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Probing the environment around GW170817 with DESI: insights on galaxy group peculiar velocities for standard siren measurements

Fuente: arXiv

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Main Authors:	Amsellem, A. J., Palmese, A., Douglass, K., Howlett, C., Karp, Juliana S. M., Hernandez, I. Magaña, Moustakas, J., Wechsler, R. H., Aguilar, J., Ahlen, S., Benzvi, S., Bianchi, D., Brooks, D., Carr, A., Claybaugh, T., Cuceu, A., Davis, Tamara M., de la Macorra, A., Dey, Arjun, Dey, Biprateep, Doel, P., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. Gontcho A, Gutierrez, G., Honscheid, K., Ishak, M., Joyce, R., Kehoe, R., Kisner, T., Kremin, A., Lahav, O., Lambert, A., Landriau, M., Guillou, L. Le, Manera, M., Manwadkar, V., Meisner, A., Miquel, R., Myers, A. D., Nadathur, S., Niz, G., Palanque-Delabrouille, N., Percival, W. J., Poppett, C., Prada, F., Pérez-Ràfols, I., Raichoor, A., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Seo, H., Silber, J., Sprayberry, D., Tarlé, G., Zhou, R., Collaboration, the DESI
Format:	Preprint
Published:	2025
Subjects:	Cosmology and Nongalactic Astrophysics
Online Access:	Acceder al recurso
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_version_	1866908702171201536
author	Amsellem, A. J. Palmese, A. Douglass, K. Howlett, C. Karp, Juliana S. M. Hernandez, I. Magaña Moustakas, J. Wechsler, R. H. Aguilar, J. Ahlen, S. Benzvi, S. Bianchi, D. Brooks, D. Carr, A. Claybaugh, T. Cuceu, A. Davis, Tamara M. de la Macorra, A. Dey, Arjun Dey, Biprateep Doel, P. Font-Ribera, A. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Honscheid, K. Ishak, M. Joyce, R. Kehoe, R. Kisner, T. Kremin, A. Lahav, O. Lambert, A. Landriau, M. Guillou, L. Le Manera, M. Manwadkar, V. Meisner, A. Miquel, R. Myers, A. D. Nadathur, S. Niz, G. Palanque-Delabrouille, N. Percival, W. J. Poppett, C. Prada, F. Pérez-Ràfols, I. Raichoor, A. Rossi, G. Sanchez, E. Schlegel, D. Schubnell, M. Seo, H. Silber, J. Sprayberry, D. Tarlé, G. Zhou, R. Collaboration, the DESI
author_facet	Amsellem, A. J. Palmese, A. Douglass, K. Howlett, C. Karp, Juliana S. M. Hernandez, I. Magaña Moustakas, J. Wechsler, R. H. Aguilar, J. Ahlen, S. Benzvi, S. Bianchi, D. Brooks, D. Carr, A. Claybaugh, T. Cuceu, A. Davis, Tamara M. de la Macorra, A. Dey, Arjun Dey, Biprateep Doel, P. Font-Ribera, A. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Honscheid, K. Ishak, M. Joyce, R. Kehoe, R. Kisner, T. Kremin, A. Lahav, O. Lambert, A. Landriau, M. Guillou, L. Le Manera, M. Manwadkar, V. Meisner, A. Miquel, R. Myers, A. D. Nadathur, S. Niz, G. Palanque-Delabrouille, N. Percival, W. J. Poppett, C. Prada, F. Pérez-Ràfols, I. Raichoor, A. Rossi, G. Sanchez, E. Schlegel, D. Schubnell, M. Seo, H. Silber, J. Sprayberry, D. Tarlé, G. Zhou, R. Collaboration, the DESI
contents	We present a new measurement of the Hubble constant, $H_0$, following the gravitational wave event GW170817 and Dark Energy Spectroscopic Instrument (DESI) observations. A standard siren measurement with a nearby (luminosity distance $\sim 40 $ Mpc) event such as GW170817 is typically sensitive to the peculiar motion of the host galaxy due to local dynamics. Previous measurements from this event have taken advantage of peculiar velocity measurements of nearby galaxies, including a handful of objects in the galaxy group that the host of the event, NGC 4993, has been associated with. Still, the group's properties and NGC 4993's membership were debated. We present DESI observations of thousands of galaxies in the vicinity of NGC 4993, resulting in 39 group galaxies and a five-fold increase in galaxies compared to previous observations with many of these galaxies contributing to a peculiar velocity measurement. Examining the local dynamics, our observations support the presence of a galaxy group of which NGC 4993 is part with a halo mass of order $\sim$$10^{13}~M_\odot$. Using peculiar velocity measurements from our Fundamental Plane galaxies observations, we find $H_0 =70.9^{+6.4}_{-8.5}$ km s$^{-1}$ Mpc$^{-1}$. In addition, using a peculiar velocity measurement for NGC 4993 from Surface Brightness Fluctuations in Cosmicflows-4 we find $H_0 =73.4^{+3.3}_{-3.9}$ km s$^{-1}$ Mpc$^{-1}$. We study the impact of different galaxy selection criteria on the determination of the peculiar velocity and, in turn, on the $H_0$ measurement. Our results highlight the importance of multiplexed spectroscopic observations of the environments of gravitational wave events to probe local dynamics, which can ultimately affect standard siren measurements.
format	Preprint
id	arxiv_https___arxiv_org_abs_2512_08818
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Probing the environment around GW170817 with DESI: insights on galaxy group peculiar velocities for standard siren measurements Amsellem, A. J. Palmese, A. Douglass, K. Howlett, C. Karp, Juliana S. M. Hernandez, I. Magaña Moustakas, J. Wechsler, R. H. Aguilar, J. Ahlen, S. Benzvi, S. Bianchi, D. Brooks, D. Carr, A. Claybaugh, T. Cuceu, A. Davis, Tamara M. de la Macorra, A. Dey, Arjun Dey, Biprateep Doel, P. Font-Ribera, A. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Honscheid, K. Ishak, M. Joyce, R. Kehoe, R. Kisner, T. Kremin, A. Lahav, O. Lambert, A. Landriau, M. Guillou, L. Le Manera, M. Manwadkar, V. Meisner, A. Miquel, R. Myers, A. D. Nadathur, S. Niz, G. Palanque-Delabrouille, N. Percival, W. J. Poppett, C. Prada, F. Pérez-Ràfols, I. Raichoor, A. Rossi, G. Sanchez, E. Schlegel, D. Schubnell, M. Seo, H. Silber, J. Sprayberry, D. Tarlé, G. Zhou, R. Collaboration, the DESI Cosmology and Nongalactic Astrophysics We present a new measurement of the Hubble constant, $H_0$, following the gravitational wave event GW170817 and Dark Energy Spectroscopic Instrument (DESI) observations. A standard siren measurement with a nearby (luminosity distance $\sim 40 $ Mpc) event such as GW170817 is typically sensitive to the peculiar motion of the host galaxy due to local dynamics. Previous measurements from this event have taken advantage of peculiar velocity measurements of nearby galaxies, including a handful of objects in the galaxy group that the host of the event, NGC 4993, has been associated with. Still, the group's properties and NGC 4993's membership were debated. We present DESI observations of thousands of galaxies in the vicinity of NGC 4993, resulting in 39 group galaxies and a five-fold increase in galaxies compared to previous observations with many of these galaxies contributing to a peculiar velocity measurement. Examining the local dynamics, our observations support the presence of a galaxy group of which NGC 4993 is part with a halo mass of order $\sim$$10^{13}~M_\odot$. Using peculiar velocity measurements from our Fundamental Plane galaxies observations, we find $H_0 =70.9^{+6.4}_{-8.5}$ km s$^{-1}$ Mpc$^{-1}$. In addition, using a peculiar velocity measurement for NGC 4993 from Surface Brightness Fluctuations in Cosmicflows-4 we find $H_0 =73.4^{+3.3}_{-3.9}$ km s$^{-1}$ Mpc$^{-1}$. We study the impact of different galaxy selection criteria on the determination of the peculiar velocity and, in turn, on the $H_0$ measurement. Our results highlight the importance of multiplexed spectroscopic observations of the environments of gravitational wave events to probe local dynamics, which can ultimately affect standard siren measurements.
title	Probing the environment around GW170817 with DESI: insights on galaxy group peculiar velocities for standard siren measurements
topic	Cosmology and Nongalactic Astrophysics
url	https://arxiv.org/abs/2512.08818