A Nascent Tidal Dwarf Galaxy Forming within the Northern Hi Streamer of M82

Imad Pasha; Deborah Lokhorst; Pieter G. Van Dokkum; Seery Chen; Roberto Abraham; Johnny Greco; Shany Danieli; Tim Miller; Erin Lippitt; Ava Polzin; Zili Shen; Michael A. Keim; Qing Liu; Allison Merritt; Jielai Zhang

doi:10.3847/2041-8213/ac3ca6

A Nascent Tidal Dwarf Galaxy Forming within the Northern Hi Streamer of M82

Imad Pasha
, Deborah Lokhorst
, Pieter G. Van Dokkum
, Seery Chen
, Roberto Abraham
, Johnny Greco
, Shany Danieli
, Tim Miller
, Erin Lippitt
, Ava Polzin
, Zili Shen
, Michael A. Keim
, Qing Liu
, Allison Merritt
, Jielai Zhang

Research output: Contribution to journal › Article › peer-review

Abstract

We identify a ∼600 pc wide region of active star formation located within a tidal streamer of M82 via Hα emission (F Hα ∼ 6.5 10-14 erg s-1 cm-2), using a pathfinder instrument based on the Dragonfly Telephoto Array. The object is kinematically decoupled from the disk of M82 as confirmed via Keck/LRIS spectroscopy and is spatially and kinematically coincident with an overdensity of H i and molecular hydrogen within the "northern H i streamer"induced by the passage of M81 several hundred Myr ago. From H i data, we estimate that ∼5 107 M o˙ of gas is present in the specific overdensity coincident with the Hα source. The object's derived metallicity (12+), position within a gas-rich tidal feature, and morphology (600 pc diameter with multiple star-forming clumps), indicate that it is likely a tidal dwarf galaxy in the earliest stages of formation.

Original language	English GB
Article number	L21
Journal	Astrophysical Journal Letters
Volume	923
Issue number	2
DOIs	https://doi.org/10.3847/2041-8213/ac3ca6
State	Published - 20 Dec 2021
Externally published	Yes

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/2041-8213/ac3ca6

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title = "A Nascent Tidal Dwarf Galaxy Forming within the Northern Hi Streamer of M82",

abstract = "We identify a ∼600 pc wide region of active star formation located within a tidal streamer of M82 via Hα emission (F Hα ∼ 6.5 10-14 erg s-1 cm-2), using a pathfinder instrument based on the Dragonfly Telephoto Array. The object is kinematically decoupled from the disk of M82 as confirmed via Keck/LRIS spectroscopy and is spatially and kinematically coincident with an overdensity of H i and molecular hydrogen within the {"}northern H i streamer{"}induced by the passage of M81 several hundred Myr ago. From H i data, we estimate that ∼5 107 M o˙ of gas is present in the specific overdensity coincident with the Hα source. The object's derived metallicity (12+), position within a gas-rich tidal feature, and morphology (600 pc diameter with multiple star-forming clumps), indicate that it is likely a tidal dwarf galaxy in the earliest stages of formation.",

author = "Imad Pasha and Deborah Lokhorst and \{Van Dokkum\}, \{Pieter G.\} and Seery Chen and Roberto Abraham and Johnny Greco and Shany Danieli and Tim Miller and Erin Lippitt and Ava Polzin and Zili Shen and Keim, \{Michael A.\} and Qing Liu and Allison Merritt and Jielai Zhang",

note = "Publisher Copyright: {\textcopyright} 2021. The Author(s). Published by the American Astronomical Society..",

year = "2021",

month = dec,

day = "20",

doi = "10.3847/2041-8213/ac3ca6",

language = "الإنجليزيّة",

volume = "923",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "American Astronomical Society",

number = "2",

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TY - JOUR

T1 - A Nascent Tidal Dwarf Galaxy Forming within the Northern Hi Streamer of M82

AU - Pasha, Imad

AU - Lokhorst, Deborah

AU - Van Dokkum, Pieter G.

AU - Chen, Seery

AU - Abraham, Roberto

AU - Greco, Johnny

AU - Danieli, Shany

AU - Miller, Tim

AU - Lippitt, Erin

AU - Polzin, Ava

AU - Shen, Zili

AU - Keim, Michael A.

AU - Liu, Qing

AU - Merritt, Allison

AU - Zhang, Jielai

PY - 2021/12/20

Y1 - 2021/12/20

N2 - We identify a ∼600 pc wide region of active star formation located within a tidal streamer of M82 via Hα emission (F Hα ∼ 6.5 10-14 erg s-1 cm-2), using a pathfinder instrument based on the Dragonfly Telephoto Array. The object is kinematically decoupled from the disk of M82 as confirmed via Keck/LRIS spectroscopy and is spatially and kinematically coincident with an overdensity of H i and molecular hydrogen within the "northern H i streamer"induced by the passage of M81 several hundred Myr ago. From H i data, we estimate that ∼5 107 M o˙ of gas is present in the specific overdensity coincident with the Hα source. The object's derived metallicity (12+), position within a gas-rich tidal feature, and morphology (600 pc diameter with multiple star-forming clumps), indicate that it is likely a tidal dwarf galaxy in the earliest stages of formation.

AB - We identify a ∼600 pc wide region of active star formation located within a tidal streamer of M82 via Hα emission (F Hα ∼ 6.5 10-14 erg s-1 cm-2), using a pathfinder instrument based on the Dragonfly Telephoto Array. The object is kinematically decoupled from the disk of M82 as confirmed via Keck/LRIS spectroscopy and is spatially and kinematically coincident with an overdensity of H i and molecular hydrogen within the "northern H i streamer"induced by the passage of M81 several hundred Myr ago. From H i data, we estimate that ∼5 107 M o˙ of gas is present in the specific overdensity coincident with the Hα source. The object's derived metallicity (12+), position within a gas-rich tidal feature, and morphology (600 pc diameter with multiple star-forming clumps), indicate that it is likely a tidal dwarf galaxy in the earliest stages of formation.

UR - https://www.scopus.com/pages/publications/85122452969

U2 - 10.3847/2041-8213/ac3ca6

DO - 10.3847/2041-8213/ac3ca6

M3 - مقالة

SN - 2041-8205

VL - 923

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 2

M1 - L21

ER -

A Nascent Tidal Dwarf Galaxy Forming within the Northern Hi Streamer of M82

Abstract

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