... NGC 1512: A Panchromatic View . ... ESA , NASA Explanation: This spectacular color picture of the core of barred spiral galaxy NGC 1512 (bottom panel) is a composite of the seven Hubble Space Telescope images arrayed along the top. Each top panel image was made with a filter and camera sensitive to a different wavelength band in the electromagnetic spectrum . ... What caused this cosmic starburst ring? ... NGC 4314: A Nuclear Starburst Ring . ... Starburst Ring in Galaxy NGC 1317 . ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2001 June 6 . NGC 1512: A Panchromatic View . ... Each top panel image was made with a filter and camera sensitive to a different wavelength band in the electromagnetic spectrum . ... These images show that the center of NGC 1512 appears dramatically altered when viewed in different wavelength bands. ... About APOD | ...

Stellar Clusters are very useful laboratories for empirically studying stellar evolution. ... All cluster stars are at the same distance . All cluster stars have the same physical age . ... CM diagram Young Cluster In this case we see the Main Sequence fully represented. The blue dots represent massive stars with short main sequence lifetimes. ... Thus, identifying the most massive star which is still on the main sequence is an effective means of determining the age of a stellar cluster. ...

Making HST Pictures: Examples and Illustrations . ... These illustrations represent some of the steps and techniques used to produce “pretty pictures” from HST images. ... TIFFs (ftp) . ... Separate images are exposed through different color filters. ... An alternate way to make color images . ... Eight bit (one byte) images contain 256 different values that may be represented by 256 shades of gray or 256 arbitrary colors from a color map (or palette) of all possible colors. ...

... Forum: The Linux Kernel Hackers' Guide . Re : Does memory area assigned by "vmalloc()" get swapped to disk? ... I am sure mlock() works fine..and I will also use sys_mlock() in my kernel code if I have to but the problem with it is that my kernel code becomes part of any user process as it is a Prefetching system and mlock() as seen from its implementation checks for the super user privileges suser(). ... I was thinking if the fixed size array (e.g. buffer[100]) gets swapped to disk. ...

. F IGURE . 4. Kinematic diagrams for (a) all Galactic GCs, (b) thick-disk clusters, and (c) halo clusters. The dot sizes are proportional to the weights assigned. The straight lines are rms regression fits and their slopes yield the rotational velocity of the corresponding subsystem, V rot . discussion in the text | previous figure | next figure .

... 633Slee+ Fifty-eight fields near rich clusters of galaxies were surveyed with the Very Large Array using scaled arrays in the B/C and/or C/D configurations at 1.5 GHz and 4.9 GHz. The fields were centered on steep spectrum sources in or near clusters that were earlier surveyed with lower resolution telescopes. ... The columns are : . Column 1 Cluster Field (Z1518 = Zw1518.8+0747) . Column 2 distance of source from cluster centre in Abell radii . ... Column 5 1.5 GHz flux (mJy) . ...

... Bad Astronomy . ... Bitesize Astronomy . ... Last week's Snack talked about how black holes can affect the environment around them in such a way as to be very bright . ... It's a common misconception that black holes always have matter swirling into them. ... As this matter gets closer and closer to the black hole it piles up and a large, fairly flat disk forms. This is called the accretion disk , because matter from this disk accretes (that is, falls in) on the black hole. ... 2008 Phil Plait. ...

... ATNF Home . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Murchison Radio-astronomy Observatory . ... Parkes radio telescope . ... Mopra radio telescope . ... Australia Telescope 20GHz Survey . ... Visiting Parkes radio telescope . ... Parkes radio telescope webcam . ... The results of 21 cm H I survey observations are presented for two fields, centered on the Centaurus and Fornax southern galaxy clusters. ... Implications for the Parkes Multibeam All Sky Survey . ...

The Cartwheel Galaxy . This false-color composite image shows the Cartwheel Galaxy as seen by the Galaxy Evolution Explorer's far-ultraviolet detector (blue); the Hubble Space Telescope's Wide Field and Planetary Camera 2 in B-band visible light (green); the Spitzer Space Telescope's infrared array camera at 8 microns (red); and the Chandra X-ray Observatory's advanced CCD imaging spectrometer-S array instrument (purple). ...

... Omdetect uses two different algorithms for source-detection - one is optimised for detecting point-like sources, and the second is optimised for detecting extended sources. ... Two separate lists are used mainly because the detection algorithms for point and extended sources are different, and also because the photometry of the two types is done differently. ... The number of pixels that an extended source contains. ... Point-source detection algorithm . ... Extended-source detection Algorithm . ...

... High Performance Radio Astronomy Signal Processing . The upcoming Arecibo Focal Plane Array and large radio telescope arrays such as the Allen Telescope Array (ATA), and the square kilometer array (SKA) require peta-ops of real time signal processing. Such computational requirements are far beyond the capabilities of general purpose computing clusters (eg: Beowolf clusters) or supercomputers. ...

Main Page Data Structures File List Data Fields Globals . ... int . read_oi_array (fitsfile *fptr, char *arrname, oi_array *array, int *status) . Read OI_ARRAY fits binary table. More... int . read_oi_target (fitsfile *fptr, oi_target *targets, int *status) . ... read_oi_wavelength (fitsfile *fptr, char *insname, oi_wavelength *wave, int *status) . ... read_next_oi_vis (fitsfile *fptr, oi_vis *vis, int *status) . ... read_next_oi_vis2 (fitsfile *fptr, oi_vis2 *vis2, int *status) . ...

... n For illustration, examine a coarsened (256 в 256) set of images, with 3 clusters Clustering AIA data Clusters in log Y space Clusters in Y /n space Distribution of pixels in each cluster Distribution of pixels in each cluster Simulated Data Simulated Temperature Distributions 4 5 6 logT 7 8 9 Simulated Data Simulated Data Simulated Data Simulated Data Simulated Data: Results Simulated Data: Results Simulated Data: Results Simulated Data: Results How to make images of results more meaningful? ...

ATMoB "Open Cluster Observing Award " Guidelines Purpose: To promote observing among the membership of the Amateur Telescope Makers of Boston through participation in the Open Clusters Observing Awards program. Introduction: This awards program is oriented towards visually observing open clusters above magnitude 9.9. ... It turns out that a very unprejudiced and convenient method to dermine the limiting magnitude is to count the number of visible stars in certain areas on the sky. ...

... ESO, the European Southern Observatory . ... ESO . ... Galaxy Clusters . ... Star Clusters . ... Video News Releases . ... Stars@ESO . New on eso.org . ... This video sequence shows a comparison of the view of the newly discovered globular cluster VVV CL001 in visible and infrared light. The infrared view, from the VISTA telescope, shows the new cluster very clearly for the first time and allows many of the component stars to be studied. ... Milky Way : Star : Grouping : Cluster : Globular . ...

... ClassX is a project aimed at creating an automated system to classify X-ray sources and is envisaged as a prototype of the Virtual Observatory. ... The most fundamental are: (a) classification methods and algorithms, (b) selection and definition of classes (object types), and (c) identification of source counterparts across multi-wavelength data. ... Using different sets of training parameters (attributes), we get different classifiers for the same list of class names (e.g., Figure 1). ...

... The choice of which type of electricity is called "positive" and which "negative" was made around 1750 by Ben Franklin, early American scientist and man of many talents (the stamp on the left commemorates his role as first US postmaster--and colonial postmaster before that). ... Franklin knew of two types of electric charge, depending on the material one rubbed. ... Later, when electric batteries were discovered, scientists naturally assigned the direction of the flow of current to be from (+) to (-...

... The choice of which type of electricity is called "positive" and which "negative" was made around 1750 by Ben Franklin, early American scientist and man of many talents (the stamp on the left commemorates his role as first US postmaster--and colonial postmaster before that). ... Franklin knew of two types of electric charge, depending on the material one rubbed. ... Later, when electric batteries were discovered, scientists naturally assigned the direction of the flow of current to be from (+) to (-...

To read standard input into a shell script use the read command. For example: echo "Please enter your name:" read name echo "Welcome to Edinburgh $name" . This prompts the user for input, assigns this to the variable name and then displays the value of this variable to standard output . ... For example: echo "Please enter your surname\n" echo "followed by your first name: \c" read name1 name2 echo "Welcome to Glasgow $name2 $name1" . ...