A search for faint resolved galaxies beyond the Milky Way in DES year 6: a new faint, diffuse Dwarf Satellite of NGC 55

M. McNanna; K. Bechtol; S. Mau; E. O. Nadler; J. Medoff; A. Drlica-Wagner; W. Cerny; D. Crnojevic; B. Mutlu-Pakdil; A. K. Vivas; A. B. Pace; J. L. Carlin; M. L. M. Collins; P. S. Ferguson; D. Martinez-Delgado; C. E. Martinez-Vazquez; N. E. D. Noel; A. H. Riley; D. J. Sand; A. Smercina; E. Tollerud; R. H. Wechsler; T. M. C. Abbott; M. Aguena; O. Alves; D. Bacon; C. R. Bom; D. Brooks; D. L. Burke; J. A. Carballo-Bello; A. Carnero Rosell; J. Carretero; L. N. da Costa; T. M. Davis; J. De Vicente; H. T. Diehl; P. Doel; I Ferrero; J. Frieman; G. Giannini; D. Gruen; G. Gutierrez; R. A. Gruendl; S. R. Hinton; D. L. Hollowood; K. Honscheid; D. J. James; K. Kuehn; J. L. Marshall; J. Mena-Fernandez; R. Miquel; M. E. S. Pereira; A. Pieres; A. A. Plazas Malagon; J. D. Sakowska; E. Sanchez; D. Sanchez Cid; B. Santiago; I. Sevilla-Noarbe; M. Smith; G. S. Stringfellow; E. Suchyta; M. E. C. Swanson; G. Tarle; N. Weaverdyck; P. Wiseman; DES & DELVE Collaboration

doi:10.3847/1538-4357/ad07d0

A search for faint resolved galaxies beyond the Milky Way in DES year 6: a new faint, diffuse Dwarf Satellite of NGC 55

M. McNanna, K. Bechtol, S. Mau, E. O. Nadler, J. Medoff, A. Drlica-Wagner, W. Cerny, D. Crnojevic, B. Mutlu-Pakdil, A. K. Vivas, A. B. Pace, J. L. Carlin, M. L. M. Collins, P. S. Ferguson, D. Martinez-Delgado, C. E. Martinez-Vazquez, N. E. D. Noel, A. H. Riley, D. J. Sand, A. SmercinaE. Tollerud, R. H. Wechsler, T. M. C. Abbott, M. Aguena, O. Alves, D. Bacon, C. R. Bom, D. Brooks, D. L. Burke, J. A. Carballo-Bello, A. Carnero Rosell, J. Carretero, L. N. da Costa, T. M. Davis, J. De Vicente, H. T. Diehl, P. Doel, I Ferrero, J. Frieman, G. Giannini, D. Gruen, G. Gutierrez, R. A. Gruendl, S. R. Hinton, D. L. Hollowood, K. Honscheid, D. J. James, K. Kuehn, J. L. Marshall, J. Mena-Fernandez, R. Miquel, M. E. S. Pereira, A. Pieres, A. A. Plazas Malagon, J. D. Sakowska, E. Sanchez, D. Sanchez Cid, B. Santiago, I. Sevilla-Noarbe, M. Smith, G. S. Stringfellow, E. Suchyta, M. E. C. Swanson, G. Tarle, N. Weaverdyck, P. Wiseman, DES & DELVE Collaboration

Australian Astronomical Optics

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Abstract

We report results from a systematic wide-area search for faint dwarf galaxies at heliocentric distances from 0.3 to 2 Mpc using the full 6 yr of data from the Dark Energy Survey (DES). Unlike previous searches over the DES data, this search specifically targeted a field population of faint galaxies located beyond the Milky Way virial radius. We derive our detection efficiency for faint, resolved dwarf galaxies in the Local Volume with a set of synthetic galaxies and expect our search to be complete to M _V ∼ (−7, −10) mag for galaxies at D = (0.3, 2.0) Mpc. We find no new field dwarfs in the DES footprint, but we report the discovery of one high-significance candidate dwarf galaxy at a distance of 2.2 _−0.12 ^+0.05 Mpc , a potential satellite of the Local Volume galaxy NGC 55, separated by 47′ (physical separation as small as 30 kpc). We estimate this dwarf galaxy to have an absolute V-band magnitude of − 8.0_−0.3^+0.5 mag and an azimuthally averaged physical half-light radius of 2.2_−0.4^+0.5 kpc , making this one of the lowest surface brightness galaxies ever found with μ = 32.3 mag arcsec − 2 . This is the largest, most diffuse galaxy known at this luminosity, suggesting possible tidal interactions with its host.

Original language	English
Article number	126
Pages (from-to)	1-17
Number of pages	17
Journal	The Astrophysical Journal
Volume	961
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/ad07d0
Publication status	Published - 20 Jan 2024

Bibliographical note

Copyright the Author(s) 2024. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

space-telescope observations
local volume
dark-matter
data release
luminosity function
too big
magellanic clouds
globular-cluster
stellar-systems
mass function

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Publisher version (open access)Final published version, 2.41 MBLicence: CC BY

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McNanna, M., Bechtol, K., Mau, S., Nadler, E. O., Medoff, J., Drlica-Wagner, A., Cerny, W., Crnojevic, D., Mutlu-Pakdil, B., Vivas, A. K., Pace, A. B., Carlin, J. L., Collins, M. L. M., Ferguson, P. S., Martinez-Delgado, D., Martinez-Vazquez, C. E., Noel, N. E. D., Riley, A. H., Sand, D. J., ... DES & DELVE Collaboration (2024). A search for faint resolved galaxies beyond the Milky Way in DES year 6: a new faint, diffuse Dwarf Satellite of NGC 55. The Astrophysical Journal, 961(1), 1-17. Article 126. https://doi.org/10.3847/1538-4357/ad07d0

@article{8cd684e93a404070bfb2fbbb3f77d6db,

title = "A search for faint resolved galaxies beyond the Milky Way in DES year 6: a new faint, diffuse Dwarf Satellite of NGC 55",

abstract = "We report results from a systematic wide-area search for faint dwarf galaxies at heliocentric distances from 0.3 to 2 Mpc using the full 6 yr of data from the Dark Energy Survey (DES). Unlike previous searches over the DES data, this search specifically targeted a field population of faint galaxies located beyond the Milky Way virial radius. We derive our detection efficiency for faint, resolved dwarf galaxies in the Local Volume with a set of synthetic galaxies and expect our search to be complete to M V ∼ (−7, −10) mag for galaxies at D = (0.3, 2.0) Mpc. We find no new field dwarfs in the DES footprint, but we report the discovery of one high-significance candidate dwarf galaxy at a distance of 2.2 −0.12 +0.05 Mpc , a potential satellite of the Local Volume galaxy NGC 55, separated by 47′ (physical separation as small as 30 kpc). We estimate this dwarf galaxy to have an absolute V-band magnitude of − 8.0−0.3+0.5 mag and an azimuthally averaged physical half-light radius of 2.2−0.4+0.5 kpc , making this one of the lowest surface brightness galaxies ever found with μ = 32.3 mag arcsec − 2 . This is the largest, most diffuse galaxy known at this luminosity, suggesting possible tidal interactions with its host.",

keywords = "space-telescope observations, local volume, dark-matter, data release, luminosity function, too big, magellanic clouds, globular-cluster, stellar-systems, mass function",

author = "M. McNanna and K. Bechtol and S. Mau and Nadler, \{E. O.\} and J. Medoff and A. Drlica-Wagner and W. Cerny and D. Crnojevic and B. Mutlu-Pakdil and Vivas, \{A. K.\} and Pace, \{A. B.\} and Carlin, \{J. L.\} and Collins, \{M. L. M.\} and Ferguson, \{P. S.\} and D. Martinez-Delgado and Martinez-Vazquez, \{C. E.\} and Noel, \{N. E. D.\} and Riley, \{A. H.\} and Sand, \{D. J.\} and A. Smercina and E. Tollerud and Wechsler, \{R. H.\} and Abbott, \{T. M. C.\} and M. Aguena and O. Alves and D. Bacon and Bom, \{C. R.\} and D. Brooks and Burke, \{D. L.\} and Carballo-Bello, \{J. A.\} and \{Carnero Rosell\}, A. and J. Carretero and \{da Costa\}, \{L. N.\} and Davis, \{T. M.\} and \{De Vicente\}, J. and Diehl, \{H. T.\} and P. Doel and I Ferrero and J. Frieman and G. Giannini and D. Gruen and G. Gutierrez and Gruendl, \{R. A.\} and Hinton, \{S. R.\} and Hollowood, \{D. L.\} and K. Honscheid and James, \{D. J.\} and K. Kuehn and Marshall, \{J. L.\} and J. Mena-Fernandez and R. Miquel and Pereira, \{M. E. S.\} and A. Pieres and Malagon, \{A. A. Plazas\} and Sakowska, \{J. D.\} and E. Sanchez and \{Sanchez Cid\}, D. and B. Santiago and I. Sevilla-Noarbe and M. Smith and Stringfellow, \{G. S.\} and E. Suchyta and Swanson, \{M. E. C.\} and G. Tarle and N. Weaverdyck and P. Wiseman and \{DES \& DELVE Collaboration\}",

note = "Copyright the Author(s) 2024. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.",

year = "2024",

month = jan,

day = "20",

doi = "10.3847/1538-4357/ad07d0",

language = "English",

volume = "961",

pages = "1--17",

journal = "The Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1",

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McNanna, M, Bechtol, K, Mau, S, Nadler, EO, Medoff, J, Drlica-Wagner, A, Cerny, W, Crnojevic, D, Mutlu-Pakdil, B, Vivas, AK, Pace, AB, Carlin, JL, Collins, MLM, Ferguson, PS, Martinez-Delgado, D, Martinez-Vazquez, CE, Noel, NED, Riley, AH, Sand, DJ, Smercina, A, Tollerud, E, Wechsler, RH, Abbott, TMC, Aguena, M, Alves, O, Bacon, D, Bom, CR, Brooks, D, Burke, DL, Carballo-Bello, JA, Carnero Rosell, A, Carretero, J, da Costa, LN, Davis, TM, De Vicente, J, Diehl, HT, Doel, P, Ferrero, I, Frieman, J, Giannini, G, Gruen, D, Gutierrez, G, Gruendl, RA, Hinton, SR, Hollowood, DL, Honscheid, K, James, DJ, Kuehn, K, Marshall, JL, Mena-Fernandez, J, Miquel, R, Pereira, MES, Pieres, A, Malagon, AAP, Sakowska, JD, Sanchez, E, Sanchez Cid, D, Santiago, B, Sevilla-Noarbe, I, Smith, M, Stringfellow, GS, Suchyta, E, Swanson, MEC, Tarle, G, Weaverdyck, N, Wiseman, P & DES & DELVE Collaboration 2024, 'A search for faint resolved galaxies beyond the Milky Way in DES year 6: a new faint, diffuse Dwarf Satellite of NGC 55', The Astrophysical Journal, vol. 961, no. 1, 126, pp. 1-17. https://doi.org/10.3847/1538-4357/ad07d0

TY - JOUR

T1 - A search for faint resolved galaxies beyond the Milky Way in DES year 6

T2 - a new faint, diffuse Dwarf Satellite of NGC 55

AU - McNanna, M.

AU - Bechtol, K.

AU - Mau, S.

AU - Nadler, E. O.

AU - Medoff, J.

AU - Drlica-Wagner, A.

AU - Cerny, W.

AU - Crnojevic, D.

AU - Mutlu-Pakdil, B.

AU - Vivas, A. K.

AU - Pace, A. B.

AU - Carlin, J. L.

AU - Collins, M. L. M.

AU - Ferguson, P. S.

AU - Martinez-Delgado, D.

AU - Martinez-Vazquez, C. E.

AU - Noel, N. E. D.

AU - Riley, A. H.

AU - Sand, D. J.

AU - Smercina, A.

AU - Tollerud, E.

AU - Wechsler, R. H.

AU - Abbott, T. M. C.

AU - Aguena, M.

AU - Alves, O.

AU - Bacon, D.

AU - Bom, C. R.

AU - Brooks, D.

AU - Burke, D. L.

AU - Carballo-Bello, J. A.

AU - Carnero Rosell, A.

AU - Carretero, J.

AU - da Costa, L. N.

AU - Davis, T. M.

AU - De Vicente, J.

AU - Diehl, H. T.

AU - Doel, P.

AU - Ferrero, I

AU - Frieman, J.

AU - Giannini, G.

AU - Gruen, D.

AU - Gutierrez, G.

AU - Gruendl, R. A.

AU - Hinton, S. R.

AU - Hollowood, D. L.

AU - Honscheid, K.

AU - James, D. J.

AU - Kuehn, K.

AU - Marshall, J. L.

AU - Mena-Fernandez, J.

AU - Miquel, R.

AU - Pereira, M. E. S.

AU - Pieres, A.

AU - Malagon, A. A. Plazas

AU - Sakowska, J. D.

AU - Sanchez, E.

AU - Sanchez Cid, D.

AU - Santiago, B.

AU - Sevilla-Noarbe, I.

AU - Smith, M.

AU - Stringfellow, G. S.

AU - Suchyta, E.

AU - Swanson, M. E. C.

AU - Tarle, G.

AU - Weaverdyck, N.

AU - Wiseman, P.

AU - DES & DELVE Collaboration

N1 - Copyright the Author(s) 2024. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

PY - 2024/1/20

Y1 - 2024/1/20

N2 - We report results from a systematic wide-area search for faint dwarf galaxies at heliocentric distances from 0.3 to 2 Mpc using the full 6 yr of data from the Dark Energy Survey (DES). Unlike previous searches over the DES data, this search specifically targeted a field population of faint galaxies located beyond the Milky Way virial radius. We derive our detection efficiency for faint, resolved dwarf galaxies in the Local Volume with a set of synthetic galaxies and expect our search to be complete to M V ∼ (−7, −10) mag for galaxies at D = (0.3, 2.0) Mpc. We find no new field dwarfs in the DES footprint, but we report the discovery of one high-significance candidate dwarf galaxy at a distance of 2.2 −0.12 +0.05 Mpc , a potential satellite of the Local Volume galaxy NGC 55, separated by 47′ (physical separation as small as 30 kpc). We estimate this dwarf galaxy to have an absolute V-band magnitude of − 8.0−0.3+0.5 mag and an azimuthally averaged physical half-light radius of 2.2−0.4+0.5 kpc , making this one of the lowest surface brightness galaxies ever found with μ = 32.3 mag arcsec − 2 . This is the largest, most diffuse galaxy known at this luminosity, suggesting possible tidal interactions with its host.

AB - We report results from a systematic wide-area search for faint dwarf galaxies at heliocentric distances from 0.3 to 2 Mpc using the full 6 yr of data from the Dark Energy Survey (DES). Unlike previous searches over the DES data, this search specifically targeted a field population of faint galaxies located beyond the Milky Way virial radius. We derive our detection efficiency for faint, resolved dwarf galaxies in the Local Volume with a set of synthetic galaxies and expect our search to be complete to M V ∼ (−7, −10) mag for galaxies at D = (0.3, 2.0) Mpc. We find no new field dwarfs in the DES footprint, but we report the discovery of one high-significance candidate dwarf galaxy at a distance of 2.2 −0.12 +0.05 Mpc , a potential satellite of the Local Volume galaxy NGC 55, separated by 47′ (physical separation as small as 30 kpc). We estimate this dwarf galaxy to have an absolute V-band magnitude of − 8.0−0.3+0.5 mag and an azimuthally averaged physical half-light radius of 2.2−0.4+0.5 kpc , making this one of the lowest surface brightness galaxies ever found with μ = 32.3 mag arcsec − 2 . This is the largest, most diffuse galaxy known at this luminosity, suggesting possible tidal interactions with its host.

KW - space-telescope observations

KW - local volume

KW - dark-matter

KW - data release

KW - luminosity function

KW - too big

KW - magellanic clouds

KW - globular-cluster

KW - stellar-systems

KW - mass function

UR - https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=mq-pure-production&SrcAuth=WosAPI&KeyUT=WOS:001144242200001&DestLinkType=FullRecord&DestApp=WOS_CPL

UR - https://www.scopus.com/pages/publications/85182798197

U2 - 10.3847/1538-4357/ad07d0

DO - 10.3847/1538-4357/ad07d0

M3 - Article

SN - 0004-637X

VL - 961

SP - 1

EP - 17

JO - The Astrophysical Journal

JF - The Astrophysical Journal

IS - 1

M1 - 126

ER -

A search for faint resolved galaxies beyond the Milky Way in DES year 6: a new faint, diffuse Dwarf Satellite of NGC 55

Abstract

Bibliographical note

Keywords

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