Reading between the (Spectral) Lines: Magellan/IMACS Spectroscopy of the Ultrafaint Dwarf Galaxies Eridanus IV and Centaurus I
Abstract
Abstract We present a spectroscopic analysis of Eridanus IV (Eri IV) and Centaurus I (Cen I), two ultrafaint dwarf galaxies of the Milky Way. Using IMACS/Magellan spectroscopy, we identify 28 member stars of Eri IV and 34 member stars of Cen I. For Eri IV, we measure a systemic velocity of , and velocity dispersion . Additionally, we measure the metallicities of 16 member stars of Eri IV. We find a metallicity of , and resolve a dispersion of σ [Fe/H] =0.20 ± 0.09. The mean metallicity is marginally lower than all other known ultrafaint dwarf galaxies, making it one of the most metal-poor galaxies discovered thus far. Eri IV also has a somewhat unusual right-skewed metallicity distribution. For Cen I, we find a velocity v sys = 44.9 ± 0.8 km s −1 , and velocity dispersion . We measure the metallicities of 27 member stars of Cen I, and find a mean metallicity [Fe/H] = −2.57 ± 0.08, and metallicity dispersion . We calculate the systemic proper motion, orbit, and the astrophysical J-factor for each system, the latter of which indicates that Eri IV is a good target for indirect dark matter detection. We also find no strong evidence for tidal stripping of Cen I or Eri IV. Overall, our measurements confirm that Eri IV and Cen I are dark-matter-dominated galaxies with properties largely consistent with other known ultrafaint dwarf galaxies. The low metallicity, right-skewed metallicity distribution, and high J-factor make Eri IV an especially interesting candidate for further follow-up.
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- OSTI Identifier:
- 2283259
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- Published Article
- Journal Name:
- The Astrophysical Journal
- Additional Journal Information:
- Journal Name: The Astrophysical Journal Journal Volume: 961 Journal Issue: 2; Journal ID: ISSN 0004-637X
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- American Astronomical Society
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Heiger, M. E., Li, T. S., Pace, A. B., Simon, J. D., Ji, A. P., Chiti, A., Bom, C. R., Carballo-Bello, J. A., Carlin, J. L., Cerny, W., Choi, Y., Drlica-Wagner, A., James, D. J., Martínez-Vázquez, C. E., Medina, G. E., Mutlu-Pakdil, B., Navabi, M., Noël, N. E. D., Sakowska, J. D., Stringfellow, G. S., and DELVE Collaboration). Reading between the (Spectral) Lines: Magellan/IMACS Spectroscopy of the Ultrafaint Dwarf Galaxies Eridanus IV and Centaurus I. United States: N. p., 2024.
Web. doi:10.3847/1538-4357/ad0cf7.
Heiger, M. E., Li, T. S., Pace, A. B., Simon, J. D., Ji, A. P., Chiti, A., Bom, C. R., Carballo-Bello, J. A., Carlin, J. L., Cerny, W., Choi, Y., Drlica-Wagner, A., James, D. J., Martínez-Vázquez, C. E., Medina, G. E., Mutlu-Pakdil, B., Navabi, M., Noël, N. E. D., Sakowska, J. D., Stringfellow, G. S., & DELVE Collaboration). Reading between the (Spectral) Lines: Magellan/IMACS Spectroscopy of the Ultrafaint Dwarf Galaxies Eridanus IV and Centaurus I. United States. https://doi.org/10.3847/1538-4357/ad0cf7
Heiger, M. E., Li, T. S., Pace, A. B., Simon, J. D., Ji, A. P., Chiti, A., Bom, C. R., Carballo-Bello, J. A., Carlin, J. L., Cerny, W., Choi, Y., Drlica-Wagner, A., James, D. J., Martínez-Vázquez, C. E., Medina, G. E., Mutlu-Pakdil, B., Navabi, M., Noël, N. E. D., Sakowska, J. D., Stringfellow, G. S., and DELVE Collaboration). Tue .
"Reading between the (Spectral) Lines: Magellan/IMACS Spectroscopy of the Ultrafaint Dwarf Galaxies Eridanus IV and Centaurus I". United States. https://doi.org/10.3847/1538-4357/ad0cf7.
@article{osti_2283259,
title = {Reading between the (Spectral) Lines: Magellan/IMACS Spectroscopy of the Ultrafaint Dwarf Galaxies Eridanus IV and Centaurus I},
author = {Heiger, M. E. and Li, T. S. and Pace, A. B. and Simon, J. D. and Ji, A. P. and Chiti, A. and Bom, C. R. and Carballo-Bello, J. A. and Carlin, J. L. and Cerny, W. and Choi, Y. and Drlica-Wagner, A. and James, D. J. and Martínez-Vázquez, C. E. and Medina, G. E. and Mutlu-Pakdil, B. and Navabi, M. and Noël, N. E. D. and Sakowska, J. D. and Stringfellow, G. S. and DELVE Collaboration)},
abstractNote = {Abstract We present a spectroscopic analysis of Eridanus IV (Eri IV) and Centaurus I (Cen I), two ultrafaint dwarf galaxies of the Milky Way. Using IMACS/Magellan spectroscopy, we identify 28 member stars of Eri IV and 34 member stars of Cen I. For Eri IV, we measure a systemic velocity of v sys = − 31.5 − 1.2 + 1.3 km s − 1 , and velocity dispersion σ v = 6.1 − 0.9 + 1.2 km s − 1 . Additionally, we measure the metallicities of 16 member stars of Eri IV. We find a metallicity of [ Fe / H ] = − 2.87 − 0.07 + 0.08 , and resolve a dispersion of σ [Fe/H] =0.20 ± 0.09. The mean metallicity is marginally lower than all other known ultrafaint dwarf galaxies, making it one of the most metal-poor galaxies discovered thus far. Eri IV also has a somewhat unusual right-skewed metallicity distribution. For Cen I, we find a velocity v sys = 44.9 ± 0.8 km s −1 , and velocity dispersion σ v = 4.2 − 0.5 + 0.6 km s − 1 . We measure the metallicities of 27 member stars of Cen I, and find a mean metallicity [Fe/H] = −2.57 ± 0.08, and metallicity dispersion σ [ Fe / H ] = 0.38 − 0.05 + 0.07 . We calculate the systemic proper motion, orbit, and the astrophysical J-factor for each system, the latter of which indicates that Eri IV is a good target for indirect dark matter detection. We also find no strong evidence for tidal stripping of Cen I or Eri IV. Overall, our measurements confirm that Eri IV and Cen I are dark-matter-dominated galaxies with properties largely consistent with other known ultrafaint dwarf galaxies. The low metallicity, right-skewed metallicity distribution, and high J-factor make Eri IV an especially interesting candidate for further follow-up.},
doi = {10.3847/1538-4357/ad0cf7},
journal = {The Astrophysical Journal},
number = 2,
volume = 961,
place = {United States},
year = {Tue Jan 30 00:00:00 EST 2024},
month = {Tue Jan 30 00:00:00 EST 2024}
}
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- Agertz, Oscar; Pontzen, Andrew; Read, Justin I.
- Monthly Notices of the Royal Astronomical Society, Vol. 491, Issue 2
Milky Way Satellite Census. I. The Observational Selection Function for Milky Way Satellites in DES Y3 and Pan-STARRS DR1
journal, April 2020
- Drlica-Wagner, A.; Bechtol, K.; Mau, S.
- The Astrophysical Journal, Vol. 893, Issue 1
grumpy : a simple framework for realistic forward modelling of dwarf galaxies
journal, May 2022
- Kravtsov, Andrey; Manwadkar, Viraj
- Monthly Notices of the Royal Astronomical Society, Vol. 514, Issue 2
Scaling relations for dark matter annihilation and decay profiles in dwarf spheroidal galaxies
journal, October 2018
- Pace, Andrew B.; Strigari, Louis E.
- Monthly Notices of the Royal Astronomical Society, Vol. 482, Issue 3
And yet it Moves: the Dangers of Artificially Fixing the Milky way Center of mass in the Presence of a Massive Large Magellanic Cloud
journal, April 2015
- Gómez, Facundo A.; Besla, Gurtina; Carpintero, Daniel D.
- The Astrophysical Journal, Vol. 802, Issue 2
Be it therefore resolved: cosmological simulations of dwarf galaxies with 30 solar mass resolution
journal, October 2019
- Wheeler, Coral; Hopkins, Philip F.; Pace, Andrew B.
- Monthly Notices of the Royal Astronomical Society, Vol. 490, Issue 3
Small-Scale Challenges to the Λ CDM Paradigm
journal, August 2017
- Bullock, James S.; Boylan-Kolchin, Michael
- Annual Review of Astronomy and Astrophysics, Vol. 55, Issue 1
The First Tidally Disrupted Ultra-faint Dwarf Galaxy?: A Spectroscopic Analysis of the Tucana III Stream
journal, October 2018
- Li, T. S.; Simon, J. D.; Kuehn, K.
- The Astrophysical Journal, Vol. 866, Issue 1
Kinematics and Chemistry of Recently Discovered Reticulum 2 and Horologium 1 Dwarf Galaxies
journal, September 2015
- Koposov, Sergey E.; Casey, Andrew R.; Belokurov, Vasily
- The Astrophysical Journal, Vol. 811, Issue 1
GaiaData Release 3
journal, June 2023
- Clementini, G.; Ripepi, V.; Garofalo, A.
- Astronomy & Astrophysics, Vol. 674
Simulating an isolated dwarf galaxy with multichannel feedback and chemical yields from individual stars
journal, October 2018
- Emerick, Andrew; Bryan, Greg L.; Mac Low, Mordecai-Mark
- Monthly Notices of the Royal Astronomical Society, Vol. 482, Issue 1
Farthest Neighbor: The Distant Milky Way Satellite Eridanus II
journal, March 2017
- Li, T. S.; Simon, J. D.; Drlica-Wagner, A.
- The Astrophysical Journal, Vol. 838, Issue 1
The DECam Local Volume Exploration Survey Data Release 2
journal, August 2022
- Drlica-Wagner, A.; Ferguson, P. S.; Adamów, M.
- The Astrophysical Journal Supplement Series, Vol. 261, Issue 2