Is Draco II one of the faintest dwarf galaxies? First study from Keck/DEIMOS spectroscopy

Nicolas F. Martin; Marla Geha; Rodrigo A. Ibata; Michelle L. M. Collins; Benjamin P. M. Laevens; Eric F. Bell; Hans-Walter Rix; Annette M. N. Ferguson; Kenneth C. Chambers; Richard J. Wainscoat; Christopher Waters

doi:10.1093/mnrasl/slw013

Is Draco II one of the faintest dwarf galaxies? First study from Keck/DEIMOS spectroscopy

Nicolas F. Martin
, Marla Geha
, Rodrigo A. Ibata
, Michelle L. M. Collins
, Benjamin P. M. Laevens
, Eric F. Bell
, Hans-Walter Rix
, Annette M. N. Ferguson
, Kenneth C. Chambers
, Richard J. Wainscoat
, Christopher Waters

School of Physics and Astronomy

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

Abstract

We present the first spectroscopic analysis of the faint and compact stellar system Draco II (Dra II, MV = -2.9 ± 0.8, r_h=19^{+8}_{-6} pc), recently discovered in the Panoramic Survey Telescope and Rapid Response System 1 3π survey. The observations, conducted with DEIMOS on the Keck II telescope, establish some of its basic characteristics: the velocity data reveal a narrow peak with nine member stars at a systemic heliocentric velocity <v_rrangle =-347.6^{+1.7}_{-1.8} km s^{-1}, thereby confirming Dra II is a satellite of the Milky Way; we infer a velocity dispersion with σvr = 2.9 ± 2.1 km s-1 (

Original language	English
Journal	Monthly Notices of the Royal Astronomical Society: Letters
Volume	458
Issue number	1
DOIs	https://doi.org/10.1093/mnrasl/slw013
Publication status	Published - 1 May 2016

Keywords / Materials (for Non-textual outputs)

galaxies: individual: Draco II
galaxies: kinematics and dynamics
Local Group

Access to Document

10.1093/mnrasl/slw013

L59.fullFinal published version, 660 KB

Cite this

Martin, N. F., Geha, M., Ibata, R. A., Collins, M. L. M., Laevens, B. P. M., Bell, E. F., Rix, H.-W., Ferguson, A. M. N., Chambers, K. C., Wainscoat, R. J., & Waters, C. (2016). Is Draco II one of the faintest dwarf galaxies? First study from Keck/DEIMOS spectroscopy. Monthly Notices of the Royal Astronomical Society: Letters, 458(1). https://doi.org/10.1093/mnrasl/slw013

@article{627c738795c4400987198039dd68ce4d,

title = "Is Draco II one of the faintest dwarf galaxies? First study from Keck/DEIMOS spectroscopy",

abstract = "We present the first spectroscopic analysis of the faint and compact stellar system Draco II (Dra II, MV = -2.9 ± 0.8, r\_h=19\textasciicircum{}\{+8\}\_\{-6\} pc), recently discovered in the Panoramic Survey Telescope and Rapid Response System 1 3π survey. The observations, conducted with DEIMOS on the Keck II telescope, establish some of its basic characteristics: the velocity data reveal a narrow peak with nine member stars at a systemic heliocentric velocity ",

keywords = "galaxies: individual: Draco II, galaxies: kinematics and dynamics, Local Group",

author = "Martin, \{Nicolas F.\} and Marla Geha and Ibata, \{Rodrigo A.\} and Collins, \{Michelle L. M.\} and Laevens, \{Benjamin P. M.\} and Bell, \{Eric F.\} and Hans-Walter Rix and Ferguson, \{Annette M. N.\} and Chambers, \{Kenneth C.\} and Wainscoat, \{Richard J.\} and Christopher Waters",

year = "2016",

month = may,

day = "1",

doi = "10.1093/mnrasl/slw013",

language = "English",

volume = "458",

journal = "Monthly Notices of the Royal Astronomical Society: Letters",

issn = "1745-3933",

publisher = "Oxford University Press",

number = "1",

}

TY - JOUR

T1 - Is Draco II one of the faintest dwarf galaxies? First study from Keck/DEIMOS spectroscopy

AU - Martin, Nicolas F.

AU - Geha, Marla

AU - Ibata, Rodrigo A.

AU - Collins, Michelle L. M.

AU - Laevens, Benjamin P. M.

AU - Bell, Eric F.

AU - Rix, Hans-Walter

AU - Ferguson, Annette M. N.

AU - Chambers, Kenneth C.

AU - Wainscoat, Richard J.

AU - Waters, Christopher

PY - 2016/5/1

Y1 - 2016/5/1

N2 - We present the first spectroscopic analysis of the faint and compact stellar system Draco II (Dra II, MV = -2.9 ± 0.8, r_h=19^{+8}_{-6} pc), recently discovered in the Panoramic Survey Telescope and Rapid Response System 1 3π survey. The observations, conducted with DEIMOS on the Keck II telescope, establish some of its basic characteristics: the velocity data reveal a narrow peak with nine member stars at a systemic heliocentric velocity

AB - We present the first spectroscopic analysis of the faint and compact stellar system Draco II (Dra II, MV = -2.9 ± 0.8, r_h=19^{+8}_{-6} pc), recently discovered in the Panoramic Survey Telescope and Rapid Response System 1 3π survey. The observations, conducted with DEIMOS on the Keck II telescope, establish some of its basic characteristics: the velocity data reveal a narrow peak with nine member stars at a systemic heliocentric velocity

KW - galaxies: individual: Draco II

KW - galaxies: kinematics and dynamics

KW - Local Group

U2 - 10.1093/mnrasl/slw013

DO - 10.1093/mnrasl/slw013

M3 - Article

SN - 1745-3933

VL - 458

JO - Monthly Notices of the Royal Astronomical Society: Letters

JF - Monthly Notices of the Royal Astronomical Society: Letters

IS - 1

ER -

Is Draco II one of the faintest dwarf galaxies? First study from Keck/DEIMOS spectroscopy

Abstract

Keywords / Materials (for Non-textual outputs)

Access to Document

Fingerprint

Cite this