ... During this phase, intense ultraviolet radiation from the central star lights up a region of gas surrounding it. ...

... 2006 July 14 . The Colorful Clouds of Rho Ophiuchi . ... Explanation: This stunning mosiac of the sky around bright stars Antares (Alpha Scorpii ) and Rho Ophiuchi reveals spectacular colors in a cosmic starscape. ... About 500 light-years away, the Rho Ophiuchi star clouds , are well in front of the nearby globular star cluster M4 , visible just below and right of center. ... About APOD | ... NASA Web Site Statements, Warnings, and Disclaimers . NASA Official: Jay Norris. ...

... Tonight's Sky . ... News . Observing . ... Supernova showered Earth with radioactive debris . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . ... Supernova simulations reveal new processes . ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. ...

... Meta Index / Home Page / Description / Soft flare rejection for . The EPIC-pn fast timing mode was designed so that a time resolution of 0.029 milliseconds can be achieved. ... Below this energy the data is affected by so-called soft flares which are caused by stack overflows generated by high energy particles. These so-called soft flares have sharp rise (from 0 counts/sec to several thousand counts/sec in 0.10-0.15 sec) then decaying back 0 counts/sec slightly slower in about 0.3-0.4 sec). ...

... 2MASS Overview . The 2MASS Sky . Executive Summary of 2MASS Second Incremental Data Products . Point Source Catalog . Extended Source Catalog . ... Distribution Mode for 2MASS Products . Data Release Plan . ... Point Source Catalog (PSC) . Extended Source Catalog (XSC) . ... 2MASS Source Naming Convention . ... General Properties of the Data Release . ... Comparison of Achieved Performance of Second Incremental Release Catalogs with Level 1 Science Specification . ...

Next: Gravitational Wave Background from Previous: Galactic Gravitational Wave Background . ... It is intuitively clear that at frequencies above the critical ones for our Galaxy, one will detect rare bright jerks produced by coalescing white dwarfs   (at a rate of 1 per 100 year) and NS (at a rate of 1 per - year) in our Galaxy, against a background of the extragalactic stochastic GW. ... Firstly we consider GWB from close individual galaxies, and then will discuss overall extragalactic GWB. ...

... A consistent theory of turbulence has not been constructed as yet (this problem is linked with one of the one million dollar problems of the Clay Mathematics Institute), and therefore researchers all over the world rely on computer simulations to understand the underlying physics and processes in star forming environments. As computer power grows our simulations become more and more realistic, allowing us to include a lot of interesting and potentially vital physics into our models.  ...

To run a process in the background as a job and carry on working add an (ampersand) at the end of the command line. ... The shell forks a child process to run the command and displays the job number ( [ n ] ) and the PID (Process IDentifier) number. ... If the command is likely to produce error messages you will need to redirect standard error. ... Do not run an interactive command that requires you to type something at the terminal as a background job. ... You will then have to kill its process . ...