Galaxy Zoo Talk

Automatic detection and quantitative assessment of peculiar galaxy pairs in Sloan Digital Sky Survey arXiv:1407.5000

  • c_cld by c_cld

    http://arxiv.org/abs/1407.5000

    Lior Shamir, John Wallin

    (Submitted on 18 Jul 2014)

    We applied computational tools for automatic detection of peculiar galaxy pairs. We first detected in SDSS DR7 ~400,000 galaxy images with i magnitude 18 that had more than one point spread function, and then applied a machine learning algorithm that detected ~26,000 galaxy images that had morphology similar to the morphology of galaxy mergers. That dataset was mined using a novelty detection algorithm, producing a short list of 500 most peculiar galaxies as quantitatively determined by the algorithm. Manual examination of these galaxies showed that while most of the galaxy pairs in the list were not necessarily peculiar, numerous unusual galaxy pairs were detected. In this paper we describe the protocol and computational tools used >for the detection of peculiar mergers, and provide examples of peculiar galaxy pairs that were detected.

    reviewer, William Keel

    Cross-match with http://www.galaxyzoo.org.s3.amazonaws.com/subjects/standard/123.....jpg base

    SDSS No. objID ra dec

    587727230522097827 5 1237670956251414712 24.57851219 -9.537619453

    1237670956251414712 Tidally distorted interacting pair

    587739156573585582 10 1237665098996777103 133.7303775 24.57973318

    1237665098996777103 Tidally distorted interacting pair

    587744875857642337 13 1237667782806340479 118.4024586 9.395987378

    1237667782806340479 Tidally distorted interacting pair

    587733434070860127 40 1237661387085250942 254.7192728 28.3019631

    1237661387085250942 Red with star

    587724232110440585 42 1237653651311952031 32.64715995 12.9182263

    1237653651311952031 Merging pair

    587729653430222900 44 1237655473976181440 261.0982963 25.60859596

    1237655473976181440 Single arm spiral and companion

    587740522398089357 47 1237678578758517009 8.896980414 23.76796253

    1237678578758517009 Close interacting pair with tidal distortions

    587011219678527613 50 1237655465926721667 229.9230265 54.82465216

    1237655465926721667 Close pair

    587740552454340671 52 1237664089137676332 54.6957984 15.54806413

    1237664089137676332 Close pair

    587724232104280165 53 1237666089514434782 18.14808384 14.01248149

    1237666089514434782 Close group of three galaxies

    587742863676473541 54 1237668623548022885 181.802408 16.96935067

    1237668623548022885 Possible superposition?

    Posted

  • c_cld by c_cld

    Hope we'll get in near future an improved search capability with SDSS Id / GZ id in both ways?

    Posted

  • c_cld by c_cld

    AGZ00020nh

    1237657220410769516 ; no 19 in arXiv:1407.5000

    1237657220410769516

    Close pair of spirals - some evidence of tidal distortion
    UGC 05615/VV 312/CGCG 1020.6+5321

    Posted

  • c_cld by c_cld

    no 2 in arXiv:1407.5000 587730023866761221 1237662262172778590

    Tidally distorted interacting pair [RC2] A1488+07B/CGCG 048-028N

    AGZ0002c8j

    enter image description here

    AGZ0002c8i

    enter image description here

    AGZ0006hsq

    1237662262172778590 flipped

    Posted

  • c_cld by c_cld

    AGZ0002b5v

    no 17 in arXiv:1407.5000 587298664650145819 1237661435921629215

    1237661435921629215

    A strongly interacting pair of disk galaxies #NGC 4837 / I Zw 046

    Posted