Next: Emission-line galaxies Up: The Hamburg/SAO Survey for Previous: Line parameter measurements . In total 108 new candidates and 5 known ELGs have been observed. ... Only 2 of the latter have good enough S/N ratio to identify absorption features enabling to measure their redshifts. The remaining 20 objects appeared to be either stars with characteristic absorption lines or stellar objects with featureless spectra where the signal-to-noise ratio was insufficient to identify lines. ...

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... 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. ...

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... Tonight's Sky . ... Sky this Month . ... Star Atlas . ... stars . ... The Sky This Week: April 1 - 10 . ... Observing springtime deep-sky objects with a large telescope . ... Why do some stars appear to flash a variety of different colors when you look at them through a telescope? ... So, Earthт??s atmosphere will bend some colors from especially bright stars more so than others, which makes the source look like itт??s flashing colors. Get instant access to subscriber content on Astronomy.com! ...

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• Can you explain Mercury's retrograde motion? Do other planets appear to do this
• Why do the constellations and the Moon appear upside down from the Southern
• How were the constellation boundaries set? They appear pretty arbitrary. |

... 2005 August 8 . Mars to Appear Normal This August . ... Regardless of numerous urban legends circulating, Mars will appear relatively normal in August. October is the best month to see Mars this year. ... As Earth catches up to Mars in their respective orbits around the Sun, Mars will keep rising earlier in the night. On 2005 October 30, Earth will have caught up to Mars and the planets will be the nearest to each other in their orbits -- this time around. ... About APOD | ...

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• APOD: 2014 January 29 - Jelly Donut Shaped Rock Appears on Mars
• APOD: 2010 November 29 - Dark Belt Reappearing on Jupiter
• APOD: 2016 January 31 - MWC 922: The Red Square Nebula

Spitzer Space Telescope mid-infrared spectroscopy has been obtained for 15 carbon-rich protoplanetary nebulae (PPNe) in the Large Magellanic Cloud (LMC) and for two other such stars in the Small Magellanic Cloud (SMC). Of these 17 PPNe, the unidentified 21 ѕ®m feature is strong in 7 spectra, weak in 2 spectra, and very weak or questionable in 4 spectra. ... The remaining two objects show typical carbon-rich PPNe spectra with no 21 ѕ®m features. ...

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• The Most Common Dust Features
• Quasar Spectral Features at Intermediate Redshift
• Terrestrial Silicates Compared to Astronomical Silicates

... Sometimes, it's fun to share the sky. Although it might appear that the two sky enthusiasts on the ridge are sharing only a crescent moon between them, three bright planets also stand before them. ... Meteors streaked through the sky above many of Earth's cities last week, but nobody was hurt, and no damage has been reported. ... Clearly, dark windblown sand surrounds outcropping of light sedimentary rock across the floor of crater Arabia Terra. ... The Sand Dunes of Titan . ... August . ...

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These are very prominent absorption lines is most all galaxies. ... These pair of absorption lines will appear in all the spectra and they should be your principle source for determining the redshift. ... When this applet opens you will see an iconic representation of galaxies in the left hand side of the applet and a target area in the right side of the applet. ... Note: What you are doing in this excercise is identical to what Hubble did in the 1920's and you are using the same galaxies. ...

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• The Galaxy Gallery: Messier Objects

... Here some data observed on the 6m telescope with IFP installed in the OLD focal reducer are presented. ... Mkn 3: velocity field . ... NGC 5252: [OIII] image . ... NGC 5252 was observed 23 Feb. 1998 in the [OIII]5007 emission line with CCD TK1024 as detector. ... We observed the ionized gas velocity fields of the spiral galaxies with two purpose. ... Restored velocity field of NGC 157 in the reference frame rotating with the pattern speed overlaid on the Ha image of the galaxy . ... NGC 4100 . ...

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• Emission molecular bands
• [NEdit] FAQ: Features
• The peculiar post-AGB supergiant IRAS04296+3429: optical spectroscopy and its

... ESO, the European Southern Observatory . ... Travel and Contacts . Travel to ESO Headquarters . ... ESO . ... Survey Telescopes . ... ESO Supernova . ... Star Clusters . ... Stars@ESO . ... ESO 3.6-metre telescope . ... MPG/ESO 2.2-metre telescope . ... ESO 1-metre Schmidt telescope . ... Future Projects . ... This NASA/ESA Hubble Space Telescope image shows the positions of the past, present and predicted future appearances of the Refsdal supernova behind the galaxy cluster€а MACS J1149+2223 . ...

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• ESO - I see unexpected boxy emission-like features in my REDL spectra - where
• Spectroscopy
• Circinus Galaxy before and after SN 1996cr appeared | ESO

... In 1995, two intermittent detector features (aka hotspots) particular to the ROSAT HRI have been noticed on the edge of the HRI field. ... To view the hotspots: . HS #1 > xdisplay "rh123456n00.qp[key=(rawx,rawy)][186:697,230:741]" HS #2 > xdisplay "rh123456n00.qp[key=(rawx,rawy)][3380:3891,297:808]" HS #3 > xdisplay "rh123456n00.qp[key=(rawx,rawy)][2753:3252,3065:3564]" OR > xexamine rh...qp[key=(rawx,rawy)] [HS #1, if present, appears as a spot in the lower left; HS #2 in the lower right.] ...

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• The AstroStat Slog Blog Archive Bayesian machine learning workshop, featuring
• X--ray Quiet PMS Candidates
• Features of the PROS software

... This chapter documents all the JavaScript objects, along with their methods and properties. ... Full entries for each object appear in alphabetical order; properties and functions not associated with any object appear in Chapter 2, "Top-Level Properties and Functions." ... Tables included in the description of each object summarize the object's methods and properties. Full entries for an object's methods and properties appear in alphabetical order after the object's entry. ...

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• Uranus' Moon Ariel
• New Features in this Release
• APOD: 2001 January 21 - Resolving Mira

... Using the DRAO Synthesis Telescope (Landecker et al. 2000), the Canadian Galactic Plane Survey ( CGPS ; Taylor et al. 2002) has captured a multitude of HISA features, the majority of which are invisible in prior surveys at lower resolution. ... Since the HISA gas temperature must be less than the background brightness temperature, all the H I shown in this poster has T ~ 100 K. Figure 1 provides panoramic views of the cold H I visible as HISA in the CGPS. ... GIFs: HISA + CO | HISA only | ...

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• What is HISA?
• HISA Poster for the 195th Meeting of the AAS, January, 2000
• First Galfa H I Map

spaceweb@oulu.fi - last update: 18 February 1997, 1100 UT (RR) . Black aurora is a lack of auroral emission in a small, well-defined region within an otherwise uniform, diffuse background or within auroras exhibiting a degree of shear behaviour intermediate between that of diffuse and discrete aurora (e.g., Davis, 1978). It appears to be a common feature of the midnight sector during late substorm recovery phase (Trondsen and Cogger, 1997). ... 30 , 371-380, 1978. ... 102 , 363-378, 1997. ...

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• Mars' Moon Phobos

. Fig. The SOHO/EIT 171 image (a) illustrating a pronounced transequatorial inverted V-shaped chain 1-2-3-4 which appears to outline the large soft X-ray CH observed with the Yohkoh/SXT (b) on March 1-2, 1999. The BBSO H-alpha (c) and MLSO/HAO He I 10830 (d) heliograms are shown to demonstrate relation of this and some other EUV chains to other large-scale structures such as H-alpha filaments and He I 10830 features. Back to paper .

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• Chains and CMEs
• The 14 July 2000 meter-wavelength dynamic radio spectrum
• CMEs and Space Weather

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . Sequence of four video frames captured at 01:05 BST at Armagh Observatory on the night of the 24/25th July 2013, showing the onset, development and demise of the sprite. ... Unlike common lightning discharges, which often jump between clouds or between the clouds and the ground, sprites are associated with similarly powerful electrical fields that occur high above the clouds of the EarthтАЩs atmosphere. ...

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• Terry Mosely's Bulletins
• Bright Point Studies
• Featured Image | International Year of Astronomy in Ireland | Astronomy 2009

To Do List ========== November 10, 2007 =============== Progress in base code not yet on this site will appear in the next beta version released here. ... Features in development for the next stable release include TDI with absolute timing Binning and subarea readout Autoguiding with the tracking control and adaptive optics features XML based server/client for remote use Command line version Browser version Connection to XmTel and XEphem for coordinate information in FITS headers ...

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• http://www.astro.louisville.edu/software/sbig/archive/xmccd-4.2.1/xmccd-4.2.1/BUGS

Giant radio galaxies constitute a class of radio sources with linear sizes on the megaparsec scale (Saripalli 1988). ... The Westerbork Northern Sky Survey (WENSS) has discovered several cases of "inner-double" or "double-double" giant radio galaxies: the findings suggest that such structures predominantly occur among the larger of radio galaxies. ... Close to the core of B0114-476, a narrow jet-like feature is seen directed toward the southern inner lobe which also has the brighter hotspots. ...

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• Spectroscopy Questions
• Duchamp Source Finder
• ATNF Daily Astronomy Picture

... The HH flow associated with young stellar object HL Tau has an exciting history and even until now the origin of some its features is not clear yet. ... Knotty structures of Herbig-Haro jets are common phenomena and knowing the origin of such structures is essential for understanding the processes of jet formation. ... In the flow detected compact knots with high (-150 km/s) and bow shape structures in front of those, with low radial velocities (-50 km/s). ...

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• Galaxy sector, archive 2004

... A rough estimation is that in the United States there is one planetarium per 100,000 population, ranging in size from the Hayden Planetarium's 20-meter dome seating 430 people, to three-meter inflatable portable domes where children sit on the floor. ... Together dblo associates make a huge impact in the architecture, interior design and development arena in London. ... With the holidays around the corner what better way to spoil your family than with your very own private home cinema. ...

20. ASP: Accidental Astrophysics: The Devil's In the Magnitudes, Part II