Arecibo Observatory

Finding information and images

Below, we provide links to the entries for 5 interesting galaxies in several public extragalactic databases: the Sloan Digital Sky Survey, the SkyView Digital Sky Survey 1, the Digital Sky Survey 2 Red and Blue, and the NASA Extragalactic Database (NED). Note that the links to DSS1 and DSS2 are provided both at image sizes of 0.03 degrees and 0.1 degrees; for the SDSS image, experiment with the Navigator Tool to learn to zoom in and out, recenter, etc. The NED link provides you with a list of all entries in that database within 10 arcmin around the chosen position. We will discuss more about these images after you look at them!

In all cases, provide the name of the object as you find it in the NED. Then answer the questions asked in each case.

  1. Describe the central regions of this object.
    084911.8+601314     132.2992 60.2206         Explore ObjID        DR5Navigate     DSS1 0.03 deg     DSS1 0.1 deg     DSS2red.03     DSS2blu.03     DSS2red.10     DSS2blu.10     NED

  2. Does the spectrum detected by the SDSS show emission or absorption lines? What is the strongest line?   Hint: Use the SDSS Explore Tool.
    1119144+115707     169.8100 11.9519         Explore ObjID        DR5 Navigate     DSS1 0.03 deg     DSS2 0.1 deg     DSS2red.03     DSS2blu.03     DSS2red.10     DSS2blu.10     NED

  3. What is the redshift of this object? Just for fun, zoom out the SDSS Navigator tool to a scale of 12.676 arcsec/pix. Is there anything interesting to make note of?
    112016.9+133513     170.0704 13.5869         Explore ObjID        DR5Navigate     DSS1 0.03 deg     DSS1 0.1 deg     DSS2red.03     DSS2blu.03     DSS2red.10     DSS2blu.10     NED

  4. Be sure to use the SDSS Navigator tool to zoom out several times (e.g., so the scale is 6.338 arcsec/pix). Describe the surroundings of this object.
    140211.3+092623     210.5471 9.4397         Explore ObjID        DR5Navigate     DSS1 0.03 deg     DSS1 0.1 deg     DSS2red.03     DSS2blu.03     DSS2red.10     DSS2blu.10     NED

  5. What's so odd about this object (as it appears in all the images)? What do you notice when you zoom the SDSS image to a scale of 12.676 arcsec/pix?
    140501.4+533944     211.2558 53.6622         Explore ObjID        DR5Navigate     DSS1 0.03 deg     DSS1 0.1 deg     DSS2red.03     DSS2blu.03     DSS2red.10     DSS2blu.10     NED



Last modified: Mon Jan 22 13:02:17 2007 by martha