Notes on Patrick's 2006/03/10 News - NGC2841 - a UMa galaxy visible during March
In Patrick's 2006/03/10 News, there is an article featuring NGC2841, a mag 9.9-10.3 galaxy (6.2" x 2") in the Leo Spur and UMa constellation: NGC2841: Galactic Chimneys Turn Up the Heat http://chandra.harvard.edu/photo/2006/n2841/ Although not visible in amateur visual wavelengths, the Chandra X-ray image of NGC2841 shows how supernovas generate hot gas chimneys and gas plumes that rise out of a galaxy's plane. The clouds then cool, condense and lose their momentum - and sometimes are drawn back down as high-velocity clouds. These high-velocity clouds then crash into the pre-existing molecular clouds in the galactic plane and initiate a new round of star creation. NGC2841, when the current Moonless dark-sky frame starts on March 17, will be favorably positioned for observing at 41N Lat ops. My observing planner spreadsheet is not showing the galaxy as being detectable in a mag 5.5 SPOC sky (object MPSAS is 21.66, a mag 5.5 sky is 20.1 MPSAS), but it is within the range of uncertainty. It may be necessary to travel to a darker sky site to view this galaxy. I haven't personally viewed this one, but the CDS-Aladin and NGC Project photos show it to be a nice-looking grand design spiral. The stats on galaxy NGC2841 for March 17, 2006: Object: NGC2841 Con: UMa PosJ: J092200.00+505812.0 PosAzA: Az054.57 Alt+65.24 on 2006/3/17 approx. 3:00-5:00 UTC (8:00-10:00pm) LHA: 327.19 on 2006/3/17 3:00 UTC Other pointing reference: Star HD080566, mag. 8.5 is within 1 deg. TypeSimbad: LIN TypeClark: Sb MagSimbad: 9.9 MagClark's Catalogue: 10.3 Computed MPSAS: 21.66 Distance: 12000kpc per Tully(1988a) Object cross-references: PGC026512 (for "The Sky" users) Clark 199 Herschel 205-1 Online pics and info: Simbad link: http://simbad.harvard.edu/sim-id.pl?protocol=html&Ident=NGC2841 NGC Project database: http://www.ngcic.org/ngcicdb.asp - Canopus56 (Kurt) __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
--- Canopus56 <canopus56@yahoo.com> wrote: To correct:
NGC2841, a mag 9.9-10.3 galaxy (6.2" x 2") s/b 6.2' x 2' per Clark. The NGC database lists it at 8.1' x 3.8'; Simbad 1.88' 0.32' (probably blue filter)
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--- Canopus56 <canopus56@yahoo.com> wrote:
Although not visible in amateur visual wavelengths, the Chandra X-ray image of NGC2841 shows how supernovas generate hot gas chimneys and gas plumes that rise out of a galaxy's plane. The clouds then cool, condense and lose their momentum - and sometimes are drawn back down as high-velocity clouds. These high-velocity clouds then crash into the pre-existing molecular clouds in the galactic plane and initiate a new round of star creation.
You should google up a high resolution image of NGC 253. It bubbles like a pizza fresh from the oven. Doing some research for this I ran across astrophotos for NGC 253 going back all the say to 1991. It's amazing what can be done with cameras avalible to amateurs today compared to professional photos from just a few years ago. I can't put up my most recent copy because I took it from the a discussion group and I don't know who deserves the credit for it. It might be Bob Gendler on the SBIG group. APOD has a some nice ones that chart the recent advances in photography. DT __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
--- daniel turner <outwest112@yahoo.com> wrote:
You should google up a high resolution image of NGC 253. It bubbles like a pizza fresh from the oven.
Looks like there is a bunch of Apods on NGC 253. http://antwrp.gsfc.nasa.gov/apod/ap010607.html http://antwrp.gsfc.nasa.gov/apod/ap981209.html http://antwrp.gsfc.nasa.gov/apod/ap030525.html I see what you mean - those dark lanes rising out of NGC 253's plane in the inner arm segments. NGC 253 is in starburst phase, unlike NGC 2841 whose core is inactive and more "normal" like the Milky Way. I'll have to mark my calendar to give NGC 253 it a closer look see with the bigger aperatures at SPOC - when it swings around in the autumn. Thanks for the head's up. - Canopus56 (Kurt) __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
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