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The physical extent of this X-ray emission from Mrk 33 is very similar to the observed Halpha emission, and suggests that the bulk of the X-ray emission is coming from an expanding superbubble.\n  We estimate the age and mass of Mrk 33's starburst to be 5.8 Myr and 6.9 x 10^{6} Msolar respectively with the energy inj"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"astro-ph/0106475","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2001-06-26T17:36:31Z","cross_cats_sorted":[],"title_canon_sha256":"0eea14337e4977c202c27a6f454630a2d220f4dfdc972d6c043c9e34e2531fba","abstract_canon_sha256":"bf56661393cbbd7c2746935c76f3c55f325312ff75cdc1c903a1e5e6ec908bb9"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:40:44.412659Z","signature_b64":"36of8AQuAXi+rFCFv+FSxvL7//4FWknx/4bZwx4laXV59HvHN9mfu80y2Us6W4H+6etVzLXqImWgm7jyh5gtDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f30cc0e759a57a6c22bd117ba0ae86aace2cdb44da4c73cf502ed21cbcf0e34a","last_reissued_at":"2026-05-18T01:40:44.411979Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:40:44.411979Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The Energetics and Mass-loss of Mrk33","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"(2) The Johns Hopkins University), David K. 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