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The Halos and Environments of Nearby Galaxies (HERON) I: Imaging, Sample Characteristics, and Envelope Diameters

Rich, R Michael, Mosenkov, Aleksandr, Lee-Saunders, Henry, Koch, Andreas, Kormendy, John, Kennefick, Julia, Brosch, Noah, Sales, Laura, Bullock, James, Burkert, Andreas , Collins, Michelle, Cooper, Michael, Fusco, Michael, Reitzel, David, Thilker, David, Milewski, Dave G, Elias, Lydia, Saade, M L and De Groot, Laura (2019) The Halos and Environments of Nearby Galaxies (HERON) I: Imaging, Sample Characteristics, and Envelope Diameters Monthly Notices of the Royal Astronomical Society.

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We use a dedicated 0.7-m telescope to image the halos of 119 galaxies in the Local Volume to μr ∼ 28 − 30 mag/arcsec2. The sample is primarily from the 2MASS Large Galaxy Atlas and extended to include nearby dwarf galaxies and more distant giant ellipticals, and spans fully the galaxy colour{magnitude diagram including the blue cloud and red sequence. We present an initial overview, including deep images of our galaxies. Our observations reproduce previously reported low surface brightness structures, including extended plumes in M51, and a newly discovered tidally extended dwarf galaxy in NGC7331. Low surface brightness structures, or "envelopes", exceeding 50 kpc in diameter are found mostly in galaxies with MV < -20:5, and classic interaction signatures are infrequent. Defining a halo diameter at the surface brightness 28 mag/arcsec2, we �find that halo diameter is correlated with total galaxy luminosity. Extended signatures of interaction are found throughout the galaxy colour{magnitude diagram without preference for the red or blue sequences, or the green valley. Large envelopes may be found throughout the colour{magnitude diagram with some preference for the bright end of the red sequence. Spiral and S0 galaxies have broadly similar sizes, but ellipticals extend to notably greater diameters, reaching 150 kpc. We propose that the extended envelopes of disk galaxies are dominated by an extension of the disk population rather than by a classical population II halo.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Rich, R Michael
Mosenkov, Aleksandr
Lee-Saunders, Henry
Koch, Andreas
Kormendy, John
Kennefick, Julia
Brosch, Noah
Sales, Laura
Bullock, James
Burkert, Andreas
Cooper, Michael
Fusco, Michael
Reitzel, David
Thilker, David
Milewski, Dave G
Elias, Lydia
Saade, M L
De Groot, Laura
Date : 1 August 2019
DOI : 10.1093/mnras/stz2106
Copyright Disclaimer : This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: Author(s)Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords : Galaxies; Evolution - formation - halos - interactions - photometry - structure
Depositing User : Diane Maxfield
Date Deposited : 17 Sep 2019 11:53
Last Modified : 17 Sep 2019 11:53

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