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Emission-line Data Cubes of the HH 32 Stellar Jet

Hartigan, Patrick and Hillenbrand, Lynne A. and Matuszewski, Matuesz and Chan Borges, Arlindo and Neill, James D. and Martin, D. Christopher and Morrissey, Patrick and Moore, Anna M. (2020) Emission-line Data Cubes of the HH 32 Stellar Jet. Astronomical Journal, 160 (4). Art. No. 165. ISSN 1538-3881. doi:10.3847/1538-3881/abadfa.

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We analyze data cubes of over 60 emission lines in the HH 32 stellar jet acquired with the Keck Cosmic Web Imager (KCWI). The data cover the less explored blue portion of the spectrum between 3586 and 6351 Å and have both high spectral (R ~ 10,000) and spatial (≾ 1") resolution. The study includes all three major ionization states of oxygen, three Balmer lines, multiple lines of Fe ii and Fe iii, and the first data cubes ever acquired for important unblended diagnostic lines such as He ii λ4686, Ca i λ3933, and Mg i] λ4571. The data cubes generally sort according to excitation and have a relatively continuous progression from the highest-excitation ions (He ii, O iii) through the intermediate-excitation ions (O i and H i) to the lowest-excitation ions (Ca ii and Mg i). Merging the KCWI cubes with Hubble Space Telescope images leads to several new insights about the flow, including evidence for bow shocks, partial bow shocks, spur shocks, Mach disks, jet deflection shocks, a wiggling jet, and potential shock precursors. The most surprising result is that one of the velocity components of Fe ii in the Mach disk suddenly increases in flux relative to other lines by a factor of two, implying that the Mach disk vaporizes dust in the jet. Hence, jets must accelerate or entrain dust to speeds of over 300 km s⁻¹ without destroying the grains.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Hartigan, Patrick0000-0002-5380-549X
Neill, James D.0000-0002-0466-1119
Martin, D. Christopher0000-0002-8650-1644
Morrissey, Patrick0000-0001-8177-1023
Moore, Anna M.0000-0002-2894-6936
Alternate Title:Emission-Line Datacubes of the HH 32 Stellar Jet
Additional Information:© 2020. The American Astronomical Society. Received 2020 July 9; revised 2020 August 7; accepted 2020 August 7; published 2020 September 11. We thank Luca Rizzi for his participation in these KCWI commissioning observations. This work has made use of data from the European Space Agency (ESA) mission Gaia processed by the Gaia Data Processing and Analysis Consortium. Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. Facility: Keck (KCWI).
Group:Astronomy Department
Funding AgencyGrant Number
Gaia Multilateral AgreementUNSPECIFIED
Subject Keywords:Herbig-Haro objects; Stellar jets ; Astrophysical dust processes ; Shocks
Issue or Number:4
Classification Code:Unified Astronomy Thesaurus concepts: Herbig-Haro objects (722); Stellar jets (1607); Astrophysical dust processes (98); Shocks (2086)
Record Number:CaltechAUTHORS:20200911-133140492
Persistent URL:
Official Citation:Patrick Hartigan et al 2020 AJ 160 165
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105363
Deposited By: George Porter
Deposited On:11 Sep 2020 22:51
Last Modified:16 Nov 2021 18:42

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