{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:RGMOP2UXLEVFQHS6EV37MUTVOL","short_pith_number":"pith:RGMOP2UX","canonical_record":{"source":{"id":"1605.04913","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-05-16T20:00:04Z","cross_cats_sorted":[],"title_canon_sha256":"c12df3ec556a05cb326c569310ae444365eab870a07e5abe3de49c8b4c40733c","abstract_canon_sha256":"5dd28bb5ac64d3d9c1c54f142802323c602f4c1b372503406aee52454b5c46d6"},"schema_version":"1.0"},"canonical_sha256":"8998e7ea97592a581e5e2577f6527572d6923a64f1f6cb044c57169614fcc947","source":{"kind":"arxiv","id":"1605.04913","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1605.04913","created_at":"2026-05-18T00:49:18Z"},{"alias_kind":"arxiv_version","alias_value":"1605.04913v1","created_at":"2026-05-18T00:49:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.04913","created_at":"2026-05-18T00:49:18Z"},{"alias_kind":"pith_short_12","alias_value":"RGMOP2UXLEVF","created_at":"2026-05-18T12:30:41Z"},{"alias_kind":"pith_short_16","alias_value":"RGMOP2UXLEVFQHS6","created_at":"2026-05-18T12:30:41Z"},{"alias_kind":"pith_short_8","alias_value":"RGMOP2UX","created_at":"2026-05-18T12:30:41Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:RGMOP2UXLEVFQHS6EV37MUTVOL","target":"record","payload":{"canonical_record":{"source":{"id":"1605.04913","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-05-16T20:00:04Z","cross_cats_sorted":[],"title_canon_sha256":"c12df3ec556a05cb326c569310ae444365eab870a07e5abe3de49c8b4c40733c","abstract_canon_sha256":"5dd28bb5ac64d3d9c1c54f142802323c602f4c1b372503406aee52454b5c46d6"},"schema_version":"1.0"},"canonical_sha256":"8998e7ea97592a581e5e2577f6527572d6923a64f1f6cb044c57169614fcc947","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:49:18.647986Z","signature_b64":"gm/fLGZemZjj0309/eGaAScpN60G6p9yJGyOcBL8hI/CSaud5tjSRxn8km7s3cVerF8kFxEHz+fAa4fKkWY3AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8998e7ea97592a581e5e2577f6527572d6923a64f1f6cb044c57169614fcc947","last_reissued_at":"2026-05-18T00:49:18.647534Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:49:18.647534Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1605.04913","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:49:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XGZIAjKf/+CJ2z7PzMqLGK9N0wvGsdMYCoWtJGPZC6fxjW4ooPHIgO8RZp+DMhxXVS8YvF/68Gp6QKOSODQrCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-01T22:36:18.889617Z"},"content_sha256":"f54dcab93af132fb78cb470c017993d84ccaa9730e02554a9810604df41fc5a3","schema_version":"1.0","event_id":"sha256:f54dcab93af132fb78cb470c017993d84ccaa9730e02554a9810604df41fc5a3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:RGMOP2UXLEVFQHS6EV37MUTVOL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Possible Solution for the M/L-[Fe/H] Relation of Globular Clusters in M31: A metallicity and density dependent top-heavy IMF","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Akram Hasani Zonoozi (IASBS), Hosein Haghi (IASBS), Pavel Kroupa (University of Bonn)","submitted_at":"2016-05-16T20:00:04Z","abstract_excerpt":"The observed mass-to-light ($M/L$) ratios of a large sample of GCs in M31 show an inverse trend with metallicity compared to what is expected from Simple Stellar Population (SSP) models with an invariant canonical stellar IMF, in the sense that the observed $M/L$ ratios decrease with increasing metallicity. We show that incorporating the effect of dynamical evolution the SSP models with a canonical IMF can not explain the decreasing $M/L$ ratios with increasing metallicity for the M31 GCs. The recently derived top-heavy IMF as a function of metallicity and embedded cluster density is proposed "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.04913","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:49:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"r66O+SIjQyhddn1mPbMEnv+kt4tFAfNYtOoZkEm3Aghy0UZTvQ9t0mw3ze0Js7gNNWNw+QLcuUxaHSYojovfAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-01T22:36:18.890073Z"},"content_sha256":"ef494e5b97e69789671119743ed90afe98e48e9b6f729c63d10628c070d74b16","schema_version":"1.0","event_id":"sha256:ef494e5b97e69789671119743ed90afe98e48e9b6f729c63d10628c070d74b16"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RGMOP2UXLEVFQHS6EV37MUTVOL/bundle.json","state_url":"https://pith.science/pith/RGMOP2UXLEVFQHS6EV37MUTVOL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RGMOP2UXLEVFQHS6EV37MUTVOL/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-01T22:36:18Z","links":{"resolver":"https://pith.science/pith/RGMOP2UXLEVFQHS6EV37MUTVOL","bundle":"https://pith.science/pith/RGMOP2UXLEVFQHS6EV37MUTVOL/bundle.json","state":"https://pith.science/pith/RGMOP2UXLEVFQHS6EV37MUTVOL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RGMOP2UXLEVFQHS6EV37MUTVOL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:RGMOP2UXLEVFQHS6EV37MUTVOL","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"5dd28bb5ac64d3d9c1c54f142802323c602f4c1b372503406aee52454b5c46d6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-05-16T20:00:04Z","title_canon_sha256":"c12df3ec556a05cb326c569310ae444365eab870a07e5abe3de49c8b4c40733c"},"schema_version":"1.0","source":{"id":"1605.04913","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1605.04913","created_at":"2026-05-18T00:49:18Z"},{"alias_kind":"arxiv_version","alias_value":"1605.04913v1","created_at":"2026-05-18T00:49:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.04913","created_at":"2026-05-18T00:49:18Z"},{"alias_kind":"pith_short_12","alias_value":"RGMOP2UXLEVF","created_at":"2026-05-18T12:30:41Z"},{"alias_kind":"pith_short_16","alias_value":"RGMOP2UXLEVFQHS6","created_at":"2026-05-18T12:30:41Z"},{"alias_kind":"pith_short_8","alias_value":"RGMOP2UX","created_at":"2026-05-18T12:30:41Z"}],"graph_snapshots":[{"event_id":"sha256:ef494e5b97e69789671119743ed90afe98e48e9b6f729c63d10628c070d74b16","target":"graph","created_at":"2026-05-18T00:49:18Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"The observed mass-to-light ($M/L$) ratios of a large sample of GCs in M31 show an inverse trend with metallicity compared to what is expected from Simple Stellar Population (SSP) models with an invariant canonical stellar IMF, in the sense that the observed $M/L$ ratios decrease with increasing metallicity. We show that incorporating the effect of dynamical evolution the SSP models with a canonical IMF can not explain the decreasing $M/L$ ratios with increasing metallicity for the M31 GCs. The recently derived top-heavy IMF as a function of metallicity and embedded cluster density is proposed ","authors_text":"Akram Hasani Zonoozi (IASBS), Hosein Haghi (IASBS), Pavel Kroupa (University of Bonn)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-05-16T20:00:04Z","title":"A Possible Solution for the M/L-[Fe/H] Relation of Globular Clusters in M31: A metallicity and density dependent top-heavy IMF"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.04913","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:f54dcab93af132fb78cb470c017993d84ccaa9730e02554a9810604df41fc5a3","target":"record","created_at":"2026-05-18T00:49:18Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"5dd28bb5ac64d3d9c1c54f142802323c602f4c1b372503406aee52454b5c46d6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-05-16T20:00:04Z","title_canon_sha256":"c12df3ec556a05cb326c569310ae444365eab870a07e5abe3de49c8b4c40733c"},"schema_version":"1.0","source":{"id":"1605.04913","kind":"arxiv","version":1}},"canonical_sha256":"8998e7ea97592a581e5e2577f6527572d6923a64f1f6cb044c57169614fcc947","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8998e7ea97592a581e5e2577f6527572d6923a64f1f6cb044c57169614fcc947","first_computed_at":"2026-05-18T00:49:18.647534Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:49:18.647534Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gm/fLGZemZjj0309/eGaAScpN60G6p9yJGyOcBL8hI/CSaud5tjSRxn8km7s3cVerF8kFxEHz+fAa4fKkWY3AQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:49:18.647986Z","signed_message":"canonical_sha256_bytes"},"source_id":"1605.04913","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f54dcab93af132fb78cb470c017993d84ccaa9730e02554a9810604df41fc5a3","sha256:ef494e5b97e69789671119743ed90afe98e48e9b6f729c63d10628c070d74b16"],"state_sha256":"ac41b4bfa2dd722bfb5e5eaaa53d2403859b5b0518c528e88e30a13bd862809a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IsndW4vdTxuXZJQohxeCTn6hJT49Q8wjU8XXZR7PJ+iQs7Pkj718bSg9dfCZAd1Tl/227Ko3/DbTQ6ZCr0aMCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-01T22:36:18.896107Z","bundle_sha256":"d68a6fea2b127497137b16b29f0c0a1f2f54a659c823fcc538b018a8ada04958"}}