| Téléchargement | - Voir la version finale : PEARLS: a potentially isolated quiescent dwarf galaxy with a tip of the red giant branch distance of 30 Mpc (PDF, 6.0 Mio)
|
|---|
| DOI | Trouver le DOI : https://doi.org/10.3847/2041-8213/ad1b56 |
|---|
| Auteur | Rechercher : Carleton, TimothyIdentifiant ORCID : https://orcid.org/0000-0001-6650-2853; Rechercher : Ellsworth-Bowers, TimothyIdentifiant ORCID : https://orcid.org/0000-0001-5695-7002; Rechercher : Windhorst, Rogier A.Identifiant ORCID : https://orcid.org/0000-0001-8156-6281; Rechercher : Cohen, Seth H.Identifiant ORCID : https://orcid.org/0000-0003-3329-1337; Rechercher : Conselice, Christopher J.Identifiant ORCID : https://orcid.org/0000-0003-1949-7638; Rechercher : Diego, Jose M.Identifiant ORCID : https://orcid.org/0000-0001-9065-3926; Rechercher : Zitrin, AdiIdentifiant ORCID : https://orcid.org/0000-0002-0350-4488; Rechercher : Archer, Haylee N.Identifiant ORCID : https://orcid.org/0000-0002-8449-4815; Rechercher : McIntyre, IsabelIdentifiant ORCID : https://orcid.org/0000-0003-0230-6153; Rechercher : Kamieneski, PatrickIdentifiant ORCID : https://orcid.org/0000-0001-9394-6732; Rechercher : Jansen, Rolf A.Identifiant ORCID : https://orcid.org/0000-0003-1268-5230; Rechercher : Summers, JakeIdentifiant ORCID : https://orcid.org/0000-0002-7265-7920; Rechercher : D’Silva, Jordan C. J.Identifiant ORCID : https://orcid.org/0000-0002-9816-1931; Rechercher : Koekemoer, Anton M.Identifiant ORCID : https://orcid.org/0000-0002-6610-2048; Rechercher : Coe, DanIdentifiant ORCID : https://orcid.org/0000-0001-7410-7669; Rechercher : Driver, Simon P.Identifiant ORCID : https://orcid.org/0000-0001-9491-7327; Rechercher : Frye, BrendaIdentifiant ORCID : https://orcid.org/0000-0003-1625-8009; Rechercher : Grogin, Norman A.Identifiant ORCID : https://orcid.org/0000-0001-9440-8872; Rechercher : Marshall, Madeline A.1Identifiant ORCID : https://orcid.org/0000-0001-6434-7845; Rechercher : Nonino, MarioIdentifiant ORCID : https://orcid.org/0000-0001-6342-9662; Rechercher : Pirzkal, NorIdentifiant ORCID : https://orcid.org/0000-0003-3382-5941; Rechercher : Robotham, AaronIdentifiant ORCID : https://orcid.org/0000-0003-0429-3579; Rechercher : Ryan, Russell E.Identifiant ORCID : https://orcid.org/0000-0003-0894-1588; Rechercher : Ortiz, RafaelIdentifiant ORCID : https://orcid.org/0000-0002-6150-833X; Rechercher : Tompkins, ScottIdentifiant ORCID : https://orcid.org/0000-0001-9052-9837; Rechercher : Willmer, Christopher N. A.Identifiant ORCID : https://orcid.org/0000-0001-9262-9997; Rechercher : Yan, HaojingIdentifiant ORCID : https://orcid.org/0000-0001-7592-7714; Rechercher : Holwerda, Benne W.Identifiant ORCID : https://orcid.org/0000-0002-4884-6756 |
|---|
| Affiliation | - Conseil national de recherches Canada. Herzberg en astronomie et en astrophysique
|
|---|
| Bailleur de fonds | Rechercher : Space Telescope Science Institute |
|---|
| Format | Texte, Article |
|---|
| Sujet | dwarf galaxies; dark matter; stellar mass; low surface brightness galaxies; James Webb space telescope; stellar populations; galaxy evolution |
|---|
| Résumé | A wealth of observations have long suggested that the vast majority of isolated classical dwarf galaxies (M∗ = 10⁷–10⁹ M⊙) are currently star forming. However, recent observations of the large abundance of "ultra-diffuse galaxies" beyond the reach of previous large spectroscopic surveys suggest that our understanding of the dwarf galaxy population may be incomplete. Here we report the serendipitous discovery of an isolated quiescent dwarf galaxy in the nearby Universe, which was imaged as part of the JWST PEARLS Guaranteed Time Observation program. Remarkably, individual red-giant branch stars are visible in this near-IR imaging, suggesting a distance of 30 ± 4 Mpc, and a wealth of archival photometry point to an sSFR of 2 × 10⁻¹¹ yr⁻¹ and star formation rate of 4 × 10⁻⁴ M⊙ yr⁻¹. Spectra obtained with the Lowell Discovery Telescope find a recessional velocity consistent with the Hubble Flow and >1500 km s⁻¹ separated from the nearest massive galaxy in Sloan Digital Sky Survey suggesting that this galaxy was either quenched from internal mechanisms or had a very high-velocity (≳1000 km s⁻¹) interaction with a nearby massive galaxy in the past. This analysis highlights the possibility that many nearby quiescent dwarf galaxies are waiting to be discovered and that JWST has the potential to resolve them. |
|---|
| Date de publication | 2024-02-01 |
|---|
| Maison d’édition | American Astronomical Society |
|---|
| Licence | |
|---|
| Dans | |
|---|
| Langue | anglais |
|---|
| Publications évaluées par des pairs | Oui |
|---|
| Exporter la notice | Exporter en format RIS |
|---|
| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
|---|
| Identificateur de l’enregistrement | 9b0e6710-d184-4db3-84d2-b8f428340397 |
|---|
| Enregistrement créé | 2024-07-10 |
|---|
| Enregistrement modifié | 2024-07-12 |
|---|
