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. Crnojević; B. Mutlu-Pakdıl; A. K. Vivas; A. B. Pace; J. L. Carlin; M. L.M. Collins; P. S. Ferguson; D. Martínez-Delgado; C. E. Martínez-Vázquez; 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-Fernández; R. Miquel; M. E.S. Pereira; A. Pieres; A. A.Plazas Malagón; 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

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. Crnojević, B. Mutlu-Pakdıl, A. K. Vivas, A. B. Pace, J. L. Carlin, M. L.M. Collins, P. S. Ferguson, D. Martínez-Delgado, C. E. Martínez-Vázquez, 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-Fernández, R. Miquel, M. E.S. Pereira, A. Pieres, A. A.Plazas Malagón, 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

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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
Journal	Astrophysical Journal
Volume	961
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/ad07d0
State	Published - Jan 1 2024

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McNanna, M., Bechtol, K., Mau, S., Nadler, E. O., Medoff, J., Drlica-Wagner, A., Cerny, W., Crnojević, D., Mutlu-Pakdıl, B., Vivas, A. K., Pace, A. B., Carlin, J. L., Collins, M. L. M., Ferguson, P. S., Martínez-Delgado, D., Martínez-Vázquez, C. E., Noel, N. E. D., Riley, A. H., Sand, D. J., ... Wiseman, P. (2024). A Search for Faint Resolved Galaxies Beyond the Milky Way in DES Year 6: A New Faint, Diffuse Dwarf Satellite of NGC 55. Astrophysical Journal, 961(1), Article 126. https://doi.org/10.3847/1538-4357/ad07d0

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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.",

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. Crnojevi{\'c} and B. Mutlu-Pakdıl and Vivas, {A. K.} and Pace, {A. B.} and Carlin, {J. L.} and Collins, {M. L.M.} and Ferguson, {P. S.} and D. Mart{\'i}nez-Delgado and Mart{\'i}nez-V{\'a}zquez, {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-Fern{\'a}ndez and R. Miquel and Pereira, {M. E.S.} and A. Pieres and Malag{\'o}n, {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",

note = "Publisher Copyright: {\textcopyright} 2024. The Author(s). Published by the American Astronomical Society.",

year = "2024",

month = jan,

day = "1",

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

language = "English",

volume = "961",

journal = "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, Crnojević, D, Mutlu-Pakdıl, B, Vivas, AK, Pace, AB, Carlin, JL, Collins, MLM, Ferguson, PS, Martínez-Delgado, D, Martínez-Vázquez, 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-Fernández, J, Miquel, R, Pereira, MES, Pieres, A, Malagón, 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 2024, 'A Search for Faint Resolved Galaxies Beyond the Milky Way in DES Year 6: A New Faint, Diffuse Dwarf Satellite of NGC 55', Astrophysical Journal, vol. 961, no. 1, 126. 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 - Crnojević, D.

AU - Mutlu-Pakdıl, B.

AU - Vivas, A. K.

AU - Pace, A. B.

AU - Carlin, J. L.

AU - Collins, M. L.M.

AU - Ferguson, P. S.

AU - Martínez-Delgado, D.

AU - Martínez-Vázquez, 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-Fernández, J.

AU - Miquel, R.

AU - Pereira, M. E.S.

AU - Pieres, A.

AU - Malagón, 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.

PY - 2024/1/1

Y1 - 2024/1/1

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.

UR - http://www.scopus.com/inward/record.url?scp=85182798197&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/ad07d0

DO - 10.3847/1538-4357/ad07d0

M3 - Article

AN - SCOPUS:85182798197

SN - 0004-637X

VL - 961

JO - Astrophysical Journal

JF - 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

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