J/AJ/163/18 Thin stellar stream on a retrograde orbit at 30kpc (Ferguson+, 2022)
DELVE-ing into the Jet; A Thin Stellar Stream on a Retrograde Orbit at 30kpc.
Ferguson P.S., Shipp N., Drlica-Wagner A., Li T.S., Cerny W., Tavangar K.,
Pace A.B., Marshall J.L., Riley A.H., Adamow M., Carlin J.L., Choi Y.,
Erkal D., James D.J., Koposov S.E., Kuropatkin N., Martinez-Vazquez C.E.,
Mau S., Mutlu-Pakdil B., Olsen K.A.G., Sakowska J.D., Stringfellow G.S.,
Yanny B.
<Astron. J., 163, 18 (2022)>
=2022AJ....163...18F 2022AJ....163...18F
ADC_Keywords: Milky Way; Stars, variable; Proper motions; Photometry, ugriz
Keywords: Milky Way Galaxy ; Stellar streams ; Local Group
Abstract:
We perform a detailed photometric and astrometric analysis of stars in
the Jet stream using data from the first data release of the DECam
Local Volume Exploration Survey DR1 and Gaia EDR3. We discover that
the stream extends over ∼29° on the sky (increasing the known
length by 18°), which is comparable to the kinematically cold
Phoenix, ATLAS, and GD-1 streams. Using blue horizontal branch stars,
we resolve a distance gradient along the Jet stream of 0.2kpc/deg,
with distances ranging from D☉∼27-34kpc. We use natural splines to
simultaneously fit the stream track, width, and intensity to
quantitatively characterize density variations in the Jet stream,
including a large gap, and identify substructure off the main track of
the stream. Furthermore, we report the first measurement of the proper
motion of the Jet stream and find that it is well aligned with the
stream track, suggesting the stream has likely not been significantly
perturbed perpendicular to the line of sight. Finally, we fit the
stream with a dynamical model and find that it is on a retrograde
orbit, and is well fit by a gravitational potential including the
Milky Way and Large Magellanic Cloud. These results indicate the Jet
stream is an excellent candidate for future studies with deeper
photometry, astrometry, and spectroscopy to study the potential of the
Milky Way and probe perturbations from baryonic and dark matter
substructure.
Description:
We further investigate the Jet stream using data from the DECam Local
Volume Exploration Survey (DELVE) Data Release 1 (DR1; Drlica-Wagner+,
2021ApJS..256....2D 2021ApJS..256....2D). This catalog covers over ∼4000deg2 in four
photometric bands (g, r, i, z) and over ∼5000deg2 in each band
independently.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 123 144 Probable stream member stars with membership
probability greater than 0.1
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See also:
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
II/371 : The Dark Energy Survey (DES): Data Release 2 (Abott+, 2021)
J/ApJ/757/83 : The Blanco Cosmology Survey (BCS) (Desai+, 2012)
J/ApJ/866/22 : Spectroscopic analysis of Tuc III stream (Li+, 2018)
J/ApJ/867/105 : ATLAS all-sky stellar ref. cat., ATLAS-REFCAT2 (Tonry+, 2018)
J/MNRAS/486/2995 : GD-1 stellar stream (Malhan+, 2019)
J/ApJ/875/77 : Proper motions of MW satellites with Gaia & DES (Pace+, 2019)
J/ApJ/885/3 : Membership in 12 stellar streams from DES (Shipp+, 2019)
J/MNRAS/484/2832 : Proper motions Milky Way globular clusters (Vasiliev, 2019)
J/AJ/159/287 : Stellar parameters Ophiuchus Stream with MMT (Caldwell+, 2020)
J/ApJ/893/47 : Milky Way satellite census. I. DES & PS1 (Drlica-Wagner+, 2020)
J/AJ/160/181 : Chemical abundances in red giants with Magellan (Ji+, 2020)
J/A+A/649/A3 : Gaia Early Data Release 3 photometric passbands (Riello+, 2021)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 14 I14 --- DELVE DELVE DR1 IDs; Drlica-Wagner+, 2021ApJS..256....2D 2021ApJS..256....2D
16- 34 I19 --- Gaia Gaia EDR3 IDs
36- 53 F18.14 deg RAdeg [129/149] Right Ascension (ICRS at Epoch 2015.5)
55- 73 F19.15 deg DEdeg [-34.8/-10.3] Declination (ICRS at Epoch 2015.5)
75- 79 F5.2 mag g0mag [17/19.2] g-band reddening corrected PSF
photometry, DELVE DR1
81- 85 F5.2 mag r0mag [16.4/18.7] r-band reddening corrected PSF
photometry, DELVE DR1
87- 91 F5.2 mas/yr pmRA [-1.67/0.23] Gaia EDR3 proper motion in RA
93- 96 F4.2 mas/yr e_pmRA [0.06/0.3] Uncertainty in pmRA
98-102 F5.2 mas/yr pmDE [-2.2/-0.62] Gaia EDR3 proper motion in DE
104-107 F4.2 mas/yr e_pmDE [0.05/0.4] Uncertainty in pmDE
109-113 F5.2 kpc Dist [26.8/42] Distances derived from Equation 3 (1)
115-118 F4.2 --- pi [0.11/1] probability that a star is a member of
the Jet stream
120-123 F4.2 --- e_pi [0/0.3] Uncertainty in pi
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Note (1): The Dist column gives the distance in kpc derived from Equation 3,
except for candidate BHB stars whose distances are estimated from their
predicted absolute magnitude Mg as discussed in section 3.2
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 29-Mar-2022