Overlapping galaxy pairs
This page links material from the Galaxy Zoo survey for overlapping-galaxy pairs, useful for studies of dust absorption. This survey of the sample derived from the Zoo 1 and Zoo 2 periods (August 2007 - April 2010) is described in detail by Keel et al. (2013). The resulting catalog of 1990 galaxy pairs is available as plain text or in a sortable JavaScript version (click on a column heading to sort on that quantity).
The file overlapcatalog.txt contains the complete catalog of overlapping-galaxy pairs described in Keel et al. (2013). In plain text ASCII, its layout is as follows:
| Field | Columns | Description | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SDSS name | 1-24 | SDSS coordinate name, when available. Otherwise, 2000 coordinates with the same column justification. | ||||||||||||||||||||
| SDSS ID | 26-43 | 18-digit SDSS ObjID from DR7. Blank if pair is not within the SDSS DR7 footprint. | ||||||||||||||||||||
| r magnitude 1 | 45-49 | r magnitude of brighter galaxy, from SDSS DR7 if available. | ||||||||||||||||||||
| r magnitude 2 | 51-55 | r magnitude of fainter galaxy, from SDSS DR7 if available. | ||||||||||||||||||||
| z1 | 57-62 | redshift of first object, if known | ||||||||||||||||||||
| obj | 64-66 | identifier for object with z1 - either directional (NSEW and combinations, ctr), fg/bg for foreground and background, or em/abs for blended emission and absorption components. Blank if second galaxy is much fainter. S, SE have different meanings than in "type" field. | ||||||||||||||||||||
| z2 | 69-74 | redshift of second object, when known | ||||||||||||||||||||
| obj | 76-78 | identifier for object with z2, as for z1 | ||||||||||||||||||||
| type | 80-84 | type of pair, as outlined in the paper. Types are
| ||||||||||||||||||||
| dz | 86-87 | contains dz if pair has known Δ z 0.008, blank otherwise | ||||||||||||||||||||
| Cross-IDs | 90-120 | Other object names from common catalogs, or field designations. |
The various pair types are illustrated in these two PNG montages (figures 2a and 2b from the manuscript). There are also PDF files including a single page for each pair, with finding charts, more detailed photometry and identifications, and in some cases more precise redshifts.
| SDSSOverlaps00Final.pdf | 0-10 hours |
| SDSSOverlaps10final.pdf | 10-13 hours |
| SDSSOverlaps13final.pdf | 13-15 hours |
| SDSSOverlaps15final.pdf | 15-24 hours |
There is a similar file of candidate pairs which were rejected for the final list, because of evidence for interaction, other geometric reasons, or for having redshifts the wrong way around for dust backlighting: OverlapRejects.pdf and a matching Javascript catalog for them: http://bama.ua.edu/~ammanning/discard.html
All these PDFs are currently hosted in http://astronomy.ua.edu/keel/observe/PDFcharts
Acknowledgements:
This work was made possible by the contributions of
partcipants in the Galaxy Zo project. The following people contributed to
the discussion thread which first called attention to most of these pairs:
36_degrees, @kim78, Black Cat 77, Carol A, ABZK, aether, Jonathan Aguilar,
aircawn, ajh1971, Luis Aldamiz, AlexandredOr, ALKA, Sylak, Allan Susanna Altherr,
Bjorn Anderson, Andromeda, Anjin, Hanny van Arkel, Marco Armenante, Jessica Arrillaga,
Athanasius, atinahs, averroes38, Michelle Ayers, Branko R. Babic,
Elisabeth Baeten, Elizabeth Bagby, baileymfb, Gary A. Baley, Jonathan K L Barratt,
baswanschers, Luke Batten, BeamMeUp, Denis Beloglazov, benapgar,
G. R. Benavides, Jonathan Bennett, Aida Berges, Adam Berryman, bilbo,
Peter Birren, Black Cat 77, Phil Blackhurst, Kaidian Blade, Blazarman,
bluesam, bmazz, Jakub Bochinski, bonesw05, borillion_star, Thomas Boss,
Benjamin Bottinger, David Bouman, Graham Bowes, S. G. Boyd, Joan Brady,
Beth Brampton, Rebecca Bridge, BriggsyUK, browncow, BrunoBouret,
Amy Bryant, buck123, buffy3kins, BunnyBB, Susan B. Kirschner Burns, Matthew R. Butler,
Angela Butterworth, bv90andy, Peter Cadogan, Colin Caley, Fabiola Capo,
captainklutz1, Caro, Carpi, Dayne Carter, Steve and Alicia Casey, Alexander Cason,
cazzman, ch!l!, Charlotte1975, Bruno Chiaranti, Flaviu Cipcigan, circa24,
cjmaynard, Alan Clark, Michael Clark, Peter Clark, clyde, cmpedp,
codexluminati, Jonathan Cooke, Gary Cooper, Martin Cordoba, Claude Cornen,
Florian Cotte, Gemma Coughlin, Jeff Craik, Devik Crazystar, crlangrick,
Ann Croft, Joseph Crum, crushsion, Jay S. Curtis, Martin Dainton-Smith,
damianm4a1, Dancw39, darkiss, darq8, davidmh, david_nw, Dealylama,
Christina Deaver, dee82, D.B. Dehnel, deivad, Shannon Delaney, delbaeth,
Alex Denney, derek-c, Bill DeRoin, dewey, William A. Dias, Rob Dickens,
dkretz, dlamb, dlevin, dlocksmith, docjuker, draguimov, Mary Drayer,
dshortell, Bryan Duncan, Graham Dungworth, Dupz, Tibor Durgonics,
Henry Durrant, dziakj1, Dale Eason, Dan Eckert, Alan Eggleston,
el-sio, Anna Elizabeth, Mark Elliott, Embyrr922, George Emond,
Britta-Karin Engberg, Epsilon Lyrae, erfar, erratton, ErroneousBee,
Jennifer Evans, Everdine, Trevor Faller, Richard Fannin, fatterman,
Mark Finnegan, Marco Firaux, Firehorse, firejuggler, Carol Fleetwood,
Mark S. Fletcher, flyingant, forensictaz, Norbert Fortelny, Brian Foulkes,
Franzzznl, John J. Freeman, N. Frey, Tony Fussey, galmt, gaMA,
Meagan Rose Gamache, Peter Gardiner, Nathan James Gautrey, Bruce L. Geisert, Derek Geist,
geminiBoi, genel, geofree, Antoine Gibeaux, gilmijar, Tony Ginman,
GmeP, Michael E. Gmirkin, Jose-Maria Gomez-Gomez, Goniners, Bruce R. Gordon,
Alex Gottschalk, Gr8Wings, Laura Granducci-Temple, Steve Gravilla, Patricia Gray,
Greg, Martijn Groeneveld, William R. Guice, Pal Gyoni, Grant Hadlich,
Jakki Hailstone, Alex Hale, Sarah Hall, Stefan Hanafiah, Hand Me The Gun And Ask M,
Briana Harder, Sandy Harris, hbcannon2007, Seppo Heikura, Hans Heilman,
HellyG, heng, Jennifer Hicks, Tina Hickson, David M. Higgins,
Joe Higman, Rei Hiroki, Sandra Hodge, Hoeijmans, Sean Hopkins,
Fred Hopper, Paul Hossfield, hotpotato, Marcella Houweling, E. P. Hubble,
Mary Huckaby, Thomas Huizenga, ickyma, Aldo Ienna, indospurs,
Fabiola Italy, Thomas J, M. Jacek, Jaco9876, Stephen M. Jacoby, Kaveh Jamali,
Valerie James, jayarava, Jazar, jazz.z, jbenisek, jdike,
wee jeemie, jeff_bzh, jelizondo, Jence, Bryan Jenkins, jennyb,
Jennifer Jewell, Zhangwei Jin, jm7, David J. Jones, Liz Jones, Simon Jones,
jordan8er176, Jouke, joulesbeef, julien3d, justinkidd, kamismomma,
Karakara, Karhu, Liz Keenan, Doreen Janette Kelly, kenaye, John Kenny,
Michael Kent, Katherine King, Michael G. Kirk, Sandor Kiss, Alexis Knystautas,
kodusass, Hansjorg Kohler, koivula760, Tsoukalas Konstantinos, George Koprowicz,
Andrey Kravchenko, Dallas Krentzel, Dominik Krzeminski, J. Kuhn, Antoni Kurek,
Lee Labuschagne, Marie-Claude Lacombe, laiky, Warren Lam, Peter Lambart,
Albert Laubi, laura, lautaro, Franck Leclercq, Pascal Lecucq, Brian Legg,
Marcus Lehmann, lemsgate, Derek van Lessen, Liberatus, liliaca,
Mark Lindberg, Wendy Lindboe, Sherry Jamison Ling, Kathleen Littlefield, Diego Llao,
Marc Lluell, Viktor Lofgren, Andrea Lohafer, Ken Lord, Andrea Loughry,
Jay Lowe, lowesox, lpspieler, luigip, Chris Lyle, Alyona Lyovin, Douglas James MacAulay,
Stephen M. MacDonald-Brown, Christine Macmillan, Magister, magsie,
Katie Malone, Steve Malone, malvakai, Meridith Anne Manning, Christian Manteuffel,
marc_fokker, marinakb, Marjorie markmulligan, Patrick Martens,
Ivan Martin, Armen Martirosian, marty, Mauro Marussi, maryneve,
Rick Marzi, Lisa Mauldin, Mark McCallum, A. McGuinness, Susan Bureau McKean,
Emma McKindland, William McNatt, Iain McNaughton, mdamm, Rob Mellor,
menadzer, Mereni, Julien Mergen, MHall, michaelpw, Michele1l, mikezzz1973,
Tomasz Miller, milty456, Elspeth Mitchell, Graham Mitchell, mlg, Moberly,
monsha, Mooney, moonshower, Roberto Moretti, Jonny Morrison, mothball,
mountaineer61, mrgoodwraith, mr_mediocre, mucosa, mudpatty, Charles Mulvey,
Marcus Musselman, Benjamin J Myers, Francesca Myman, Naevdetolk, M. Napieraj,
Narey, Daniel Nash, nativeape, Alex Rodrigo Navarro, nehelenia, Nereid,
NF, Neil van Niekerk, Nightwatch, D. Nijpels, nikaragua, njtm,
Rich Norris, nosebag, Anders Nygaard, Mark O'Connell, C.P. O'Neill, Obsidian,
Okuro Oikawa, oino, Robert Olejarski, John Oliver, Serdar Omer, Letitia Owen,
Linda L. Owen, Paleoc, Peter Palfrey, Palindrom, Graham Panter, Lucas Parham,
Kris J. Parker, Michael Pastorett, Eric R. Pearsall, Robert Pearson, Guido Pecorelli,
Martin Peithner, Nikolaos Peltekis, Guy Cameron Pendlebury, Penyfron, David J. Perks,
Piet Peters, Susan Peters, petershor, M. R. Petrie, Phillips-Laird, Erica Pinto,
Net pirate0, Jo Syan Pitkethly, Marsha G. Pittenger-Bateman, Planraker,
Patricia Platt, Sonny Plourde, J. Podkowinski, Sian Podmore, Kevin Poehlmann,
pandora poh, Pookah, Carol Pratt, Brian Price, Adam Primus, little prince,
Richard Proctor, Carlos Brulio Quintanilha, raginpagan, randallk, RandyC,
ratwod, RcS, Far Realm, Mark Redgwell, rem1, retrogamer, rezetor, rhodesong,
Rhys, Paola Riccucci, rikmono, rinscewind, Rixter223, john roach, Holden Robbins,
Grant Alan Rogers, Paul Rogers, Leslie Boudreaux Romero, Ronbo, Kees Roovers,
Geoff Roynon, Jeremy Rozen, Michel Rudelle, Fabian Runkel, Paul Rutten,
saganrocks, Rolf Sara, sarahfis, sayonave08, scarlett, Nicole Schmidt, scientifically_inclined,
Bret Sears, Alexander Sergeev, Hermes Sevilla, Gwen E. Shafer, Richard R.W. Shafer,
Eric Shafto, Alice Sheppard, Liaoshan Shi, Greg Shipley, Patrick Shotlander, Elizabeth Siegel,
Nanne Sierkstra, Sika, Simplex0, singinghedgehog, sirbob, sixthskinjob,
SKH86, skyhunter, slimeslayer, smeagol69, Schuyler Smith, smokytodd,
Solarsonja, Richard Solensky, Nancy Sondow, spiralmania, stargeezer, starry_nite,
Star_Badge, stecla, Heather Steed, Nathaniel Stein, Andres Guillermo Stenner,
steph, Ralf W. Stephan, StephenT, John H. Stewart, stex, Martin Strahilovski,
Jason M. Straight, Andrew Strassman, STS301, subscriber, Piotr Sukiennik,
Uda Sumbar, suneater, Carl J Swanson, Michele Sweeney, Rita Szilagyi,
Fernanda Takafuji, Nidhi Tandon, Jean Tate, Olmo Taurog, Taylor,
tcreg, Olivier Termolle, Terriberri, tessa, the ecliptic, thingy,
Donald Thomas, Damon Throop, tibinou, Alan Tidy, Allan Tierney, tigger-t,
Kresimir Tisanic, TitaniumDragon, Ana Tomaic, Gheorghe Tomescu, tonyaac,
Daniel Tossato, Jay Treiman, Dave Tremblay, tsiehta, Carol Tye, ubberfish1,
Henry Unsworth-Prentice, K. Uyanik, vaevictus, vaga52, Anne-Marie Vaillancourt,
Michael Vain, Mukund Vedapudi, veggy, Marcel Veillette, volare09,
Peter Walker, Steve Walker, watchingthesky, wbeaty, Randy Weekley, Stefan Uwe Weniger,
Caroline Whittaker, wiggin81, Julia Wilkinson, Deanna Williams, Gwydion Madawc Williams,
Robert Williams, will_e_web, Jennelle Wilson, Jan Witowski, Wolfhart,
Brad Woodfield, Jack Wright, Layne L. Wright, David G. Yates, Helina Ylisirnio,
yobar23, Markus Zajac, ZappyBBC, zeno, Zeus2007, Zolin, Agnieszka Zuk, Zwielicht, and
Magdalena Zych.