2025ApJ...988..251V

Query : 2025ApJ...988..251V

2025ApJ...988..251V - Astrophys. J., 988, 251 (2025/August-1)

Dust in the Smith Cloud? A UV Investigation into the Smith Cloud's Gas-phase Abundance Patterns.

VAZQUEZ J.T., BARGER K.A., CASHMAN F.H., FOX A.J., WAKKER B.P., LOCKMAN F.J., HILL A.S., POUDEL S., HORTON A.L., HERNANDEZ J., NUSS M., BLAKE A., CORLIES L. and PEEPLES M.

Abstract (from CDS):

The Smith Cloud is a high-velocity cloud (HVC) on its final approach to the Milky Way that shows evidence of interaction with the Galaxy's disk. We investigate the metallicity and gas-phase chemical depletion patterns in this HVC using UV absorption-line observations toward two background QSOs taken with the Hubble Space Telescope/Cosmic Origin Spectrograph and H I 21 cm emission-line observations taken with Green Bank Telescope. We find evidence of silicon gas-phase depletion with [Si/S] = $-0.7{2}_{-0.26}^{+0.24}$ and [Si/O]3σ ≲ -0.05, implying the presence of dust within the Smith Cloud. Because dust is galactic in origin, this HVC could trace the return leg of a Galactic fountain or a dwarf galaxy that passed through the Galactic plane.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Circumgalactic medium - Interstellar dust - High-velocity clouds - Ultraviolet astronomy - Chemical abundances

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Magellanic Stream HVC 00 32 -30.0           ~ 1079 1
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
3 HD 116852 * 13 30 23.5185791544 -78 51 20.547734652 8.29 8.38 8.47     O8.5II-III((f)) 163 1
4 NAME HVC Complex C HVC 16 34.8 +63 07           ~ 273 1
5 HD 156359 s*b 17 21 18.7290160512 -62 55 05.378303532 8.55 9.52 9.72     B0Ia 88 0
6 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
7 7C 1821+6419 Sy1 18 21 57.2130271440 +64 20 36.221312076   14.23 14.24     ~ 632 1
8 NAME Sgr Arm PoG 19 00 -30.0           ~ 710 1
9 2MASS J20333589-0320385 AGN 20 33 35.8920429744 -03 20 38.608890720           ~ 5 0
10 2MASS J20430626+0324516 Sy1 20 43 06.2692727064 +03 24 51.724232352   17.0 17.0     ~ 12 0
11 NVSS J204402-075817 Sy1 20 44 02.0179088976 -07 58 10.047236160   17.31   16.22   ~ 9 0
12 NAME Gal Center Positive HVC 20 51.2 +01 41           ~ 109 1
13 2MASS J21145258+0607423 Sy1 21 14 52.5774985320 +06 07 42.433198104   16.06 15.77     ~ 227 0
14 2MASS J21394418+0246052 Sy1 21 39 44.1915455592 +02 46 05.173524732   16.1 16.1     ~ 18 0

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