Astr 620 Fall 2011Galaxies Sylvain VeilleuxSeptember 12, 2011 DUE: September 21, 2011PROBLEM SET # 1This problem set is intended to intro d uce you to some of the extragalactic researchtools currently available on the Web. Refer to the “ASTR 620 Useful Web Links” onthe class home page to get the appropriate URLs.Problem 1.Access NASA’s Extragalactic Database (NED) and answer the following questions:(a) What is the De Vaucouleurs’ morphological type and mean optically deter-mined (heliocentric) systemic velocity of the Circinus Galaxy in km sec−1.What is its corresponding distance? Make sure to explain which distanceyou’re using. This is one of the neare st AGN known.(b) Print out the spectral energy distributions [i.e. log fν(in Jansky) as a functionof log ν ] with erro r bars for Arp 220 and 3C 273. Notice the difference s! Ithas been argued that Arp 220 will eventually become a quasar like 3 C 273;what has to happen according to the SEDs?(c) Print out the SDSS spectrum NGC 4395, a well-studied low-luminosity AGN.How many papers have been written on it?(d) Use on the cosmology calculators to determine the age of the universe atredshift z = 7.7 and the corresponding scale in kpc per arcsecond . Make sureto tell me the cosmological parameters that were used for these calculations.Problem 2.(a) Use the Multimission Archive at STScI to find and print out a far-ultravioletspectrum of the Palomar-Green QSO PG 1116+215 obtained with the Far-Ultraviolet Space Explorer (FUSE). Why are there so many absorption lines?!(b) Use the Aladin S ky Atlas at the Centre de Donn´ees Astronomiques de Stras-bourg to find and produce a multi-wavelength image showing a high-reso lutionVLA image of Arp 220 that s hows the well-known double nucleus, superposedon an optical or near-infrared image of the same object. Make s ure to showthe angular scale on the data.Problem 3.Use the astro-ph archive on the Web to answer the following questions:(a) What is the latest paper in the archive re lating to NGC 1068 in the title?(b) Print out in color Figure 4 of my recent Astrophysical Journal Letters paperwith D.S.N. Rupke.Problem 4.Use the Astronomical Data System (ADS) Abstract Service on the Web to answer thefollowing questions:(a) Print out the english version of the title from a 1899 paper in the BulletinAstronomique by A. Perot and C. Fabry. They went on to crea te the Fabry-Perot interferometer together...(b) In 2007, Spergel et al. published an article on the results from the 3 -yr WMAPdata. Give the fu ll reference and mention the number of times this paper hasbeen cited in the sc ientific literature. This is one of the highest citation ratesof all time! How many times has this p aper bee n