In this section we present plots which may be used to rapidly estimate signal-to-noise ratio (SNR) for point sources with stellar spectra observed through popular WFPC2 filters. ... One uses these plots as follows: . ... Dotted lines across the top of each plot indicate the onset of saturation. ... We look at Figure B.10 and find this value on the horizontal axis. ... This exposure is well below the saturation lines in the plot, so saturation is not a concern. ... 0.45 Figure B.1: Point Source SNR vs. ...

... This thread contains a step-by-step recipe to extract MOS spectra of a point-like source observed in Imaging mode and to create associated response matrices, starting from a calibrated, concatenated event list (either produced with emproc or available as PPS product; here it has the assumed file name MOS.fits ). ... The users should note that the SAS metatask xmmselect allows them to interactively define source and background regions (via ds9) and to run backscale on the fly. ...

This paper describes the Duchamp source finder, a piece of software designed to find and describe sources in 3-dimensional, spectral-line data cubes. ... This paper details some of the key algorithms used, and illustrates the effectiveness of the finder on different data sets. | ... Australia Telescope National Facility . PO Box 76, Epping, . NSW 1710, . ... You can now find me in room 99 at Epping. Home Duchamp Duchamp downloads Links Publications Astro Acronyms Japanese Poetry ...

... We will consider the rms, (K), for observations with a receiver of system temperature, T , frequency resolution, per polarization, and total integration time per observing cycle, . ... For ``in-band'' frequency switching, the line under investigation is always in the observing band. ... Position Switching or ``Out-of-Band'' Frequency Switching: Here the line is only observed for one half of the time, with noise being present all of the time. ...

... The Einstein On-Line Service (EOLS) is a simple menu-driven system which provides an intuitive method of querying over one hundred database catalogs. In addition, the EOLS contains over 30 CD-ROMs of images from the Einstein X-ray Observatory which are available for downloading. The EOLS provides all of our databases to the NASA Astrophysics Data System (ADS) and our documents which describe each table are written in the ADS format. ... The EOLS provides three options for data retrieval. ...

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... Observing . ... Home Observing High Line ? Solar Observing . ... High Line . High Line - Solar Observing . ... Beyond New York City . ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . ... A History of the First Forty Years of the Amateur Astronomers Association . ... The AAA hosts solar observing on the High Line one Tuesday afternoon each month from April through August. ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by . ...

... Bojan Nikolic web pages (r. 329) . ... SCons user manual http://www.scons.org/doc/1.2.0/HTML/scons-user/book1.html . SCons man page (on web at http://www.scons.org/doc/HTML/scons-man.html , or man scons ) . ... SCons is a tool to build compile source code into (closer-to) executable format. ... Curiously, the shared-library SCons builder will accept multiple identical sources and pass them all to the linker, which will normally lead to ?multiple definition? errors. ... Introduction to SCons . ...

Available Models Source Effective Area Blurring Matrix Counts Area Exp. ... Time Background FILTER Ratio Continuum Line Absorption Model Specification Data Agumentation Parameter Initialization ARF RMF Source Counts Bkg Counts Set Priors Transformation for GLM Separate Bkg counts Remove RMF Blurring Separate lines and continuum Restore absorbed counts Compute Loglikelihood [Conditional] Expectation - procedures Draw Parameters No Done? Yes OUTPUT: Filter Indicator Energy vs. ARF Channel vs. ...

In calculating the NIFS sensitivity, we adopt a read noise of 5 e - , a dark current of 0.01 e - s -1 pix -1 , and a maximum exposure time of 3600 s. Grating . ... e/pix) . ... OH Cont. (e/pix) . ... NIFS should achieve signal-to-noise ratios of ~ 10 per spectral pixel in a 0.1" 0.1" aperture for single 1800 s exposures on uniform, extended, continuum sources with surface brightnesses of J = 15.4, J = 15.0, H = 14.8, and K = 13.5 mag arcsec -2 using the Z , J , H , and K gratings, respectively. ...

... General information . ... Staff . Research staff . Technical, administrative & librarian staff . ... Staff in alphabetic order . Research . ... Solar physics . ... Information . Resources and catalogs . ... Historical highlights . Historical research . Historical archive . ... Online resources . Friends of Arcetri . ... NSSDC - National Space Science Data Center . ... a rXiv e-Prints archive . ... High Energy Astrophysics Science Archive Research Center . ...

For calculating model spectra of early-type helium stars in LTE, we maintain a database of atomic data for, mostly, blue-visual absorption lines of light elements. The data is sorted with one file for each ion. ... III = ++ . ... It will work on both complete linelists (including the atomic data at the start and references at the end) or raw ion files (such as Ni2.d). ... A Fortran utility to convert linelists downloaded from the Vienna Atomic Line Database into the new QUB format. synspec_qub . ...

... J/ApJS/117/319 Northern RASS X-ray sources catalog (Appenzeller+ 1998) ================================================================================ Identification of a complete sample of northern ROSAT All-Sky Survey X-ray sources. ... Redshift for extragalactic sources 115-119 F5.2 mag Vmag ? ... Note (2): Net X-ray source count rate as derived after superposition of all ROSAT scan stripes and correction for vignetting and dead time. ...

... HeB , N IRAS sc BiD, ImA HD 288313 05 54 03.00 +01 40 22.0 9.93 K2e tab6_05.ps tab6_05.jpg spec6_05.ps BD+01њ1156 Y-WeT Late Sp.T. LkH 341 06 30 50.13 +10 33 09.8 13.36 B3e tab6_06.ps tab6_06.jpg spec6_06.ps N-TiS Very weak IRAS sc - WeJ HeB MWC 148 HD 259440 06 32 59.26 +05 48 01.2 9.11-9.17 B0/6ep tab6_07.ps tab6_07.jpg spec6_07.ps BD+05њ1291, Hilt 568 N-TiS In NGC ... TiS N IRAS sc-WeJ HeB LkH 350 22 49 07.23 +62 11 08.5 13.51 B2/5e tab6_34.ps tab6_34.jpg spec6_34.ps N-WeJ Norm Be star?? ...

... Currently if we insert or update a line in the ts_readme table, we have to remember to also update the ts_vec column. ... CREATE TRIGGER ts_readme_ts_vec_update BEFORE UPDATE OR INSERT ON ts_readme FOR EACH ROW EXECUTE PROCEDURE tsearch2(ts_vec, line); INSERT INTO ts_readme (line_number, line) VALUES (211, 'Adding another line to tsearch readme file.' SELECT * FROM ts_readme WHERE line_number = 211; -[ RECORD 1 ]--------------------------------------------------------- line_number | 211 line | ...

Not on-site at APO, but can be obtained on loan--contact Jeff Morgan at UWash, morgan/astro.washington.edu . CENTER( ) PASSBAND( ) NEBULAR LINE (OR CONTINUUM) . 4861 60 Hbeta 5007 60 [O III] 6301 10 [O I] -- [S III]6312A line is supressed 6563 10 Halpha -- [N II]6584 and 6583 lines are suppressed 6583 10 [N II] -- Halpha line is suppressed 6728 80 [S II]6717+6731 4686 60 He II 4760 100 blue cont or Fe II 8290 195 red cont. See also the Hodge filter set below. ... APO Filters Homepage ...

... It was discovered during 1970's that radiation from electrical power transmission lines is one source of whistler-mode waves in the magnetosphere . Most of the world's power systems use 50 Hz or 60 Hz, but their harmonics in the kHz range (due to mechanical imperfections, nonlinear loads, etc.) can be radiated by transmission lines and leak into the magnetosphere with sufficient intensity to stimulate wave growth and emission generation, much like the VLF transmitter signals. ...

... In one situation, we can use light from quasars to probe the material between us and them because that light may pass through one or more galaxies or gas clouds on its way to us. The gas inside the galaxies or the intergalactic clouds acts then as a filter, absorbing selected wavelengths from the quasar light. ... Light from a quasar must pass through clouds of gas and even faint galaxies -- each leaving its imprint on the light -- before we receive it here on Earth. ... Gravitational lensing . ...

The Astronomy Net . Articles | ... Forums . ... I have moved the entire Astronomy family of sites to a nice new server with the help of your previous contributions and personal funds. This server contains this site plus those listed at Astronomy Net . ... This site - www.astronomy.net - by itself sends about six billion bytes of information to visitors every month. ... I count on donations from patrons to help me keep Astronomy Net on the internet servicing the astronomy community. ...

RTT150 . ... This search system is designed for generating the necessary information on series of pointings (observations of each source consist of sets of exposures with different filters and sometimes with different exposure times) for observed sources. Search results appear at the separate page as a table with the following data: . DATE - real (not evening!) observations date (in YYYY-MM-DD format); . ... Bin - minimal CCD binning mode (may vary during the observations); . ...