Improving the Determination of Supernova Cosmological Redshifts by Using Galaxy Groups
At the low-redshift end ( z < 0.05) of the Hubble diagram with Type Ia Supernovae (SNe Ia), the contribution to Hubble residual scatter from peculiar velocities (PVs) is of similar size to that due to the limitations of the standardization of the SN Ia light curves. A way to improve the redshift...
Saved in:
| Main Authors: | , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2025-01-01
|
| Series: | The Astrophysical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-4357/ada285 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832576144252076032 |
|---|---|
| author | Erik R. Peterson Bastien Carreres Anthony Carr Daniel Scolnic Ava Bailey Tamara M. Davis Dillon Brout Cullan Howlett David O. Jones Adam G. Riess Khaled Said Georgie Taylor |
| author_facet | Erik R. Peterson Bastien Carreres Anthony Carr Daniel Scolnic Ava Bailey Tamara M. Davis Dillon Brout Cullan Howlett David O. Jones Adam G. Riess Khaled Said Georgie Taylor |
| author_sort | Erik R. Peterson |
| collection | DOAJ |
| description | At the low-redshift end ( z < 0.05) of the Hubble diagram with Type Ia Supernovae (SNe Ia), the contribution to Hubble residual scatter from peculiar velocities (PVs) is of similar size to that due to the limitations of the standardization of the SN Ia light curves. A way to improve the redshift measurement of the SN host galaxy is to utilize the average redshift of the galaxy group, effectively averaging over small-scale/intracluster PVs. One limiting factor is the fraction of SN host galaxies in galaxy groups, previously found to be 30% using (relatively incomplete) magnitude-limited galaxy catalogs. Here, we do the first analysis of N -body simulations to predict this fraction, finding ∼73% should have associated groups and group averaging should improve redshift precision by ∼135 km s ^−1 (∼0.04 mag at z = 0.025). Furthermore, using spectroscopic data from the Anglo-Australian Telescope, we present results from the first pilot program to evaluate whether or not 23 previously unassociated SN Ia hosts belong in groups. We find that 91% of these candidates can be associated with groups, consistent with predictions from simulations given the sample size. Combining with previously assigned SN host galaxies in Pantheon+, we demonstrate improvement in Hubble residual scatter equivalent to 145 km s ^−1 , also consistent with simulations. For new and upcoming low- z samples from, for example, the Zwicky Transient Facility and the Legacy Survey of Space and Time, a separate follow-up program identifying galaxy groups of SN hosts is a highly cost-effective way to enhance their constraining power. |
| format | Article |
| id | doaj-art-9c09f225a3fd4e808e45698d9598077a |
| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-9c09f225a3fd4e808e45698d9598077a2025-01-31T10:48:47ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-0198012110.3847/1538-4357/ada285Improving the Determination of Supernova Cosmological Redshifts by Using Galaxy GroupsErik R. Peterson0https://orcid.org/0000-0001-8596-4746Bastien Carreres1https://orcid.org/0000-0002-7234-844XAnthony Carr2https://orcid.org/0000-0003-4074-5659Daniel Scolnic3https://orcid.org/0000-0002-4934-5849Ava Bailey4Tamara M. Davis5https://orcid.org/0000-0002-4213-8783Dillon Brout6https://orcid.org/0000-0001-5201-8374Cullan Howlett7https://orcid.org/0000-0002-1081-9410David O. Jones8https://orcid.org/0000-0002-6230-0151Adam G. Riess9https://orcid.org/0000-0002-6124-1196Khaled Said10https://orcid.org/0000-0002-1809-6325Georgie Taylor11https://orcid.org/0000-0001-5756-3259Department of Physics, Duke University , Durham, NC 27708, USADepartment of Physics, Duke University , Durham, NC 27708, USASchool of Mathematics and Physics, University of Queensland , Brisbane, QLD 4072, Australia; Korea Astronomy and Space Science Institute , Yuseong-gu, Daedeok-daero 776, Daejeon 34055, Republic of KoreaDepartment of Physics, Duke University , Durham, NC 27708, USADepartment of Physics, Duke University , Durham, NC 27708, USASchool of Mathematics and Physics, University of Queensland , Brisbane, QLD 4072, AustraliaDepartment of Astronomy and Physics, Boston University , Boston, MA 02140, USASchool of Mathematics and Physics, University of Queensland , Brisbane, QLD 4072, Australia; OzGrav: The ARC Centre of Excellence for Gravitational Wave Discovery , Hawthorn, VIC 3122, AustraliaInstitute for Astronomy, University of Hawai‘i , 640 N. A’ohoku Pl., Hilo, HI 96720, USASpace Telescope Science Institute , Baltimore, MD 21218, USA; Department of Physics and Astronomy, Johns Hopkins University , Baltimore, MD 21218, USASchool of Mathematics and Physics, University of Queensland , Brisbane, QLD 4072, AustraliaResearch School of Astronomy and Astrophysics, The Australian National University , ACT 2601, AustraliaAt the low-redshift end ( z < 0.05) of the Hubble diagram with Type Ia Supernovae (SNe Ia), the contribution to Hubble residual scatter from peculiar velocities (PVs) is of similar size to that due to the limitations of the standardization of the SN Ia light curves. A way to improve the redshift measurement of the SN host galaxy is to utilize the average redshift of the galaxy group, effectively averaging over small-scale/intracluster PVs. One limiting factor is the fraction of SN host galaxies in galaxy groups, previously found to be 30% using (relatively incomplete) magnitude-limited galaxy catalogs. Here, we do the first analysis of N -body simulations to predict this fraction, finding ∼73% should have associated groups and group averaging should improve redshift precision by ∼135 km s ^−1 (∼0.04 mag at z = 0.025). Furthermore, using spectroscopic data from the Anglo-Australian Telescope, we present results from the first pilot program to evaluate whether or not 23 previously unassociated SN Ia hosts belong in groups. We find that 91% of these candidates can be associated with groups, consistent with predictions from simulations given the sample size. Combining with previously assigned SN host galaxies in Pantheon+, we demonstrate improvement in Hubble residual scatter equivalent to 145 km s ^−1 , also consistent with simulations. For new and upcoming low- z samples from, for example, the Zwicky Transient Facility and the Legacy Survey of Space and Time, a separate follow-up program identifying galaxy groups of SN hosts is a highly cost-effective way to enhance their constraining power.https://doi.org/10.3847/1538-4357/ada285CosmologyGalaxy groupsType Ia supernovae |
| spellingShingle | Erik R. Peterson Bastien Carreres Anthony Carr Daniel Scolnic Ava Bailey Tamara M. Davis Dillon Brout Cullan Howlett David O. Jones Adam G. Riess Khaled Said Georgie Taylor Improving the Determination of Supernova Cosmological Redshifts by Using Galaxy Groups The Astrophysical Journal Cosmology Galaxy groups Type Ia supernovae |
| title | Improving the Determination of Supernova Cosmological Redshifts by Using Galaxy Groups |
| title_full | Improving the Determination of Supernova Cosmological Redshifts by Using Galaxy Groups |
| title_fullStr | Improving the Determination of Supernova Cosmological Redshifts by Using Galaxy Groups |
| title_full_unstemmed | Improving the Determination of Supernova Cosmological Redshifts by Using Galaxy Groups |
| title_short | Improving the Determination of Supernova Cosmological Redshifts by Using Galaxy Groups |
| title_sort | improving the determination of supernova cosmological redshifts by using galaxy groups |
| topic | Cosmology Galaxy groups Type Ia supernovae |
| url | https://doi.org/10.3847/1538-4357/ada285 |
| work_keys_str_mv | AT erikrpeterson improvingthedeterminationofsupernovacosmologicalredshiftsbyusinggalaxygroups AT bastiencarreres improvingthedeterminationofsupernovacosmologicalredshiftsbyusinggalaxygroups AT anthonycarr improvingthedeterminationofsupernovacosmologicalredshiftsbyusinggalaxygroups AT danielscolnic improvingthedeterminationofsupernovacosmologicalredshiftsbyusinggalaxygroups AT avabailey improvingthedeterminationofsupernovacosmologicalredshiftsbyusinggalaxygroups AT tamaramdavis improvingthedeterminationofsupernovacosmologicalredshiftsbyusinggalaxygroups AT dillonbrout improvingthedeterminationofsupernovacosmologicalredshiftsbyusinggalaxygroups AT cullanhowlett improvingthedeterminationofsupernovacosmologicalredshiftsbyusinggalaxygroups AT davidojones improvingthedeterminationofsupernovacosmologicalredshiftsbyusinggalaxygroups AT adamgriess improvingthedeterminationofsupernovacosmologicalredshiftsbyusinggalaxygroups AT khaledsaid improvingthedeterminationofsupernovacosmologicalredshiftsbyusinggalaxygroups AT georgietaylor improvingthedeterminationofsupernovacosmologicalredshiftsbyusinggalaxygroups |