NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-24 T09:14:50 PDT
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For refcode 2018ApJ...868...96C:
Retrieve 4 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
2018ApJ...868...96C The Dragonfly Nearby Galaxies Survey. V. HST/ACS Observations of 23 Low Surface Brightness Objects in the Fields of NGC 1052, NGC 1084, M96, and NGC 4258 Cohen, Yotam; van Dokkum, Pieter; Danieli, Shany; Romanowsky, Aaron J.; Abraham, Roberto; Merritt, Allison; Zhang, Jielai; Mowla, Lamiya; Kruijssen, J. M. Diederik; Conroy, Charlie; Wasserman, Asher Abstract. We present Hubble Space Telescope/Advanced Camera for Surveys (ACS) imaging of 23 very low surface brightness (mu_ e,V_ ~ 25-27.5) galaxies detected in the fields of four nearby galaxy groups. These objects were selected from deep optical imaging obtained with the Dragonfly Telephoto Array. Seven are newly identified, while most of the others had been seen previously in visual surveys of deep photographic plates and more recent surveys. Few have previously been studied in detail. From the ACS images, we measure distances to the galaxies using both the tip of the red giant branch method and the surface brightness fluctuations method. We demonstrate that the two methods are consistent with each other in the regime where both can be applied. The distances to 15 out of 20 galaxies with stable measurements are consistent with that of the targeted group within errors. This suggests that assuming group membership based solely on projected proximity is ~75% successful in this regime. The galaxies are nearly round, with a median axis ratio of 0.85, and visually resemble dwarf spheroidal galaxies. The objects have a range of sizes, from R_ e_ = 0.4 kpc to R_ e_ = 1.8 kpc, with a median < {R}_e_> =1.0 {kpc}. They range in luminosity from M_ V_ = -11.4 to M_ V_ = -15.6, with a median < {M}_V_> =-12.4. Galaxies with R_ e_ ~ 1 kpc and M_ V_ ~ -12 are fairly rare in the Local Group, but we find many of them in this relatively small sample. Four of the objects fall in the class of ultra-diffuse galaxies, with R_ e_ > 1.5 kpc and mu_0,V_ > 24 mag arcsec^-2^, including the recently identified dark matter deficient galaxy NGC 1052-DF2. Key words: galaxies: distances and redshifts, galaxies: dwarf, galaxies: groups: general, galaxies: photometry
Retrieve 4 NED objects in this reference.
Please click here for ADS abstract

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